LD25x User's guide in English
Contents
1. EN lu O gt ErrorP is looP 999999 0 010 Ret FEES 0 3 5 IE ME E 32 7 EE NN ME a 6 MAN LD25x E 1 0 odt Parameters list 39 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x Serial d Dem Min Max Defaul De Description Text n a SEL Positions Characters ELITS Ve LI value En ou o o o or TT 1 6 A 1 6 A2 A3 999999 6 M 999999 6 Ab 999999 6 A 999999 6 AT 999999 6 A 999999 6 A 6 99999 pass 199999 999999 999999 Eus Oo loss som MAN 199999 999999 99999 6 di fame 199999 999999 99999 6 999999 399999 T Linear Point 9 99999 re 599999 a Linear Point 10 99999 ule 99999 H 99999 l Pity 199999 999999 99999 m Linear point 12 99999 ds Ple 99999 ma 99999 P I3 99999 l 99999 l P 99999 Linear point 15 99999 P1S_4 99999 ma Linear point 16 99993 H P164 199999 999999 99999 O O5 O O O O O O O O O O CO OIO o N C OIOIOIOIOIOIOQO UJ U o v w w C ke O O71 BI Ws NM O CO N OT B C hM CO CO Oo E O gt O gt C2 CO O gt O gt CO r Oo DJ MAN LD25x E 1 0 odt Parameters list 40 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 10 2 Analogue output model LD251 See section 7 3 Model LD251 additional2. 3 of 42 PH SYSTEMS www phsystems be sales phsystems be li a 4 Electrical connections WARNING LD25x Turn OFF the power supply before connecting the device LD250 Display unit only Al connections are as shown below except for terminals 8 9 and 10 which are not connected LD251 Display unit with analogue output GND 230VAC 115 VAC 0 VAC LI z 1538 o oO D a A Os O os g Z mo Os a 233339592 N N e OeeEEEO o 0 4 20 mA analogue PE u LD252 Display unit with 2 presets and transistor outputs GND 230VAC 115 VAC 0 VAC LI LI DI Input C Reset Input A GND PE wj LD253 Display unit with serial interface 115 VAC z o O co e O E Os O lt nay 55590300 ZZ M QQG O72 zZ x Q c CcOo TxD B MAN LD25x E 1 0 odt PH SYSTEMS www phsystems be sales phsystems be Electrical connections 4 of 42 lika LD25x 4 1 Power supply The unit accepts DC power supply from 17 V to 30 V when using terminals 1 and 2 The consumption depends on the level of the supply voltage typically 130mA at 30V or 190mA at 17V plus current taken from aux output For AC supply the terminals O VAC 115 VAC or 230 VAC can be used The total AC power Is 7 5 VA The pictures
3. 5 000 will already produce 5 volts with the output in zero state Analogue Gain It is meant to set the analogue output swing Setting 10 00 will allow full swing of 10 V or 20 200 00 99 99 mA setting 8 00 will reduce the swing to 8 V or 16 mA The following Operational parameters provide scaling of the analogue output Menu Setting Range Default AnALEG Analogue Begin Start value of the analogue conversion range 999999 Analogue End 199999 HnHEnGd End value of the analogue conversion range 999999 mony By means of the two above parameters any window of the whole display range can be mapped onto the analogue output MAN LD25x E 1 0 odt Setup procedure 19 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x he subsequent example shows how to convert the display range from 1400 to 2000 into an analogue signal of 2 10 volts sl Analogue Output 8 6 4 2 SSI Display Value 1000 2000 3000 4000 5000 A ChAr 0 10V HnRbEG 1400 OFFSEt 2 000 AnREnd 2000 GRin 8 00 NOTE All settings refer to the scaled values which are shown in the display of the unit and not to the original SSI encoder data MAN LD25x E 1 0 odt Setup procedure 20 of 42 PH SYSTEMS www phsystems be sales phsystems be lika 7 4 Model LD252 additional settings for preselections and switching outputs The basic setup menu provides the following additional parameters LD25
4. M Factor Multiplying factor for the SSI value 9 999 9 999 after consideration of possible bit blanking D Factor Dividing factor for the SSI value 0 001 9 999 after consideration of possible bit blanking P Factor This signed value will be added to the SSI result xu after consideration of possible bit blanking 299999 000000 Decimal Point 00000 0 Setting according to the decimal formats shown in 00000 0 the display 0 00000 Display Display mode of the unit norm regular scaling of the display 359 59 angular display format 359 59 with use of the Round Loop function For more details see section 8 4 2 Round Loop function on page 32 Lo Bit Bit Blanking function defines the lowest bit for evaluation lo evaluate all encoder bits this parameter has to be set to 01 For more details see section 8 2 Evaluation of encoder bits on page 28 Hi Bit Bit Blanking function defines the highest bit for evaluation lo evaluate all encoder bits this E 25 parameter has to be set to the total number of bits according to setting For more details see section 8 2 Evaluation of encoder bits on page 28 Scaling details are explained in section 8 3 Scaling of the display on page 29 For more details about Bit Blanking function see section 8 2 Evaluation of encoder bits on page 28 MAN LD25x E 1 0 odt Setup procedure 16 of 42 PH SYSTEMS www phsystems be
5. dir item from O to 1 now to receive the desired sense of direction changes after further parameter settings may cause different results e Set the desired zero position either by entering the numeric value to the O Position register D Pos item or by using the Reset function as described previously Your zero definition will divide the range into a positive and a negative zone e At this time you are free to set all other registers according to your needs he subsequent drawings show the principle of evaluation with use of a 13 bit single turn encoder with the direction bit dir item set to either O or to 1 and with the zero position register O Pos item set to 1024 x Subject of correct sequence with parameter settings MAN LD25x E 1 0 odt Hints for application 30 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x Original encoder signal m d Encoder 13Bit Direction 0 0 Position 1024 0 PoS 1024 Data display with positive counting direction Mi 8192 A n Original encoder signal po a e Encoder 13Bit Cw Direction 1 0 Position 1024 360 degrees IN 459 0 PoS 1024 Display Data display with negative counting direction MAN LD25x E 1 0 odt Hints for application 31 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 8 4 2 Round Loop function This operational mode is often used with rotating round tables or sim
6. sales phsystems be li a LD25x Menu Setting Range Default dir Direction wa Parameter to negate the SSI value resulting in a reversal of the direction of the encoder count riGht increasing values with forward motion RiGht ribht LEFt LEFt decreasing values with forward motion Error please refer to section 8 6 Error messages on page 34 Defines the control of presence of an encoder and the location of the error bit in case of error 00 No error bit available 0 32 Control of presence of an encoder is off le 01 No error bit available Control of presence of an encoder is on Location of the error bit Control of presence of an encoder is on ErrorP Error Polarity Defines the polarity of the error bit in case of error 0 Error Bit is Low in case of error 1 Error bit is High in case of error When an error occurs Err b message is invoked to appear on the display see section 8 6 Error messages on page 34 The same function can also be used to monitor the Power Failure Bit of an encoder mostly called PFB Round Loop Defines the number of encoder steps per revolution when using the Round Loop function for further information see section 8 4 2 Round Loop function on page 32 0 999999 0 Normal display of the encoder data no Round Loop function gt 0 Number of steps per Round Loop cycle Time Sets the update cycle of the display and of the analogue output or the switc
7. unit returns to the normal operation At the same time all linearization points have been finally saved NOTE e The unit will examine the constraint valid for the x values of interpolation points Every interpolation point must be higher than its preceding point If this constraint is breached all 6 decimal points will blink automatically as a warning Pressing the CMD key will not store the illegal value but result in an error text E r r L G e To exit the teach mode again you have the following two possibilities 1 Press the ENTER key for 2 seconds On the display you will read StOP for a short time and then the unit will switch back to the normal mode 2 Just do nothing After 10 seconds the unit will switch back to the normal mode automatically In both cases the parameters of linearization PO tx to P 16_Y will not change MAN LD25x E 1 0 odt Special functions 38 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 10 Parameters list 10 1 General a Min Max Default ara Description Text a caut Positions Characters value value value code See mm 0 1 09 4 po fa SS Bits bits 08 Stona eom 9 1 0 SSl Baudrate bRUd 01 10009 1000 5 est 0 2 NPN PNP char O 1 Lg oe Es nul s N O1 briGht 1 000 1 000 Point 0 Display dSPtR 0 Hi bit 1 Lo bit 1 Direction dr 0 0 0 Co EN I
8. 444 0 kHz 421 0 kHz 400 0 kHz 380 0 kHz 363 0 kHz 347 0 kHz 333 0 kHz 320 0 kHz 307 0 kHz 296 0 kHz 285 0 kHz 275 0 kHz 266 0 kHz 258 0 kHz 250 0 kHz 27 of 42 lika LD25x With Master operation therefore other settings will result in generation of the next upper or lower value according to above list With all settings 250 0 kHz the error between set rate and generated rate becomes negligible It is mandatory to set the baud rate also with Slave operation In this case however the setting is only used to determine the pause time for correct synchronization pause is detected after 4 clock cycles The unit automatically synchronizes with every remote clock signal within the specified baud rate range 8 2 Evaluation of encoder bits his section is meant to explain the correlation between the basic parameter bit5 section 7 1 Basic settings on page 14 and the operational parameters Hi bit and Lo bit see section 7 2 Operational parameters on page 16 The example below assumes that the encoder has a 16 bit resolution NOTE e Unused bits may be blanked out according to individual need e Whenever the number of bits clock cycles requested from the SSI Master is higher than the real number of encoder bits all excessive bits must be blanked by corresponding setting of parameters Hi bit and Lo bit see section 7 2 Operational parameters on page 16 8 2 1 Basic settings In general parameter bitS will always be set according
9. Display value d do 1 cos9 SSI Encoder P16 y P15 y PO7 y POS y PO3 y PO1 y SSI Data PO1 x PO3 x PO5 _ x PO7_x P15 x P16 x MAN LD25x E 1 0 odt Special functions 36 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 9 2 Manual input or teaching of the interpolation points Interpolation points to form the linearization curve can be entered one after each other using the same procedure as for all other numeric parameters This means you will have to enter all parameters PO Ix to P 6_x and PO IY to P I6 Y manually using the keypad WARNING During manual input of interpolation points the unit will not examine the settings PO L x to P IB x Therefore the operator is responsible for adherence to the constraint PG tx lt POe_x lt lt P IS_x lt P Ib x In most cases it should however be much more convenient to use the Teach function For this method we have to move the encoder step by step from one interpolation point to the next After each step we enter the desired display value through the keypad How to use the Teach function e Please select the desired range of linearization see section 7 1 Basic settings e Hold down the CMD key for 3 seconds until the display shows EERCh Now the unit has switched over to the Teach mode lo start the teach procedure please press again the CMD key within the next 10 seconds
10. Operating the front keys 8 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 5 2 Selection and setting of parameters 5 2 1 Selecting a parameter The ENTER key will scroll through the menu The SET key allows to select the corresponding item and change the setting or the numeric value After this the selection can be saved by pressing the ENTER key again which automatically changes over to the next menu Item 5 2 2 Changing parameter settings With numerical entries at first the lowest digit will blink When keeping the SET key continuously down the highlighted digit will scroll in a continuous loop from O to 9 and again from O to 9 and so on After releasing the SET key the actual value will remain and the next digit will be highlighted blink This procedure allows setting all digits to the desired values After the most significant digit has been set the low order digit will blink again and you can make corrections if necessary With signed parameters the high order digit will scroll from O to 9 positive followed by and 1 negative 5 2 3 Saving settings o save the actual setting press the ENTER key which will also automatically scroll forward the menu NOTE At any time the unit changes from programming mode to normal display operation when you keep the ENTER key down again for 3 seconds at least 5 2 4 Time out function A time out function will automatically terminate every menu l
11. The display will then show PO _X e With respect to the consistency required for linearization all parameters from PO tx to P I6 Y will be overwritten by suitable initial values first Initial values for PO tx and PO ILS are 199999 and all other values will start with 999999 e Press once more the CMD key to display the actual encoder position hen move the encoder to the first of the desired interpolation points e When you read the x value of your first interpolation point in the display press CMD key again This will automatically store the actual display value in the PO tx register For about 1 second you will read PO I Y on the display followed by the same reading again that has been stored previously e This display value now can be edited like a regular parameter and you can change it to the desired PO 1 4 value e When you read the desired PO _Y value in your display save it by pressing CMD key again This will cause the display to automatically scroll to the next interpolation point POe_x MAN LD25x E 1 0 odt Special functions 37 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x e Once we have reached and saved the last interpolation points P 6_x 4Y the routine will restart with PO tx again You are free to double check your settings once more or to make corrections To finish the Teach procedure keep ENTER key down for about 2 seconds In the display you will read StOP for a short time and then the
12. The following operational parameters provide setting of the switching thresholds Menu Setting Range Default 199999 10000 999999 199999 5000 999999 The working direction of the Hysteresis depends on the setting of the switching characteristics With settings GE or LE respectively the following switch points will result Display Value Preselection Hysteresis GE Greater Equal Hysteresis effect with Greater Equal __ _ Hysteresis Preselection I l1 bw er Equal Hysteresis effect with Lower Equal It is possible to check up on the actual switching state of the outputs at any time For this just tap on the ENTER key shortly he display will then show for the next two seconds one of the following information Meaning Both outputs are actually off Both outputs are actually on Output 1 Is on Output 2 is off Output 1 is off Output 2 is on MAN LD25x E 1 0 odt Setup procedure 22 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 7 5 Model LD253 additional settings for the serial interface he basic setup menu contains the main parameters for configuration of the serial interface Menu Setting Range Default G Lin it Serial Unit Number You can assign any address number between 11 and 99 to your unit The address must not contain a O because such numbers are reserved for collective addressing of several units Serial data for
13. You must not exceed the maximum output current of 150 mA If you switch inductive loads please provide filtering of the coil by means of an external diode The optocoupler outputs provide a response time of approx 5 msec with resistive load 8 Com 5 35V Preset 2 Opto Preset 1 Opto 9 Output 1 max 150 mA 10 Output 2 max 150 mA MAN LD25x E 1 0 odt Electrical connections 6 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 4 6 Serial RS 232 RS 485 interface LD253 model only Ex factory the unit is set to RS 232 communication his setting can be changed to RS 485 2 wire by means of an internal DIL switch To access the DIL switch you must remove the screw terminal connectors and the back panel Then pull the board to the rear to remove the PCB from its housing DIL Switch 5 Removal of the back panel Location of the DIL switch R5 232 RS 485 108 TxD 108 B 998 RxD 98 A 82 GND 80 GND WARNING 1 Never set DIL switch positions 1 and 2 or DIL switch positions 3 and 4 to ON at the same time 2 After setting the switch shift the print carefully back to its housing in order to avoid damaging the front pins for connection with the front keypad plate a e 0 ABl e C eO Ne Z Q Ae N We C3 e SEEN PC Sub D 9 LD253 5
14. by the user 1 3 Mechanical safety Install the device following strictly the information in the section 3 Mounting instructions do not disassemble the unit do not tool the unit delicate electronic equipment handle with care do not subject the device and the shaft to knocks or shocks respect the environmental characteristics of the device MAN LD25x E 1 0 odt Safety summary 2 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 2 Identification Device can be identified through the ordering code and the serial number printed on the label applied to its body Information is listed in the delivery document too Please always quote the ordering code and the serial number when reaching Lika Electronic s r l for purchasing spare parts or needing assistance For any information on the technical characteristics of the product refer to the technical catalog 3 Mounting instructions WARNING Mount the unit with power supply disconnected Mount the display into the provided cut out approx 91 x 44 mm without panel clips Install panel clips on the display housing and screw until fixed 110 0 4 331 96 0 3 780 9 0 345 129 0 5 079 140 5 5 531 91 0 3 583 Panel cut out 91 x 44 mm 3 583 x 1 732 MAN LD25x E 1 0 odt Mounting instructions
15. can cause serious or fatal Injury warning Do not use in explosive or flammable areas failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the equipment Lika Electronic s r l assumes no liability for the customer s failure to comply with these requirements 1 2 Electrical safety Turn OFF power supply before connecting the device connect according to explanation in section 4 Electrical connections in compliance with 2004 108 EC norm on electromagnetic A compatibility following precautions must be taken N before handling and installing the equipment discharge electrical charge from your body and tools which may come in touch with the device power supply must be stabilized without noise install EMC filters on device power supply if needed always use shielded cables twisted pair cables whenever possible avoid cables runs longer than necessary avoid running the signal cable near high voltage power cables mount the device as far as possible from any capacitive or inductive noise source shield the device from noise source if needed minimize noise by connecting the unit to ground GND Make sure that ground GND is not affected by noise The connection point to ground can be situated both on the device side and on user s side The best solution to minimize the interference must be carried out
16. the code locking of the keypad has been switched on see on page 15 any key access first results as follows To access the menu you must press the following key sequence within 10 seconds otherwise the unit will automatically return to the normal display mode MAN LD25x E 1 0 odt Operating the front keys 11 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 6 Operator menu The menu provides one section with Basic Parameters see section 7 1 Basic settings on page 14 and another section with Operational Parameters see section 7 2 Operational parameters on page 16 On the display you will only find those parameters which have been enabled by basic settings E g when the Linearisation function has been disabled in the basic set up the associated linearization parameters will also not appear in the parameter menu All parameters as good as possible are designated by text fragments Even though the possibilities of forming texts are very limited with a 7 segment display this method has proved to be most suitable for simplification of the programming procedure he subsequent table shows the general structure of the menu Detailed descriptions of all parameters will follow in section 7 Setup procedure on page 14 6 1 Overview of basic parameters SSI Mode SSI Mode SSI Mode SSI Mode SSI Bits SSI Bits SSI Bits SSI Bits SSI Format SSI Format SSI Format SSI Format 551 Baud Rate SSI Baud Rat
17. to the real resolution of the encoder i e bitS 16 with a 16 bit encoder In this normal case the SSI telegram will not contain any excessive bits With some applications e g with Slave operation however it may happen that the Master transmits more clock cycles than the number of encoder bits e g 21 clocks with a 16 bit encoder In such a case the master would always request 21 bits from the encoder where the encoder responds with 16 usable bits only followed by 5 waste bits hese 5 excessive bits must be blanked All standard SSI telegrams start with the most significant bit MSB and close with the least significant bit LSB Unusable waste bits X will follow at the end of the string To blank these bits out in our example we would have to set Hi bit to 21 and Lo bit to 6 for proper evaluation of the encoder information read 2112 A peg MA We F be iT T l7 7 ME ens e E n o ta g 7 le 15s 4 3 2 11 Jo ee e A OTO T ep ep OTO fore eee ee eee VO he te 16 1i 1 1 1 1i 1 7 5 4 3 2 1 1 X X X X X encoder 5 4 3 7 1 0 MAN LD25x E 1 0 odt Hints for application 28 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 8 3 Scaling of the display Under consideration of the scaling parameters which have been described previously the final display value of the unit will result from M Factor DISPLAY Encoder SSI Data 0 Position x P Factor D Factor NOTE Encode
18. Connection of the RS 485 interface MAN LD25x E 1 0 odt Electrical connections 7 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 5 Operating the front keys For setup and other operations the unit is fitted with three front keys which will be denominated as follows in the next pages ENTER SET CMD Input Setting Command he functions of the keys are depending on the actual operating state of the unit he following three operating states apply e Normal display state see section 5 1 Normal display state on page 8 e Setup state see section 5 2 Selection and setting of parameters on page 9 Basic setup see section 7 1 Basic settings on page 14 Operational parameters setup see section 7 2 Operational parameters on page 16 e Teach operation see section 5 3 Teach operation on page 10 5 1 Normal display state NOTE You can only change over to other operation states while the unit is in the normal display state Change over to Key operation Basic setup Keep ENTER and SET down simultaneously for 3 seconds Operational Keep ENTER down for 3 seconds parameter setup Teach operation Keep CMD down for 3 seconds The CMD key is only used to execute the Teach procedure with linearization For more details please refer to sections 9 1 Linearization and 9 2 Manual input or teaching of the interpolation points on page 35 MAN LD25x E 1 0 odt
19. Testing functions on page 34 ELE ChA Characteristics J Switching characteristics of the Reset input NPN switch to PNP switch to Brightness 20 40 60 bribht Brightness of the 7 segment LED display 80 100 Please follow the hints given in section 4 3 Control inputs A B and C on page 5 carefully MAN LD25x E 1 0 odt Setup procedure 14 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x Setting range Default Keypad protection code for more details see section 5 5 Code locking of the keypad on page 11 Keypad enabled continuously no Keypad locked for any access Hil Keypad locked except for access to preselections 1 and 2 LD252 only see section 7 4 Model LD252 additional settings for preselections and switching P FrEE outputs on page 21 Linearization mode Li ER For details please refer to sections 9 1 Linearization iL f and 9 2 Manual input or teaching of the interpolation points on page 35 The linearization is switched off no Linearization settings for the positive range only um negative values will appear as a mirror Q Linearization over the full numeric range u auam If no is set next to this item the menu will not display any further linearization parameter MAN LD25x E 1 0 odt Setup procedure 15 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 7 2 Operational parameters Setting Range Default
20. ation function has been enabled in the Basic menu MAN LD25x E 1 0 odt PH SYSTEMS www phsystems be Operator menu sales phsystems be 13 of 42 li a LD25x 7 Setup procedure For better understanding the following sections 7 1 Basic settings and 7 2 Operational parameters explain settings related to the display only model LD250 Model specific settings for analogue output model LD251 Preselections model LD252 and Serial Link model LD253 will be explained separately under sections from 7 3 Model LD251 additional settings for the analogue output to 7 5 Model LD253 additional settings for the serial interface 7 1 Basic settings Customarily these settings have to be carried out one time only upon the very first use of the unit he basic setup selects the desired operation mode of the unit the input characteristics PNP NPN and the desired brightness of the LED display NOTE To access the Basic Setup press the ENTER and SET keys simultaneously for at least 3 seconds Setting range Default SSI Mode de Setting of Master mode or Slave mode mo For details see section 8 1 Master and Slave Operation on page 27 SSI Bits bitS Bit length of the SSI string For more details see section 8 2 Evaluation of encoder bits on page 28 F SSl Format orm Setting of the SSI code Binary or Gray _ DAU SSl Baud Rate SSI Test Cd tESt SSI Self test functions For more details see section 8 5
21. d opening this connection will generate a rising edge to start a serial transmission 2 When you use 2 wire NAMUR type sensors please select NPN connect the negative wire of the sensor to GND and the positive wire to the corresponding input MAN LD25x E 1 0 odt Electrical connections 5 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x Typical input circuit of control input PNP NPN 24V int 24V int A 4 Tk Input lt r gt Input TIE v GND GND GND The minimum pulse duration on the Reset input C must be 5 msec 4 4 Adjustable analogue output LD251 model only A voltage output is available operating in a range of O 10 V or 10 V 10 V according to setting At the same time a current output 0 4 20 mA is available Both outputs refer to the GND potential and the polarity changes with the sign in the display Ihe outputs are proportional to the display value and provide a 14 bit resolution he maximum current for the voltage output is 2 mA and the load on the current output can vary between O and max 300 ohms he response time of the analogue output at each change of the encoder position Is approx 7 msec 4 5 Optocoupler transistor outputs LD252 model only Outputs provide programmable switching characteristics and are potential free Please connect terminal 8 COM to the positive potential of the voltage you want to switch range 5V 35V
22. e SSI Baud Rate 551 Baud Rate SSI Test SSI Test SSI Test SSI Test Characteristics Characteristics Characteristics Characteristics Brightness Brightness Brightness Brightness Code Code Code Code Linearization mode Linearization mode Linearization mode Linearization mode Analogue Preselection mode 1 Serial unit number characteristics Analogue offset Preselection mode 2 Serial format Analogue gain Hysteresis 1 Serial baud rate Hysteresis 2 MAN LD25x E 1 0 odt Operator menu 12 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 6 2 Overview of operational parameters M Factor D Factor P Factor Decimal point Display Hi Bit MSB lo Bit LSB Direction Error Error_Polarity Round Loop Time Reset Zero Position M Factor D Factor P Factor Decimal point Display Hi Bit MSB Lo Bit LSB Direction Error Error Polarity Round Loop Time Reset Zero Position Analogue Begin Analogue End PO1 X Poly P16_X P16 Y Preselection 1 Preselection 2 M Factor D Factor P Factor Decimal point Display Hi Bit MSB Lo Bit LSB Direction Error Error Polarity Round Loop Time Reset Zero Position M Factor D Factor P Factor Decimal point Display Hi Bit MSB Lo Bit LSB Direction Error Error Polarity Round Loop Time Reset Zero Position Ser Timer Ser Mode Ser_ Value PO1 X QUUM a Ple x PI6 Y This only appears if the lineariz
23. e either by shortly pressing the ENTER key or by the rising edge of input A MAN LD25x E 1 0 odt Setup procedure 26 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 8 Hints for application 8 1 Master and Slave Operation Set register modE see section 7 1 Basic settings on page 14 to position Master when the unit should generate the clock signal for the encoder In this case the clock terminals CLK are configured as clock outputs SSI Indicator SSI Encoder l Screen 24V SSI Indicator with Master O eration When your encoder receives its clock from another device already and the unit should only listen to the communication then set register mode to Slave In this case both clock terminals CLK are configured as inputs SSI Indicator Remote Master Screen CLK CLK SSI Encoder SSI Indicator with Slave Operation Set registers bit5 Form and bRUd section 7 1 Basic settings on page 14 according to the encoder you use You are free to set any baud rate in a range from 0 1 kHz to 1000 0 kHz However for technical reasons in the upper frequency range the unit in Master mode can only generate one of the following baud rates accurately MAN LD25x E 1 0 odt Hints for application PH SYSTEMS www phsystems be sales phsystems be 1000 0 kHz 888 0 kHz 800 0 kHz 727 0 kHz 666 0 kHz 615 0 kHz 571 0 kHz 533 0 kHz 500 0 kHz 470 0 kHz
24. ems be
25. evel when for a oreak period of 10 seconds no key has been pressed In this case all changes which have not been confirmed by ENTER yet would remain unconsidered MAN LD25x E 1 0 odt Operating the front keys 9 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 5 3 Teach operation NOTE The time out function remains disabled during all Teach operations Key Function ENTER will terminate or abort any leach operation in progress SET function is fully similar to normal set up operation CMD will save the display value in the register and change over to the next interpolation point For further details on the Teach procedure see section 9 2 Manual input or teaching of the interpolation points on page 37 5 4 Setting all registers to Default values At any time you can return all settings to the factory default values WARNING This action will reset all parameters to factory default values and your own settings will be lost You will have to repeat your individual setup procedure Factory default values are shown in the subsequent parameter tables see section Parameters list on page 39 To reset the unit to default values switch power off e press the ENTER key on the front e keep ENTER down while you power up again MAN LD25x E 1 0 odt Operating the front keys 10 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 5 5 Code locking of the keypad When
26. gain the encoder wiring and the settings of all SSI relevant parameters Description Overflow The selected SSI baud rate is too high Please set a lower baud rate value Bit error The error bit or the power failure bit of the encoder PFB are set Time out error In Slave mode during the last 0 6 seconds plus wait time setting the unit did not receive any valid data Format error In Slave mode a telegram having a too short length has been received Missing encoder 1 Right after power up the unit detects that all SSI telegrams are empty all bits 1 Missing encoder 2 During normal operation the unit detects that regular SSI telegrams are suddenly followed by empty telegrams all bits 1 MAN LD25x E 1 0 odt Hints for application 34 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 9 Special functions 9 1 Linearization This function allows a non linear input signal to be converted into a linear representation or vice versa 16 Interpolation points are available they can be freely arranged over the whole measuring range at any distance Between two points the unit will interpolate automatically straight lines It Is advisable to set several points into areas with strong bending and to use only a few points in areas with little bending Linearisation Mode has to be set to either I quR or H quR see LinEAr item in section 7 1 Basic settings to enable the linearization function see s
27. hing outputs where applicable The fastest possible update time is 3 msec or the time period corresponding to one telegram with 4 pause clocks With Slave operation the next update will occur when the unit 0 000 1 009 0 01 sec Sec synchronizes again to the Master pause following to the expiration of the update time Please observe that parameter p FAc will cause an additional displacement of the zero position MAN LD25x E 1 0 odt Setup procedure 17 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x FE rES PO i_X PO iY P i6_X P Ib Y Reset A Reset command is available to store the actual SSI position to next register G PoS As a result the display value will become zero at the actual encoder position and all further operation will refer to this new datum point he zero position remains memorized also after power down no Reset function disabled Front Reset operation performed by means of the front SET key E tErn Reset operation performed by means of the remote Reset input FR u E Reset operation performed by means of both key and remote input Zero Position Defines the zero position of the display When you set this parameter to e g 1024 the unit will display zero when the encoder position is 1024 O PoS can be set directly via keypad or by means of an external Reset command Linearization point 1 X X value of the first interpolation point Linearization p
28. ilar applications where the absolute encoder information is only used for a limited and repeating range of the encoder as for instance one revolution of the table which does not necessarily result in one revolution of the encoder shaft The Round Loop function never uses any negative display value he Round Loop function allows a programmable number of encoder steps to be assigned to one complete 360 rotation of the table To avoid miscounting when passing the mechanical overflow of the encoder range the total encoder resolution should be an integer multiple of the number of steps for one loop o proceed with setup operation please first proceed as explained in section 8 4 1 Normal SSI display on page 30 Then set the Round Loop register r LooP item to the number of steps corresponding to one revolution of the table You are free to scale the display to any engineering units desired by setting the scaling factors correspondingly If you like to scale your display with the angular display format 359959 just change the Display register diGPLR item from 0 to 359 59 This will also automatically disable the general scaling factors he subsequent diagram shows the Round Loop function with a 13 bit encoder assuming that one table revolution corresponds to 2048 encoder steps and the zero position is set to 1024 8192 Original encoder signal Encoder 13Bit Direction 0 0 Position 1024 r Loop 2048 Round L
29. in the previous page show a dotted line for grounding to PE This connection is not really necessary neither for safety nor for EMC However for specific applications it may be useful to ground the common potential of all signal lines NOTE When using this earthing option please note that 1 all terminals and potentials marked GND will be earthed 2 you should avoid multiple earthing e g when you use a DC power supply where the Minus is already connected to earth etc 4 2 Aux voltage output Terminal 7 provides a 24 VDC 120 mA max auxiliary output for supply of sensors and encoders 4 3 Control inputs A B and C In LD253 model input A is used to activate a serial transmission rising edge see section 7 5 2 Printer Mode on page 26 Input B is not used Input C operates as a Set Reset input static function active HIGH see section 8 3 Scaling of the display on page 29 In the basic setup menu the inputs can be configured to PNP signal must switch to or to NPN signal must switch to This configuration is valid for all three inputs at the same time he factory setting is always PNP NOTE 1 When NPN setting is used please be aware that open NPN inputs will always represent a logical HIGH state Consequently Input C has to be connected to GND externally to allow normal operation If unconnected the unit would be kept in a continuous Reset state In model LD253 also Input A must be connected to GND an
30. l 111 1 Direct encoder data SSI value SSI value 113 3 Encoder data after Bit Blanking Displa Value with full scaling v ae 101 1 as it appears in the display MAN LD25x E 1 0 odt Setup procedure 24 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 7 5 1 PC Mode Communication with PC mode allows free readout of all parameters and registers of the unit The subsequent example shows the details of communication for serial readout of the actual display value This is the general format of EOT AD1 AD2 C1 C2 ENQ a serial request string EOT Control character Hex 04 AD1 Unit address High Byte AD2 Unit address Low Byte C1 Register code High Byte C2 Register code Low Byte ENO Control character Hex 05 Example Request for the actual display value from unit number 11 ASCII Coce O0 5 0 q q ERO Hexadecimal Binary 00000100 00110001 00110001 0011 1010 00110001 00000101 Upon correct request the unit will respond as shown on the STX Control character Hex 02 right Leading zeros will be C1 Register code High Byte suppressed C2 Register code Low Byte BCC represents a block check xxxxx Register data character generated from an ETX Control character Hex 03 Exclusive OR of all characters BCC Block check character from C1 through ETX inclusively With incorrect request strings the unit only responds SIX C1 C2 EOT o
31. li a LD25x User s manual LD250 LD251 LD252 LD253 Description LD25x is a SSI display for connecting single turn or multi turn SSI encoders The user s interface is a multi function keyboard fitted with 3 keys and a 7 segment and 6 digit LED display Model LD250 is a SSI display only version model LD251 provides an analogue output in addition model LD252 further offers two presets and two switching outputs finally model LD253 is equipped with a RS 232 RS 485 serial interface for connection with a PC Table of contents 1 Safety summary 2 Identification 3 Mounting instructions 4 Electrical connections 5 Operating the front keys 6 Operator menu 7 Setup procedure 8 Hints for application 9 Special functions 10 Parameters list MAN LD25x E 1 0 odt 1 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 1 Safety summary 1 1 Safety Always adhere to the professional safety and accident prevention regulations applicable to your country during device installation and operation installation and maintenance operations have to be carried out by qualified personnel only with power supply disconnected and stationary mechanical parts device must be used only for the purpose appropriate to its design use for purposes other than those for which it has been designed could result in serious personal and or the environment damage high current voltage and moving mechanical parts
32. mat he first character indicates the number of Data Bits The second character specifies the Parity Bit even or odd or none he third character indicates the number of Stop Bits C bfLig Baud rate he following baud rates can be selected MAN LD25x E 1 0 odt Setup procedure 23 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x he following operational parameters provide setting of the communication profile Setting Range Default Serial Timer Setting 0 000 allows manual activation of a serial data 0 000 transmission at any time All other settings specify the 0 010 sec cycle time for automatic transmission provided the S mod item is set to Printer mode see the next item 9 999 sec and on page 26 0 100 sec Between two transmission cycles the unit will allow a pause depending on the baud rate The minimum cycle times for timer transmissions are shown in the table Baud Minimum Cycle Time msec Rate 600 384 1200 192 2400 96 4800 48 9600 24 19200 12 38400 6 Serial Mode Operation according to communication profile see PC section 7 5 1 PC Mode on page 25 Transmission of string type 1 see section 7 5 2 Printer Mode on page 26 Print Transmission of string type 2 see section 7 5 2 Printer Mode on page 26 Printe Serial Register Code Specifies the register code of the data to be transmitted The most important register codes are ASCII Origina
33. oint 1_Y Y value of the first interpolation point Linearization point 16 X X value of the 16 interpolation point Linearization point 16 Y Y value of the 16 interpolation point Setting Range Default No Front E_tErn FruE 199999 999999 S999 ou 999999 999999 199999 999999 999999 199999 a 999999 999999 199999 999999 999999 Please observe that parameter p FAc will cause an additional displacement of the zero position a basic menu Parameters PO1 X to P16 Y appear only when the linearization has been enabled in the For more details about linearization please refer to section 9 1 Linearization on page 35 MAN LD25x E 1 0 odt Setup procedure PH SYSTEMS www phsystems be sales phsystems be 18 of 42 li a LD25x 7 3 Model LD251 additional settings for the analogue output he Basic menu provides the following additional settings Menu Setting Range Default A CHAr Analogue characteristics Select one of the following options 10 V bipolar 0 10 V positive output only 4 20 mA current output 0 20 mA current output With setting 10 Volts the polarity of the output voltage will follow the sign in the display OFFSEE Analogue Offset Set this parameter to O when you expect your analogue signal to start with O V or O mA 4 mA respectively When another zero definition is 9 999 9 999 desired it can be set via this parameter Setting of e g
34. oop display d 2048 1 00000 Na 180 0 PoS 1024 r LooP 2048 Round Loop operation with 2048 steps revolution when using a 13 bit encoder 360 degrees MAN LD25x E 1 0 odt Hints for application 32 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 8 4 3 Operation with Zero Crossing As a special advantage the Round loop function mode can be used to bypass the mechanical encoder overflow position because in this mode the unit continues with steady operation even while the SSI encoder signal passes the mechanical overflow position from maximum value back to zero This feature can help to avoid mechanical adjusting of the encoder zero position with many applications when no other means for the mechanical zero definition is available As a general rule the Reset input will be used to define the zero position The following picture explains the details of this operation 8192 Original encoder signal Overflow Encoder 13 Bit Direction 0 Display r LooP 6000 0 PoS 3500 360 degrees 0 PoS 3500 r LooP 6000 Overflow suppression with a 13 bit SSI encoder 8 4 4 Splitting of SSI encoder information into two separate displays The Bit Blanking function also allows to distribute one SSI telegram to two different SSI indicator units As a typical application the figure below shows how to separate the angular information within one turn and the number of turns ina 16
35. r SSI data are always positive only When also negative values should be indicated this can be achieved by corresponding setting of the parameters O PoS or P FRc see section 7 2 Operational parameters on page 16 he LED display provides 6 decades For this reason all parameter settings including O Po5S are also limited to a maximum range of 6 decades SSI encoders having a resolution of more than 19 bits will however generate SSI data with more than 6 decades In such a case it can become difficult to set the Q PoS value and the other scaling parameters while the mechanical encoder position is in the overflow zone the unit would insistently display overflow To avoid this kind of problem with encoders of more than 19 bits we recommend to use the Bit Blanking function and evaluate 19 bits only see section 8 2 Evaluation of encoder bits on page 28 If you intend to use the Round Loop function later see r LooP parameter in the section 7 2 Operational parameters on page 16 and section 8 4 2 Round Loop function on page 32 it is mandatory to blank all unused bits Remote Reset Set commands via keyboard or external input will overwrite the current value of parameter G PoS by the actual SSI position of the encoder herefore in the formula above the content between the brackets will become zero and the unit will display the same value as set to parameter P FRc This scaling is also automatically stored to the Flash P
36. r just NAK Provided the actual display value of the unit is 180 for instance the full response of the unit will be as shown below ae loa bab on V uw lkol ant Bie we 1 1 mE 1 wa 1 wa 1 we we y 0010 1010 0001 1101 0001 1000 0000 0011 1100 Again BCC represents the block check character formed from the Exclusive OR of all characters from C1 through ETX MAN LD25x E 1 0 odt Setup procedure 25 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 7 5 2 Printer Mode he Printer mode allows cyclic or manual activation of transmissions of the specified register data he corresponding register can be specified by means of parameter S CodE Another parameter called S mod allows the selection between two different string types 9 mod Transmission string type Print1 Space Sign Data Line Carriage feed return Lo XX X x X X tt CR Print2 Sign Data Carriage return The mode of activation of serial transmissions can be determined as follows Cyclic timed Set the S tim item see on page 23 to any value gt transmissions 0 010 sec Select the desired string type next to parameter S mod After exiting the menu the timed transmissions will start automatically Manual activation of Set the S tim item see on page 23 to 0 000 transmissions Select the desired string type by means of parameter S mod After exiting the menu a transmission can be activated at any tim
37. rom for full data retention in power down state MAN LD25x E 1 0 odt Hints for application 29 of 42 PH SYSTEMS www phsystems be sales phsystems be lika LD25x 8 4 Basic modes of operation 8 4 1 Normal SSI display Normal operation provides calculation of the display value from the SSI encoder data and the settings of the scaling factors Negative values can be achieved by corresponding setting of the zero position D Pos item or by inversion of the direction bit dir item o set the unit up without problem it is advisable to use the following sequence of steps e Set all basic registers according to the encoder type you use as shown in section 7 1 Basic settings on page 14 e For better comprehension use first all initial settings as shown in the list xxx according to need M Factor 1 000 Direction D Factor 1 000 Error P Factor 0 Error P Decimal Point 000000 Round Loop Display oO Time Hi bit see sections 82 Reset l and 8 3 on page u Lo bit an O Position Please evaluate 19 bits only to avoid overflow These settings ensure that the unit displays the pure SSI encoder information at first e Move your encoder now from a lower position towards a higher position according to your own definition of low and high When also the display changes from lower to higher values your own definition of directions matches with the encoder definition If not change the setting of Direction
38. settings for the analogue output on page 19 e Min Max Defaul ial Description Text dd Sally moss Gheradians OU value value value code Analogue mode A CHAr 0 3 00 1 GRin 4 Analogue begin AnAbEG 199999 999999 O0 999999 8r 6 10 3 Preselections model LD252 See section 7 4 Model LD252 additional settings for preselections and switching outputs on page 21 n Min IE Default We Serial Description a A paste Positions Characters a value value value code Presel mode 1 CHAr i 0 3 0 Prese mode2 chare 0 5 0 Hist 0 9999 0 00 Preselection 1 r ES 199999 4999999 10000 Preselection 2 PrES 2 199999 999999 5000 10 4 Serial interface model LD253 See section 7 5 Model LD253 additional settings for the serial interface on page 23 Description Text pu max Vac Positions Characters Sa value value value code Serial address 99 Serial format 09 o0 ER NN 0 Baud rate S bRUd 0 0 o0 0 Serial mode Register code 5 LogE MAN LD25x E 1 0 odt Parameters list 41 of 42 PH SYSTEMS www phsystems be sales phsystems be Document release Description 1 0 1st Issue Lika Electronic Via S Lorenzo 25 36010 Carr VI Italy Tel 39 0445 806600 Fax 39 0445 806699 Italy eMail info lika it www lika it World eMail info lika biz www lika biz PH SYSTEMS www phsystems be sales phsyst
39. ubsequent drawing Parameters PO ix to P I6 x select 16 x coordinates representing the display values which the unit would normally show in the display With parameters PO I Y to P 15 9 you can specify which values you would like to display instead of the corresponding x values This means e g that the unit will replace the previous POQ _x value by the new PGe_y value NOTE e With respect to the consistency of the linearization the x registers have to use continuously increasing values e g the x registers must conform to the constraint PO tx lt POe_x lt lt P IS_x lt P IB x e Independently of the selected linearization mode the possible setting range of all registers PO tx PO UY P I6_x P IB S is always 199999 999999 e With measuring values lower than PO t_x the display will always show PO IY e With measuring values higher than P i6 x the display will always show P I M y Pi e 1000 y Pi y 900 P8 x 0 P8 y X y P16 x 1000 P16 y 600 Linearization Mode 4 quA Linearization Mode 1 quA Mirror of positive range MAN LD25x E 1 0 odt Special functions 35 of 42 PH SYSTEMS www phsystems be sales phsystems be lixa LD25x EXAMPLE The picture below shows a sluiceway where the gate Is controlled by means of a SSI encoder We would like to display the clearance of the gate d but the existing encoder information is proportional to the angular information qp
40. x Switching characteristics of output 1 __r GE r LE n GE n LE __r GE __r LE n GE n LE when display value gt preselection 1 when display value lt preselection 1 ON when display value gt preselection 1 timed pulse output when display value lt preselection 1 timed pulse output Switching characteristics of output 2 see CHAN see CHAN see CHAN see CHAN referred to preselection 2 referred to preselection 2 referred to preselection 2 Default r GE Greater Equal output to switch statically ON Lower Equal output to switch statically ON Greater Equal output to switch dynamically Lower Equal output to switch dynamically ON r GE referred to preselection 2 Output switches statically ON when display value gt Preselection 1 Preselection 2 F i e l 2 Hysteresis 1 adjustable hysteresis for output 1 Setting range O 99999 display units Hysteresis 2 adjustable hysteresis for output 2 Setting range 0 99999 display units Output switches dynamically ON when display value gt Preselection 1 Preselection 2 zu HS5t HYSE e Timed output pulses have a fixed duration of 500 msec factory adjustable only Trailing Preset to generate an anticipation signal with a fixed distance to the main signal x MAN LD25x E 1 0 odt Setup procedure PH SYSTEMS www phsystems be 21 of 42 sales phsystems be lika LD25x
41. x 16 multi turn encoder Master bits 17 32 Slave bits 01 16 number of turns angular position Parameters 7 Parameters Bits 32 mi B HIE E L C Bits 32 HiBit 32 HiBit 16 LoBit 17 LoBit 01 Multiturn SSI 16 16 32 Bit MAN LD25x E 1 0 odt Hints for application 33 of 42 PH SYSTEMS www phsystems be sales phsystems be li a LD25x 8 5 Testing functions he test menu can be accessed while programming the basic set up as shown in section 7 1 Basic settings on page 14 see EESE item Most of these tests are for factory use only but the following tests may be useful also to the user Selection Description Cd Clock and data wiring test When the wiring of clock line and data line is ok the display shows Cd 11 Cd 10 message means that the clock line is ok but data wires are false wrong polarity while Cd 01 indicates a problem with the clock lines In Master mode only data lines are subject to this test Cd Clock and data function test he next test generates clock and data signals and feeds them directly into the rear terminals herefore connection Cd 10 informs that clock and data interface are all right All remaining messages indicate there is a problem with the SSI interface circuit 8 6 Error messages The unit can detect and display the errors listed below If you find an error message please check a
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