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LCA20 User Manual - Novatech Measurements Ltd

1. Fit jumper link to Vref 1 Link 1 and 2 mV Source Link 5 and 6 Fit the jumper link to the pins marked Vref Measure the Excitation voltage across 1 and 6 on the connector Multiply by the mV V values on the calibration certificate at the required calibration Page 104 LCA20 User Manual 517 182 Revision 1 4 load Set the mV source to these values and perform the automatic calibration as described in the Using the Wired Handheld Programmer section of this manual Remember to Remove the jumper link when finished Vref This Link when fitted biases the load cell input negative signal at 2 5V DC This facilitates easy connection to certain type of barriers This feature is also useful for calibration where an mV signal is injected directly into the Signal inputs See above mV Source Calibration Shunt Calibration The LCA20 is fitted with a 100k ohm resistor which when commanded from a digital input or over the communications port is placed across the Load Cell Negative Input and the Excitation Negative This has the effect of changing the mV V by a fixed amount in the positive direction The change in mV V can be calculated as follows AmV V 1000Rg 4Rs 2Rg Where Rg is the Load Cell impedance And Rs is the Shunt Calibration Resistor impedance Should the 100k resistor not provide enough mV V change you can fit your own resistor to the board To calculate a value for the Shunt Calibration resist
2. LCA20 Load Cell Amplifier User Manual mantracour t com nlf mantracourt Contents ECAZ0 User Manual iia do OVINA SS EA A 5 Backward Compar IDEY il sado toa as ds a Menten tuts idas 5 NEWAFGQLUNES na a AA AA AAA A AA A i 6 How t Use This Mana aiii 7 Using the Wired Handheld Programmer Display ssssssssnsnsnsnnnnnnnnnnnnnnnnnunnnnnunnnnnnnnnnnnnnununnnnnnnnnnnnnnnnnnnn 8 OVIEN Ree O Rane gO RV RO Se TREES A rane eR A 8 keypad and DISPLAY rer kaera ta Dl wee wen Cote cal detues A ae aida wee ah AA zens Sead aw bade Hada eta ia secant 8 LCA Ta Eeoa AMONG isa a ete al a do od e les ate al Ma E e ree MOS 9 No da ciao a Aone inicia necen moons 9 MA SIS SA AS RAS NAS 9 Pass WORO POLEO ne ea 10 MEAT e vee oa elie bash ota Bane 11 Password Level Lust rs A E A A AAA A Elo 11 RESTOS AAA Sle ett OO A retirees Mee A le i Rete REE ety E anit A de ce Reds SE A ell Dees LM eG tLe te Reda Malt D adsl 14 PASS WO Level raid rotar ala beta aE 15 PERZOMDO ui SAS LS NS AAN ARS AAA RAE NA ta 18 IS acess hayes everest tice reek sre esate elec S tenance tytn hence eye dares ee E pe via EEE af nests horace cctaeya tac T 18 MAS o bs ee cb as de a lon ea eas ea 18 PASSWOPG A acct AA A A enh alee aac RAE ac rca esa Bar EA a ORR GA Cae Ao ARNAR EAG 19 Mona TDS nia rodada Goon eR BN 19 AUTO Calor ION accent riera A E STA acts dont dolia ei ao dol dol emi dades 26 o O RS ere ae eee 26 Notes on Autocalibration a A e e e a O a no cae al ad o aan ae 27
3. Inflight Compensates for amount of delivered product still falling even after valves are closed Hysteresis This is used to stop relay chatter and affects the actual point that relay contact changeover occurs Inverted Whether the operation of the relay is inverted Latched Once contacts have changed this option can be used to latch the relays A serial command or digital input is then required to reset the relay contacts Relays only latch in deactivated state Reset Click this button to reset any latched relays See Also Appendix C Relays for more information O In LCA20 mode each relay has an independent Hysteresis value but in LCA15 mode both relays operate from a single Hysteresis value Page 42 LCA20 User Manual 517 182 Revision 1 4 Measurement This page shows how the core measurement values relate to each other LCA Toolkit ann Measurement oe eee ee OR Calibrated Value Help 0 006 544 System Zero This page shows the relationships between different 0 000000 l values in the core measurement system Zero Tracking Tare You can also select the source af various values and adjust system zero Gross Net Tare value can also be adjusted manually here Source Source Source Gross Gross Gross Peak Valley Snap 20 00100 MI 0 001701 MN 0 000000 PM Source Resolution Gross v 0 010000 Display LCD 000 LCA Toolkit LCB20 Module serial number 999999999 set as
4. to write a register pair The start address must always be a valid parameter address which is always an odd number see the following The only permitted data length is two registers i e 4 bytes Registers cannot be read or written singularly in larger groups or using other addresses i e even numbered registers cannot be addressed directly Parameter Addresses See the Software Command Reference table for Modbus register numbers Parameter Values All exchanged values read and write parameters are in the standard IEEE 4 byte floating point format The 32 bits of the number are distributed as follows Page 69 LCA20 User Manual 517 182 Revision 1 4 MSB 31 Sign bit 1mnegate 30 23 Exponent 7 bit excess 127 LSB 22 0 Mantissa 23 bit fraction with implicit 1 The value of the number is thus 1 Si y Exponent 127 1 Mantissa Note the assumed 1 before the mantissa The exception to this is the special value 0 0 which is represented as 4 zeroes So a floating point number of 12345 678 is represented as OxC6h Ox40h OxE6h OxB6h These 32 bits are mapped onto a register pair in the following way The lower register holds bits 15 0 and the upper register bits 31 16 These values are coded according to normal MODBUS conventions so the actual byte sequence ina read write message is thus R1pi Rojo R2bi R2ic Which in terms of bits is 15 8 7 0 31 24 23 16 Error Codes Only Three Modbus
5. Response to Command 1 from LCA20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 A ma a AA Ree A ICA y IV gt yA PY ya I via livia eT we I PPIGHiiWMdi Serial Device Station number Net Value Setpoint 1 InFlight 1 Setpoint 2 Inflight 2 Hysteresis Output Action mV V for Low Calibration Point mV V for High Calibration Point Calibration Low Value La A REVISION MNEVISIOTL L amp 22 23 Calibration High Value 24 25 Auto Tare 26 27 Display Averaging 28 29 Output Low 30 31 Output High 32 33 Decimal Point position 34 35 Serial Device Station number 36 EEPROM Enable Disable flag 37 Relay status 38 XOR checksum of the above data O Most significant byte precedes least significant byte for data sent by LCA20 Command 2 Read Net DATA transmitted to LCA20 for Command 2 OxFFh Serial Device Station number 0x82h Checksum Where Checksum Serial Device Station number XOR with 0x82h Example To obtain the display reading of an LCA20 whose Serial Device Station number is decimal 47 send the following Data OxFFh Ox2Fh Ox82h OxADh Note MS Bit Set Response to Command 2 from LCA20 1 Serial Device Station number 2 3 Net Value 4 XOR checksum of the above data O Most significant byte precedes least significant byte for data sent by LCA20 If when using commands 1 or 2 an error is detected by the LCA20 then it transmits the NAK Not acknowledge character
6. 116 66 OutputHigh 1216 66 Note 1 The output can be inverted by setting Output Low more positive than Output High Page 118 LCA20 User Manual 517 182 Revision 1 4 Note 2 If Output Low or Output High is greater than 19999 then divide both Output Low and Output High by 10 this will give less resolution User Adjustment The LCA20 has no Potentiometers for trimming the 4 20mA and 0 10V outputs as did its predecessor Instead the output can be trimmed digitally using parameters that can adjust both the 4 20mA and the 0 10V outputs for gain and offset This is useful for when the input of the device that the LCA20 is connected to is not accurately calibrated itself or in the case of the voltage output to compensate for small voltage drops in the cabling As an example setting the 4 20mA and 0 10V Gain parameters to 0 5 re scales the analogue outputs to 4 12mA and 0 5V respectively An offset can be introduced by entering a value for 4 20mA and 0 10V Offset parameters with one digit nominally representing 2 03uA and 1 254mV respectively The factory calibration can be re instated by resetting the offsets to 0 and the gains to 1 Output Override The analogue output can be overridden and set to a fixed level by entering a value for Analogue Output Force Counts via serial communications enabling the LCA20 to act as a manual process controller via a suitable interface or isolated current or voltage supply for low power sensors w
7. 6 4 seconds per sample 1 25 samples per second 12 8 seconds per sample 1 6 seconds per sample 25 6 seconds per sample 3 2 seconds per sample Dynamic Digital Low Pass Filter The dynamic filter is a digital low pass filter implemented in software which behaves like an electronic RC circuit It has two user settings a Filter Level set in the calibrated engineering units and the maximum number of steps Filter Steps 1 to 255 To bypass the dynamic filter set Filter Steps to 0 Instead of outputting every new value a fraction of the difference between the new input value and the current filtered value is added to the current filtered value to produce the filtering action If this difference is less than the value set in Filter Level then the fractional amount added each time is decremented until it reaches the minimum level set by Filter Steps i e Filter Steps is the limit of the divisor Example if Filter Steps 4 initially the whole difference between the new value and the current filtered value is added to the current filtered value The next value displayed is the result of adding one half of the difference The following update adds one third while subsequent updates continue to add one quarter of the difference the limit of the divisor having been reached i e 1 Filter Steps 1 4 If Filter Steps were increased to 10 the process would loop for ten times then continue to add just 10 of the difference resulting in a longer set
8. AVA ES Sas GF il f A oe eR 27 Using the LCA TOOIKIt SOMWale cciiinsns trinni reon erann AAAA A LAENA cad 29 What Cam It DO oranan A A A AAA ate A E 29 USING the SOWA Basi aa AA A A AA Mena A A A a A 29 FIOMIC Pad rarer aaa aaa en N ara rav a a ta canas 30 MO Ma Oaa aara naaa a a aaa a aaa aaa a a aaa a a aa aa a a A oa nae oats ares ee ee es A SA 32 SA a a ave a a A A 34 TA E 35 LOGIN A cose teen ee eet iaunae neste E mace iets alin cineten dn ae day es ine tee gate AAN aa E AA uee asia tae ees 36 ANalOGUE OUUDUES 1 ocincutt ts rt ios 39 FR UL Sa NR Sena oe Ge NOE ON 42 Measurement asa iia ok eek ae na UU E eh aaa 43 CO VU CAL ONG keke Buh Re iu alt Sect tate meta re ene E lady ce ala alte Malian dia EE el sie eae ce ds iat E cine A alee eat tL 45 Digital MPU ernia ia iia cand Miao Aaland ld iia dai isa 46 SAU FeO O aria arcs Nt 47 A A oe E E 48 AME eh FE Tarro ata tienes tarados oa Ote 49 Advanced aaa diia taaan tea ea a 50 Spont Calbracion Taurina ds dai a dt ld Se era ea de SUL dde ede ds E dos 51 CI A 52 O A A ee 53 Communications Protocols for Custom Software Data ACQUISITION ssssssssssnsnsnnnsnnnnnnnnnnnnnnnnnnnnnnnnnnnn 54 COMMUNES CON POr eta aid G9 el e atl eo oo te hatha ans E E e a id o ls tales AA 54 POCO COS readers andaban Tern nt ee en ree Orr eee Me Tree tT Te eee cer mee eee ere re 54 Software Command Reference for MantraBus2 Modbus and MantraASCll cccccecccceeeeeeeeeeeeeeeeeeeeeeeeeeeueteueee
9. New data must be received as a string of four nibbles bits 7 4 set to zero which are assembled into two bytes and written into the variables store within the LCA20 The most significant nibble must be received first and the last nibble must have the most significant bit bit 7 set to indicate the end of data This is followed by the checksum The data transmitted from the LCA20 is always sent as complete bytes The station number precedes the data and the checksum follows the data The data format used is signed 15 Bit The most significant bit of the most significant byte is set for negative numbers Operation There are two modes of operation namely data requests by the master controller and parameter writes Data requests from the LCA20 consist of either a complete dump of the data variables stores in RAM or the Net value Parameter writes consist of writing new data to LCA20 variables thus changing parameters such as Setpoints Inflights etc Parameter writes also include action commands such as Latch Relay Reset After a parameter Write an acknowledgement message is returned by the LCA20 to indicate that the new data has been acted upon Writing to Parameters The required parameter to be updated is determined by the command byte which follows the station number An XOR Exclusive OR checksum consisting of the station number command byte and any following data must be appended to the data It is most important that the byte preceding the
10. Usina UNE Caracas star dis o a 106 Appendi B Measurement aT NUS LRG CNW LENG RENE LANG LONG LENG LONG MENG e Chee E eau 107 Page 3 LCA20 User Manual 517 182 Revision 1 4 OC es tr e let naa 107 LO A E O 110 SC Laa o a EA AE Ea a 110 AULO Tae AA RO AA Aa a ees sl ie te anton ea 110 A NR TORNAN RRA 110 OEI WA A AA Ai 110 SIMPE BOCK AVE TAO nta tdci ea 111 DNA me DOntal LOW PoS Elia Dt sandra aaa 111 Feakand Valey Vig Sd dad 113 SAP COMMON 114 APPendIXC Rela Si Ran idos 115 ONIS ao odio tad NE ean na oneness te 115 SUCIA AAA AAA ASA A AAN 115 O A evant te ie acs ae dean Tees ead AN 115 O sa caenie sah oom Gaanmnse rea T dn ent emaenataamLealhnil aeMaadsawmea den awkaene 116 O ere eee Prep R ene rate hee ener eee R et ern herr rece Ter nr AR RA 116 IVETE nai a cert hy A EA 116 HEAT TC O A RRA REA AE 116 Appendix D Analogue QUIPUE iria 117 OM el gall aa ASS ida Ter Rene SA CI 117 SOUC E RO 117 SE INE PEIEE AE ev sh desea A E E E ed ae E E A E A E E T 117 US AUMENTA A a a a e a a yen AR 119 OUTPUT OW CICS este a e at dea tl aie Maitre sd e ed ll eee o 119 Appendix E Digital INDUtS iia dais 120 OV ORV IEW stenteriaarasonaG E T E anne abana ean aap ately Nae ta dace IA Aenea Tal bao Maa E aaa E A Cormeen 120 Dita MPU Selecon ADCs ae class A A A A Wace aah ate eek Rea ae TAC gad a AD AAA i 120 Appendix F Security LOCKING ai A eee 121 Menu Seco es Cee eee eee ern en ee A eee eee err ree soda 121 Fancheld Display CDr On OG isa a a
11. scaling Note that the chart will stop updating if you switch to another page Version 0 0 25 Pause Button Pauses the chart During a pause no more data will be added to the chart You can use the range scrollbar to change the view or click and drag on the chart to move the cursor The time and value of the data under the cursor will be displayed under the chart Range Scrollbar By dragging the orange thumb you can view different areas of the data history By dragging the left or right side of the thumb you can increase or decrease the amount of data shown thus zoom in and out Right Click Menu Right clicking the chart will display a pop up menu with three options Copy Chart Image Copy a bitmap image of the chart to the clipboard Copy Chart Data Copy tab separated chart data to the clipboard in a suitable format for pasting into MS Excel Clear Chart Clear all data from the chart LCA20 User Manual Revision 1 4 oy Logging D The toolkit allows you to log data to a CSV Comma Separated Value file This file can be opened for analysis in various applications including MS Excel The logging session can be manually controlled or automatically stopped after a duration number of logs limit LCA Toolkit o Logging ADO A OR Duration Interval Help Log Interval ms Select Here you can log the data to a 1000 000 1 log per second Manual control E E Number of Logs Hours Mins file which may el
12. 517 182 Revision 1 4 LCA20 User Manual Overview The LCA20 In Line Intelligent Strain Gauge Amplifier is a compact microprocessor based unit specifically designed to control and monitor weighing applications Its flexibility of design allows for the connection of most load cells and pressure or strain gauges over a wide range of sensitivities Housed in a light grey ABS case it is sealed to IP65 standard to meet most environmental conditions The LCA20 s predecessor the LCA15 was designed in 1992 with over 10 000 units being sold It has obtained a well earned reputation for being a reliable easy to use and adaptable instrument The LCA15 has been redesigned as the LCA20 to take advantage of technology that leads to improved performance increased functionality and the ability to maintain the selling price The basic unit offers the following facilities A simple auto calibration of the highest and lowest weights required an easy auto tare setting and a peak hold and valley facility A menu password protects the configuration parameters DC analogue outputs of 4 20mA and 0 10V are standard with full scaling over any desired range and the ability to invert these outputs If required Gain sensitivity is available in two ranges 0 5 to 3 7mV V and 3 7 to 7 8mV V Several plug in options are available A relay module offers two switched set points which can be inverted and or latched Hysteresis can be applied to both set points tog
13. EEPROM commands EEPROM commands are for backwards compatibility with LCA15 which had limited EEPROM write cycles The LCA20 does not have this limitation and therefore EEPROM disabling is relevant only if an increase of speed of required or it is desirable that the LCA20 hold a set of known power up values When data is written to parameters the data Is first entered into the RAM which is volatile memory contents not saved through power cycle if the EEPROM is not disabled then the data is also written into EEPROM which is the permanent non volatile memory This EEPROM memory has a limited number of write cycles and also requires time to write to In systems where writes to parameters may be very high or speed of operation in terms of how long it takes to write data to memory and get an ACK or NAK returned from the LCA20 so the master can process the next read or write then it is possible to disable the EEPROM memory O If the EEPROM is disabled it is important to note that the next time the LCA20 is power cycled the LCA20 will revert to the last values that were stored in EEPROM and not the last values written by the communications port or from the keypad EEPROM disable is achieved by writing 0x100h using command 19 In this state all writing to EEPROM is inhibited Example To disable the EEPROM whose Serial Device Station number Is set to decimal 47 The data transmitted by the master would be OxFFh Ox2Fh 0x13h 0x00h Ox01h
14. Format Drop down the list and select a display format for this software only This does not change any module settings More Clicking this button displays more information as shown in the following screenshot Page 32 LCA20 User Manual 517 182 Revision 1 4 W LCA Toolkit aa Information 9 cL WM OR Help Here you can view information about Mule This shows the reading and any errors relating to the input The format button allows you to format the value displayed and kg does no Serial Number Firmware Version Update Rate Select display format 0999999999 02 0 80 samples per second 0 0000 Display Source Mode Gross LCA15 Relay 1 State Relay 2 State Digital Input 1 Digital Input 2 Digital Input 3 Shunt Calibration State Less LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 39 Relay 1 State Indicates whether relay 1 is on or off Relay 2 State Indicates whether relay 2 is on or off Digital Input 1 Indicates whether digital input 1 is activated or not Digital Input 2 Indicates whether digital input 2 is activated or not Digital Input 3 Indicates whether digital input 3 is activated or not Shunt Calibration State Allow the shunt calibration function to be activated Less Clicking this button hides this extra information again See Also Appendix A Calibration Shunt Calibration Page 33 LCA20 User Manual 517 182 Revision 1 4 kd Save
15. Point 1 Calibration Point 2 Calibration Point 3 Calibration Point 4 Calibration Point 5 Calibration Point 6 Calibration Point 7 Calibration Point 8 Calibration Point 9 Calibration Point 1 Calibration Point 2 Calibration Point 3 Calibration Point 4 Calibration Point 5 Calibration Point 6 Calibration Point 7 Calibration Point 8 Calibration Point 9 Calibration Point 1 Calibration Point 2 Calibration Point 3 Calibration Point 4 Calibration Point 5 mV V mV V mV V mV V mV V mV V mV V mV V mV V Gain Gain Gain Gain Gain Gain Gain Gain Gain Offset Offset Offset Offset Offset Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write SP2 IF2 HYS OA CALL CALH AT DA OPL OPH DP CP SDST LN RS ADCL ADCH SENS RATE CALP CMV1 CMV2 CMV3 CMV4 CMV5 CMV6 CMV7 CMV8 CMV9 CGA1 CGA2 CGA3 CGA4 CGA5 CGA6 CGA7 CGA8 CGAY COF1 COF2 COF3 COF4 COF5 23 24 25 26 21 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 4
16. Set the fractional part of the difference between the newest and previous values that is added to the previous value to generate the next gross i e if filter steps is 10 then only a 10 of the change is applied to the gross value Update Rate This indicates the samples per second or rate at which new values are generated 3db Down Point When using the digital low pass filter there is an attenuation of higher frequency components on the input signal This indicates the frequency at which the output value would be half of what it would be at a fixed level See Also Appendix B Measurement Filters for more information Page 53 LCA20 User Manual 517 182 Revision 1 4 Communications Protocols for Custom Software Data Acquisition If you intend to communicate with the LCA20 with custom software or to connect the module to a PLC or existing data collection system this section explains the various protocols available Communication Port All Protocols use the serial settings which define the way the serial data is encoded These are fixed and cannot be changed e One start bit e One stop bit e 8 data bits e No parity Bus flow control is managed as part of the protocol managed differently by each No hardware or software flow control signals are to be used for any of the bus standards Protocols The LCA20 supports a number of serial communications protocols and are explained below All protocols except when in printer mode h
17. Write Commands Commands 3 To 18 Write Parameter to LCA20 Format for data transmitted to LCA20 for Commands 3 to 18 Page 61 LCA20 User Manual 517 182 Revision 1 4 OxFFh Serial Device Station number Command No MSN NMSN NLSN LSN Checksum Where MSN Most significant nibble of data NMSN Next most significant nibble of data NLSN Next least significant nibble of data LSN Least significant nibble of data with MSBIT set Checksum The following are XOR d with each other Serial Device Station number Command number MSN NMSN NLSN LSN with MSBIT set Example To change SP1 to 200 0 whose Serial Device Station number is decimal 47 The following data is sent Please note the following points apply The decimal point is ignored i e 200 0 equals 2000 digits 2000 decimal is Ox07DOh The data is sent in Hex nibbles so 2000 0x00h Ox07h Ox0Dh 0x00h The data transmitted by the master would be OxFFh 0x02Fh Ox03h 0x00h Ox07h Ox0Dh Ox80h OxA6 Note MSBIT set Response to Write Commands If the data has been accepted by the LCA20 then the following acknowledgement string is transmitted by the LCA20 Serial Device Station number 0Ox06h ASCII ACK character If there are any errors with the data received by the LCA20 then the following Not Acknowledgement NAK string is transmitted by the LCA20 Serial Device Station number 0x15h ASCII NAK character Page 62 LCA20 User Manual 517 182 Revision 1 4
18. amp Restore This page allows the configuration of the module to be saved to a file for later restoration LCA Toolkit Save amp Restore a xg so i INS Query the device for its parameters and save these to a configuration file on your computer or network location Save Load a previously saved configuration file into the currently connected device NOTE As all parameters are restored you will overwrite the existing device calibration This file may then be used to information the configuration to Restore dute or to configuration onto anothe If you have a Firmware Update file you can update the firmware in the connected module to update it to a newer version The PGM1 programming cable must be used This is considered an advanced function and should be used with caution a failed attempt ata firmware update will render the module inoperable until a successful update has completed Firmware Update LCA Toolkit LCA20 Module serial number 999999999 set as station 253 on COM2 Version 1 0 1 Save Save the module configuration to a file on the computer Restore Restore a previously saved configuration file to the connected module Firmware Update If you have a firmware hex file you can click this to select the file and update the firmware in the module Do not use LC4 communications port to update firmware PGM1 Programming cable must be used when updating firmware Warning A failed attem
19. button will stop the log View When a log has just been stopped this button will launch the application associated with CSV files The format of the log file is as follows DateTime Elapsed Value Where DateTime is the date and time in long format Elapsed is the time elapsed in milliseconds since the start of the log Value is the numeric value logged Example 08 06 2009 15 41 08 0 3 253001E 03 08 06 2009 15 41 08 10 3 253001E 03 08 06 2009 15 41 08 43 3 253001E 03 08 06 2009 15 41 08 60 3 253001E 03 If the measurement rate of the module is less than the rate at which you have chosen to log you will be informed with a message as shown below Either reduce the Log Interval or reduce the Measurement Rate If you are using a serial USB convertor there may be some driver settings that can affect the speed of logging See chapter for information that may be relevant Page 37 LCA20 User Manual 517 182 Revision 1 4 LCA Toolkit Logging Log Interval ms Select 83 33 logs per second Number of Logs Hours Mins Log Filename C Users matt MANTRACOURT Documents LCA Toolkit LCA 1 csv You have chosen to log at a rate of 83 33 logs per second but the measurement rate of the module is set to 80 updates per second Because the module produces new readings slower than the rate at which you want to log the logged data will contain multiple readings of the same value To ensure multiple identical readings are
20. checksum must have its most significant bit set to signify the end of data The LCA20 calculates its own checksum from the data it has received and if it disagrees with the received one a NAK not acknowledge character is returned Command Table The following is the list of commands available for reading from or writing to the LCA20 Dec Hex 1 Ox01h Request all parameters includes Net Value 2 0x02h Request Net Value 3 0x03h Write Setpoint 1 4 0x04h Write InFlight 1 5 0x05h Write Setpoint 2 6 0x06h Write InFlight 2 Page 59 LCA20 User Manual 517 182 Revision 1 4 Command 1 Read All 0x07h 0x08h 0x09h Ox0Ah OxOBh Ox0Ch Ox0Dh Ox0Eh Ox0Fh 0x10h 0x11h 0x12h 0x13h 0x14h 0x15h 0x16h Write Hystersis Write Output Action Write mV V for Low Calibration Point Write mV V for High Calibration Point Write Calibration Low Value Write Calibration High Value Write Auto Tare Write Display Averaging Write Output Low Write Output High Write Decimal Point position Write Communication Protocol Write EEPROM Enable Disable flag Do Relay Reset Do Auto Tare Do Peak Valley Reset Data transmitted to LCA20 for command 1 OxFFh Serial Device Station number 0x81h Checksum Where Checksum Serial Device Station number XOR with 0x81h Example To obtain a complete dump of the variables in the LCA20 whose Station Number is decimal 47 send the following Data OxFFh Ox2Fh Ox81h OxAEh Note MS Bit Set
21. has not changed on the load cells the display will now be showing the required values Notes on Auto calibration e f CALH is set to zero then the display value will be mV V with decimal point position being that set by dP e CALL can be greater than CALH This will have the effect of for an increasing load cell input a decreasing displayed value e The calibration can be manually adjusted by changing the mV V values stored in AdCL and AdCH Care must be taken with changing these values and the resolution of entry is limited to 0 001mV V MVV Source Calibration If the load cell manufacturer s calibration certificate is available a quality mV source connected as shown below can be used to calibrate the LCA20 instead of applying the known High and Low calibration weights in the above procedure This can be useful if it is not practical to load or unload the system for calibration Page 27 LCA20 User Manual 517 182 Revision 1 4 Vref Fit jumper link to Vref Fit the jumper link to the pins marked Vref See diagram above Measure and record the excitation voltage across 1 and 6 on the connector Multiply excitation voltage recorded by the mV V values on the calibration certificate at the required calibration load Two mV values are required one for CALL and for CALH Now perform the above Auto Calibration procedure setting the mV source to these values at steps 1 and 8 Remember to remove the Vref jumper link before
22. not logged enter 13 milliseconds Log Interval Not Logging LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Help Here you can log the data toa CSV comma separated value file which may be later opened in MS Excel for example The data is recorded as follows Date Elapsed ms Value Some log rates may not be achievable depending on PC speed and how busy the PC is When logging you will be shown the actual log rate being achieved Version 0 0 39 Once the logging starts the actual achieved log rate will be displayed at the bottom of the window This is useful for diagnostics such as when a heavily burdened PC is slowing the log rate WS LCA Toolkit Logging Interval Duration Log Interval ms Select 1 log per second Number of Logs Log Filename C Users matt MANTRACOURT Documents LCA Toolkit LCA 1 csv st Logging at 1 000Hz to C Users matt MANTRACOURT Documents LCA Toolkit LCA 1 csv and achieving 1 000Hz Log count 4 out of 100 LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 LCA20 User Manual 517 182 Help Here you can log the data toa CSV comma separated value file which may be later opened in MS Excel for example The data is recorded as follows Date Elapsed ms Value Some log rates may not be achievable depending on PC speed and how busy the PC is When logging you will be shown the actual log rate being achieved V
23. once configured you connect to It using your own software In this case two sections are relevant Where these sections refer to complex operations or subjects you will find the detailed information in the Appendices These can be viewed as required and are independent of the methods you use to configure or communicate with the module Page 7 LCA20 User Manual 517 182 Revision 1 4 Using the Wired Handheld Programmer Display Overview The LCA20 can be operated in two modes LCA15 which is the legacy mode which gives a simple linear menu system or LCA20 mode which has a multi level menu system Both modes have 3 password levels and depending on what password has been entered alters what can be accessed the higher the level of password the more parameters can be accessed The keypad and menu system operates for the two different modes and these are described in the next sections of this manual Keypad and Display The Programmer Unit Is a small hand held unit together with a 2 metre connection lead known as LP2 which plugs into a FFC68 socket on the main assembly board There is also an option for a permanent field programmer fitted internally which is known as LP1 All user controls displays and indicators are mounted on the front panel which comprises a 4 5 digit LCD display and four flush mounted keys A flashing symbol in the top left hand corner of the display indicates programming mode This symbol is also used to indica
24. opened or Date Elapsed ms Value Log Filename C Users matt MANTRACOURT Documents LCA Toolkit LCA 1 csv amp Some log rates may not be achievable depending on PC usy the PC is Start Not Logging ES LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 39 Interval Log Interval Choose a Log Interval in milliseconds between 12 and 32000 For example 20mS will enable a log at 50Hz Duration Select Choose whether you want Manual control so you can click the Start Stop button whenever you want or choose Based on number of logs or Based on timed duration If you choose either of the last two options you can define the length of the log by entering either a number of logs to record or the time to record in hours minutes and seconds Number of Logs if you choose Based on number of logs then you can enter the number of logs here The hours minutes and seconds will update to show the actual duration based on the number of logs and the log interval Hours Minutes Seconds if you choose Based on timed duration then you can choose the hours minutes and seconds here The number of logs will update based on the duration and the log interval Page 36 LCA20 User Manual 517 182 Revision 1 4 Log Filename Select a file to log to O Each time the log starts it will erase any data already in the file Start Clicking this button will start the log Stop Clicking this
25. rAtE 10S Measurement rate as Samples per Second 10S 10 samples per second 80S 80 samples per second AdCL 8 0000 mV V Value captured for low calibration point CALL AdCH 8 0000 mV V Value captured for high calibration point CALH ZEro 19999 0000 System Zero Value AOPS 4 20 or 0 10 4 20 Selects Analogue Output current or voltage ddiS nEt Selects Defaults display type nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value Menu items from Password 1 follow on from this menu Page 14 LCA20 User Manual 517 182 Revision 1 4 Password Level 3 Password level three gives access to the parameters associated with the Analogue Output Relays and Digital Input options dIP1 Prnt At Lr Prnt dEFt GroS nEt PEAK VALY SNAP PV r SCon SCoF SCtG dSnP diP2 Latch Relay Reset At Lr Prnt dEFt GroS nEt PEAK VALY SNAP PV r SCon SCoF SCtG dSnP tes Digital Input 1 function Perform Tare Latch Relay Reset Do Print Display Default display set by ddiS Display Gross value Display Net value Display Peak value Display Valley value Display Snap Held value Peak amp Valley Reset Shunt Cal On Shunt Cal Off Shunt Cal Toggle on off Do Snap Hold current value Digital Input 2 function Perform Tare Latch Relay Reset Do Print Display Default display set by ddiS Display Gross value Display Net value Display Peak value Display Valley value Displ
26. relay goes off and comes on again when the input rises to the Setpoint plus the Hysteresis value For LCA15 mode Hysteresis will be applied to both Setpoint values It is effective for both normal and Inverted action Inversion A normal non inverted relay is defined as being in the energised state when the source value Is below the resultant setpoint An inverted relay is defined as being in the energised state when the source value is above the resultant setpoint Note the LED s fitted to the LR1 denote whether a relay is energised or de energised The LED is ON for an energised relay Latching The latching facility allows the relay module output to be held until reset externally via the digital input or via the communications port Latching is applied to the off status of the relay Latched relays are reset by operating a closing contact connected between LR terminal and 0 volts on the field terminals this assumes that Digital Input 2 is set to its default function LR See Also Appendix E Digital Inputs for more information Page 116 LCA20 User Manual 517 182 Revision 1 4 Appendix D Analogue Output Overview Two analogue outputs are available offering a DC current range 4 to 20mA and a DC voltage range 0 to 10V They are fully scalable optically isolated and both generated from a single selected variable see source below Both outputs are pre calibrated to an accuracy of 0 15 FR and have a r
27. station 253 on COM2 Version 0 0 33 Calibrated Value Shows the calibrated value Calibration turns the input mV V value into this value System Zero Enter a value here that is added to the Calibrated Value to produce the Gross value System Zero is used to remove permanent values from an installed system such as the weight of a vessel or weighing platform to give a zero Gross value Zero Tracking Zero tracking is applied after the system zero and compensates for small changes in the input to allow for a zero Gross value See Appendix B Zero Tracking for more information Gross The Gross value of the system Net The Net value of the system is generated from the Gross value plus the Tare value Tare The Tare value is added to the Gross value to generate the Net value Peak Indicates the highest value measured since power up or last Peak Valley Reset Peak Source Select which source the peak value is based on Valley Indicates the lowest value measured since power up or last Peak Valley Reset Valley Source Select which source the valley value is based on Reset Button Reset the peak and valley values to the current source value Snap Shows the last snap value recorded Snap Source Select which source the snap value is based on Page 43 LCA20 User Manual 517 182 Revision 1 4 Snap Button Perform a snap recording now This control is included for demonstrating the function and has limited use for a single m
28. 0 when shunt calibration is activated and the integrity of the calibration and hardware is correct Page 51 LCA20 User Manual 517 182 Revision 1 4 Cal Info Tab This tab shows the last date the Toolkit was used to perform calibration and shows the Calibration Counter parameter that the module increments whenever a calibration related parameter is written to E LCA Toolkit e Calibration E OL AA MOR Input Sensitivity Decimal Point Mode Help 0 5 to 3 7 mV V 19 9 v LCA15 Legacy ET calibrate the module Cal Info hieved by Shows the stored last calibration date and calibration counters If these parameters have not changed then the calibration of the device has not changed Last Calibrated Date By LCA Toolkit 06 May 2014 Calibration Counter 125 mvV V Input Calibrated Value Underrange Value Overrange Value Units 10 00000 Im 35 00000 MM 1 999434 M 25 59107 LCA Toolkit LCA20 Module serial number 999999999 set as station 253 on COM2 Version 1 0 2 Last Calibrated Date Indicates the last date that calibration was performed by the Toolkit Calibration Counter Shows the internal calibration counter Page 52 LCA20 User Manual 517 182 Revision 1 4 Filters This page allows the selection of filter settings that are applied to generate the Gross value E LCA Toolkit pinin Filtering CDOT A MOR Rate Help ge allows you to A D Measurement Rate Samples Per Second allows you Filtering Choose eith
29. 025 1000 to 1000 517 182 No 1 0 1 0 0 Invert Analogue output Note this can also be achieved by using OPL greater than OPH Yes Inverted analogue output No Normal analogue output Adjustment of Analogue output values Menu User adjustment for 4 20mA gain Replace function of the LCA15 gain potentiometer Unit gain 1 0 User adjustment for 4 20mA offset Replace function of the LCA15 offset potentiometer Note the value is in PWM counts not mA User adjustment for 0 10V gain Replace function of the gain LCA15 potentiometer Unit gain 1 0 User adjustment for 0 10V offset Replace function of the LCA15 offset potentiometer Note the value is in PWM counts not V Page 21 Revision 1 4 diSP dA dP rs ddiS PEAK VALY Display parameters Menu 0000 Display Averaging Number of reading to block average Resultant samples per second dependant on rATE setting If rATE is set to 10 samples per second NA OF PWN FE O 2 5 samples per second 1 25 samples per second 1 6 seconds per sample 3 2 seconds per sample 6 4 seconds per sample 12 8 seconds per sample 25 6 seconds per sample 10 samples per second If rATE is set to 80 samples per second 0 20 samples per second 1 10 samples per second 2 5 samples per second 3 2 5 samples per second 4 1 25 samples per second 5 1 6 seconds per sample 6 3 2 seconds per sample 7 80 samples per second 0 5 0002 Decimal point position 0 19999 0000 Display Resolu
30. 05 FS this allows table entry of calibration data straight from a load cell test certificate bringing it in line with other Mantracourt instruments An advantage of a factory calibration is that units can be swapped in the field by copying across the calibration from one unit to another with calibration accuracy maintained at 0 05 FS The LCA15 has a variant known as LCA15F This is an LCA15 with a Fast 100 Samples per seconds SPS measurement rate LCA20 has two speeds of measurement 10SPS and 80SPS so now the new version can be used in more dynamic applications requiring only one module to be stocked Page 6 LCA20 User Manual 517 182 Revision 1 4 How to Use This Manual There are three ways you may want to use the LCA20 and this manual has been arranged to best allow the information required to be presented without having to read irrelevant information The three ways to interact with the LCA20 are as follows e Handheld programmer display e LCA Toolkit software e Writing your own communications software It may be that only one of the above methods is used or it may be possible that you will need to refer to more than one section For example you may use the LCA20 in LCA15 compatibility mode and configure and calibrate the module using the handheld programmer display then use the analogue output functionality You would not need the other sections However you may use the LCA20 Toolkit to configure and calibrate the module but
31. 0x00h 0x80h OxBDh The EEPROM can be re enabled in two ways By writing Ox200h via command 19 This writes the current contents of the parameters stored in the RAM into the EEPROM To re enable the EEPROM and update it with the new RAM data whose Serial Device Station number is set to decimal 47 The data transmitted by the master would be OxFFh Ox2Fh 0x13h 0x00h 0x02h 0x00h 0x80h OxBEh By writing 0x400h via command 19 This updates the parameters stored in RAM from the current contents of the EEPROM To re enable the EEPROM and update the RAM with the old EEPROM constants whose Serial Device Station number is set to decimal 47 The data transmitted by the master would be Page 63 LCA20 User Manual 517 182 Revision 1 4 OxFFh Ox2Fh 0x13x 0x00h 0x04h 0x00h Ox80h OxB8 For response to these EEPROM commands see Response to Command 3 to 22 above Write Commands That Perform Actions There are a number of commands that perform actions These are similar to writing to parameters but do not necessarily have to contain data Command 20 Output Relay Reset DATA transmitted to LCA20 for Command 20 OxFFh Serial Device Station number 0x94h Checksum Where Checksum Serial Device Station number XOR with 0x94h Example To output a relay reset to an LCA20 whose Serial Device Station number is set to decimal 47 The data transmitted by the master would be OxFFh Ox2Fh 0x94h OxBBh Note MS BIT SET For response by LCA20 see Respo
32. 1 Stop bits Flow control Mone Bvanced Bestore Defaults COM Port Number USS Transfer Sizes Select lower settings to correct performance problems at low baud rates Receive Bytes 4096 zj Transmit Bytes 4096 m BM Options Miscelaneous Options Select lower settings to correct response problems Serial Enumerator Serial Pri Latency Timer msec Cancel If Power OFF Event On Surprise Removal Minimum Read Timeout msec Set RTs On Close Minimum Write Timeout msec z a Disable Modem Ctrl At Startup You need to ensure that the Latency Timer setting is set to 1 Page 99 LCA20 User Manual 517 182 Revision 1 4 Serial USB Convertors If your computer does not have an RS232 or RS485 port built in you may opt to use a serial USB convertor These convertors plug into a USB port and create a virtual COM port so that the software has a serial port RS232 or RS485 to connect to This section describes the connection of an Easysync ES U 3001 M convertor W LODE M1 53 m a LA lt Oo I ers 9 tft ri RS232 ON Set the SW DIP switches as follows The LCA20 is connected to the 9 way D plug as follows 2 In RXD Receive Data 3 Out TXD Transmit Data 5 Ground GND oO a D L u a a ft oo RS485 ON Set the SW DIP switches as The LCA20 can be connected to either the 9 way D plug or the 6 way screw terminals 9 Way D Pl
33. 1 SP1 IF1 SP2 IF2 HYS OA CALL CALH At dA OPL OPH dP CP SdSt bAUd LAB Ln rs Password Level 2 FStP FLVL SEnS rAtE ADCL ADCH ZEro AOPS ddiS Password Level 3 dIP1 dIP2 dIP3 RLS1 RLS2 ANOP 4 20G 4 200 0 10G 0 100 OVrV undV tYPE Page 129 LCA20 User Manual 517 182 Revision 1 4 LCA20 Product Product Code Serial No Tag No Date Location Measurement type range amp engineering units Calibration Date Calibration Interval PASS tYPE VALS GroS nEt PEAK VALY SNAP mVV CALV rLYS rLY1 SP1 IF1 HYS1 InV1 Ltcl rLS1 rLY2 SP2 IF2 HYS2 InV2 Ltc2 rLS2 AnOP OPL OPH AnOP AoPS InV IA llana Rom cen c17 10 LCA20 User Manual 517 182 1 V UCI Manual JLI LUE r L N O Adj 4 20G 4 200 0 10G 0 100 diSP dA dP rs ddiS PEAk VALY SNAP OVrV UndV LCiP FSTP FLVL SEnS rATE ACAL AdCL AdCH CALL CALH AT trbd ZEro SErL CP SdSt bAud LAb Ln diPS diP1 diP2 dIP3 LCA20 User Manual 517 182 Page 131 Revision 1 4 Warranty All LCA products from Mantracourt Electronics Ltd Mantracourt are warranted against defective material and workmanship for a period of three 3 years from the date of dispatch If the Mantracourt product you purchase appears to have a defect in material or workmanship or falls during normal use within the period please contact your Distributor who will assist you in resolving the problem I
34. 182 Revision 1 4 Modbus MODBUS is selected by setting the Communications Protocol equal to 132 MODBUS is a proprietary standard of Modicom Inc The full specification is quite complex including a timeout based framing strategy and polynomial CRC calculation so full details are not given here Refer to Modicom documentation Knowledge of the MODBUS protocol is therefore assumed The MODBUS protocol is a partial implementation of the RTU binary form of the MODBUS standard sufficient to allow LCA20 units to coexist on a serial bus with other MODBUS compliant devices O Third party applications for MODBUS communications are readily available e g ModScan from Win Tech software www win tech com who offer a free trial version Modbus Messages All messages and responses are formatted with a checksum according to the normal RTU rules The slave number is the Serial Device Station number Slave 0 may also be used for broadcast writes The device command set is mapped into the MODBUS Output or Holding Registers Parameters read or write are mapped onto a pair of registers containing a 4 byte floating point value Action Commands are implemented as dummy parameters Writing activates the command and reading returns a dummy value with no action Only Two Valid Message Function Codes Are Supported Function 03 Read Holding Registers to read a register pair Function 16 Preset Multiple Registers
35. 4 45 46 47 48 49 50 51 52 53 54 59 56 57 58 59 60 61 62 63 64 65 40047 40049 40051 40053 40055 40057 40059 40061 40063 40065 40067 40069 40071 40073 40075 40077 40079 40081 40083 40085 40087 40089 40091 40093 40095 40097 40099 40101 40103 40105 40107 40109 40111 40113 40115 40117 40119 40121 40123 40125 40127 40129 40131 Calibration Point 6 Offset Calibration Point 7 Offset Calibration Point 8 Offset Calibration Point 9 Offset Select Analogue Output Range 4 20mA User Gain 4 20mA User Offset 0 10V User Gain 0 10V User Offset Baud Rate Label Not yet implemented Status of EEROM enable disable Digital Input 1 function Digital Input 2 function Digital Input 3 function Filter Steps Filter Level Default Display Relay 1 Source Relay 2 Source Analogue Output Source Hysteresis Relay 2 Over range Level Under range Level Peak Valley Source Selection Shunt Cal Scaling Factor Zero Tracking Band User Storage 1 Toolkit Units User Storage 2 Toolkit Units User Storage 3 Toolkit Units User Storage 4 Toolkit Cal Date User Storage 5 Toolkit Lock out User Storage 6 Reset Zero tare Latched Relay Reset Snap Reset Peak valley Shunt Calibration On Shunt Calibration Off Disable the EEPROM Enable the EEPROM to RAM Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Wri
36. 7 182 Revision 1 4 Shunt Calibration Tab This tab allows the calibrating of the shunt calibration function After a load cell has been connected to the module and all wiring and connectors have been finalised the Shunt Calibration can be calibrated so that the Shunt Calibration output always indicates 100 00 if nothing has changed on the load cell or wiring This value will indicate 100 0 regardless of the weight on the load cell at the time the shunt calibration is activated This allows very quick checking of calibration and hardware integrity LCA Toolkit ine Calibration a MS MEROE Input Sensitivity Decimal Point Mode Help 0 5 to 3 6 mV V 19 999 v LCA20 v This page allows you to calibrate the module Automatic Table Advanced Eunate Cal Info Shunt calibration will display a fixed value of 100 00 when shunt calibration is activated To do this the module needs to be calibrated to the attached loadcell Calibrate Shunt Calibration State Shunt Calibration Value mV V Input Calibrated Value Underrange Value Overrange Value 0 650541 1 0 981553 LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 25 Calibrate Click this button to calibrate the shunt to the current load cell attached Shunt Calibration State Allows the control of switching on or off the shunt calibration Shunt Calibration Value This is the special shunt calibration value that should read 100
37. 85 ms Zero Stability 0 005 0 01 YF S C Gain Stability 0 005 0 01 YF S C Resolution 1 8000 13 Resolution Bits Isolation 130V RMS or DC to any other port Above specification is based on a Measurement Rate of 80 samples per second and no averaging or filtering li OR A Ea le NM pe mn E 7 7 Q D AN ei Ma YN 1 A LCA20 User Manual 517 182 Revision 1 4 Power Supply LS1 LS3 LS1 Supply Voltage 230V AC 210 260 V AC LS1 Supply Voltage 110V AC 97 120 V AC LSI Power 10 W LS3 Supply Voltage DC Isolated 9 32 V DC LS3 Power 10 W Relays LR1 LR1 Contact Type 2 X SPCO LR1 Contact Rating 240V AC 5A Communications LC4 Data Transmission Rate 2400 115200 bps Isolation 130V RMS or DC to any other port Supported Interfaces RS232 RS422 RS485 2 wire RS485 4 wire Environmental Operating temperature range 10 50 ne Storage temperature 20 0 2e Humidity 0 95 RH Protection LCB20 IPO Protection LCA20 IP65 Protection LSS IP65 Protection LDC IP65 Regulatory CE Approvals European EMC Directive 2004 108 EC BS EN 61326 1 2006 BS EN 61326 2 3 2006 Low Voltage Directive 2006 95 EC BS EN 61010 1 2001 Rated for Basic Insulation Normal Condition Pollution Degree 2 Permanently Connected Insulation Category III ICAIN lear Mania E17_10 gt Davicinn 1 J LCA20 User Manual 517 182 Revision 1 4 Troubleshooting This chapter is designed to assist in the identification of problems relatin
38. A D Measurement Rate is set to 80 samples per second 12 5ms period and Filter Steps is set to 30 then the time taken to reach a percentage of the step change value is as follows Of Final Value Time To settle 63 0 0125 x 30 0 375 seconds 99 0 0125 x 30 x 5 1 875 seconds 99 9 0 0125 x 30 x 7 2 625 seconds Frequency Response For a sinusoidal input the 3dB point i e the frequency where the output is 0 71 of the input is given by Frequency gt 1 Filter Steps 6 3 To calculate the number of steps for a 3dB frequency point use Filter Steps baleen Frequency x 6 3 Page 112 LCA20 User Manual 517 182 Revision 1 4 Peak and Valley Values The LCA20 incorporates a Peak Valley function which continuously monitors the Gross or Net value selected by the Peak and Valley Selection Parameter and stores the minimum valley and maximum peak values These values are volatile and reset on power up Peak and Valley values can be used as the default display value analogue output and relay source values That is to say the display can be set to show Peak value Relay 1 source value could be Peak Relay 2 could be Valley and the analogue output source value also set for Peak Peak and Valley values can also be selected to view by using the digital inputs For example Digital input 1 could be used to display Gross value Digital input 2 to display Peak value and digital input 3 to display Valley value Peak and Valley values c
39. A20 User Manual 517 182 Revision 1 4 Menu Tables Password Level 1 PASS 1111 SP1 19999 IF1 19999 SP2 19999 IF2 19999 HYS 0 19999 OA 0 31 CALL 19999 CALH 19999 At 19999 0000 0000 0000 0000 0000 0000 0000 0000 0000 LCA20 User Manual 517 182 Security Password Correct value required to proceed further Desired Set Point trip value for Relay 1 In Flight compensation for SP1 Relay 1 operates at SP1 IF1 Desired Set Point trip value for Relay 2 In Flight compensation for SP2 Relay 2 operates at SP2 IF2 Hysteresis amount applied to SP1 and SP2 Output Action The value of OA to be entered is the algebraic sum of the following components 1 SP1 Inverted 2 SP2 Inverted 4 AN OP Inverted 8 SP1 Latched 16 SP2 Latched Example 1 If SP1 needs to be latched and inverted and the analogue output is normal enter 8 1 9 Calibration Low display value for low calibration point Calibration High display value for High calibration point Auto Tare value Value added to Gross to give Net Page 11 Revision 1 4 dA 0000 Display Averaging Number of reading to block average Resultant samples per second dependant on rATE setting If rATE is set to 10 samples per second 2 5 samples per second 1 25 samples per second 1 6 seconds per sample 3 2 seconds per sample 6 4 seconds per sample 12 8 seconds per sample 25 6 seconds per sample 10 samples per second Nn OU bb UY NP O If rATE is s
40. AAE EE EAE EAA AA AI AR 70 Read COMMana Exa ME oa ic 71 Execute Comman EXAMP anar ais 71 Manera A E AEAT 72 Host Command Message Te OMe orar citan 72 Slave Response Message F Ol Mal Svavccsnatchcwayahorais udeahuven Game A ETA E A a dde 73 dite Gol nal caclic eee re Mee ee Cene Ret er eee ne nn ee eT Ce ie ee ee re er eS ee Cre ee aid 73 Read COMMING Sawer weg aaraa neat e del A dee oleh de 74 PET OWN CON ENC rra Aci 74 A OO 74 A he usec E E E E een teamed A 75 Using a Printer or Remote display cisco ia 75 Selecting ches Priel UNION Saca naaa ida 75 anemia SAR SAR o 76 FOLmat Of OULD UC Aras Unos 77 foci errr rrr Te AAA 78 Mecha Clin AA AS SA os 78 ECB20 Board Mod laa Sea aaa RARO aa a ia ada reas toe 78 LAC ABS CaSe aras Hani assignees ular was acd Pacer ai A E A an Sabie uaa ia 79 ELL IAMS AISLE datado sd as 79 ESS STamiess SLCC Case rs A e nella A ea neta ae eats der alla ataiae EAN 80 LDC De Cast Case musa tn Pans ae eel gat saa atl Silat ag lio e e ail EARE e e e uN 81 DAN als ad aio dai ctd nen EE O 82 COUN CONS aaa arias Gohl dike tata emai aii ia dde iaa tato aio oro 83 Programmar Module acatar trat ltda cintia dla 83 dos E T ese deals lea 83 A SS RAR 83 Power SUPDIIES rta ert tet ta idea duda ac 84 ESMAS SUPP traidos cti ra tdi deasavatelnsieseoaieonadiant tar clic c alos 84 Fiten Module toMa BOI nat a ade 84 O 85 SINAC TOTZ OVAC rior a aa ooo ca trono root catolicos resaca de 85 A A O te uaeea edad Rance NE Ranaind E manae e
41. Error Codes Are Supported Which Are Used As Follows 01 Ilegal Function request for function other than 3 or 16 02 Illegal Data Address attempt to read an unsupported register address 03 Illegal Data Value attempt to write a read only parameter or message too long for buffer valid messages have a known maximum length Write Command Example Write value 1 23 to Calibration High Value CALH to registers 57 58 on Device ID 4 1 23 in floating point format is represented as Ox3F9D70A4h Data transmitted by Master OA Data Length Number of Registers Starting Register Function code Device ID A correct LCA20 response would then be Number of Registers Starting Register Function code Device ID Page 70 LCA20 User Manual 517 182 Revision 1 4 Read Command Example Read the Setpoint value SP1 from registers 43 44 on Device ID decimal 57 Data transmitted by Master Number of Registers Starting Register Function code Device ID A Correct Response from a LCA20 with a SP1 Value of 12 34 0x414570A4h would then Be ORAR Function code Device ID Execute Command Example Execute Relay Reset command using registers 235 236 on Device ID decimal 57 These commands are same as write commands except the data sent is irrelevant and in the example below data is sent as 0 which is represented as 0x00000000h Data transmitted by Master Data Length Number of Registers Starting Register Functi
42. LCA20 can be connected to a controller or printer LCA20 User Manual 517 182 Revision 1 4 O The cable screen should NOT be connected to both the Scr at the LC4 and the controller or printer The cable screen should be connected to either the Scr terminal of the LC4 or a suitable screen connection on the controller or printer O Cable length for RS232 should be restricted to 25 metres RS422 and RS485 4 Wire RS422 is a 4 wire connection used to connect to a single device or multi dropped devices i e Multiple LCA20s may be connected to a single controller O The cable screen should NOT be connected to both the Scr at the LC4 and the controller or printer The cable screen should be connected to either the Scr terminal of the LC4 or a suitable screen connection on the controller or printer O For 4 wire RS485 RS422 use individually screened twisted multi pair cable Such as Farnell 121 8651 the pairs should be Tx paired with Tx Rx paired with Rx Multi drop Connections LCA20 1 LCA20 2 LCA20 3 LCA20 n a 1 OFF 8 1 PTET TT lle The last LC4 module in the chain has DIP switch position 3 set to On Page 96 LCA20 User Manual 517 182 Revision 1 4 RS485 2 Wire RS485 is a 2 wire connection used to connect to a single device or multi dropped devices i e Multiple LCA20s may be connected to a single controller O The cable screen should NOT be connected to both the Scr at th
43. SP1 Relay 1 operates at SP1 IF1 Hysteresis amount applied to SP1 Invert SP1 Yes Inverted SP1 operation No Normal SP1 operation Latch SP1 Yes Latching SP1 operation No Normal SP1 operation Revisi n 1 4 rLS1 rLY2 SP2 IF2 HYS2 InV2 Ltc2 rLS2 AnOP OPL OPH AnOP AOPS 19999 19999 19999 0 19999 19999 19999 net 0000 0000 0000 0000 No No nEt 0000 0000 nEt 4 20 Relay 1 source taken from nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value Relay 2 Menu Desired Set Point trip value for Relay 2 In Flight compensation for SP2 Relay 2 operates at SP2 1F2 Hysteresis amount applied to SP2 Invert SP2 Yes Inverted SP2 operation No Normal SP2 operation Latch SP2 Yes Latching SP2 operation No Normal SP2 operation Relay 2 source taken from nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value Analogue Output Menu Output Low display point for minimum Analogue Output Output High display point for maximum Analogue Output Sets what Value the Analogue Output operates from nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value Selects Analogue Output current or voltage 4 20 4 20mA current output 0 10 0 10V voltage output InV 2 Adj 3 4 20G 3 4 200 3 0 10G 3 0 100 3 LCA20 User Manual 0 9 to 1 025 1000 to 1000 0 9 1
44. Sense pins2 amp 5 Signal pins3 amp 4 O Terminate all screens at SCR The screens should not be connected at the transducer end of the cables However if the transducer has an EMC gland then the screen should be connected there and not at SCR on the LCA20 Page 8 7 LCA20 User Manual 517 182 Revision 1 4 Connector Location Lic BRA D O O O O o oo 0 OJO OOO oO oO 8 4 Wire If the load cell is supplied with a 4 wire cable and long cable lengths are required it is recommended that any extension cabling required is 6 wire to compensate for voltage drops along the cable Once a 4 wire system is calibrated any changes to the cable length will require that the system is re calibrated Please refer to load cell manufacturer s instructions O When 4 wire connectivity is used it is important that the respective Excitation and Sense connections are linked together SCREW TERMINAL BLOCK eee w SCREEN SCR Rcable a EXCITATION OUTPUT OUTPUT EXCITATION Page 88 LCA20 User Manual 517 182 Revision 1 4 6 Wire Where load cells are provided with 6 wires then it is recommended to continue the 6 wires connectivity throughout the system SCREW TERMINAL BLOCK SCREEN Reable 7 ES A EXCITATION ba SENSE OUTPUT _ OUTPUT SENSE EXCITATION Page 89 LCA20 User Manual 517 182 Revision 1 4 Barriers The LCA20 can be used with isolating barriers This allow
45. Simplified External Connections Internal Circuitry 1K or or a Switch Relay NPN Open Contact Collector Screw Terminal Block E Transistor Page 91 LCA20 User Manual 517 182 Revision 1 4 Analogue Output There are two analogue output available on the LCA20 a 0 10V voltage and a 4 20mA current They are both driven from a single Pulse Width Modulated PWM source meaning they track each other and use the same scaling factors The analogue outputs are isolated from the load cells digital inputs and power source but are common to each other We recommend using a cable with a screened twisted pair such as ALPHA WIRE 5121C available from Farnell stock code 130 2298 The screen should be connected at either the LCA20 or the remote device but not both thus avoiding ground loops Connector Locations Voltage For voltage output the cable lengths should be kept to less than 20m Voltage outputs are more susceptible to electrical interference so where long cable lengths are required the current output should be used If the screen is to be connected at the LCA20 then it should connect to the terminal marked V Screw Terminal Block Page 92 LCA20 User Manual 517 182 Revision 1 4 Current The current is suitable for driving long cable lengths and in areas where higher electrical interference is likely If the screen is to be connected at the LCA20 then it should connect to the terminal marked V O The maxim
46. SnP Do Snap Hold current value Page 24 gt dIP3 2 LCA20 User Manual 317 182 At Digital Input 3 function At Perform Tare Lr Latch Relay Reset Prnt Do Print dEFt Display Default display set by ddiS GroS Display Gross value nEt Display Net value PEAK Display Peak value VALY Display Valley value SNAP Display Snap Held value PV r Peak amp Valley Reset SCon Shunt Cal On SCoF Shunt Cal Off SCtG Shunt Cal Toggle on off dSnP Do Snap Hold current value Page 25 Revision 1 4 Auto Calibration Using the Keypad a simple two point calibration can be performed Auto calibration captures live load cell input values in mV V terms and relates them to required engineering unit s values The input can be acquired by loading the load cells with known weights or by injecting known mV levels for the required engineering values These known mV V levels may be taken from a load cell calibration sheet or by measurement The two calibration points should be near the required lowest point typically an unloaded structure reading zero weight and at least 75 of the highest point This will help provide an accurate extrapolation over the desired calibrated range The sequence of calibration is not confined to capturing the Low calibration point CALL first This is useful if a vessel already has a known amount of product in and it is not practical to empty the vessel before starting the calibration procedure For example the calib
47. al access to the LCA20 to power cycle or to push the button you can connect manually by clicking the Manual Connect text on the Home page To connect manually you will need to know the baud rate configured in the module along with the station number Also to manually connect the module must have been configured for Mantrabus2 protocol S LCA Toolkit Manual Connection COM Port Advanced Calibration COM3 The best way to connect to the LCA20 is by using the built in detection functionality v This page allows you to change But to do this you need access to the power supply or the physical button Sometimes this is not practical In these cases you will need to connect manually which ihe andhde Hote that the Baud Rate can be achieved from this page Toolkit wil detect connected 1 1 5200 7 modules regardless of these The LCA20 must be configured to use the MantraBUS2 protocol for manual detection to settings work and you will need to know the COM port that the module is connected to the Choice of protocol will depend Station Number baudrate configured in the module and the station number configured in the module on your software 1 gt communication capability the communications settings of Select these settings on the left then click the Connect button If you do not know these settings then the automatic detection connection is the only way to connect Click the Back button to do this Back Connect 4 LCA Too
48. an be reset from a digital input or using the communications port Page 113 LCA20 User Manual 517 182 Revision 1 4 Snap Command Executing the Snap command by either the serial communications or one of the digital inputs configured to Do Snap will store a snapshot of the Snap Source value at that instant in time The Snap value can be recalled later by three means e Set the display source to Snap to view the stored value on the optional display e Configure one of the digital inputs to Display Snap Value and apply a closed contact to view the stored value on the optional display e Via the serial communications interface by reading the Snap parameter By setting Digital Input 1 to Do Snap Digital Input 2 to Display Snap Value and Digital Input 3 to Display Gross Value the snap value can be captured by a contact closure on Digital Input 1 displayed via Digital Input 2 and the display reset by Digital Input 3 to show live Gross again The SNAP command also enables readings from multiple LCA20s in an installation to be synchronised by issuing the Snap command either via the communications bus or a physical input connected to the suitably configured digital inputs to each unit simultaneously and then polling each device reading its Snap value Page 114 LCA20 User Manual 517 182 Revision 1 4 Appendix C Relays Overview The optional Relay output module RL1 provides two output control signals which can be used for switching
49. art with the correct three digit slave address and and end with lt CR gt with no intervening extra l The slave will then always respond There are three possible types of response acknowledge ACK acknowledge with data for a read and not acknowledge NAK 1 ACK isa single lt CR gt character This confirms an action or write command 2 ACK with data is a decimal number followed by lt CR gt This confirms a read and returns the data value 3 NAK isan lt CR gt sequence The device rejected the command There are several possible reasons for a NAK response e Command identifier not recognised e Badly formatted command such as missing command identifier unrecognised access code character or unexpected character somewhere else e Access attempted not supported by this command NOTES e From receipt of the host s terminating lt CR gt to a response from the device if any will be at most 50mS After this it can be assumed there is no response e There is no value checking A slave cannot NAK a command because a write data value is unsuitable in some way only if write access itself is disallowed For the Ack with data i e a successful read command the returned value consists of printable ASCII characters finishing with a lt CR gt formatted according to the DP Write Command If the device accepts the command then a lt CR gt is transmitted There is no error checking on the data rec
50. ate supplied with the LS1 and LS3 must be fitted after connections have been made Fitting Module to Main Board The module fits to the main board by plugging the white connector on the underside of the LS3 module into J 11 on the main board Four nylon pillars also engage into the four hole positions shown If metal pillars are fitted to the main board these will need to be removed first Page 86 LCA20 User Manual 517 182 Revision 1 4 Supply Connection Load cell Connections The LCA20 offers a direct connection to a range of low level foil strain gauge sensors Gain sensitivity is optimised for two ranges 0 5 to 3 7mV V and 3 7 to 7 8mV V selected by the Sensitivity parameter in the menu A stable 5VDC excitation supply at 150mA is provided which is sufficient to power up to ten 350 ohm load cells connected in parallel Ratiometric strain gauge measurements are taken which cancel out errors caused by changes or drift in Excitation voltage The LCA20 facilitates 6 wire measurement which allows for voltage drops caused by long cable lengths between the LCA20 and the load cells where barriers are used or if the load cells are powered from another source Where possible use 6 wire connections to the load cells For load cell connections we recommend the use of 3 pairs of twin twisted pair cable such as Alpha Wire 5123C SL005 available from Farnell 130 2249 The pairs should be arranged as follows Excitation pins1 amp 6
51. ation function so a valid Applied Weight Applied Weight system will give a known value of 100 q 0 000000 BEET 1 0 000000 mV V Input Calibrated Value Underrange Value Overrange Value Uni 10 00000 MN 35 00000 MM 1 999420 M 23 99140 LCA Toolkit LCA20 Module serial number 999999999 set as station 253 on COM2 Version 1 0 1 Measurement Points Enter between 2 and 10 measurement points These are the points at which weights will be applied This process will linearise as it calibrates The following pair of controls will be available for the number of measurement points selected Applied Weight Enter the known weight applied at this measurement point The weights must be applied in ascending order Acquire Button Once the input has been given enough time to settle click this button to acquire the point and start calculating calibration values You can then redo the calibration at this point again or move on to the next calibration point Start Again Click this button to restart the calibration process Page 48 LCA20 User Manual 517 182 Revision 1 4 Table Tab Select this tab if the mV V input values are known for 2 or more known weights This can be used to calibrate based on load cell manufacturer certificates and there is no need to apply actual weights O Each time you enter this page it will hold the last data entered or will be blank ready to accept values e The page is used to generate the calibration
52. auto cal calculates the values for the first two points in the table using the mV V values captured for Calibration Low and Calibration High parameters The output from this process is termed the Calibrated Value 6 The System Zero parameter is then added to the Calibrated value to give an intermediate internal value known as Pre Gross Value 7 If block average has not been selected as determined in 2 above and the Filter Steps parameter is non zero then the Low Pass Filter algorithm is implemented This is covered in Appendix B Measurement Filters The Pre Gross value is updated with the result of the Low Pass Filter 8 The Pre Gross Value is checked against the Over and Under Range parameters and If exceeded or if the internal input over or under range flag is set then the Status and Flag Parameter is updated accordingly The Flag parameter being a non volatile latched flag requiring user intervention using the communications port to be reset The Gross and Net values are set to over or under range values also This ensures that the display relays analogue output and communication ports all detect and recognise this error condition Page 109 LCA20 User Manual 517 182 Revision 1 4 9 Pre Gross Value is now adjusted with the Zero Tracking value Zero Tracking is enabled when the Zero Tracking Band parameter is non zero 10 Net is calculated by adding the Auto Tare parameter to the Gross 11 The Peak value is checked agai
53. ave a Master Slave topology where the LCA20 is a slave device The Master has control of the bus and is responsible for ensuring correct flow of messages on the bus that is to say waits for a response from the Slave device if one is due before transmitting other Master messages Note This document refers to bits in the range of 0 7 or 0 15 MantraBusl Proprietary NO Backward 1 Parameter data Not compatibility with must be read as recommended Legacy products block for new design 2 Limited PC support available 3 Not floating point format MantraBus2 Proprietary YES 1 Single 1 Not as efficient as parameters can be data transmitted in read nibbles 2 Floating point format 3 Lots of software support Modbus RTU Standard YES 1 Third party Great for support for PC Labview 2 Direct Registers must connection to PLC be read as pairs that support only Modbus Page 54 20 User Manual 517 182 Revision 1 4 d re AO N OJ J L MantraASCIl2 Proprietary YES 1 Simple to write 1 More data software for transmitted 2 Can be used by therefore slower a Terminal 2 Not checksum on programme data sent or 3 Easy to debug received No software 1 Can only be used required data on a one to one sent on demand connection from digital input 2 Data out only Printer ASCII data NA Designed for Printers ASCII Display modules Software Command Reference for MantraBus2 Modbus and MantraASCll or continu
54. ay Snap Held value Peak amp Valley Reset Shunt Cal On Shunt Cal Off Shunt Cal Toggle on off Do Snap Hold current value dIP3 rLSl rLS2 AnOP 4 20G 0 9to 1 025 4 200 1000 to 1000 0 10G 0 9 1 025 0 100 1000 to 1000 Auto Tare nEt nEt nEt 1 0 0 1 0 0 Digital Input 3 function At Perform Tare Lr Latch Relay Reset Prnt Do Print dEFt Display Default display set by ddiS GroS Display Gross value nEt Display Net value PEAK Display Peak value VALY Display Valley value SNAP Display Snap Held value PV r Peak amp Valley Reset SCon Shunt Cal On SCoF Shunt Cal Off SCtG Shunt Cal Toggle on off dSnP Do Snap Hold current value Sets what Value the relay 1 operates from nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value Sets what Value the relay 2 operates from nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value Sets what Value the Analogue Output operate from nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value User adjustment for 4 20mA gain Replace function of the LCA15 gain potentiometer Unit gain 1 0 User adjustment for 4 20mA offset Replace function of the LCA15 offset potentiometer Note the value is in PWM counts not mA User adjustment for 0 10V gain Replace function of the LCA15 gain potentiometer Unit gain 1 0 User adjustm
55. connecting the Load Cells Page 28 LCA20 User Manual 517 182 Revision 1 4 Using the LCA Toolkit Software The LCA Toolkit software for Windows will allow a connection with the LCA20 via an optional on board communications module LC4 or via an optional programming cable PGM1 What Can It Do The toolkit allows all aspects of the LCA20 to be configured Everything that can be achieved with the plug in programmer display can be achieved with the toolkit plus a great deal more You can e Configure settings e Log data to a CSV file e Save and restore settings to a file e View data on a chart e Calibrate load cell e Use asa large display e Calibrate analogue outputs Using the Software LCA20 These items just display data and you cannot interact with them These items are editable in place Click on them to be able to change the contents These items are dropdown lists Click on them to drop down a selection of items that can be clicked to select as shown below These are buttons They will change colour dramatically when your mouse passes over them and look like this e Click to activate These items are tabs The selected tab is not orange but you can click on the other tabs to select them Different tabs will show different control items when clicked Page 29 LCA20 User Manual 517 182 Revision 1 4 Home Page a This is the first page shown after the software launches Some of the pages shown h
56. d in the table above Command BAUD Baud rate SENS Load cell sensitivity RATE Measurement Rate AOSL Analogue output type DDIS RLAY ANOP Display relay and analogue output source DIP1 DIP2 DIP3 Digital input 1 3 assignment Page 58 LCA20 User Manual 517 182 0 O Bee I NI ES 101 MS Oh Fe po NAS OMS OS COM OR OC eet p NS e e he PEO WN F Value Function 2400 4800 9600 19200 38k4 57k6 76k8 115k2 3 7 7 8mV V 0 5 3 7mV V 10sps 80sps 4 20mA 0 10V Net Gross Peak Valley Snap Auto tare Latched relay reset Print Default display Gross Net Peak Valley Snap Peak Valley reset Shunt Calibration on Shunt Calibration off Shunt Calibration toggle Do Snap Revision 1 4 MantraBusl MantraBusl is selected by setting the Communications Protocol equal to 128 The protocol is HEX based meaning that it transmits and receives binary data in the range of 0 to 255 OxFFh The data is received and transmitted as signed 15 Bit form where the 15 bit is used to indicate polarity not two s complement see later To signify commencement of a new command the HEX number OxFFh is used as a frame character followed by the Serial Device Station number of the unit under interrogation The LCA20 will only act upon incoming data if its own Serial Device Station number immediately follows the OxFFh character For MantraBusl the Serial Device Station number has a range of 1 to 254
57. data seen in the Advanced Tab but does not reflect any data held in the module 8 LCA Toolkit aad Calibration ASA AA MOR Input Sensitivity Decimal Point Mode Help 0 5 to 3 6 mV V 19 999 v LCA20 v This page allows you to calibrate the module Table Shunt Calibration Cal Info Table calibration allows calibration by specifying mV V output values for known weights applied to the connected loadcell Calibration Points mV V Engineering Units 4d 0 000000 0 000000 YA 0 000000 0 000000 Engineering Units Calibrate mV V Input Calibrated Value Underrange Value Overrange Value Units 19 99900 19 99900 MM 0 650778 E 0 984214 LCA Toolkit Version 0 0 25 LCB20 Module serial number 999999999 set as station 253 on COM2 Calibration Points Enter the number of known mV V and engineering unit value pairs The following pair of controls are repeated for each calibration point mV V Starting from the lowest mV V value enter the known value for this point Engineering Units Enter the known engineering unit weight for the stated mV V value Calibrate Click the Calibrate button to calculate the calibration settings based on the information entered Page 49 LCA20 User Manual 517 182 Revision 1 4 Advanced Tab This gives access to the internal gain and offset values This is considered advanced and care should be taken in this tab The data shown on this page is the actual calibration data held in
58. di 121 ECA TOORE LOCK at AA AS AAA EA ARAS AA IAN AAA 122 Appendix G ManUal Cometa aaa 123 SHECIICALIONS ron ELECO Ts ACERA EA AAA AR 124 ELECO ME ada 124 E A NO 124 A ato due QUEUE taa lp ana ode ai oda 124 POWEFSUDDIY Sip ES O A OI coa 125 Mah cg TS 125 Communications RCs ee ee en a er An rer ee 125 ENVIO MEN usan dada 125 RegUlato Vaciar cian 125 CE AD DOV Sida AAA AAA AAA RATA A 125 EU See OEM Ce CIN each atadas ee 125 CowWoltade Direc HVE serrin niana eratis canta E E a A nna ra 125 TrOUDIEeSNO0 UN E E A A A 126 General connection and setup parameters No display on power Up ccc cece cece cece eee eect e anna 126 Display shows 1 or 1 continually without a weight applied to the Strain Gauge oocccccccccnccccccccnnn cnn nn rra 126 Display over ranges 1 or 1 when or before the maximum required weight is applied to the Strain Gauge ooo 126 DISPLAYED a A ne 126 Display operating N W Ong CINGCEI OI urr Enen E acai ara vaa 126 JUNE AN Rel acej auto carate aera AAA 126 Relay module InConrect relay operatio Mosson rE AEEA NE E E AEEA eda A EAE TO 126 NO cO MMC OS sort A AA A tee eee 126 Order COn Sr dd 127 ACCE SOTIE S ta as a air ca 127 Configuration Record Neu aba 128 ECALS MO esca ad bd ta a deca 128 SN a Ll a a in at ado naa 128 PASS Word Lee Zara AAA AIN ARAN ARA id 128 Password Level e a e eo a a a do uae Sic lal sa a 129 EA Oaa RR RAIN 130 Wai icis ced 132 Page 4 LCA20 User Manual
59. e LC4 and the controller or printer The cable screen should be connected to either the Scr terminal of the LC4 or a sultable screen connection on the controller or printer O Use single twisted pair cable for 2 wire RS485 Such as Farnell 130 2298 O Mantrabusl communications protocol cannot be used on 2 wire RS485 bus Multi drop Connections LCA20 1 LCA20 2 LCA20 3 LCA20 n The last LC4 module in the chain has DIP switch position 3 set to On Printer A printer may be connected with an interface of type RS232 RS422 or RS485 See the above sections for connection information Page 97 LCA20 User Manual 517 182 Revision 1 4 Programming Cable PGM1 For communicating with the module using the LCA Toolkit for configuration or firmware updates you have the option of using the PGM1 programming cable This is a cheaper option than fitting an LC4 communications module and is intended for engineers to use in the field for configuration or for in house configuration of modules that are to be installed with no communications module The programming cable plugs into J 14 on the LCA20 module and plugs into the PC USB socket masa O Grn Blk ojo o 12 3 O Please ensure correct orientation as marked by colour coding on LCA20 PCB This will appear as a virtual RS232 port COM port on the PC O When using the PGM1 cable the keypad on LP1 and LP2 displays are disabled The PGMI cable is available fro
60. e baud rate using the keypad or the communications interface The Baud rate in the LCA15 had to be set manually by gaining access to jumper links on the communications module Another benefit of the higher clock rate is the ability to speed up the response of the Analogue Output due to higher PWM frequencies being available Other benefits from the new processor include in field re programming of the device on site firmware upgrades are now possible With more code space and memory available more functionality can be offered such as nine point linearisation low pass filtering programmable digital inputs and self diagnostics The load cell input design has also taken advantage of new technology in the form of the delta sigma 20 bit ADC This device has a built in low temperature drift low noise amplification stage with switchable gain leading to a much improved measurement performance over the LCA15 The DIL switch fitted to the LCA15 for mV V selection is no longer required as the two ADC gain ranges cover from 0 5mV V to 7 8mV V sensitivities The appropriate range is selected from the Keypad or communications bus removing the need to gain access to the electronics As with the majority of Mantracourt s instrument range the excitation voltage has been decreased to 5V thus allowing for easier barrier selection and the drive capability for up to ten 350 ohm load cells connected in parallel The LCA20 is factory calibrated in mV V terms to within 0
61. eck that an LC4 communications module is fitted e Check LC4 Sw1 settings e Check correct CP code is entered for required protocol e Check serial device station number is correct e Check Baud rate setting in LCA20 menu is correct for the host e Check host communications port is set to 8 bit word 1 start bit 1 stop bit no parity e Check correct protocol is being observed by the host Page 126 LCA20 User Manual 517 182 Revision 1 4 Order Codes Type Description Details Code Input Standard Strain Gauge 5V DC Excitation 150mA DC voltage 0 10V LCA20 Outputs Standard Analogue DC current 4 20mA Optional Modules Communications Port Printer RS232 amp RS485 LC4 2 Relays Output Control Alarm Relays SPCO on SP1 amp 2 LR1 l 110 240V AC 50 60Hz 10W LS1 Power Supplies AC and DC Power Supplies 9 32V DC 10W LS3 l On board LP1 Programming Units On board and handheld rs ES LP2 LCA20 LR1 LC4 LS1 Standard LCA20 in ABS case with relay module communications module and 110 240 volts AC power supply Accessories Type Description Code Diecast Enclosure LDC Enclosures Stainless Steel Enclosure LSS DIN Rail Mount D2 Programming Cable Programming Cable PGM1 Page 127 LCA20 User Manual 517 182 Revision 1 4 Configuration Record Sheet LCA15 Mode Product Product Code Serial No Tag No Date Location Measurement type range amp engineering units Calibration Date Calibration Interval Password Level
62. eived by the device Example A command to set the BAUD parameter to three on Serial Device Station number 1 would look like this 1001 BAUD 3 lt CR gt Assuming a device with Serial Device Station Number 1 is present it will respond with lt CR gt Page 73 LCA20 User Manual 517 182 Revision 1 4 Read Command Returns the requested value specified by the command The returned value is formatted according to the Decimal Point DP The response consists of a sign character 5 characters for the value a decimal point and a terminating lt CR gt The length of the response is thus fixed as follows For integer values or engineering values with no decimal point 7 characters are sent For engineering values with a decimal point 8 characters are sent Examples A command to read the Display value DISP output will look like this 1001 DISP lt CR gt If the display value 32 1 and the Decimal Point DP 3 then the response string will be 032 10 lt CR gt A command to read the Low Pass Filter Steps FFST output which is an integer value will look like this 1001 FFST lt CR gt If the value 20 then the response string will be 00020 lt CR gt Action Command If the device accepts the command then a lt CR gt is transmitted Example A command to reset Serial Device Station number 14 will look like 1014 RST lt CR gt The response string will be just lt CR gt Broadcast Commands If the stati
63. enaneenenns 55 MUTEIBTC Ophion Selection aleros ca iden 58 WARE ADU SE Gia eteta ee Rd NRO a AA NINAS NA tota eacneeie on aun ner ee Gives 59 ODEFAGLON wn ti ra E SO T ETTA E O a enw ore Mee red uu E N E ane Utne deat ont ui eae ene 59 WHEMO EO Paramete anciana asaltada daa 59 Command Tabs AA E E eee ee rea ee ee ae ee ere a ee een eee ee 59 Command TARSIA esrara Te Me Te ee O A Mr ee ee Rr en eee a 60 Command 2 RETA Net is tad ema snd eee ade Cee cae ww nea R TR ne ANAT AIST en wane 61 Wite COMMON cane 61 Response tO WES COMMANAS a raa aT r A dina 62 EEPROM CO MMS it O a A E a a a A a a dai TETA 63 Write Commands TRAE Perform ACTIONS isian a aE A A AETA a A dd ee 64 Mantra US lea ai a a a A a abs 66 Fanno Chara ctenar erae AE TEKE A A ANAE E ANOA A AAR AAA AAEN 66 Galata lt u lag eee cae seer a a E a S a a a ae ae R a A 66 Bata A A E AN E E A e E ee AR E E E A E a RT Nn A E 66 Floating Point Data FORMNal naonnet AAA A AAA AAA DARAS 66 ENG Or Data HOMIE sesos pl a e O e O o de ld O al 67 ARCANO a a ae 67 W ENOTO Parameter Sa A EA AA A da 67 REading 0f Parameter Sapna erate a o E N cp le ba uae atid eas 68 ACUONCONMNMANO rara in O NP 68 MODAS AAA A A ee er ee aia 69 Modbus Mess a de a a e od a a e O Cota SRE 69 Parameter MOULCSSES btu iia aaa amis matas animada ada cosas 69 Page 2 LCA20 User Manual 517 182 Revision 1 4 Parameter alle ad lo le ee o eta eo cl ole e a ese tad loli do 69 O aan E A EA 70 Wit ECO Mm mance aM Plea aae a teary
64. ended to the printed display value A large range of labels are available to the user see below O The printer is electrically isolated from the Strain Gauge input by virtue of the LC4 Communications Port Selecting the Printer functions The Communication Protocol Parameter CP sets the format of the printout and whether the output is on demand by contact closure or a continuous output stream The value of CP to be entered is the algebraic sum of the following components Printer on demand Inhibit log number Inhibit line feed 4 Streaming output 64 O Streaming output sends a new string to the communications port at the same rate the display is updated Page 5 LCA20 User Manual 517 182 Revision 1 4 O For backwards compatibility with LCA15 a Communications Protocol CP value of 127 gives the equivalent functionality as a value of 64 Example 1 Streaming printer output with no log number 64 2 66 set CP to 66 outputs a continuous ASCII stream of the display data transmitted on every display update Example 2 Print via contact closure on digital input with no line feed 1 4 5 Label Parameter Selects the appropriate unit of measurement from the following table O A value of 0 means NO LABEL Value Label NET Label NET Label 0 BLANK gram mA DC 1 Deg R kg VAC 2 Deg C 31 Ib 60 mV AC 3 Deg F 32 kWh 61 A AC 4 Kelvin 33 mile h 62 N 5 Ib in2 34 63 mm s 6 bar 35 ton 64 ga
65. ent for 0 10V offset Replace function of the LCA15 offset potentiometer Note the value is in PWM counts not V item Range Default Description OVrV 19999 19999 Over range value The Value at which the display will indicate a Positive over range condition and force the relays and analogue output to behave accordingly Display shows 1 undV 19999 19999 Under range value The Value at which the display will indicate a Negative under range condition and force the relays and analogue output to behave accordingly Display shows 1 tYPE LCA15 Selects the mode in which the LCA operates Selection Description value LCA15 Restricted functionality as per the original LCA15 LCA20 Full functionality of the LCA20 Menu items from Password 2 follow on from this menu Page 17 LCA20 User Manual 517 182 Revision 1 4 LCA20 Mode Keys The LCA20 has a multilevel menu system The parameters available are dependent on the password level that has been entered 9 Used to scroll through the menu items available at the current menu level When a level has been entered that holds parameters then this key scrolls through the parameters available At this point if the scroll key is not pressed for 3 seconds then the current value of the parameter is displayed gt Initially used to enter into the next menu level When displaying a parameter value then this key selects the display digit to be modified The selected digit will flash togethe
66. er range condition exists o The unit has had a watch dog reset Cleared only by power cycling e The LED is permanently ON indicates the unit is either attempting to connect with the toolkit or already in communications with the Toolkit e Led Flashing approximately 10 times a second indicates the unit is in boot loader mode either waiting to be re flashed or because an incorrect or no Flash file exists in the processor See Also Using The LCA Toolkit Software Save amp Restore for more information regarding updating the firmware Page 102 LCA20 User Manual 517 182 Revision 1 4 Push Switch SW This Switch is used to connect to the LCA Toolkit without the need to power cycle See Using The LCA Toolkit Software section for operation The LCA Toolkit software searches for modules connected to the serial bus and the modules can be power cycled to enable the software to detect them Because there can be up to 250 modules connected the software can take a few seconds to ensure it has allowed enough time to detect all possible modules If only one module is on the serial bus then you can press and hold the push switch for 1 second and this tells the software not to wait to detect any more modules O The button needs to be held in for at least 1 second Page 103 LCA20 User Manual 517 182 Revision 1 4 Appendix A Calibration Best practices e Before calibrating the LCA20 it is advised that the device be powered on for 20 mi
67. er simple block averaging Which will change the rate at which new values are generated or a digital low pass filter Block Averaging Filter Level 80 samples per second v 0 000000 Enabling the recursive filter By setting a nonzero value for Filter Steps will disable Filter Steps the simple Display Averaging filter Update Rate 80 samples per second 3dB Down Point Filter disabled LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 25 Rate Here the basic selection of A D measurement rate can be selected The slower rate will have an improved noise free resolution Filtering This section allows the choice between simple block averaging or digital low pass filtering Choosing block averaging will slow down the generation of new values which will be noticeable on the optional display or via the communications bus The digital low pass filter will result in new values being generated at the A D measurement rate Block Averaging Select the required rate at which new readings are generated This is in the form of samples per second or seconds per sample Filter Level If the difference between the newest unfiltered value and the previous filtered value is greater than this filter level value then the filter is bypassed and the gross will jump straight to the unfiltered value If the difference is less than the filter level value then the filter will be operational Filter Steps
68. ere may not be available if your module has been locked by the supplier LCA Toolkit Home h Select COM Port Advanced Calibration The software can detect modules connected to an RS232 or RS485 port Thi Hic pean Solan OS First select a COM port Power off the module s Click the Detect button Apply power to the module s eee to COM1 Detect Manual Connect You may have multiple modules connected Detected Modules If no modules are detected you can click the Demo button to explore the software No module selected LCA Toolkit Version 0 0 25 The serial ports COM ports on the computer are detected and added to the drop down list on the top left of the page If you are using USB to RS232 or RS485 convertors then you can plug them in at this point Clicking the drop down list will automatically re detect available COM ports To detect the connected modules e Power off the LCA20 modules e Select the COM port that you module is connected to and click the Detect button e Apply power to the LCA20 modules Or if you have access to the push button on the module board you can press this Hold for 1 second This saves time if you only have one module connected as the software does not then have to wait to detect all other possible modules See Installation Push Switch SW for more information The Toolkit will automatically detect all LCA20 modules connected to the selected COM port regardless of t
69. ersion 0 0 39 Revision 1 4 Analogue Outputs This page allows the configuration and calibration of the analogue outputs LCA Toolkit _ Analogue Output mo TT AAA OR gt Output Select Source Help 4 20mA y Gross v This page allows you to save the configuration of the analogue MELIA Automatic Advanced Trimming Enter the input values that are represented by the lowest and highest analogue outputs output Output Low NS 0 005454 Calculated Analogue Output 4 004363 fm Inverted LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 25 Output Select Choose between 4 20mA current output or 0 10V voltage output Source Select the source value that the analogue output is based on Inverted Select this to invert the output The original LCA15 did not allow Output Low to be higher than Output High so this option had the same effect as entering a higher value for Output Low than for Output High This new module will allow you to do this in both modes so this option is for backwards compatibility Manual Tab This tab allows you to manually specify the values that relate to the minimum and maximum analogue output levels Output Low Enter the value of the source selected above at which the analogue output will be at the minimum level 4mA or OV Output High Enter the value of the source selected above at which the analogue output will be at the maximum level 20
70. esolution of approximately 13 bits or 1 part in 8000 O WARNING Maximum load on voltage modules is 10mA Maximum drive voltage available for the current range is 20V Source The value the selected analogue output 4 20mA or 0 10V calculates its output from can be sourced from Net Gross Peak Valley or Snap values Scaling Output scaling factors are set by the user and determine the display range over which the analogue module operates Output Low This sets the displayed value at the analogue outputs minimum e 4mA or OV Output High This sets the displayed value at analogue outputs maximum output i e 20mA or 10V If the display is outside the range defined by Output Low and Output High scale factors the analogue output will remain constant at its minimum or maximum output value So for example if the 4 20mA output is selected and Output Low scale factor is set to 00 00 whilst the Output High scale factor is set to 100 00 then if the source value is at 00 00 or less the 4 20mA output will be at 4mA level and consequently if the source value is 100 00 or greater the 4 20mA output would be at 20mA Inversion of the analogue output can be set by the Output Action parameter or transposing Output Low and Output High scale factors Calculating the Scale Factors Example Assume a 4 20mA output module is required to provide an output of 4mA for 1000Kg and 20mA for 6500Kg Set Output Low to 1000 and Output High to 6500 It w
71. et ana eanarnA 85 S31 SUD le eds 86 FELNO MOGUL E to Mal BO dra A San 86 UI A nui 87 Load cell Come cio rita a A ll tinue acter At A 87 CONNECTOR LOCA ON A comaencctcoia rara rara Stata Gowen meatal orion E gee 88 oa io do ra tancias 88 O VIS ate aerate ain ee pd acre AE AS AA AN A E AO 89 Sao atrial 90 A A AAE O 91 A ee a re EE er eee eee ere 91 Osan eT seer eee eee ee ee ee eee eee E E ee eer Seer erst eee rr ere 91 PROCS 81 0 UE a sd hae ite ae NS 92 Connector Locator a a SA a a Nan 92 MAA e e nl iM dia Le 92 CU a tatoo 93 Relay MOM aa A A SA 94 FINO Module to Mal BO diras aa a va tank ante std in SE NS 94 contact COMMCCHONG ato ocio ac ota roca aa io Oro carionnn semi en ep aaanes 94 Communications Module LEA scared iia damn ena mated oa 95 FILUna Module Eo MAA BO Uri Ade 95 OZ RN 95 RSA 2A aa ASADO Is ad RR SAA Sd OS OA SiS 96 Multisdrop ConmectioAS usa ato cab adobo 96 AS aa dan tada aaa td taa 97 MUR darop CONNECH ON Susa taa id taa 97 PI O ES A A Ona 97 ProoramimMming CabIC ll lnc naa osos 98 DAVE Setas tadas AS A aa 98 A A eek ee eer 100 OZ tesina it Dutti claras mala heen Daba ooo aa 100 O o a e ag a e e e e loe eB a e elo 100 A O E ocurheirbeila dE ob E a eaten a Mei tha mie 101 ED INGICAEO rai atra ve 102 USAS lr da DO 103 Appendix A CallDracion cara RAN 104 BOSE DIECllCGS O A o elos aun airs eee cd 104 Table Carat Medida 104 Mon CS Cala ao a a NI a an o E ii 104 West dias ia o a ias as ol Es lid 105 O O NEO 105
72. et to 80 samples per second 0 20 samples per second 1 10 samples per second 2 5 samples per second 3 2 5 samples per second 4 1 25 samples per second 5 1 6 seconds per sample 6 3 2 seconds per sample 7 80 samples per second OPL 19999 0000 Output Low display point for minimum Analogue Output OPH 19999 0000 Output High display point for maximum Analogue Output dP 0 5 0002 Decimal point position CP 0 133 0000 Communications protocol 0 127 Printer functions 128 Mantrabusl 131 Mantrabus2 132 Modbus RTU 133 MantraASCII2 Followed by power cycle to implement change SdSt 0 254 0001 Serial Device Station number bAud 115 2 Baud rate Selection table 2400 2400 baud 4800 4800 baud 9600 9600 baud 19200 19200 baud 38 4 38400 baud 57 6 57600 baud 76 8 76800 baud 115 2 115200 baud item Range Default Description LAb 0 84 0000 Label units for Printer See Using a Printer or Remote Display Ln 0 19999 0000 Log Number rs 0 19999 0000 Display Resolution This value sets the block size that the optional LCD display will increment and decrement by Page 13 LCA20 User Manual 517 182 Revision 1 4 Password Level 2 Password level two reveals the parameters associated with the analogue signal path and default display in addition to the above FStP 0 255 0000 RC Filter Steps FLVL 0 19999 0000 RC Filter Dynamic Level SEnS 0 5 3 Load cell sensitivity 0 5 3 0 5 to 3 7 mV V range 3 7 7 3 7 to 7 8 mV V range
73. ether with individual In Flight compensation Both the relay and the Analogue Output have a high level of electrical isolation A communications module is available as an option and enables RS232 RS422 or RS485 connection to a printer PC or PLC thus allowing the measurement values to be viewed and any configuration parameters changed Baud rates between 2400 and 115200 are available Internal parameters can be set digitally in real engineering terms by means of an optional plug in programmer unit or integral display module Various power supply options are available 220 240V AC 110 120V AC and 9 32V DC The LCA20 is also available in IP65 die cast and stainless steel cases for harsh environments while the LCB20 is a PCB only Eurocard version for customer s own enclosure Backwards Compatibility One of the design criteria for the LCA20 is that it should look and feel the same and be backwards compatible with the LCA15 wherever possible Existing users will find the same basic menu structure overall functionality and plug in modules with the exception of the communications module that they are familiar with Page 5 LCA20 User Manual 517 182 Revision 1 4 New Features The main change is with the microprocessor Using the latest RISC technology the number of support components required by the processor is reduced and allows the device to run faster giving more processing power New features are made possible such as programming th
74. f it is necessary to return the product to Mantracourt please include a note stating name company address phone number and a detailed description of the problem Also please indicate if it is a warranty repair The sender is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit Mantracourt warranty does not apply to defects resulting from action of the buyer such as mishandling improper interfacing operation outside of design limits improper repair or unauthorised modification No other warranties are expressed or implied Mantracourt specifically disclaims any implied warranties of merchantability or fitness for a specific purpose The remedies outlined above are the buyer s only remedies Mantracourt will not be liable for direct indirect special incidental or consequential damages whether based on the contract tort or other legal theory Any corrective maintenance required after the warranty period should be performed by Mantracourt approved personnel only TE ISO 9001 Designed manufactured and supported in the UK REGISTERED FIRM In the interests of continued product development Mantracourt Electronics Limited reserves the right to alter product specifications without prior notice DESIGNED amp MANUFACTURED IN THE UK Page 132 LCA20 User Manual 517 182 Revision 1 4
75. functions such as ON OFF control and alarm indications The relays are activated by the values programmed for the Set Points Module Functions The LCA20 can be programmed so that the relay output module reacts to all or any of the following functions e Source for relay such as Gross Net Peak Valley and Snap e Setpoints e Inflight compensation e Hysteresis e Relay inversion e Relay latching The two relays provide Single Pole Change Over SPCO contacts and are rated at 240VAC at 5A The connections are shown below LR1 Relay Module Source For LCA20 mode the source value for each relay can be selected from the following values Net Gross Peak Valley and Snap Setpoints Setpoints are used to produce relay signals at any required value so that the operation of the monitored process can be maintained to pre set levels Any excursion beyond the Setpoint s will normally activate the relay or relays to provide an alarm or initiate control as required Two relays can be programmed to suit different applications The actions of either or both relays can be inverted if required For normal operation the relay is energised until the input reaches the Setpoint level In this condition when the input value is less than the Setpoint the setpoint LED is on and the output relay is energised producing a closed circuit on a normally open contact When the Setpoint value is reached the setpoint LED turns off and the relay is de ener
76. g to the installation and setting up of the LCA20 General connection and setup parameters No display on power up e Check supply is present at the LCA20 terminals e f supply is correct contact distributor Display shows 1 or 1 continually without a weight applied to the Strain Gauge e Check input connections to the LCA20 from the Strain Gauge e f connecting a 4 wire device ensure terminals 1 amp 2 and 5 amp 6 are linked e Check Strain Gauge output between input terminals 3 amp 4 of the LCA20 e Check that the CALH weight is applied and is not the same or lower than CALL Display over ranges 1 or 1 when or before the maximum required weight is applied to the Strain Gauge e Check that the Sensitivity parameter is set to the appropriate range in the menu Display very noisy e If using a 4 wire device ensure terminals 1 amp 2 5 amp 6 are linked e Check output voltage of Strain Gauge Display operating in wrong direction e Check connections to input terminals 3 amp 4 are correct way round e Check the type of Strain Gauge compression or tension Unit will not auto calibrate e Check that CALH is not zero and its weight is greater than CALL e Check that input is not over ranged on CALH weight Relay module incorrect relay operation e Check setpoint in flight and hysteresis values are correct e Check latching and inversion settings are correct e Check connections to output terminals No communications e Ch
77. gised producing an open circuit on a normally open contact For an Inverted operation the reverse operations apply Page 115 LCA20 User Manual 517 182 Revision 1 4 Normal and inverted action is determined by the direction of the input value as it changes A High High operation allows for a rising input value to operate on two relays to define an acceptable quantity weight or band of operation A Low Low operation operates on a falling value A High Low operation will operate on a rising or falling value setting a band by one relay operating normally and the other being inverted Inflights The setting of an Inflight value causes the relays to automatically adjust to control the flow of the material being weighed For example if a relay is used to control a flow a certain amount of product will be Inflight between the supply point and receiving point causing a positive error when the required weight Is reached The Inflight compensation value is adjusted by the user to reduce the Setpoint value to prematurely stop the flow allowing the Inflight amount to make up the required total set by the associated Setpoint Hysteresis When Hysteresis is applied to relays with normal output action the input is allowed to rise to the Setpoint value and the relay is then turned off The relay is held off until the input value has dropped to the Setpoint minus the Hysteresis value For inverted action the input drops to the Setpoint and the
78. gram symbol flashes Page 26 LCA20 User Manual 517 182 Revision 1 4 O Always ensure that the programmer indicator is flashing even though the displayed value may not need to change 5 If the required value for CALL is already displayed then move onto to the next step else enter the desired value that the input on the current load cells represents 6 Ensure that the Strain Gauge has remained settled and is free from disturbance and press the 9 key to capture and calibrate the CALL value 7 If the CALH calibration point is to be done at a later date then the R can be pressed and the values for CALL will be committed to memory Else proceed to calibration high point CALH by pressing the 9 8 Apply the input to the load cells that represents the calibration high point CALH and allow to settle 9 Press the gt key and check that the program symbol flashes O Always ensure that the programmer indicator is flashing even though the displayed value may not need to change 10 If the required value for CALH is already displayed then move onto to the next step else enter the desired value that the input on the current load cells represents 11 Ensure that the Strain Gauge has remained settled and is free from disturbance and press the R key to capture and calibrate the CALH value and also commit these the values to memory 12 On the display returning to indicating the load cell value and assuming the load
79. he required command e Access Code Defines what sort of response is expected means write data Is expected to follow means the host is expecting to receive read data back lt CR gt i e nothing more before end means the command is an action type e Data An ASCII decimal formatted number can include 0 9 and spaces This field can have a maximum length of 15 characters It is important that data sent to the device does not exceed ignoring the decimal point position values greater than 32767 or less than 32768 otherwise the internal storage of these values will be corrupted e End of frame A lt CR gt is always present to indicate the end of the message Summary e Acommand message begins with followed by a three digit station address then a and finishes with a lt CR gt e The and lt CR gt only appear at the beginning and end of commands respectively Page 2 LCA20 User Manual 517 182 Revision 1 4 e From the to the final lt CR gt is the command instruction of read write or execute type e All instructions begin with an alphanumeric command identifier of up to 4 characters and end with a non alphanumeric which may be the final lt CR gt Slave Response Message Formats Each slave monitors the bus for command messages It responds to any message that is addressed to it by sending a response message To be accepted by a slave device a message must st
80. heir baud rate station number or protocol O If you cannot get physical access to the LCA20 to power cycle or to push the button you can connect manually by clicking the Manual Connect text on this page See Appendix G Manual Connect Page 30 LCA20 User Manual 517 182 Revision 1 4 O If an RS485 bus is used the Toolkit can be operated when any number of LCA20 modules are connected to the bus but they must have already been allocated unique Station Numbers If you have a group of modules straight from the factory they will all be allocated station number 1 by default so must be attached to the bus one at a time connected to the Toolkit and their station number changed If one or more modules are detected they will be displayed in the main list To connect to a module highlight it in the list and click the Connect button or just double click on the required module in the list LCA Toolkit Home Select COM Port The software can detect modules connected to an RS232 or RS485 port First select a COM port Power off the module s Click the Detect button Apply power to the module s COM2 MENS Detected Modules Model LCB20 Serial Number 999999999 Station 253 Baud 115200 Advanced Calibration Manual Connect No module selected Connect LCA Toolkit Version 0 0 25 O If more than one module is detected the software will also check that all the modules are set to the correct baud rate If
81. here are two types of programming modules available Both have 4 keys for menu navigation and a 4 digit LCD display The LP1 is an On board programmer which is permanently fitted to the LCA20 The LP2 is a hand held programmer that can be used to setup and calibrate the LCA20 and then removed leaving a blind amplifier controller Both fit into the FCC68 6 way connector marked on the PCB asJ 8 JO O LP1 The on board programmer is fitted by first connecting the FCC68 6way connector and then pushing the four nylon pillars into their respective holes on the LCA20 PCB care must be taken not to damage any of the surrounding surface mount components when doing this LP2 The handheld programmer comes with 2m of cable Power should be switched off before the connector is inserted or removed Page 83 LCA20 User Manual 517 182 Revision 1 4 Power Supplies There are two choices of power supply available the LS1 is for mains powering and the LS3 for DC powering Both power supply options provide isolation between the incoming supply the load cells and digital inputs and to the analogue output The power supplies provide the following nominal voltages Power supply monitor 12V unregulated 1 Logic and Load cell excitation V 2 Additional Relay supply 5V 3 Common for above supplies OV 4 Not connected Not Applicable 5 Analogue output 24V unregulated 6 Analogue output 5V 7 Analogue output common OV 8 Note Pin 1
82. ibration Low display value for low calibration point Calibration High display value for high calibration point Auto Tare value Value added to Gross to give Net Zero Tracking Band System Zero Serial Port menu Communications protocol requires a power cycle 0 127 Printer functions 128 Mantrabusl 131 Mantrabus2 132 Modbus RTU 133 MantraASCll2 Serial Device Station number bAud 1 115 2 Baud rate Selection table 2400 2400 baud 4800 4800 baud 9600 9600 baud 19200 19200 baud 38 4 38400 baud 57 6 57600 baud 76 8 76800 baud 115 2 115200 baud LAb 1 0 84 0000 Label units for Printer See Using a Printer or Remote Display Ln 1 0 19999 0000 Log Number dIPS 2 Digital input menu dIP1 2 Prnt Digital Input 1 function At Perform Tare Lr Latch Relay Reset Prnt Do Print dEFt Display Default display set by ddiS GroS Display Gross value nEt Display Net value PEAK Display Peak value VALY Display Valley value SNAP Display Snap Held value PV r Peak amp Valley Reset SCon Shunt Cal On SCoF Shunt Cal Off SCtG Shunt Cal Toggle on off dSnP Do Snap Hold current value dIP2 2 Lr Digital Input 2 function At Perform Tare Lr Latch Relay Reset Prnt Do Print dEFt Display Default display set by ddiS GroS Display Gross value nEt Display Net value PEAK Display Peak value VALY Display Valley value SNAP Display Snap Held value PV r Peak amp Valley Reset SCon Shunt Cal On SCoF Shunt Cal Off SCtG Shunt Cal Toggle on off d
83. ill be necessary to determine Output Low and Output High scale factors by graphical or mathematical means if the known source values do not coincide with the minimum and or maximum analogue output Page 117 LCA20 User Manual 517 182 Revision 1 4 Max 19999 OP HI 6500 Output scaled over the complete display range ie OP HI 19999 OP LO 19999 ss OP LO 1000 Output scaled over the desired display range ie Display OP HI 6500 OP LO 1000 Min 19999 Analogue Output Min 4mA Max 20mA Method of Calculating Output Low amp Output High from known output values Display Span Low Output Min output Output Low Low Display j aa High Output Low Output Display Span Max Output High pp Output High High Displa p g g p val High Output Low Output Where Low Output Required analogue output at low display value High Output Required analogue output at high display value Min Output Lowest value of analogue output 4mA or OV Max Output Highest value of analogue output 20mA or 10V Display Span Required High display value minus required Low display value Example To scale the output from 6mA at a display value of 400 to 18mA at a display value of 1100 Display Span 1100 400 700 x Output Low 400 PS 18 6 1400 Output Low 400 Gon 12 J 400 116 66 Output Low 283 33 OutputHigh 1100 A 18 6 OutputHigh 1100 Cow 1100
84. internal surface of the lid of the case O Where mains voltages are connected to the LCA20 then the unit must be suitable earthed This case has no surface mounting holes provided 223mm 163mm 6 x IP Glands for Cable Size 4 5 to 7mm Case Depth 90mm Page 80 LCA20 User Manual 517 182 Revision 1 4 LDC Die Cast Case The LDC is an optional Die cast enclosure suitable for more industrial applications This unit has 6 plastic cable glands of which 3 have sealing plugs fitted In the bottom of the box is a fibreglass base plate for mounting the LCB20 The lid has a tapped hole for earthing the lid to the base Where mains voltages are connected to the LCA20 then the unit must be suitable earthed Similar to the LAC this case has four mounting holes which allow the unit to be fixed to a surface whilst maintain the IP rating a 219mm E Y 204mm l o us l 4 MOUNTING HOLES 8 0mm 118mm 82mm 6 x IP Glands for Cable Size 4 5 to 7mm Case Depth 80mm Page 81 LCA20 User Manual 517 182 Revision 1 4 D2 DIN Rail This DIN rail mounting option accepts a LCB20 board assembly for Top Hat type DIN rails If these parts are purchased separately then the copper parts of the LCB20 board fingers require cutting off 162mm 3 107mm Max height above DIN Rail Mounting surface 100mm Fits ALL carrier rails DIN EN 35 Page 82 Revision 1 4 LCA20 User Manual 517 182 Connections Programmer Modules T
85. ired analogue output value for There are one of these for the low level and one for the high level Required Output Value Is Enter the required analogue output value for the input value you have specified There are one of these for the low level and one for the high level Calculate Click this button to calculate new Output Low and Output High values based on the information you have entered Page 40 LCA20 User Manual 517 182 Revision 1 4 Advanced Trimming Tab Sometimes when the analogue outputs are correct the device you are feeding the analogue output into does not because of inaccuracies in that device read the correct value The gain and offset virtual knobs allow you to tweak the gain and offset of the analogue output to achieve fine control rather than perform measurements and recalculate Output Low and Output High Values Also tweaking the gain and offset is the only way to push the analogue output past the min and max values OV 4mA and 10V 20mA LCA Toolkit s n Analogue Output AED A OR Output Select Source Help 4 20mA Peak This page allows you to configure the analogue outputs Advanced Trimming Once the analogue output has been setup it may be found that the device that this feeds into may need adjustment of the analogue output to take it beyond its calibrated limits Use these controls to fine tune the output Gain Offset Output Low 90 103 1000 1000 Output High 0 962500 0 000000 Defa
86. issa 23 bit fraction with implicit 1 The value of the number is thus 1 y Exponent 127 1 Mantissa y Page 66 LCA20 User Manual 517 182 Revision 1 4 Note the assumed 1 before the mantissa The exception to this is the special value 0 0 which is represented as 4 zeroes So a floating point number of 12345 678 is represented as OxC6h Ox40h OxE6h OxB6h This is represented in nibble format as Ox0Ch Ox06h Ox04h Ox00h Ox0Eh Ox06h Ox0Bh 0x06h End of Data Identifier As the protocol has no fixed length or length identifiers the last nibble of data sent to the device has its MS nibble set This indicates to the module device that all data has been received amp the next two bytes will be checksum data So the above data with MS nibble set would read Ox0Ch Ox06h Ox04h Ox00h Ox0Eh Ox06h OxOBh 0x86h This does not apply to the response from the module as the master knows how many bytes to expect in the reply to each of its commands ACK amp NAK Mantrabus2 supports ACK and NAK sending ACK 0x06h at the end of a successful operation and NAK 0x15h for an unknown command or failed operation These are always preceded by the station number see examples below O Mantrabus2 will not transmit a NAK for invalid checksum data but instead remains silent This is different from the behaviour of the older Mantrabusl Writing to Parameters Station number and command number are followed by 8 b
87. ith up to 10mA being available from the 0 10V output Analogue Output Force Count ranges from approximately 1160 to 9055 for the 4 20mA range and 1180 to 9150 for the 0 10V range with one digit representing 2 03uA and 1 254mV respectively Page 119 LCA20 User Manual 517 182 Revision 1 4 Appendix E Digital Inputs Overview The LCA20 has 3 Digital inputs These inputs are volt free which require either a contact closure or open collector type output which connects the particular input to the terminal marked OV The input has an internal 1000 Ohm resistor pulling the input to 5Vdc The input requires to be closed for a minimum of 300mS due to the de bounce circuitry Note that these inputs are not isolated from the load cell input WARNING Do not apply voltages to the digital inputs The three Digital inputs can be individually configured to provide the following functionality Digital Input selection table Perform Tare Perform a tare action Latch Relay Reset Reset any latched relays Do Print lf the Communications Protocol s set for Printer output then an ASCII string will be sent from the serial port Display Default display Switch the display to the original display source value Display Gross value Switch the display to Gross value Display Net value Switch the display to Net value Display Peak value Switch the display to Peak value Display Valley value Switch the display to Valley value Display Snap va
88. ld be set to the same protocol Station Number When using multiple modules on a suitable communications bus such as RS485 each module must have a unique Station Number to allow communications to work Here the module station number can be selected Baud Rate Select the required baud rate for the module All modules on the same communications bus should be set to the same baud rate O The module will require power cycling to enable changes to any of the above settings The Home button should be clicked before power cycling the module as the Toolkit will not be able to communicate if the module is power cycled while left on this page Page 45 LCA20 User Manual 517 182 Revision 1 4 Digital Inputs 42 Allows the function of digital inputs to be set and indicates the current state of the inputs LCA Toolkit Digital Inputs ADE RO Digital Input 1 Digital Input 2 Digital Input 3 Help This page allows you to save the configuration of the display Action Action Action Relay Reset Zero AT State State State LCA Toolkit Version 0 0 25 LCB20 Module serial number 999999999 set as station 253 on COM2 For each of the three digital inputs the following settings are available Action Select the action to execute when the digital input is activated State Indicates the current state of the digital input See Also Appendix E Digital Inputs for more information Page 46 LCA20 User Manual 517 182 Revisi
89. lkit Version 1 0 5 COM Port Select the COM port that the LCA20 is connected to The drop down list will be populated with all detected Com ports Baud Rate Select the baud rate that the module is configured to use Station Number Select the station number the module is configured as Back Button Go back to the Home page Connect Button Attempt to connect to the specified LCA20 module If successful the Information page will be displayed Page 123 LCA20 User Manual 517 182 Revision 1 4 Specifications Electronics Loadcell Input Strain Gauge Excitation System 6 Wire Strain Gauge Excitation Voltage 4 75 5 0 5 25 V Strain Gauge Drive Capability 35 ohms Strain Gauge Sensitivity Range 1 3 7 mV V Strain Gauge Sensitivity Range 2 8 mV V Offset Stability 2 5mv V FS 2 ppm C Gain Stability 4 ppm C Offset Stability With Time 3 ppm FR Gain Stability With Time 1 Year 6 ppm FR Integral Non Linearity Before 10 ppm Linearisation Internal Resolution 1 1000 000 20 Resolution Bits 10hz Noise Free Resolution 1 180 000 17 5 Resolution Bits 80hz Noise Free Resolution 1 130 000 17 Resolution Bits Analogue Output Current Output 4 20 mA Current Output Drive Capability 1 K Ohm Voltage Output 10 V Voltage Output Drive Capability 5 K Ohm Phase Delay Sine Wave 55 ms 3db Down Point 8 5 Hz Phase Delay Step Change 26 ms Rise Fall Time 10 To 90 FR 40 ms Rise Fall Time 1 To 99 FR
90. ls 7 mbar 36 YDev 65 mins 8 kPa 37 W 66 litres 9 atm 38 kW 67 knots 10 mmHg 39 MW 68 S 11 inHg 40 pH 69 hours 12 inH20 41 ppm 70 Nm 13 cmHg 42 uS 71 PSI 14 mm 43 Ohms 72 g 15 Wh 44 m s 73 Counts 16 dB 45 ft min 74 P 17 tonne 46 RPM 75 Chan 1 18 m 47 RPMx10 76 Chan 2 19 in 48 RPMx100 77 Chan 3 20 ft 49 cos 78 Chan 4 21 degrees 50 km h 79 Chan 5 22 L s 51 ms 80 Chan 6 23 L min 52 RPM1000 81 Chan 7 24 L h 53 Hz 82 Chan 8 25 gals s 54 kHz 83 Chan 9 26 gal min 55 V DC 84 Chan 10 27 gal h 56 mV DC 28 RH 57 A DC Page 6 LCA20 User Manual 517 182 Revision 1 4 Format of Output String The ASCII String for both Printer and continuous output is in the same format and is shown below for the following settings CP 1 dP 3 Lab 30 00159 100 23 Kg lt CR gt lt LF gt O In the above example the length of ASCII string will vary with the choice of Label For a continuous ASCII output to a large LED display which does not require a Line Feed Character lt LF gt and where no Log Number Ln or Label LAb is required CP 70 dp 2 Lab 0 10 023 lt CR gt Page 77 LCA20 User Manual 517 182 Revision 1 4 Installation Mechanical LCB20 Board Module The LCB20 is the PCB only element of the LCA20 The board can be bought and fitted to OEM products or a customer particular case Care should be taken when installing the PCB to ensure good ESD precautions are taken and to also ensure against risk of electrocuti
91. lue Switch the display to Snap value Peak amp Valley Reset Reset the peak and valley capture values Shunt Cal On Turn Shunt calibration on The Shunt Calibration Value available over the communications bus and optional display will show 100 if integrity of load cell and wiring is OK and the Shunt Calibration value has been calibrated See Using the LCA Toolkit Software Calibration Shunt Calibration section of the manual for more information Shunt Cal Off Turn off shunt calibration Shunt Cal Toggle on off Toggle between shunt calibration on and off Do Snap Store the current value of the snap source to the snap value Page 120 LCA20 User Manual 517 182 Revision 1 4 Appendix F Security Locking By default the LCA20 arrives from the factory unlocked in terms of requiring changes to hardware to gain access to certain functionality Menu Passwords Access to menu sections using the wired handheld programmer display is controlled by passwords The user is asked for a password and depending on the password entered gains access to the appropriate section and all sections beneath These passwords are fixed as follows Level 1 Password 1111 Operator Level 2 Password 2111 Engineer Level 3 Password 3111 Advanced Calibration Configure Handheld Display Calibration Lock There is also a hardware link on the main board that if removed will hide the CALL CALH ADCL ADCH and SENS parameters from the handheld menu and thus preven
92. m Mantracourt or can be purchased from Farnell or RS Please see the following information Manufacturer FTDI Chip http ftdichip com Part number TTL 232R 5V Supplier RS 687 7770 Driver http www ftdichip com Drivers VCP htm O A driver may need to be installed for the PGM1 cable to work correctly This will create a virtual RS232 serial port COM Port which your own software or the LCA Toolkit will connect to Driver Settings If you are using the communications to read or log data at high speed This includes viewing the Trend Chart using the LCA20 Toolkit you may find the desired speed is unachievable even with high baud rates This could be due to the default settings of the Latency Timer Open the Control Panel and launch the Device Manager Page 98 LCA20 User Manual 517 182 Revision 1 4 Once Device Manager is open you need to locate the virtual COM port assigned to this interface This will be listed under the Ports COM LPT section of the hardware tree You may need to unplug and re attach the interface cable from the computer to identify which entry to use a Ports COM amp LPT sen 1 Communications Port COM1 2 USB Serial Port COM2 Double click the item to open the Serial Port Properties dialog window 1450 E arial m oo TR ee ree e 7 oh PN ALETI Cine i SE Serial Port COM in A q i al t r y MZ om je General Port Settings Driver Bits per second Data bits Party
93. mA or 10V Value This shows the current selected source value Calculated Analogue Output Shows the calculated analogue output for the current input value Note that this calculated value may be beyond what the output is capable of providing Page 39 LCA20 User Manual 517 182 Revision 1 4 Automatic Tab If you do not know what input value relate exactly to the minimum and maximum analogue output levels but you do know the input values for other output values use this tab LCA Toolkit _ Analogue Output oF IW Output Select Source Help 4 20mA Gross This page allows you to save the configuration of the analogue Manual EMULE Advanced Trimming When the input values that are represented by the lowest and highest analogue outputs are not known but there are two points at which the input and the required corresponding analogue outputs are known then these can be entered here and the Output Low and Output High values will be calculated output Output Low At Input Value Required Output Value Is Output High At Input Value Required Output Value Is 0 000000 0 000000 Calculate Inverted ES LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 25 Output Low Shows the new Output Low value after you click the Calculate button Output High Shows the new Output High value after you click the Calculate button At Input Value Enter an input value that you know the requ
94. n the Display Averaging parameter and the digital low pass filter parameter Filter Steps The block averaging is bypassed if Display Averaging parameter is set to 7 or the Filter Steps parameters is non zero Block averaging simply adds a number of results together then divide the result by the number of results added Known as the mean For Display Averaging values of 0 6 the number of result to average is calculated as 2 to the power of Display Average 2 Once a new block average value is ready the Filtered ADC Counts value is updated and the process continues 3 The Filtered ADC Counts Value is then converted using the factory calibration to a mV V value to within 0 05 accuracy 4 This mV V value is then tested to see if in fact the input has been over or under ranged and if so an internal input over or under range flag is set that is checked later in the process see 8 5 The current mV V value is then converted into the user desired engineering units using the 9 point linearization programme This programme searches the mV V levels for each point to find what Gain and Offset values to apply The number of points to search through is set by the Number of Calibration Points parameter If the current mV V is above or below the last or first mV V table level then the gain and offset values to be used are extrapolated from the last or first two points When the 2 point Auto Calibration routine is used the same principle applies The
95. n the LCA20 non volatile memory If during the programming sequence selection is not completed the display will revert to showing the input variable after 2 minutes and any changes made will not be saved O If on pressing the 9 or R keys after a new value has been entered that is outside the allowed range for that parameter then Err will be displayed until the 9 or R keys is pressed again Pressing the R key will exit the menu restoring the last good value to the parameter Pressing the 9 key will show the parameters mnemonic again followed by the last good value Menus A series of parameters or programmable functions are provided in the LCA20 to allow the user good flexibility for monitoring and control applications These parameters are held as constants in the LCA20 s permanent memory and are accessed and checked via the programmer keypad or the communications port Data which is entered by the user is retained in EEPROM for up to 10 years without back up power New data when entered overwrites previous entries when the R key is pressed unless the EEPROM has been disabled via the communications port Page 9 LCA20 User Manual 517 182 Revision 1 4 Password Protection To enter the menu a 4 digit password number must be entered when PASS is displayed The factory set number 1111 allows access to the most common parameters Additional passwords are required to gain access to the remaining two levels Page 10 LC
96. nal LCD display will show 1 with no other digits shown Overrange Value Enter the engineering unit value of the Gross value above which the overrange flags will be set The output value will change to 20001 with the decimal point as defined above The optional LCD display will show 1 with no other digits shown mV V Input The mV V value measured at the input Calibrated Value The mV V value after having the calibration applied Units Optional 6 characters of units that will be displayed on the main Information page Page 47 LCA20 User Manual 517 182 Revision 1 4 The following sections will deal with each of the tabs available on the calibration page Automatic Tab Select this tab to calibrate the module by applying known loads O Each time you enter this page it will hold the last data entered or will be blank ready to accept values e The page is used to generate the calibration data seen in the Advanced Tab but does not reflect any data held in the module LCA Toolkit dE Calibration be dE SO E RA OR Input Sensitivity Decimal Point Mode Help 0 5 to 3 7 mV V y 199 99 v LCA15 Legacy v This page allows you to calibrate the module Automatic Shunt Calibration Cal Info Somme rta applying known weights or by Automatic calibration allows calibration by the application of known weights entering values from the load cell calibration certificate Measurement Points 2 fou can also calibrate the shunt v calibr
97. nse to Commands 3 to 22 above Command 21 Auto Tare DATA transmitted to LCA20 for Command 21 OxFFh Serial Device Station number 0x95h Checksum Where Checksum Serial Device Station number XOR with 0x95h Example To output an Auto Tare command to an LCA20 whose Station Number is set to decimal 47 The data transmitted by the master would be OxFFh Ox2Fh 0Ox95h OxBAh Note MS BIT SET For response by LCA20 see Response to Commands 3 to 22 above Command 22 Peak Hold Reset DATA transmitted to LCA20 for Command 22 Page 64 LCA20 User Manual 517 182 Revision 1 4 OxFFh Serial Device Station number 0x96h Checksum Where Checksum Serial Device Station number XOR with 0x96h Example To output a Peak Hold reset to an LCA20 whose Serial Device Station number is set to decimal 47 The data transmitted by the master would be OxFFh Ox2Fh 0x96h OxB9h Note MS BIT SET For response by LCA20 see Response to Commands 3 to 22 above Page 65 LCA20 User Manual 517 182 Revision 1 4 MantraBus2 MantraBus2 is selected by setting the Communications Protocol equal to 131 Mantrabus2 is a two wire protocol which allows data to be transmitted amp received over a common pair of wires Communications traffic is synchronised by using a unique 8 bit framing character For this reason the framing character must not appear as data in a command or reply from the responding LCA20 The protocol ensures this does not occur by splitting da
98. nst the source selected by the Peak Selection parameter which could select either Gross or Net values 12 The Valley value is checked against the source selected by the Valley Selection parameter which could select either Gross or Net values Zero Tracking Zero tracking is applied to the Gross value A Tracking Band parameter sets a band about the Pre Gross absolute zero value If a Tracking Band parameter has a value of 10 0 then the band Is calculated as between 10 0 and 10 0 If the Pre Gross value is in between these two calculated values for more than 1 second then the value of Pre Gross is stored as the new zero tracking value This Zero Tracking value is then subtracted from the Pre Gross value to give a Gross value of zero Zero Tracking can be disabled by setting the Tracking Band Parameter to zero The Zero tracking value is volatile therefore reset to zero on power up System Zero System Zero is used to remove permanent values from an installed system such as the weight of a vessel or weighing platform to give a zero Gross value The System Zero parameter is then added to the Calibrated value to give an intermediate internal value known as Pre Gross Value Auto Tare The Auto Tare facility enables the generation of the Net value The Net Value is calculated as the Gross value added to the value set in the Auto Tare parameter An update of the Auto Tare value can be commanded from a digital input or from the communications por
99. nutes to allow the electronics and load cells to stabilise e Set the Sensitivity and Decimal Point Parameters before calibrating e For multi point linearization calibration we recommend the use of the toolkit as this simplifies the process e The best calibration is achieved by using the complete system using actual known weights e When using the multi point linearization load the complete system in increments that allow a graph of non linearity to be plotted From this graph the best point can be determined for the calibration points e When multiple load cells are connected together in parallel ensure that they have equal mV V outputs Alternatively use an Active J unction module such as a J BA Table Calibration Method If the load cell manufacturer s calibration certificate is available then it is possible to calculate gains and offsets that can be entered into the linearization table parameters A simple way of achieving this is provided by the LCA Toolkit The LCA Toolkit s Calibration Advanced Tab is where you can view the actual linearization table parameters from either the Auto Cal or Table calibration methods mV Source Calibration If the load cell manufacturer s calibration certificate is available an alternative calibration method is to use the Automatic calibration method but instead of using the load cells and test weights a mV source can be connected as shown below can be used to calibrate the LCA20 instead Vref
100. od value Menus When in LCA20 mode the menu system operates with multiple levels to allow easier navigation round the parameters Different levels and parameters being made available depending on the Page 18 LCA20 User Manual 517 182 Revision 1 4 password level entered There are 3 password levels which can be considered as Operator Engineer and Configurator Calibrator Password Protection To enter the menu a 4 digit password number must be entered when PASS is displayed The factory set number 1111 allows access to the most common parameters Additional passwords are required to gain access to the remaining two levels Menu Tables In the table below the hierarchal level of menu items is indicated by a prefix dot PASS tYPE VALS GroS nEt PEAK VALY SNAP mVV CALV rLYS rLY1 SP1 IF1 HYS1 InV1 Ltcl N NFP PPP Pe EF PA UU_ if a i a a LZ l J Q ser Manual 1111 19999 19999 0 19999 LCA15 0000 0000 0000 No No Security Password Correct value required to proceed further Selects mode of operation LCA15 LCA20 Restricted functionality as per the original LCA15 Full functionality of the LCA20 Values View generated live values Gross Net Peak Valley Snap Held Value mV V Calibrated Value Gross value before System zero Zero Tracking Relay Menu Relay 1 Menu Desired Set Point trip value for Relay 1 In Flight compensation for
101. odule In actual use the snap command would be a broadcast communications command to enable multiple modules to record values at the same time The snap value can then be retrieved from each module Display Shows the main value that Is indicated on the optional display Note that the actual value shown on the LCD may differ from this floating point value due to the Resolution parameter setting Display Source Select the source for the display value LCD Mimics the actual display that would be shown on the optional LCD display Resolution This parameter value sets the block size that the optional LCD display will increment and decrement by This setting does not affect anything other than the LCD display Page 44 LCA20 User Manual 517 182 Revision 1 4 Communications This page configures the communications interface for communication via other software The settings do not affect the ability of the Toolkit to connect to the module However at low baud rates it may not be possible to log data or update the chart page at the measurement rate of the module A higher baud rate will result in a more responsive experience with this Toolkit LCA Toolkit ai Communications E SDE hee OR Protocol Help Station Number Baudrate LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 25 Protocol Select the required communications protocol All modules on the same communications bus shou
102. of J 11 is at the end furthest in board LS1 Mains Supply The LS1 allows for powering of both 110 and 230VAC mains voltages and at frequency of both 50Hz and 60Hz The maximum power requirement is 10W The unit should be fused with a suitable device O If the LCA20 is housed in a metal enclosure such as LDC or LSS then the enclosure must be earthed in accordance with the relevant regulations O The cover plate supplied with the LS1 and LS3 must be fitted after connections have been made Fitting Module to Main Board The module fits to the main board by plugging the white connector on the underside of the LS1 module into J 11 on the main board One nylon pillar engages into a hole on the main board Three metal pillars are already mounted on the main board and the LS1 module should be screwed to these O The LS1 is shipped with a yellow link wire fitted ready for 230VAC operation Page 84 LCA20 User Manual 517 182 Revision 1 4 m pon ni HE ETATLE Supply Connections 97VAC to 120VAC 97VAC 120VAC 210VAC to 260VAC 7 210VAC 260VAC O D Page 85 LCA20 User Manual 517 182 Revision 1 4 LS3 DC Supply The LS3 accepts DC voltages from 9 to 32VDC The DC source must be able to supply a start up current of 3A for 20mS The power requirements once started is a maximum of 10W It is recommended that an anti surge fuse be used to protect the LCA20 O The cover pl
103. on 1 4 Calibration A The calibration page offers three ways to calibrate the module and also allows configuration of shunt calibration Wie Toolkit an Calibration LEESI Twa HOR Input Sensitivity Decimal Point Mode 0 5 to 3 7 mV V 199 99 LCA15 Legacy v Automatic Automatic calibration allows calibration by the application of known weights Measurement Points Applied Weight Applied Weight 1 Acquire _ J 0 000000 mV V Input Calibrated Value Underrange Value Overrange Value Units 10 00000 MN 35 00000 MM 1 999420 M 23 99140 LCA Toolkit LCA20 Module serial number 999999999 set as station 253 on COM2 Version 1 0 1 The Input Sensitivity and Decimal Point parameters should be decided on before calibration takes place Changing either after calibration may void that calibration Input Sensitivity Choose the appropriate range for the load cell sensitivity that is connected Decimal Point This setting determines the maximum range of the engineering units for the module This must be selected to allow for the maximum value likely to be encountered Mode Choose whether the programmer menu structure will be the same as the previous version LCA15 or whether it will contain newer parameter access for the LCA20 Underrange Value Enter the engineering unit value of the Gross value below which the underrange flags will be set The output value will change to 20001 with the decimal point as defined above The optio
104. on address in a command message is 000 this means a broadcast command All slaves act as normal on a broadcast command but do not respond Broadcast commands are either write or action commands Broadcasts commands DO NOT yield responses Example A command to all devices on the bus to sample their inputs using the SNAP command will look like this Page 74 LCA20 User Manual 517 182 Revision 1 4 000 SNAP lt CR gt There is no response Bad Commands If any command is not understood by the device then a is transmitted followed by a lt CR gt Example A unrecognised command correctly addressed to Serial Device Station 173 1173 XYWR lt CR gt produces the general error response lt CR gt The LCA20 will not send responses to the following e Unavailable station number e Data outside of limits Using a Printer or Remote display Printer selection is made when Communications Protocol CP is set between 1 127 Printer selection enables the LCA20 to print its selected display value ddiS to a printer via its communications port This display value can be assigned a log number Ln depending on the user set options entered under Communications Protocol CP The log number can be reset or pre set using the mnemonic Ln This number will increment on each trigger giving a unique printout number This number will reset to zero after 19 999 The value is not saved on power fail A label Lab can be app
105. on code Device ID A correct LCA20 response would then be Number of Registers Starting Register Function code Device ID Page 71 LCA20 User Manual 517 182 Revision 1 4 MantraASCll2 MantraASCll2 is selected by setting the Communications Protocol equal to 133 The ASCII protocol uses only printable characters and carriage return lt CR gt which allows a dumb terminal device or a PC programme like Hyper Terminal to interrogate the device Host Command Message Format The command request structure is shown in the following example illustrating the message write 123 45 to parameter Setpoint 1 SP1 on Serial Device Station number 1 AS eed eke Framing Station Separator Command Access Code Character Address Identifier 001 SP1 An explanation of each field is as follows e Framing Character A character is used to signal the start of a new message This character is only ever transmitted by the host for framing purposes End of frame 123 45 lt CR gt e Station Address A three digit ASCII decimal number 0 999 determining which slave device s the command is intended for All three digits must be sent Address 000 is reserved for broadcast addressing e Separator Always present As no checksum or message verification technique is used slaves use this as an extra check on message validity e Command Identifier Up to 4 alpha numeric characters case insensitive giving the name of t
106. on when mains powered or mains relay switching The PCB has four mounting holes suitable for M3 bolts 166 5mm 4x 3mm Mounting Holes 69mm 100mm 3 160mm Clearance above the top of the LS1 ac power supply 52mm Clearance above LS dc power supply 42mm Clearance above top LOB Board side view a of LP keypad 50mm Clearance below the board should be 3mm If it needs to be insulated allow amp mm Page 78 LCA20 User Manual 517 182 Revision 1 4 LAC ABS Case The LAC is an ABS case fitted with 6 off plastic glands which accept cable sizes from diameter 4 5mm to 7mm Three of these glands have sealing plugs fitted There are four mounting holes which allow the unit to be fixed to a surface whilst maintain the IP rating 200mm 4 188mm 4 MOUNTING HOLES 4 8MM 120mm 89mm 6 x IP Glands for Cable Size 4 5 to 7mm Case Depth 75mm LTL Transparent Lid The LTL is a clear perspex lid which is fitted to the LAC It is mainly used when the On board programmer LP1 is fitted to the LCB20 PCB Page 79 Revision 1 4 LCA20 User Manual 517 182 LSS Stainless Steel Case The LSS is an optional Stainless steel enclosure suitable for catering and pharmaceutical applications This unit has 6 plastic cable glands of which 3 have sealing plugs fitted In the bottom of the box is a fibreglass base plate for mounting the LCB20 An earth stud M6 x 16mm is provided on the base of the case with an M4 x 6mm on the
107. or based on a required change in mV V then the following formula can be used Rs 0 25 1000Rg AmV V 2Rg O The Resistor should be a 0 5 25ppm or better To remove the existing resistor from circuit cut the track as indicated below Fit a leaded resistor to the position shown Page 105 LCA20 User Manual 517 182 Revision 1 4 O The Shunt Calibration is for indication and integrity purposes and should not be used to perform calibrations from Using Shunt Calibration The Shunt Calibration facility allows a known value to be displayed thus allowing the integrity of the LCA20 load cell wiring and load cell to be checked The load cell input should be constant before and during this Integrity check The Shunt Calibration can be switched on off or toggled by a digital input It can also be commanded on and off from the communications port When Shunt Calibration is switched on the Status parameter will flag this and also flag that a Load Cell Integrity condition exists The LCD display will indicate this by the PGM Arrow segment being on When the Shunt Calibration is commanded to switch on but before the Shunt Calibration resistor is placed across the load cell the current mV V value is recorded in a Pre Shunt Calibration Value parameter This is used when calculating the Shunt Calibration Scaling factor parameter see following Required known value Post Shunt Calibration mV V Pre Shunt Calibration Value pa
108. ous stream Simple way of getting data into a PC The following table gives details of all LCA20 commands with brief details of each Commands in Access Order Software Version Read only VER 1 40003 Serial Number low byte Read only SERL 2 40005 Serial Number high byte Read only SERH 3 40007 Status Read only STAT 4 40009 A D Value Read only ADCF 5 40011 mV V Read only MVV 6 40013 Calibrated Value Read only CALV 7 40015 Selected Display Value Read only DISP 8 40017 Snap Value Read only SNVA 9 40019 Peak Read only PEAK 10 40021 Valley Read only VALY 11 40023 Net Value Read only NET 12 40025 Gross Value Read only GROS 13 40027 Pre Shunt Cal Value Read only PSCV 14 40029 Calibration Change Counter Read only CALC 15 40031 Shunt Calibration Value Read only SCVL 16 40033 Analogue Output Force Counts Read Write AOFC 17 40035 Snap Value Selection Read Write SNGN 18 40037 System Zero Read Write ZERO 19 40039 Parameter Flags Read Write FLAG 20 40041 Setpoint 1 Read Write SP1 21 40043 Inflight 1 Read Write IF1 22 40045 Setpoint 2 Inflight 2 Hysteresis Output Action Low Calibration Value High Calibration Value Auto Tare Display Averaging Low Analogue Output Value High Analogue Output Value Decimal Point Communications Protocol Station Number Log Number Display Resolution Low Calibration Value A D mV V High Calibration Value A D mV V Load Cell Sensitivity Measurement Rate Number of Calibration Points Calibration
109. pt at a firmware update will render the module inoperable until a valid firmware update has been achieved Page 34 LCA20 User Manual 517 182 Revision 1 4 Trend Chart This page allows you to view the module value on a scrolling chart The chart will hold 10 000 points of data and is updated at the update rate of the module Displayed at the top right of the chart This is determined by the settings on the Filters page The chart Y axis is auto scaling but you can select the view into a stored history of 10 000 data points J ust drag the handles of the range scrollbar under the chart to define the start and end point of the view The date and time of the first and last point on the chart are displayed in the lower left and right area under the chart By clicking in the chart you can display a cursor and the date and time at the point of the cursor also the data point value will be displayed underneath the chart LCA Toolkit Trend Chart of different filter settings 2 48322 0 993288 0 496644 O 20 03 14 09 44 29 LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 TUNES ASDE A OR This chart updates at the module measurement rate This is useful to view general data trends in real time or to see the effects Help The chart can hold 10000 points and you can use the control bar beneath it to set the start and end points of the chart view The Y axis of the chart is auto
110. r with the program indicator When in programming mode it should be noted that the first digit in the display may not be visible but the program indicator will flash to indicate that the instrument is in programming mode even though no digits can be seen to be flashing 4 Used to move up a menu level If already at the highest menu level PASS then the menu system will be exited returning to displaying the input variable When displaying a parameter value this key increments each selected display digit 0 9 Pressing the a key under programming conditions will display the leading digit as 1 1 or a blank display for zero Additionally for items that can be selected from a list such as the baud rate bAud then this key cycles through the available options The currently set value is the first shown data value R Resets the display to the input variable and enters new data in the LCA20 non volatile memory If during the programming sequence no key is pressed the display will revert to showing the input variable after 2 minutes and any changes made will not be saved O If on pressing the 9 or R keys after a new value has been entered that is outside the allowed range for that parameter then Err will be displayed until the 9 or R keys is pressed again Pressing the R key will exit the menu restoring the last good value to the parameter Pressing the 9 key will show the parameters mnemonic again followed by the last go
111. rameter Shunt Calibration Scaling Parameter 10 Note When Shunt Calibration is switched on the LCA20 values such as Gross Net Peak Valley ETC are also affected Consequently the Analogue out and relays are also affected Page 106 LCA20 User Manual 517 182 Revision 1 4 Appendix B Measurement Overview Read Write Parameter a Function a Read Only Parameter Analogue To Digital Convertor Sensitivity gt Measurement HI Rate 10SPS 80SPS Result is a signed 20 bit value If Filter Steps is zero or Display Averaging less Display Averaging than 7 then block average A D results until new result ready Filtered ADC Counts Convert 20 bit signed value to mV V mV V value Depending on ADC sensitivity setting check for mV V greater or less than 13 7mV V or 17 8mV V Status flag Input Over range or Input Under Apply from 2 up to 9 Range Number of points of linearisation Linearisation includes 2 point auto Points cal Linearisation Offset Points X 9 Linearisation Gain Points X 9 Linearisation mV V Point X 9 Calibration Point Auto Cal convert to Calibration Point Low linearisation points High Calibrated Value Page 107 LCA20 User Manual 517 182 Revision 1 4 system Zero Filter Steps Filter Level Overrange Level Underrange Level Zero Tracking Band Auto Tare Value Peak Source Valley Source Pre Gross value calibrated
112. ration procedure can be initiated by capturing CALH with a full hopper if the weight is known and CALL captured at a later date when the hopper is empty Please note that the LCA20 may not display the correct weight until the second data point Is acquired O The Sensitivity SEnS and Decimal Point position dP must be set before calibration takes place Procedure Allow a warm up period of 20 minutes before carrying out the calibration procedure If It is intended that the calibration is permanent then please ensure the EEPROM has not been disabled by the communications port See chapter The accuracy of the calibration depends upon the input being settled and stable This procedure is written assuming the low calibration point CALL is followed by the high calibration point CALH but note that CALH could be done first 1 With the load cells connected and the load cells settled at the low calibration point this could be the empty vessel Press the 9 key until PASS appears 2 LCA15 Enter the password 1111 using gt and a keys then press 9 key LCA20 Enter Level 2 password using gt and a keys then press 9 key 3 LCA15 Press the 9 key several times until CALL appears LCA20 Press the 9 key several times until ACAL appears Press the key to select and CALL appears O If CALL does not appear your LCA20 may be locked from calibration by your supplier 4 Press the gt key and check that the pro
113. s the load cells to be situated in the hazardous area whilst the LCB is in the safe area 6 wire connectivity must be used The example below uses Pepperl Fuchs isolated barriers KFD2 VR2 Ex1 50M is used to isolate the Output signal from the load cell KFD2 VR Ex1 18 is used to isolate the Sense connections KFDO SD2 EX1 1065 used to provide excitation for up to 4 350 ohm load cells Hazardous Area Safe Area Isolated Barriers Exc P F KFDO SD2 Ex1 1065 P F KFD2 VR Ex1 18 Fit Vref lin on LCA20 l A Power supply l P F KFD2 VR2 Ex1 50M i Because the barriers are fully isolated the Vref link MUST be fitted to ensure that the LCA20 input stage is biased correctly If galvanic isolation is NOT required passive non isolated barriers such as the MTL77xx series can be used instead In this case the Vref link should NOT be fitted Page 90 LCA20 User Manual 517 182 Revision 1 4 Digital Inputs The digital inputs are for switch contacts or volt free transducers such as relays Another common type that is suitable for the LCA20 digital inputs is a NPN open collector transistor The digital input internal circuitry has 1k ohm pull up with a 300ms de bounce filter The common of the digital input marked OV has a 47 ohm series resistor O The Digital Inputs are not isolated from the load cell input O Do not apply voltages to these digital inputs Connector Location Uki m O Connections
114. t Additionally an Auto Tare value can be entered into this parameter from the keypad or again using the communication port The Auto Tare parameter is non volatile and is therefore saved through power fail Filters Overview The least significant digits of the display or values over the communications port may change excessively in certain applications due to vibration or noise on the input Filtering can be applied to smooth the display by two methods The simple block average filter uses averaging and therefore generates new values at the Measurement Rate which is slower than the A D Measurement Rate The dynamic digital low pass filter uses software to generate new values at the A D Measurement Rate Page 110 LCA20 User Manual 517 182 Revision 1 4 Simple Block Averaging Block averaging delays the generation of a new output value until a number of new values generated at the A D Measurement Rate have been averaged This provides a very steady display or output but at the expense of a slow update rate The range of choices of the final update rate is dependent on the selected A D Measurement Rate A D Measurement Rate is set to 10 samples A D Measurement Rate s set to 80 samples per second per second 10 samples per second 80 samples per second 2 5 samples per second 20 samples per second 1 25 samples per second 10 samples per second 1 6 seconds per sample 5 samples per second 3 2 seconds per sample 2 5 samples per second
115. t calibration LK1 J umper Link On Calibration Visible LK1 J umper Link Off Calibration Hidden LK1 B J14 gt I 3 PT D1 LR D2 Page 121 LCA20 User Manual 517 182 Revision 1 4 LCA Toolkit Lock 8 LK2 on the main board controls access to the Lock page in the Toolkit When the jumper link is fitted all pages are visible including this Lock Page LCA Toolkit Lock A This page allows certain Toolkit functionality to be hidden when a user connects to this module This page is only available when the Enable Toolkit link is fitted All pages will also be accessible When the link is removed this page will not be available nor will the hidden pages and functions Calibration Page Relays Page Filter Page Analogue Output Page Digital Inputs Page System Zero Function On Measurement Page Communications Page Shunt Calibration Control On Information Page SH LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Certain pages and functionality can be hidden or disabled using this page Once the LK2 jumper link is removed and the module is connected to the LCA Toolkit this page and all other selected pages and functions will be hidden LK2 J umper Link On All Pages Visible LK2 J umper Link Off Lock Page amp Selected Pages Hidden OO Blk PT D1 LR D2 Page 122 LCA20 User Manual 517 182 Revision 1 4 Appendix G Manual Connect If you cannot get physic
116. ta bytes into 4 bit nibbles while the framing character amp station number remain as 8 bit bytes Framing Character The framing character for Mantrabus2 is OxFEh this is to differentiate it from the older Mantrabusl OxFFh to allow the two protocols to be mixed on one bus Checksum Both Host and Device send their XOR checksum of all data sent excluding framing character in nibble format with the MS nibble being first e g XOR Checksum of data is OxA7h Checksum characters sent as Ox0Ah and 0x07h Data Transfer Data is both sent and received as 4 bytes split into 8 nibbles following the station number plus two nibbles of checksum O It is important that data sent to the device does not exceed the maximum or minimum value which can be displayed by the LCD programmer For integer values this is between 19999 and 19999 for engineering unit s values this is determined by the decimal point position For example If the LCA20 has a Decimal Point position of 3 then the largest value that can be written is 199 99 and the smallest value is 199 99 Floating Point Data Format All data sent amp received in Mantrabus2 is in the IEEE floating point format this being a 4 byte floating point number The byte containing the sign amp exponent is sent first with the LS byte of the mantissa being last The memory layout of the 4 byte floating point numbers is MSB 31 Sign bit l1negate 30 23 Exponent 7 bit excess 127 LSB 22 0 Mant
117. te Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Read Write Command Command Command Command Command Command Command Command CMD COF6 COF COF8 COF9 AOSL AOIG AOIO AOVG AOVO BAUD LABL MODE EEPM DIP1 DIP2 DIP3 FFST FFLV DDIS RLS1 RLS2 ANOP HYS2 OVRV UNDV PVGN SCSF USR1 USR2 USR3 USR4 USR5 USR6 RST DOAT LCHR SNAP RSPV SCON SCOF DAEP ENER 66 67 68 69 70 71 12 73 74 75 76 11 78 79 80 8l 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 115 116 117 118 119 120 121 122 123 40133 40135 40137 40139 40141 40143 40145 40147 40149 40151 40153 40155 40157 40159 40161 40163 40165 40167 40169 40171 40173 40175 40177 40179 40181 40183 40185 40187 40189 40191 40193 40195 40197 40199 40231 40233 40235 40237 40239 40241 40243 40245 40247 Description Mantra ASCII Na me MANT RABUS2 MODBUS command RTU Enable the EEPROM from RAM CMD See following table for multiple option details ENRE Register 40249 O All Modbus accesses are in register pairs and 2 registers MUST be read Multiple Option Selection Table This table shows the available value options for certain parameters liste
118. te there is a load cell integrity issue or that Shunt Cal is switched on Unit Panel Layout i0 680 Page 8 LCA20 User Manual 517 182 Revision 1 4 LCA15 Legacy Mode For backwards compatibility with the LCA15 the traditional single level menu system has been maintained There are a number of small changes such as item selection using the a key Keys 9 Used to scroll through and change the set up data by displaying mnemonics for each configurable parameter followed by the appropriate data On reaching the end of the menu is displayed and the module commits any changes made to its non volatile memory prior to showing the input variable gt Selects the display digit to be modified The selected digit will flash together with the program indicator When in programming mode it should be noted that the first digit in the display may not be visible but the program indicator will flash to indicate that the instrument is in programming mode even though no digits can be seen to be flashing 4 Increments each selected display digit 0 9 Pressing the a key under programming conditions will display the leading digit as 1 1 or a blank display for zero Additionally for items that can be selected from a list such as the baud rate bAud then this key cycles through the available options The currently set value is the first shown data value R Resets the display to the input variable and enters new data i
119. the module Use with caution LCA Toolkit vee Calibration e Cl AAA O Input Sensitivity Decimal Point Mode Help 0 5 to 3 6 mV V 19 999 sf LCA20 y This page allows you to calibrate the module AAN Shunt Calibration Cal Info The table below contains the raw calibration data held in the module Edit these values with caution Calibration Points Gain Offset mV V Gain Offset mV IV d 0 484108 J 5 895472 2 854045 MEA O d 3 876542 5 895472 Jt 2 854045 MBE 0 000000 0 010000 H 0 000000 3J 0 9 J 0 000000 J 0 010000 J 0 000000 sf 0 000000 Jf 0 010000 0 000000 a 0 000000 f 0 010000 J 0 000000 Defaults mV V Input Calibrated Value Underrange Value Overrange Value Units 19 99900 19 99900 MM 0 650645 M 0 982338 LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 25 Calibration Points Shows the number of calibration points in the calibration The following triplets of controls are repeated for each calibration point mV V Between this mV V value and the next the following gain and offset will be used to convert the value to the Calibrated Value Gain The gain multiplication factor applied to the mV V value Offset The offset added to the mV V Gain value to give the Calibrated Value Defaults Click this button to revert all calibration data to factory defaults The Calibrated Value will then be mV V Page 50 LCA20 User Manual 51
120. they are not you will be notified If all connected modules are not set to the same baud rate you will need to connect them to the RS485 bus one at a time to set the desired baud rates Page 31 LCA20 User Manual 517 182 Revision 1 4 Information The Information page shows useful information about the module The large display may prove useful in simple monitoring projects LCA Toolkit minis Information e CL A OR ere you can view informatio le is shows the reading and any errors relating to the input 0 The format button allows you to format the value displayed and k g does not affect the module Serial Number Firmware Version Update Rate Select display format 0999999999 02 0 80 samples per second 0 0000 Display Source Mode Gross LCA15 ES LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 39 Main Display Displays the module value If units have been specified at calibration then the units will be shown Serial Number Shows the serial number of the module Firmware Version Shows the module firmware version Display Source Indicates where the display Parameter and LCD where fitted gets its value Mode Indicates the operational mode of the module LCA15 is backwards compatible with the LCA15 module and LCA20 supports the new features Update Rate Indicates the update rate of the module This is the rate at which a new value is generated Select Display
121. tion nEt Selects Defaults display source from nEt Net Value GroS Gross Value PEAK Peak Value VALY Valley Value SNAP Snap Held value nEt SelectsPeak value source nEt Net Value GroS Gross Value nEt Selects Valley value source nEt Net Value GroS Gross Value SNAP OVrV undV LCiP FSTP FLVL SEnS rATE ACAL AdCL AdCH CALL CALH At trbd ZEro SErL CP SdSt NF FP he RPreNU NINN N W W NN Il 19999 19999 Q 255 0 19999 7 8 7 8 19999 19999 19999 19999 19999 0 254 nEt 19999 19999 0000 0000 0 5 3 105 0000 0000 0000 0000 0000 0000 0000 0000 0001 Selects Snap value source nEt Net Value GroS Gross Value Over range value The Value at which the display will indicate a Positive over range condition and force the relays and analogue output to behave accordingly Display shows 1 Over range value The Value at which the display will indicate a Negative under range condition and force the relays and analogue output to behave accordingly Display shows 1 Load cell configuration menu Low pass Filter Steps Low pass Filter Dynamic Level Load cell sensitivity 0 5 3 0 5 to 3 7 mV V range 3 7 7 3 7 to 7 8 mV V range Measurement rate LOSPS and 80SPS 10S 10 samples per second 80S 80 samples per second Analogue Input Calibration Menu mV V Value captured for low calibration point CALL mV V Value captured for high calibration point CALH Cal
122. tling time but deeper filtering effect If a rapid or step change in the input causes the difference between the new input value and the current filtered value to exceed the amount set in Filter Level the filter acquires the new value immediately by resetting the divisor to 1 The filtering process repeats as above on subsequent updates by adding one half of the difference one third one quarter etc until 1 Filter Steps is reached This allows the Filter to respond rapidly to fast moving input signals but still retain its smoothing characteristic as the input settles When a step change occurs which does not exceed Filter Level the new filtered value is calculated as follows Page 111 LCA20 User Manual 517 182 Revision 1 4 New Filter Output Value Current Filter Output Value a ee a ae Note To retain the filtering effect but defeat the step change response set Filter Steps appropriately and Filter Level to 0 The time taken to reach 63 of a step change input which is less than Filter Level depends on the rate at which values are passed to the dynamic filter set in A D Measurement Rate 10 or 80 samples per second SPS multiplied by Filter Steps The table below gives an indication of the response to a step input which ts less than Filter Level of Final Value Time To settle 63 Measurement Period Filter Steps 99 Measurement Period Filter Steps 5 99 9 Measurement Period Filter Steps 7 For example if
123. ug 1 Out In Data Transmit receive negative polarity 2 Out In Data Transmit receive positive polarity 6 Way Screw Terminals 1 Out In Data Transmit receive negative polarity 2 Out In Data Transmit receive positive polarity The diagram below shows the connection to the 6 way screw terminals Page 100 LCA20 User Manual 517 182 Revision 1 4 LCA20 1 LCA20 2 LCA20 3 LCA20 n HINASA Se3 O The last LC4 module in the chain has DIP switch position 3 set to On Driver Settings If you are using the communications to read or log data at high speed This includes viewing the Trend Chart using the LCA20 Toolkit you may find the desired speed is unachievable even with high baud rates This is due to the default settings of the Latency Timer Changing this setting involves opening the Device Manager which will be dependent on your operating system See Also Installation Connections Programming Cable PGM1 Driver Settings for more information Page 101 LCA20 User Manual 517 182 Revision 1 4 LED Indicator Status LED The Green LED Is used to indicate a number of functions e Under normal healthy operating conditions the Green LED should be OFF flashing ON every second e If the LED is ON Flashing OFF every second then this indicates that an error condition exists and the reasons for this are as follows o There isa Load cell integrity problem o The Shunt calibration has been activated o An Over range or und
124. ult Inverted 4 LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 103 Gain Alter the analogue output gain by clicking and dragging the pointer on the virtual knob Offset Alter the analogue output offset by clicking and dragging the pointer on the virtual knob Default Clicking this button will return the gain and offset to default values O The gain and offset are interactive You may need to alternate between the adjustments to achieve the desired effect These virtual knobs replace the physical trimmers on the original LCA15 module Page 41 LCA20 User Manual 517 182 Revision 1 4 Relays X This page allows you to configure the relays LCA Toolkit md EVE AA AED OR Relay 1 On Relay 2 Off Help Source Setpoint inflight Source Setpoint inflight Here you can view information 10 00000 0 000000 Net MW 0 000000 0 000000 Ito Hysteresis Inverted Latched Hysteresis Inverted Latched affect the module The format button allows you to format the value does not affect the module Normally Open Normally Closed Energised LCA Toolkit LCB20 Module serial number 999999999 set as station 253 on COM2 Version 0 0 25 Source Select the source of the value that the relays will act upon Setpoint The target value at which the relay operation will function The actual point at which contacts may changeover may be affected by Inflight and hysteresis value
125. um load impedance for the current output is 1k ohm Screw Terminal Block Page 93 LCA20 User Manual 517 182 Revision 1 4 Relay Module LR1 The Relays provide for 5 amp switching at 240VAC Suitable cable for the installation should be selected O Care should be taken as any connections already made by the installer may be at mains potential O Ensure the cover plate re fitted to the LS1 or LS3 after installation Fitting Module to Main Board The module fits to the main board by plugging the white connector on the underside of the LR1 module into J 10 on the main board Three nylon pillars also engage into the three hole positions shown LK J14 o O The LEDs marked SP1 and SP2 will illuminate when the relay is energised Page 94 LCA20 User Manual 517 182 Revision 1 4 Communications Module LC4 The optional LC4 communications module acts as a two way data link for the LCA20 providing an electrically isolated multi standard interface O The Isolation is rated as a maximum 130V RMS or DC to analogue input or any other port O Maximum cable length is dependent on cable used baud rate and electrical environment Fitting Module to Main Board The module fits to the main board by plugging the white connector on the underside of the LC4 module into J 9 on the main board Two nylon pillars also engage into the two hole positions shown Lia 314 a O RS232 RS232 is for a one to one connection i e only one
126. value plus System Zero Apply Dynamic Filter if Filter Steps is non zero to Pre Gross value Check Pre Gross value has not exceded either over or under range levels Apply Zero Tracking value to Pre Gross value Net Gross Auto Tare VEUT Check for new Peak value Check for new Valley value Read Write Parameter a Function SS Read Only Parameter Status flag Input Over range or Input Under Range Gross Valley 1 The measurement process starts by converting the load cell analogue values to digital values The Analogue to Digital Converter ADC has a bipolar input allowing for load cells to be used in both tension and compression The ADC measures the 5V excitation voltage using the sense inputs and through an amplifier the output of the load cells from these two measurements the mV V output from the load cells is calculated This amplifier has two gain settings allowing for two ranges 3 7mV V and 7 8mV V These gains setting are selected by the Sensitivity parameter The ADC can also take measurements at two different rates 10 samples per second sps and 80sps selected by the Rate parameter The output from the ADC Is a signed 20bit result in ADC counts terms LCA20 User Manual 517 182 Page 108 Revision 1 4 2 When a new ADC result is available which is determined by the Rate parameter the process is checked to see if block averaging is required This is determined by the value set i
127. ytes of nibble data the last having its MS bit set followed by the two checksum nibbles To write the value 100 0 to variable SP1 command number decimal 21 at station decimal 47 send the following Floating point 100 0 0x42h 0xC8h 0x00h 0x00h DATA Note most significant bit of last byte set Serial Device Station number Frame character The response is then Serial Device Station number ACK Ox2Fh Ox06h Page 67 LCA20 User Manual 517 182 Revision 1 4 Reading of Parameters To read an individual parameters the command number is sent with the MS bit set i e no data following To read OPH command number decimal 32 from Serial Device Station number decimal 47 send the following Command Note Most Significant bit of last byte set Serial Device Station number Frame character Assuming the current value of OPH is 123 45 Which in floating point format is represented as OxC2F6E666h Ox2Fh Ox0Ch Ox02h Ox0Fh Ox06h Ox0Eh Ox06h Ox06h Ox06h 0x02h Ox00h Action Commands These are transmitted like read commands e no data sent The response is identical to write commands To Reset RST command decimal 115 at Serial Device Station number decimal 3 send the following Command Note Most Significant bit of last byte set Serial Device Station number Frame character The response is then Serial Device Station number ACK Ox03h Ox06h Page 68 LCA20 User Manual 517

LCA20 User Manual - Novatech Measurements Ltd

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