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i DPI 520 User Manual - AKS

1. DC1 CTRL Q DC2 CTRL R DC3 CTRL S DC4 CTRL T KO O INIIAI COO N O NAK CTRL U SYN CTRL V ETC CTRL W CAN CTRL X EM CTRL Y SUB CTRL Z ESC CTRL FS CTRL GS CTRL RS CTRL US CTRL SPACE or riv H A pl Table 4 5 ASCII Values K163 Issue No 3 4 30 DPI 520 User Manual o U Line back quote Table 4 5 cont ASCII Values K163 Issue No 3 5 Calibration 5 1 5 1 CALIBRATION The instrument is supplied by the manufacturer complete with calibration certificate s The re calibration interval will depend on the total measurement uncertainty which is acceptable for a particular application In order that the instrument remains within the quoted accuracy it is suggested that it s calibration be checked at 90 day intervals The DPI 520 instrument is a very precise controller and measuring instrument and the test equipment and conditions of test must be suitable for the type of work The use of a Class A compensated dead weight tester is essential The tests should be carried out in a controlled environment by a competent trained person If when the accuracy of the instrument is checked it is found to be outside the specification calibration adjustment can be undertaken to compensate errors The manufacturer offers a comprehensive a
2. d 13S3 d Oinv 4 ed OLLVS aani Zd ld AN IVA TIVANYN bd A A Ava ANIOdLAS AYOW OMW3z qvos AYOW IQON 01s Ida WNS OSHO ISX 39143 GNA INTIVA N Nid Andino ALHVd naNd 1S31 S 31vaanva 9312 1S31 S ao A3 WS MOHS SOLVNIIASISLL Nid 13S Wnsxo3Ho ssauydav 191A3q H3TIOHLINOO IQON Od O4 13S siinvaaa HOLVNINHAL WOLSNO HOS 13S QHVOSA3M ssayaay 39143A INY 04 13S dn H3MOd A A A 3331 gzsu SWWOO NAW K163 Issue No 3 3 28 DPI 520 User Manual 3 9 2 Set up MENU When the instrument is first delivered there is no PIN set Any of the top level SETUP menu options can therefore be entered by operation of the SETUP key A prompt showing the available menu options will be presented as follows e g Setup Mode Menu Comms More Select Menu F1 for access to the sub menus available under this option Figure 3 11 shows the sequence of option selection details of each option being described below Parameters given in brackets indicate the factory set default value e Power up Reset The power up parameter can have one of two values Reset or Restore When selected the current status is indicated and a prompt to change is given e g Power up Reset Alter Next Quit Alter F1 toggles the parameter value between the available options Reset and Restore Using Alter F1 select the required parameter and either press Next F2 to move on to the next function or Quit F3 to retu
3. K163 Issue No 3 3 Installation 3 43 From Sheet 1 BAUD RATE QUIT E 9600 A 19 2K 410 150 300 F2 F1 F3 600 1200 2400 4800 L J 7 ODD B F1 rs EVEN Fs Y pU NONE To Sheet 3 Figure 3 14 RS232 Set up Menu Sheet 2 K163 Issue No 3 o 3 44 DPI 520 User Manual From Sheet 2 A OUTPUT COMPUTER F2 F1 F1 Y F3 DIALOGUE PRN oO F1 ENTER new PN lt lt gt F3 4 YES A END DEVICE NO Y F1 F1 F2 Y F3 YES Y X Xx 7 ENABLED Y CHECK SUM 4 A NONE A F2 FA Y F1 AUTO Es Y F1 Y ALWAYS Y DPI 510 E MODE NO A Y F1 r F1 YES Figure 3 14 RS232 Set up Menu Sheet 3 K163 Issue No 3 3 Installation 3 45 3 9 4 Set up More Scale Zero More The More option of the set up menu extends the set up functions to
4. TXD 3 RXD CTS 8 RTS RTS 7 CTS GND 5 GND DSR 6 DSP COMPUTER PRINTER DPI 520 RS232 Figure 3 6 RS232 9 way Connections Hardware Handshaking K163 Issue No 3 3 Installation 3 15 Computer with 25 Pin D type Connector For hardware handshaking between the instrument and a host computer that uses a 25 pin D type port connection proceed as follows O Connect the host communications port to the DPI 520 instrument s 9 way D type RS232 port connector as shown in Figure 3 7 O Use the setup comms menu see Section 3 6 3 to set up the required RS232 parameters O If data transfer problems are experienced with this configuration it may be necessary to use anull modemconnector This effectively means reversing the connection to pins 2 and 3 at the host computer end of the cable RLSD 8 RLSD 24V TXD 2 ia RXD RXD 3 e n TXD CTS 5 RTS RTS 4 CTS GND 7 GND DSR 6 DSR COMPUTER PRINTER If Necessary DPI 520 RS232 Figure 3 7 RS232 25 Way Connections Hardware Handshaking K163 Issue No 3 IE 3 16 DPI 520 User Manual e No Handshaking Computer with 9 pin D type Connector For applications where no handshaking is required between the instrument and a host computer or printer that uses a 9 pin D type port connection proceed as follows O Connect pins 6 4 and 9 together and link pins 7 and 8 atthe host connector end of t
5. The remaining IEEE 488 parameters are selected by toggling the Alter F1 key Figure 3 13 shows the key sequence for setting up the various parameters and the options available for each parameter The values shown at the top of the each listing represent the factory set defaults O Mode DPI 500 DPI 510 Emulation The DPI 520 instrument can emulate either the Druck DPI 500 or DPI 510 instruments in terms of Communication protocol This parameter should remain set at DPI 520 unless there is a specific requirement to emulate either of these instruments O Terminator The Terminator parameters are set up via the RS232 Comms menu as shown in Figure 3 14 O Checksum The Checksum parameters either NONE AUTO or ALWAYS are set up via the RS232 Comms menu as shown in Figure 3 14 K163 Issue No 3 IE 3 38 DPI 520 User Manual n H ENTER NEWPIN lt gt F3 YES ADDRESS 16 r2 TERMINATOR pes F1 CR EOI F1 Alter F2 Next ALWAYS F3 Quit Figure 3 13 IEEE 488 Set up Menu K163 Issue No 3 3 Installation 3 39 RS232 Set up To access the RS232 parameter set up menus select set up enter the PIN if allocated and select Comms F2 from the main menu Selection of Comms provides a choi
6. aias 3 1 3 2 Electrical Connections sine ins cin eterne knee cena dede teintes 3 3 3 2 1 Electrical Safety Instructions 3 3 3 2 2 Power Supply Connections S ua n uuu nnn 3 3 3 3 Communications Interface Connections 3 5 3 4 IEEE 488 Interfager L ewe 3 5 3 4 1 Single Unit Installation sasiaren 3 7 3 4 2 Multiple Unit Installation 3 8 3 5 ravi M 3 9 3 5 1 Generaliniai Ru au Sasa sta a aSa sisa than etna AEAEE Na these 3 9 3 5 2 Connecting to Comp ler u u uu maa Gee iat 3 11 3 6 Connection of Remote User Interface 3 18 3 7 Analogue Output Socket u ete mere uuu tthe ese cie denen 3 18 3 8 Pressure Connections s LLL e a a e D quete sasa 3 19 3 8 1 Pressure Safety Instructions 3 19 3 8 2 Se 3 19 3 8 3 Obtaining the Best Performance u ul uuu Uu ia 3 23 3 8 4 Maximising Valve Life ener criteri 3 24 3 8 4 Control at Zero Gauge Pressure without a Vacuum Pump 3 25 3 9 Sebup MOG6e nein n Ta S aka t aded mE 3 26 3 9 1 ege M qaspa ahi 3 26 3 9 2 Setup MENU u nie a hd ec ir PA te 3 28 Keyboard Unlocked itte 3 28 R call defaults trt ert huqinqa 3 29 Sel s p Controller uuu 3 30 Erde M 3 32 Show SAW REVISION 1 m itae lei 3 33 Self Test Elecironic a tete tren u Sas ss 3
7. K163 Issue No 3 4 24 DPI 520 User Manual 4 6 2 RS232 Output Code Format Incomputerformatall output commands are as described in the OUTPUT CODES section In the addressed mode the output is the same but will be enclosed in and Y This informs all the other instruments on the daisy chain that the string originated from an instrument not the control computer and is not to be interpreted Status Condition Status information is only available in addressed mode The low level status condition of the instrument is reported to the control computer when addressed to TALK with the SECONDARY address 15 active The full status condition of the instrument is reported to the control computer when addressed to TALK with the SECONDARY address 16 active Dialogue Output Format When dialogue output format is selected English text replaces the output code for each notation code Received Command NO Output is PRESSURE SET POINT PANEL lt Value 7 gt lt Units 6 gt MODE REM LOC RANGE 1 ERROR Error report if appropriate Received Command N1 Output is PRESSURE SET POINT PANEL lt Value 7 gt lt Units 6 gt ERROR Error report if appropriate K163 Issue No 3 4 Operating Instructions 4 25 Received Command N2 Output is CONTROLLER ON OFF INTERRUPT ON OFF IN LIMIT ERROR EOC ISOLATION ON OFF Received Command N3 Output is OUT OF LIMIT IN LIMIT ERROR Error rep
8. P This command allows a new pressure set point to be entered Its value is the new set point in the current units The control value is a number corresponding to the new set point demand pressure in the current units Example P 10 5 Sets the set point to 10 5 in the currently selected units 4 4 11 Ratio This command sets one of the twelve preset division ratios The current set point is then divided by this ratio The command takes the values 0 to 11 Refer to Section 3 9 5 Example If Preset 5 is set to 5096 and the current set point pressure is 20 bar then issuing the command amp 5 Sets the set point pressure to 10 bar 50 of 20 bar 4 4 12 Preset This command selects one of twelve preset values It takes the value 0to 11 refer to Section 3 9 5 Example 5 Selects preset 5 K163 Issue No 3 4 Operating Instructions 4 11 4 4 13 Error Reporting On Off This command turns error reporting on or off It takes the value 0 for OFF and 1 for ON When turned ON errors are reported as part of data output as defined in Section 4 5 Example 1 Enables error reporting 4 4 14 Rate J Selects the rate of change of pressure used to achieve set point The rate is as programmed on the function keys 0 rate programmed on key F1 1 rate programmed on key F2 2 rate programmed on key F3 Example J1 Selects the rate programmed over the F2 function key 4 4 15
9. 1 Introduction 1 5 Options Option A1 Combined non linearity hysteresis and repeatability E 0 05 of reading 20 to 100 full scale rinee te 0 01 of full scale 0 to 20 full scale Temperature Coefficient seen 0 00296 rdg C averaged over 10 to 30 C Option A2 Combined non linearity hysteresis and repeatability Laia wamaqa atya a alaq E0 02596 of reading 20 to 100 full scale Saa aaa nn rest an esse anne destin een nn 0 005 of full scale 0 to 20 full scale Temperature Coefficient 0 002 rdg C averaged over 10 to 30 C Option B Negative Calibration Error as a percentage of ve full scale Value depending on the accuracy option chosen Accessories The instrument is despatched with the following items User Manual K163 Calibration Certificates Power Supply Lead K163 Issue No 3 1 6 DPI 520 User Manual 1 2 APPLICATIONS 1 2 1 Control by Remote Computer via IEEE 488 Using the IEEE 488 general purpose control bus a remote computer can control either a single stand alone unit or a number of units up to a maximum of 15 When controlling a number of instruments each instrument on the bus is allocated a unique address set with the instrument via a SETUP facility Each instrument is first addressed and then instructed by means of control codes to carry out the required functions e g mode change output pressure change rate change or send
10. operation completed Err011 Set point too high for range Reduce set point value Err012 Remote enable Not in remote Issue R1 command Err013 Invalid entry Value entered is outside operational limits Revise value Err014 Using alter initialises set up Before proceeding make sure that a change to set up is required Err015 Not applicable Err016 Vent time too long Zero function fails to operate as venting takes too long Err017 Valve overtemperature Apply or release valve or both overheating Allow to cool Controller parameters may require adjustment See Section 3 9 2 controller set up Table 6 1 Error Codes K163 Issue No 3 6 6 DPI 520 User Manual 6 5 2 Controller Fault Symptoms No outlet pressure when setpoint entered and controller switched on Solution Check that the communications link is working Check that source pressure is 110 of the F S pressure Check supply filter and pipe for blockages Possible apply release or isolation valve fault Symptom Controller instability Excessive acoustic noise from instrument Solution Check instrument for a pneumatic leak Run pneumatic self test refer to Section 3 9 2 Check that the source pressure is within the operational limits refer to Section 1 Check output system for pneumatic leak Set up controller pa
11. to the right looking at the rear panel of the instrument e g CS CALIBRATION MODE This action switches the instrument into the Cal mode and if a PIN number has been set up refer to Section 3 9 2 the display will be as follows e g Calibration Mode Enter P I N Enter the appropriate PIN number press lt and the calibration menu will be displayed as follows This display will appear immediately that Cal is selected if no PIN number has been set up Select Mode Cal Test Test This option of the calibration menu provides an indication of the instrument s status This facility is primarily an engineering function The temperature reading representing the temperature inside the transducer is only valid if the instrument is one of the high accuracy options options A1 or A2 and valid calibration data exists The DVM reading gives an indication of the number of counts representing the current pressure in the DVM s analogue to digital converter For full scale applied pressure this nominally represents 2 5V 20 14 Temp Deg C 2 5000 DVM K163 Issue No 3 5 Calibration 5 5 5 3 2 Calibration Cal Selection of this option of the calibration menu immediately initialises a calibration routine for the digital to analogue converters which is displayed as follows e g 2 565 Cal DAC Please Wait After a few seconds the Cal menu will be displayed e g 2 Point Linearity Quit These opt
12. 0 to 7 to determine the event as follows No interrupt all interrupts are disabled Interrupt on Error Interrupt on In limit Interrupt on In limit and Error Interrupt on End of Conversion Interrupt on Error and End of Conversion Interrupt on In limit and End of conversion Interrupt on In limit Error and End of conversion OOO N Error This occurs when a command s syntax is not understood or the command s parameters are out of range In Limits When a new set point is entered the wait timer is reset see W command When the reading is within 0 05 FS ofthe set point the wait timer is decremented once a second if outside these limits then the timer is reset to its original value When the timer reaches zero then in limits signal is generated End of Conversion Each time the instrument has a new reading approximately 0 7 second this event is generated Example 15 Sets an interrupt on error and end of conversion Wait W Selects the wait time before the in limits signal is active It takes a value which is the wait time in seconds 0 to 100 Example W12 Sets the in limits wait time to 12 seconds K163 Issue No 3 4 4 10 DPI 520 User Manual 4 4 9 Controller On Off C Turns the controller on off it takes the value 0 or 1 as follows O controller off 1 controller on Example C1 Turns the controller on 4 4 10 Pressure Set Point
13. 33 Self Lest Pneutnallc u rrr niente teme aerias 3 34 3 9 3 Set up COMMUNICATIONS sin 3 36 3 9 4 Set up More Scale Zero More ssriiriinsiiiiiiainr ins 3 45 3 9 5 More Set point and Rate 3 47 K163 Issue No 3 vi DPI 520 User Manual Section Page 4 OPERATION uu asna B dha eee weiner eRe 4 1 4 1 LOCA MOE ss sais ics cicsusssssbdcsntsacedeesebeuashsassansdecseedsasssanstacsedosuebeaddbantsaensnnicisdassvass 4 1 4 2 Remote MOG oerte unu ua e a e ee ae ETEO Eir i 4 1 4 3 DSTA 1R Aoo E EEE A AE uua FEY iC eroe De ebay LE PEE SER UE S uda Te TERN PsC Page e dn 4 1 4 3 1 Control Code FORMAT nin creer EE ED VE ar LER EE eda 4 2 4 3 2 Implementation of checksums sssm e 4 3 4 4 Command DescripliOn u Uu aa a aaisan Susa asa 4 6 4 4 1 Set to Local Mode M nad rh oer RR Fare c ax e e Rara Ree ea 4 6 4 4 2 Set Mode R suuuiaanicaiig eiii tespe aqa aie ua ELE EON EEN 4 6 4 4 3 Set Scale Unit S esses enne nnn nnns 4 7 4 4 4 UU 4 4 5 Data Select D 4 4 6 Output Data Format N uuu s ne Aan ene 4 7 4 4 7 Intermupt suuin rm eerte te Lone EIE ERU 4 9 4 4 8 Wait e ANN M H 4 9 4 4 9 Controller OMO C8 de espace vasa irn e exa Fera e bus Era vt vancedenciesaaes sade 4 10 4 4 10 Pressure SetPoint PP inis i c cet se ko rec ei a EE a E XX ETE RE ER 4 10 4 4 11 Ratios Portes t etsi tM MeL i nS f b dedo 4 10 4 4 12 xp tL 4 10 4 4 13 Error Reporting On Off Qg aia iecit reete
14. DPI 520 instruments These remote interface units types RUI 100 desk top and RUI 101 rack mounted plug into special user interface sockets located on the front and rear panels respectively The Remote User Interface is automatically powered as soon as it is plugged into a controller The RUI assumes that the controllers have a common pressure output Using instruments with different pressure ranges permits a wide range of accurately controlled pressures to be applied to a single outlet Figure 1 2 shows the general arrangement Refer to K181 for details of RUI 100 101 connections K163 Issue No 3 1 8 DPI 520 User Manual CABLE ASSEMBLY STACKING CABLE CAPTIVE ASSEMBLY RU CABLE Ooogooooo 000000000 PRESSURE OUTLETS COMMONED Figure 1 2 Control from a Remote User Interface K163 Issue No 3 2 Functional Description 2 1 2 2 2 2 1 FUNCTIONAL DESCRIPTION General The DPI 520 instrument is a single channel pressure controller designed to be programmed either from an external computer system or remote user interface No user controls are provided on the instrument it s local keyboard being used only for set up calibration and maintenance operations The use of these functions are described in Sections 4 and 5 respectively Digital programming of the instrument is effected via a RS232 serial interface or via an IEEE 488
15. Do not use replacement parts other than those supplied by the manufacturer or manufacturer s agent K163 Issue No 3 EE 6 2 DPI 520 User Manual 6 2 Fuse Replacement If when an a c mains power supply is connected to the instrument the instrument fails to operate replace the power supply fuses as follows refer to Figure 6 1 O Isolate the external power supply and remove the IEC mains connector 1 NOTE If rear access to the rack is restricted it may be necessary to partially or completely withdraw the unit If the unit has to be withdrawn all pressure supply inlet and outlet lines must first be isolated O Remove the fuse carrier 3 from the power supply inlet socket 1 and remove both fuse cartridges Replace both fuse cartridges 4 NOTE It is essential that the correct type of fuse is fitted to the instrument Before fitting the replacement fuses into the fuse carrier check that they are both of the same type and rating 20mm Type T2A rating 250V 2A Also check each fuse for continuity O Replace the fuse carrier assembly 3 complete with fuses into the power supply inlet socket 2 O Replace the IEC mains connector 1 If the unit was withdrawn from the rack before replacing check that the pressure connections are still tight Do not over tighten O Switch on the power supply The display should now operate O If the fuse s blow immediately on switch on contact the manufacturer or S
16. FS ft kg LSD Pa PIN mA mH 04 mm MSD N C No PRESS PTX RDG RS 232 SCPI VAC alternating current atmosphere degrees Celsius degrees Fahrenheit common centimetre squared continued direct current digital multimeter device under test enter full scale feet kilogram Least significant digit Pascal personal identification number milli Amperes metres of water at 4 C milli metres most significant digit No Connection number pressure pressure transmitter reading serial data transmission standard Standard command for programmable instrumentation tare vacuum K163 Issue No 3 Contents V Section Page 1 INTRODUCTION aasan aza Der ta asa esta eee 1 1 1 1 Instrument SPecifiCation ient peiiini aeai dinaan 1 2 1 2 Applications E RIEN 1 6 1 2 1 Control by Remote Computer via IEEE 488 a 1 6 1 2 2 Control by Remote Computer via RS232 sss 1 7 1 2 3 Control by Remote User Interface sss 1 7 2 FUNCTIONAL DESCRIPTION iii 2 1 2 1 General 2 1 2 2 Instruments Electronics eco Rode te emt d sede ute Rate ets 2 1 2 2 1 Didital ElectroniGS 2 dee ni eie redo Hed Eee ende spa 2 1 2 2 2 Analogue Circuit Operation keniii gsi neni niaaiesies raais 2 3 3 INSTALLATION P 3 1 3 1 Safety InstEUCHofl errore ete eee eed c hela eae 3 1 3 1 1 Input Output Connections essem 3 1 3 1 2 Rack MOUNTING uu lu
17. JT S estate esse ea 2 5 1 5 4 Calibration Check encierra etta teet de ex ed eee ax deri sa uka eich 5 1 5 2 Calibration Adjustment uu uu cet iinet henna 5 2 5 2 1 General PFOCedUres iere stetit Pe HR RRE enn etude deu iun 5 3 5 3 Using the Calibration Menu 5 4 5 3 1 nme 5 4 5 3 2 Calibration Gal n eaten weil teet ain 5 5 5 4 Checking Linearity Calibration enm mm 5 6 5 5 Full Scale and Zero Adjustment sssssseee e 5 7 5 6 Non Linearity Adjustment ULU enm 5 8 6 MAINTENANGE 5 irte do a esee Tee D ret EP k AS eco etus 6 1 6 1 Safety Instr ctlOns eren oo uuu u uu eme prie tene asa endi ete arma rennes bte 6 1 6 2 Fuse Replacement 38e cereo tte eder ee e de x SERRE e EDD e i eel 6 2 6 3 Replace Vent Source and Outlet Manifold Filters 6 4 6 4 rpm 6 4 6 5 ael M 6 4 6 5 1 Error Codes uu 6 5 6 5 2 Controller Fault 2 Woda c Mt Aa tite 6 6 6 6 Approved Service Agents 6 7 K163 Issue No 3 viii K163 Issue No 3 1 Introduction 1 1 1 INTRODUCTION Description The DPI 520 is a programmable pneumatic pressure controller intended for applications in automatic pressure testing and calibration A rugged Druck piezo resistive transducer measures pressure and is compen sated to standard or enhanced accuracy as required Dual loop control provides
18. K163 Issue No 3 3 Installation 3 11 3 5 2 Connecting to a Computer The connection method for RS232 operation between a host computer and the instrument depends on the handshaking method to be implemented and the type of connector used on the computer s output port Table 3 1 shows the connections and the following schematic diagrams detail the correct wiring information Connections to the instrument should be made to the 9 pin D type connector labelled RS232 and the switch labelled STACKING located on the rear panel should be set to the O position as shown below 0 C 1 STACKING Two methods of setting up the computer connections are provided Refer to section 3 6 3 and figure 3 14 for RS232 set up details K163 Issue No 3 3 12 DPI 520 User Manual e Software Handshaking Computer with 9 pin D type Connector For software handshaking between the instrument and a host computer or printer that uses a 9 pin D type port connection proceed as follows O Connect pins 6 4 and 9 together and link pins 7 and 8 atthe host connector end of the cable O Connect the host comms port to the DPI 520 instrument s 9 way D type RS232 port connector as shown in Figure 3 4 O Use the setup comms menu see Section 3 6 3 to set up the required RS232 parameters X 4 X should be set to Enabled RXD TXD GND CTS RTS DTR DSR RSLD COMPUTER PRINTER DPI 520 RS232 Figure 3 4 RS232 9 Way
19. K163 Issue No 3 IE DPI 520 User Manual Pascal kPa kilo Pascal MPa mega Pascal mbar millibar bar bar kg cm kilogram per square centimetre kg m kilogram per square metre mmHg millimetre of Mercury cmHg centimetre of Mercury mHg metre of Mercury mmH O millimetre of water cmH 0 centimetre of water mH 0 metre of water torr 1 760 x 1 atm 1 mm Mercury atm atmosphere psi pound per square inch Ibf ft pound force per square foot inHg inch of Mercury H O04 inch of water 4 C H O04 feet of water 4 C SPEC L Special Unit H O20 inch of water 20 C H O20 feet of water 20 C hPa hecta Pascal Table 3 2 Scale Units K163 Issue No 3 3 Installation 3 47 e Zero There are three zero modes for the DPI 520 Manual Timed and Auto Each mode can be enabled and disabled under the set up More option Manual Zero The manual zero facility enables the instrument to be instructed to perform a zero operation by the O command O1 Two versions of a manual zero are available a Zero without closing the isolation valve when manual zero is set to Enabled b Zero after closing the isolation valve when manual zero is set to Isolated Await period can be programmed for each option The wait period is the period following a zero
20. Specific Commands These commands are available only over addressed RS232 Unlisten Untalk Interface Clear Instrument Addresses Addressed Device Clear Dialogue Mode Instrument FS type S N Talk Listen T lt Add gt 19 Add Instrument Talk L lt Add gt 11 Add Instrument Listen Table 4 4 RS232 Specific Command Checksums NOTE Added values are the ASCII checksum ofthe value not the actual value Table 4 5 gives the decimal values of the ASCII characters The checksums are calculated on a command by command basis Therefore for maximum data integrity each command should be sent individually with its checksum appended Blocks of commands should not be used because the cause of the checksum error cannot be detected 4 7 5 DPI 500 Mode The DPI 500 Mode enables the instrument to become compatible with existing DPI 500 instruments When YES is selected the decimal point is not sent in data from the instrument K163 Issue No 3 4 Operating Instructions 4 29 4 7 6 ASCII Values Table 4 5 which provides details of the decimal values ofthe ASCII character set is provided for reference purposes NUL SOH CTRL A STX CTRL B ETX CTRL C Apostrophe EOT CTRL D ENG CTRL E ACK CTRL F BEL CTRL G BS CTRL H Comma HT CTRL I Minus LF CTRL J F Stop VT CTRL K FF CTRL L CR CTRL M SO CTRL N SI CTRL 0 DLE CTRL P
21. can be restricted against unauthorised entry by a four digit Personal Identification Number PIN When the equipment is first supplied no PIN is entered Set up comprises a menu structure the highest level of which divides into three basic menus termed Menu Comms and More Each of these menu options further divides into a number of sub levels giving access to specific parameters Figure 3 11 shows the menu hierarchy and gives an overview of the functions accessed under each menu option A detailed description of the set up proce dures covered under each menu option follows Each sub menu provides a range of option statements for the programming of functions and options The functions are extended to one of three function keys labelled F1 F2 and F3 Pressing the appropriate function key selects the allocated function as summarised below Alter Select the next option e g a baud rate from the list of options allocated to that function Where only two options are provided Alter will toggle between the options Next Moves to the next function down under the current option Quit Returns to the menu level Enter Request for entry of a numeric value Enter value from numeric keypad terminating entry with Enter Yes Immediate action implemented K163 Issue No 3 3 27 Installation 3 onl 81n 9n13g nuon dn 3eS LL inBi3
22. common Source pressure to ensure that the source pressure for each instrument does not exceed the maximum level for that instrument and to obtain the specified control performance appropriate external pressure regulators must be provided refer to Fig 3 10 K163 Issue No 3 IE 3 20 DPI 520 User Manual O Ensure that the source pressure supply is isolated from the supply line It is recommended that a 40 micron filter regulator and an isolation valve be fitted between the pressure source and the instrument as follows e g i m INSTRUMENT e I SUPPLY SUPPLY I ISOLATOR REGULATOR FILTER The instrument does have filters fitted internally but only to protect against ingress of large particles see section 6 3 for cleaning Using an additional external filter prevents the internal filters from becoming blocked O Fitthe source pressure supply line to the Source connection port as shown in Fig 3 9 fitting a bonded seal between the pressure union and the measuring port Note the Source port has a G thread Ensure that the coupling is tight mr Fig 3 9 Pneumatic Connections K163 Issue No 3 3 Installation 3 21 SUPPLY SOURCE 1 L OUTPUT 1 DPI 520 1 REGULATOR SOURCE2 OUTPUT 2 DPI 520 2 REGULATOR SOURCE 3 OUTPUT 3 3 s DPI 520 3 Fig 3 10 Source Output Connection Schematic Output Pressure Port Fig 3 1
23. current output pressure A special application of this mode of control allows the output pressure ports of a number of controllers to be connected together into acommon manifold By using instruments with different control pressure ranges this permits a wide range of accurately controlled pressures to be applied to a common manifold Figure 1 1 shows the general arrangement Section 3 contains details for the installation of this configuration of instruments IEEE 488 ADDRESS 1 EH INDIVIDUAL PRESSURE ADDRESS N 15 MAX 2 P oss aooress E C appress3 B STACKED INSTRUMENTS ONE COMMON PRESSURE OUTPUT Figure 1 1 Control by Remote Computer via IEEE 488 K163 Issue No 3 1 Introduction 1 7 1 2 2 1 2 3 Control by Remote Computer via RS232 e PC to Instrument A single instrument is connected directly to a computer and communications canbe controlled either by full hardware handshaking or software handshaking Section 3 Installation details the connection method for both options e Instrument to Printer A stand alone instrument can be connected to a non intelligent terminal or a printer In this mode the instrument provides a continuous flow of data ona timed basis Interconnection details are the same as for the connection of a control computer and are given in Section 3 Control via Remote User Interface Two types of Druck Remote User Interface can be used to control up to three
24. on the controller If the rear of the instrument is protected from direct access by personnel then no fittings need be used and the vent port discharges directly to atmosphere Where personnel access is possible the vented gas should be piped away to a safe area For gauge instruments connection of a vacuum supply will assist in the controlling of low pressures around zero Fit the vent line to the Vent port as shown in Fig 3 9 fitting a bonded seal between the pressure union and the measuring port Note that the Vent port uses a G thread fitting Ensure that the coupling is tight O Negative Gauge and absolute For negative gauge pressure applications a vacuum pump should be connected to the Vent port The pump should be rated for the desired low pressure and have suitable flow capability Care should be taken to avoid oil contamination from the pump from entering the controller It is good practise to fit a solenoid valve energised from the pump s electrical supply such that the vacuum is automatically released when the supply is interrupted Refer to specification for details of vent pressure range Reference Port The reference port is used on gauge instruments It is the port which supplies pressure to the reverse side of the measuring transducer Normally this is atmospheric pressure Ambient pressures acting on the reference port of low pressure instruments can have significant effects on the pressure reading A restrictor scre
25. parallel interface The instrument can be configured in a number of different ways as detailed in Section 1 Section 3 details the installation procedures Instrument Electronics Digital Electronics Fig 2 1 The instrument draws it s power supplies from an internal power supply unit which is in turn powered from an external a c source An internal microprocessor system controls the RS232 and IEEE 488 communications channels One RS232 port is provided and one IEEE 488 channel The RS232 port has three inputs one of which is used for host communications The other two are used for the connection of either the Druck RUI 101 rack mounted or the RUI 100 desktop Remote User Interfaces Although there are three RS232 connectors on each instrument one RS232 and two User Interfaces effectively they access only a single RS232 processor port A switching network has auto detection ofthe presence of a Remote User Interface RUI plugged into one or other of the RUI sockets K163 Issue No 3 2 2 DPI 520 User Manual The microprocessor system also controls the flow of data to the instrument s display The display is a two line 20 characters line liquid crystal dot matrix type Operationally it is used to display pressures functions and messages A keyboard linked to the microprocessor provides a user interface for set up and calibration purposes only It is not used for normal operation all operational commands being
26. the following provided CR Carriage Return LF Line Feed CR LF Carriage Return and Line Feed both Mode Used to select method of operation Choice of either Direct Addressed or Printer Direct Used for one to one communication applications Addressed Used for applications where more than one controller is connected to a loop A unique address in the range 0 to 99 must be allocated to each controller on the loop using the Address function Printer Used to continuously output data to a printer Frequency of output depends upon PRINTER N VALUE setting which can have a value within the range 1 to 9999 1 Values output after every update 2 Value output after every 2 updates 3 Value output after every 3 updates etc Value output after a maximum value of 9999 updates K163 Issue No 3 Installation 3 41 Baud Rate Allows data transfer rate to be selected Baud rates available are 110 150 300 600 1200 2400 4800 9600 19200 Parity Allows selection of parity checking method Choice of Odd Even or None Output Selects data output mode Two options are available Computer and Dialogue Computer Returns readings as values Dialogue Returns readings in English Text End device Marks an instrument as the last device on a daisy chain Designed to stop characters being echoed back roud the loop Command takes one of two values YES this is the end device or NO Not an end device Xon Xorr Used for soft
27. to any figure within the range 0 to 110 Theratios are numbered Ratio 0 through Ratio 11 These ratios are called by the 0 through 11 commands 0 calling Ratio 0 and 11 calling Ratio 11 Ratio is expressed as a percentage of current scale reading i e if the instrument is currently controlling at 50 F S pressure selection of Ratio 965 50 would result in a set point of 25 F S 50 of current reading 50 O Preset Selecting the Preset mode from the set point option provides a sub menu of twelve ratios figures represent pressure in current units The factory default values for these ratios provide twelve 10 F S pressure steps from zero to 110 of full scale e g for a 2 bar F S instrument Preset 0 would be set to 0 bar Preset 1 to 0 2 bar and Preset 11 2 2 bar Set up provides the facility to set each of these preset pressures to any desired pressure value within the range 0 to 110 F S The presets are numbered Preset 0 through Preset 11 These ratios are called by the 0 through 11 commands O calling Preset 0 and 11 calling Preset 9611 If for example a 2 bar instrument was controlling at 50 F S pressure 1 bar selection of Preset 11 2 2 bar would result in a new set point of 110 F S 2 2 bar being established The controller output would move to this level at a rate determined by the Rate settings K163 Issue No 3 3 Installation 3 51 Rate Rate provides three possibili
28. 0 Depending on the application the Output ports of instruments with differing full scale outputs can be either be connected separately or connected together in parallel When connected in parallel only one instrument can be used at a time and the lower ranges must have their isolation valves closed to avoid damage The connection method is as follows O Ensure that the external system is at zero pressure O Fit the output pressure line to the Output connection port as shown in Figure 3 9 fitting a bonded seal between the pressure union and the measuring port Note that the output port has a G thread fitting Ensure that the coupling is tight K163 Issue No 3 IE 3 22 DPI 520 User Manual Vent Port When the controller reduces the outlet pressure gas flows from the user s system out of the Vent port of the controller Initially this port can be at the full working pressure of the system Any equipment connected to the vent port e g pipes fittings and vacuum pump must be capable of handling the flow pressure safely Refer to specification for details of vent pressure range O Positive Gauge Pressure Control Where only positive pressure is to be controlled then the vent port simply needs to be able to discharge system pressure to atmosphere Care needs to be taken because the initial discharge pressure is the outlet pressure On high pressure ranges acoustic noise will be produced when a fast rate is selected
29. 3 1 Introduction 1 3 Electrical Specification Power Supplies AC Supply Voltage 3 sexist ridere eani ienaa Era RSET 88 to 264 V Supply Frequency iii 47 to 65 Hz Eo T 60 VA Communications Interfaces The controller provides two digital communications channels an RS232 and an IEEE 488 channel Three RS232 connections are provided but all of these access a single processor port Analogue Output Type uyana PM Single ended D C voltage representing controller output pressure referenced to instrument ground Bandwidth unn EE 2000 Hz to 6 dB Ranges Fixed to order with full scale output in one of the following ranges EU 0 to 2V 0 to AV 0 to 5V 0 to 10V PACCUNA Vo uuo tore teet indecl e dore Rasse Pies autas terme ee ee 0 3 full scale Temperature Error Band 0 5 F S 0 to 40 C Source Impedance lt 10000 Input Output Connections and Controls Rear Panel Pneumatic Connections Source Vent and Outlet eerie becas G1 8 female Nae Em M5 female Electrical Connections Analogue Output isiin BNC connector centre ve shell ve Host RS232 erreen 9 pin D type connector wired for point to point RS232 on pins 2 and 3 User Interface RS232 u 9 pin D type connector for con
30. 3 Issue No 3 4 16 DPI 520 User Manual e Parameter Definitions Value Mode Range Scale Value source Terminator Error status code value selected by the D command signed integer or floating point When the instrument value is sent the format is a 6 digit value plus decimal point The value can be preceded by spaces to complete the 6 digit value If the value is negative a ve sign is placed at the front of the value REM or LOC remote or local RO or R1 local or remote SO to S3 reports S status D0 to D2 reports D status lt CR gt lt LF gt lt SPACE gt present if error reporting is enabled and error present command Error code is stored as bits in a byte Bit O Command not accepted Bit 1 Secondary address not available Bit 2 Data string not valid Bit 3 Reading in limits Bit 4 Over range reading exceeds transducer range or 99999 Bit 5 End of conversion Bit 6 Valve over temperature Bit 7 Checksum error Controller status Interrupt code Isolation valve status CO or C1 reports C status 10 to I7 reports I status F20 Isolation valve off F21 Isolation valve on K163 Issue No 3 4 Operating Instructions 4 17 Notation code NO to N8 reports N status Error reporting 0 or 1 reports status Wait time W followed by 3 digit ASCII value Limit status 0 or 1 0 out of limit 1 in limit Terminator code String terminator w
31. Connections Software Handshaking K163 Issue No 3 3 Installation 3 13 Computer with 25 pin D type Connector For software handshaking between the instrument and a host computer that uses a 25 pin D type port connector proceed as follows O Connect pins 6 8 and 20 together and link pins 4 and 5 at the host connector end of the cable O Connect the host computer communications port to the DPI 520 instrument s 9 way D type RS232 port connector as shown in Figure 3 4 O Use the setup comms menu see Section 3 6 3 to set up the required RS232 parameters X 4 X should be set to Enabled RXD TXD GND CTS RTS DTR DSR RSLD 8 COMPUTER PRINTER DPI 520 RS232 Figure 3 5 RS232 25 way Connections Software Handshaking K163 Issue No 3 IE 3 14 DPI 520 User Manual e Hardware Handshaking Computer with 9 pin D type Connector For hardware handshaking between the instrument and a host computer that uses a 9 pin D type connector proceed as follows O Connect the host communications port to the DPI 520 instrument s 9 way D type RS232 connector as shown in Figure 3 6 O Usethe setup comms menu see Section 3 6 3 to set up the required RS232 parameters NOTE Some computer installations do demand hardware handshaking Its use is not recommended unless so demanded The additional wiring and logic operations may cause problems RLSD 1 RLSD RXD 2 TXD
32. DELIMITER is not mandatory but can be any of the following 3 an SPACE Example R1 S0 P 123 45 W20 lt CR gt Sets remote mode units as on F1 pressure set point 123 45 wait time 20 sec K163 Issue No 3 4 Operating Instructions 4 3 4 3 2 Implementation of Checksums The RS232 and IEEE488 communication protocol on the instrument have a user selectable checksum option This increases the validity of data transfer The checksum protocol is bidirectional the instrument can generate checksums for outgoing data and check checksums for incoming data Checksums should only be used in Computer mode Checksum definition The checksum used is an ASCII character addition mod 100 two digit ASCII representation checksum This makes decoding by the host computer relatively simple e g The code to place the instrument into remote mode is R1 This can be broken down as follows R ASCII code 82 1 ASCII code 49 Total 131 Mod 100 31 Therefore to send R1 with the checksum R1131 should be sent The signifies the start of the checksum Data from the instrument would be sent as follows 0 001REMR1S0D0 22 22 is the checksum K163 Issue No 3 4 4 DPI 520 User Manual Checksum setup Under setup comms RS232 or IEEE refer to Section 3 9 3 set the following values None No checksum is used This is equivalent to the comms on the DPI 510 pressure controller Auto Thi
33. DPI 520 User Manual i DPI 520 RACK MOUNTED PRESSURE CONTROLLER DPI 520 Pressure Controller Software Issue This User Manual supports Software Issue No 3 XX Druck Limited 1998 This document is the property of Druck Limited and may not either in part or whole be copied or otherwise reproduced communicated in any way to third parties or stored in any Data Processing System without the express written authority of Druck Limited K163 Issue No 3 ii DPI 520 User Manual SAFETY The Manufacturer has designed this product to be entirely safe when operated correctly Please pay close attention to the Safety Instructions outlined on this page and elsewhere in this manual They have been designed to protect the user from personal injury and the equipment from damage means of a hazard warning triangle Specific warnings relating to each section of the manual are given at the beginning of that section On the instrument this symbol indicates that the user should refer to the User Manual f Potentially hazardous operations are indicated in the text by Please observe the installation advice and any operational limits given in this manual This equipment must only be used for the purpose for which it was designed Pressure Safety Do not permit pressures greater than the Safe Working Pressure to be applied to the instrument The specified Safe Working Pressure for the instrument is stated in the Spe
34. Following entry of the second point the 2 point calibration is complete and the instrument returns to the calibration menu O Repeat the calibration check to see that the correction has been effective NOTE Follow display prompts to exit calibration mode or the error message EEPROM Failure will be displayed Non Linearity Adjustment Before any linearity compensation procedures are carried out perform a 2 Point calibration followed by a linearity check to determine whether or not full linearity compensation should be carried out If the linearity calibration check shows linearity errors perform a linearity compensation as follows TEM PRESSURE BEFORE DISCONNECTING OR CONNECT TURN OFF THE SOURCE PRESSURE AND VENT THE SYS A ING ANY PRESSURE LINES PROCEED WITH CARE O Isolate and disconnect the pressure supply source O Vent the pressure on the system side of the instrument and disconnect the pressure connection to the outlet port Connect the outlet port of a pressure standard to the instrument s outlet port Set the Cal switch located on the rear panel to the 1 position Wait one hour to allow the instrument to stabilise Q O Q Enter the calibration menu as outlined in Section 5 3 and 5 3 2 K163 Issue No 3 5 Calibration 5 9 O Select Linrty from the calibration menu and the following prompts will be displayed e g Pressure Pt1 Enter when stable Setthe pressure standard to the required
35. PI 520 User Manual 4 4 Command Description The following sections describe the commands in the order listed in Table 4 1 4 4 1 Set to Local Mode M This command places the instrument into local mode Example M Puts the instrument into local mode see also R command 4 4 2 Set Mode R This command places the instrumentinto either local or remote mode and turns the controller off Value 0 sets the instrument to Local and value 1 to remote mode Example R1 Puts the instrument into remote mode K163 Issue No 3 4 Operating Instructions 4 7 4 4 3 4 4 4 4 4 5 4 4 6 Set Scale Units S This command selects the pressure units Ittakesthe value 0to 3 S0to S2 select the units set up for the function keys F1 to F3 S3 selects the units configured by the U command Example S2 Selects the units configured by the F3 function key Units U Used in conjunction with the S3 command this command allows any of the instrument s units to be selected The command takes a value which defines the required unit See Table 4 2 for available units Example S3 U4 Selects mbar pressure units Data Select D The D command determines the source of data returned following a data request for Notations NO and N1 It takes the value 0 to 2 as follows 0 send current pressure 1 send current set point pressure demand 2 send the reading on the front panel Example D1 Sets the data sourc
36. Ranges Output Pressure ALTE PES 0 to 70 bar absolute M 1 to 70 bar gauge maximum 2 bar line pressure on gauge units Maximum Safe Working Pressure EE MN 125 full scale pressure Source Pressure Range Positive presSUFe assinalar rale roe veined 105 to 115 96 full scale Negative pressure Lowest pressure used less 596 Accuracies Assuming regular zeroing of the instrument the following figures apply Combined non linearity hysteresis and repeatability Standard Instrument ssesssssssssssseeeee 0 05 full scale Option Al u l um GSS uqa asus q Refer to Options Page 1 5 Optom A ul qas Refer to Options Page 1 5 Temperature Coefficient The temperature coefficient averaged over 10 to 30 C Standard Instrument Q asss sss asssSusasssasassasus 0 01 Reading C Options A1 and A2 Refer to Options Page 1 5 Stability NOTE The following figure indicates 90 day stability and assumes regular use of the zero facility nie reste nada der en 0 015 of reading Negative Pressures Option B Specification as per positive pressure but calculated as a percentage of the positive full scale Controller Performance Controller Stability uuu uuu t tet shes amants 40 ppm of Full Scale Fill RATE reiner teret epe eek eR rU ERS Dependant upon system volume K163 Issue No
37. Rear Panel Connections K163 Issue No 3 3 Installation 3 3 3 2 3 2 1 3 2 2 Electrical Connections Electrical Safety Instructions PLY SETTINGS OPERATING VOLTAGE RANGES ARE MARKED ON THE REAR PANEL OF THE INSTRUMENT AND ARE GIVEN IN SECTION 1 SPECIFICATION 0 IT IS IMPORTANT TO USE THE CORRECT SUP It is essential that the Earth lead coloured green yellow is connected to the a c Supply Protective Safety Earth Before making any electrical connections to the rear panel isolate the incoming power supply Before removing any covers isolate the instrument from all its supplies Power Supply Connections Fig 3 1 and 3 2 The instrument is powered from a c mains Section 1 Specification gives full details of the power supply requirements e A C Power Supply The a c power supply socket assembly 2 is located on the rear panel as shown on Fig 3 1 A fuse 4 is also contained within the power supply socket assembly 2 details of the fuse fitting being shown in Fig 3 2 K163 Issue No 3 IE 3 4 DPI 520 User Manual COOLING AIR FLOW Fig 3 2 A C Power Supply Socket K163 Issue No 3 3 3 3 3 2 3 4 Installation 3 5 To connect the a c power supply proceed as follows O Insertthe moulded IEC connector 1 into the power supply socket assembly 2 and connect to a suitable a c power source Refer to Section 1 Specification for power supply details O Switch on
38. Zero Instrument 01 This command initiates a manual zero on the currently selected pressure range Example O1 Zero s the current pressure range 4 4 16 Rate Value V Sets the rate to a value in current units per second The rate is automatically set to variable rate This value is not stored in non volatile memory Example V 1 2 Sets rate to 1 2 units per second 4 4 17 Isolation Valve Open Close E Controls the state of the isolation valve It takes the value 0 for closed and 1 for open Example E1 Opens the isolation valve K163 Issue No 3 4 12 DPI 520 User Manual 4 4 18 Open Isolation Valve F This command has been implemented for compatibility with the Druck DPI 510 pressure controller It takes the value of either 20 Isolation valve closed or 21 Isolation valve Open Functionally it controls the state of the isolation valve in the same way as the E command Example F21 Functionally the same as E1 Opens Isolation valve 4 4 19 Tare Value B This command sets a value to be tared from the measured pressure It takes the value of the tare in current units Example B1013 Sets the tare value to 1013 in current units 4 4 20 Tare On Off T This command initiates the subtraction of the tare value from the measured pressure It takes the value 0 for OFF and 1 for ON Example T1 Turns on the tare K163 Issue No 3 4 Operating Instructio
39. addition the following features concerned with access to one of several instruments are implemented O Address The address range will be 0 99 Each instrument will have an address and will be activated to respond to control data if the command string L lt address gt where address is that instrument address When so activated the instru ment is said to be a LISTENER Likewise an instrument can be activated to send a data packet with its current reading by sending T lt address gt When so activated the instrument is said to be a TALKER So that there can only be one TALKER on the ring at a time if a TALKER instrument detects the string T lt address gt where address is not its own address then it will return to a passive state K163 Issue No 3 4 22 DPI 520 User Manual Assuming for example that the address is set to 16 then L16 T16 put the instrument into listen mode causes the instrument to talk send a reading depending on the N and D code O Universal Commands The following commands will be acted upon irrespective ofthe instrument being a TALKER or LISTENER UNL UNT IFC ADD Un listen will de activate all LISTENERS Un talk will de activate the current TALKER Interface Clear will reset the communication link clear all buffers and clear dialogue mode unless this is established by instrument set up see DIA below This daisy chai
40. ansfer Control Lines Management Lines and a bidirectional address status bus The pin out of the connector is shown in Figure 3 3 K163 Issue No 3 o ANNOH9 91901 vc LL GND Z 01 GND zz GND IZ GND 02 GND 61 GND 8L L OL 6 8 9 801d 94 ZOIG SL 9OId rL snivis SOIC L NAVG YOIG OIQ cOld c LOIA L DPI 520 User Manual 318VN3 31ON3u Nati L NOLLN3 LIV NLY LL LSANOAY 39IAH3S OuS 0L uv319 39VJ3H3INI 941 6 AJILN3GI HO QN3 IO3 S d31d399Vv VLVG LON VGN 8 viva HO4S AGV3Y LON GAHN Z GVA v1va Ava 9 3 6 ANNOH9 91901 QN9 A0 SN VIVO IVNOILO3HIGIS LI4 8 SHfHOV 02S Idd eitqav 02S Idd H uGqv 02S Idd A JU n PUPU rt Cod HATIOHLNOO Fig 3 3 IEEE 488 Connection K163 Issue No 3 3 Installation 3 7 Separate ground connections are provided for each of the Transfer Control Lines and the IFC and SRQ lines all of which are run as twisted pairs in the IEEE 488 cable CAUTION For EMC compliance all leads must be less than 3M in length To connect up the IEEE 488 interface proceed as follows 3 4 1 Single Unit Installation Fig 3 1 O Plug an IEEE 488 connector cable assembly 11 into the IEEE 488 socket located on the rear panel of the instrument O Connect the other end of the connector cable assembly into the IEEE 488 socket on the host system O Change the IEEE co
41. ce of either RS232 or IEEE 488 as follows Setup Comms RS232 IEEE Quit Select RS232 and immediately the control settings either RUI PC or CUSTOM default setting PC will be presented e g O RUI This setting is used to quickly adjust the RS232 interface to work with a RUI 100 or RUI 101 To complete the RS232 set up for RUI use the instrument must be given a unique address number The address number can be in the range 1 to 16 and must be different to the address entered on any other DPI520s connected to the RUI If only the one controller is to be connected to the RUI the address does not need to be set To set the address press the Alter F1 key and then enter the address number and quit O PC Selects a setofcommunications parameters for RS 232 which are often used by a PC system The parameters set up by this setting are Terminator CR LF Mode Direct Baudrate 9600 Parity None Output Computer End Device No XoN Xorr Disabled Checksum Auto DPI 510 No K163 Issue No 3 Il o 3 40 DPI 520 User Manual O Custom This selection allows the user to set up all the RS 232 parameters as desired The method of selection is shown on Figure 3 14 The parameters are Address Used to set up a unique address in the range 0 to 99 for an individual controller Applicable only when using Addressed Mode see Mode Terminator Used to set up character appended to each output data packet Choice of
42. cific Table 4 1 gives a list of shared control codes The following sections describe each group of commands in the order in which they appear in Table 4 1 An asterisk indicates that the command is covered in Set up Section 3 9 K163 Issue No 3 4 2 DPI 520 User Manual 4 3 1 Control Code Format All values are coded as the ASCII equivalent commands and may be sent individually or in strings Symbols used to describe these ASCII codes are lt gt contain a parameter which is further defined additional optional values command specific contain actual ASCII characters to be transmitted The string format is lt CONTROL CODE gt lt CONTROL SELECTION gt lt CONTROL VALUE gt lt TERMIN ATOR gt lt DELIMITER gt Where CONTROL CODE gt is a single alpha character i e R This code must always be included lt CONTROL SELECTIONS is aan integer value which in conjunction with the CONTROL CODE specifies the operation of the command This is a com mand specific value and for some commands is completely omitted CONTROL VALUE gt supplies any numeric values required for the command The values take on the following format tae gt lt gt Where SIGN gt lt VALUE is not mandatory lt SIGN gt is or SPACE or no character for positive values and lt gt for negative values VALUE is ASCII numeric value TERMINATOR is CR carriage return
43. cification section of this manual Electrical Safety The instrument is designed to be completely safe when used with Options and Accessories supplied by the manufacturer for use with the instrument Toxic Materials During normal operation itis not possible for the user to come into contact with any hazardous substance which might be employed in the construction of the instru ment The use of hazardous materials in the construction of this instrument has been minimised K163 Issue No 3 Safety iii Repair and Maintenance This publication contains information and warnings which must be followed for safe operation and to maintain the equipment in a safe condition Use qualified personnel and good engineering practice for all procedures in this publication The operator must not use this equipment for any other purpose than that stated Do not apply a pressure greater than the maximum pressure stated Aqualified person must have attended a product training course given by the manufacturer or appointed agent and successfully completed the training course on this equipment relevant EEC directives Further details of applied standards may C This product meets the essential protection requirements of the be found in the product specification K163 Issue No 3 DPI 520 User Manual ABBREVIATIONS NOTE Abbreviations are the same in the singular and plural ac atm C F COM cm contd dc DMM DUT ENT
44. e Because of these variations it is not possible to publish fill time figures In practise small volumes such as one metre of pipe and a UUT can be filled to a good accuracy in less than one second The controller takes a few seconds to achieve control it is not possible to change pressure to the accuracy of this instrument instantaneously Maximising Valve Life The control valves used in the instrument are very robust and give a good operating life However some operating conditions cause more wear to the valve seats or the thermal protection sensor and should if possible be avoided Valve life will be maximised when O The correct supply pressures are available to the instrument for the working output range see page 3 21 O The controller is turned off when it is not necessary to control the pressure precisely Examples are when a test is complete at one pressure and there is a pause before moving on to the next pressure turn off the controller in the pause Also when atest is finished and the system is returned to zero pressure for the next UUT to be connected do not leave the controller on at zero pressure turn it off during the change over This will increase valve life and the operator s safety K163 Issue No 3 Installation 3 25 Control at Zero Gauge Pressure without a Vacuum Pump As mentioned under Optimum Source and Vent Pressures the instrument should have a negative pressure applied to the vent port f
45. e as current set point Output Data Format N Notation code selection Selects the format of the data when data is requested from the instrument The command takes the value 0 to 8 according to the required format Refer for detail to Section 4 5 Example N1 Sets the data format to reading only K163 Issue No 3 4 8 DPI 520 User Manual Pa Pascal kPa kilo Pascal MPa mega Pascal mbar millibar bar bar kg cm kilogram per square centimetre kg m kilogram per square metre mmHg millimetre of mercury o oO N oO a O N cmHg centimetre of mercury mHg metre of mercury mmH O millimetre of water N cmH O centimetre of water 99 mH O metre of water zx AR torr 1 760 x 1 atm 1 mm mercury zx oa atm atmosphere Oo psi pound per square inch N Ibf ft2 pound force per square foot inHg inch of mercury e H O04 inch of water 4 C N H 004 feet of water 4 C N SPEC L Special unit H O20 inch of water 20 C N N N w H O20 feet of water 20 C N hPa hecta Pascal Table 4 2 Scale Units K163 Issue No 3 4 Operating Instructions 4 9 4 4 7 4 4 8 Interrupt I The interrupt command sets the instrument to return a message when a specified event has occurred It takes the value
46. ect set up again and enter the set up controller menu If too higha value of stability is indicated by the check enter a new value of half the current setting and recheck the controller stability as detailed in ii an iii above Repeat if necessary increasing the entered value by 10 each time until the required stability is achieved If too low a value is indicated by the stability check double the current setting and recheck stability as detailed in i and ii Repeat if necessary decreasing the value by 10 each time v When satisfactory controller stability is achieved check the controller stability for an applied negative pressure step by programming a negative step from a set point of 80 full scale to 20 full scale Check that the controller acquires the demanded pressure without either oscillation or low frequency drift about the set point Readjust the stability setting if required K163 Issue No 3 Il o 3 32 DPI 520 User Manual O Autospeed 1 Auto speed sets the maximum rate of change exponential rise time that can be made in a single step between any setpoint value and another Auto speed can be programmed between 0 1 slow and a maximum of 1 fast The upper setting corresponds to 63 Press the Alter F1 key and in response to the Enter New Autospeed prompt enter the required factor on the numeric keypad and press the Enter key Select Next F2 to move on to Automax or Quit F3 to quit
47. ectly until the valve has cooled down Checksum error the checksum sent to the instrument was incorrect Therefore the command was not executed see Sections 4 8 4 and 4 8 5 In DPI 520 mode the error status code is sent as an hexadecimal number representation of the error status byte In the DPI 500 and DPI 510 modes bits 6 and 7 are not available and the error status code is sent as an octal number Example 01 indicates the code sent to the instrument was not executed Data string not valid and Over range error flags are set and only reset when the error has been cleared K163 Issue No 3 4 Operating Instructions 4 19 4 6 4 6 1 RS232 Specific The RS232 operates in two modes direct and printer Inthe direct mode the instrument is connected by a point to point connection to an intelligent controller control computer In the printer mode the instrument provides data spontaneously on a timed basis to drive a nonintelligent peripheral such as a printer Data from the instrument can be in computer format compatible with computer interfacing or for diagnostic work or direct operation from a VDU a dialogue format is available which sends data as plain English text Operation Using RS232 To use the system 1 Choose the Output Format a Computer Format In the computer format a rigorous alphanumeric system of status conditions and readings are sent by the instrument NOTE Cann
48. ervice Agent Alist of Druck Service Agents is given at the end of this section DO NOT ATTEMPT ANY FURTHER SERVICING PROCEDURES K163 Issue No 3 6 Maintenance 6 3 Figure 6 1 Power Supply Fuse Replacement K163 Issue No 3 EE o 6 4 6 3 6 4 6 5 DPI 520 User Manual Replace Vent Source and Outlet Manifold Filters To replace the manifold filters proceed as follows O Ensure that the supply pressure and system pressure are isolated from the instrument O Isolate the power supply and remove the IEC power supply connector O If removing the instrument from the rack to gain access to the rear panel the communications interface cables will also need to be removed O Remove the pressure connections from each of the ports and remove the vent silencer from the vent port O Using a screwdriver carefully unscrew and remove each filter plug and filter from the bores of the connection ports CAUTION Ensure that the screwdriver blade is narrow enough to clear the bore threads O Insert a new filter element into the recess on the top of the filter plug and carefully screw each filter plug into the bore of the port Check that the filter elements are correctly seated before tightening The elements can be examined through the centre hole of the filter plugs CAUTION Do not over tighten O Replace pressure connections communications interface connections refit power supply cable and refit the instrument
49. essure standard to the OUTLET port of the instrument under test Wait one hour to allow the instrument to stabilise Adjust the pressure standard to the most negative pressure value within the range of the instrument For positive reading instruments this value will be zero Allow the applied pressure to stabilise Record the output pressure of the pressure standard and the corresponding instrument reading shown on the display Repeat the application of test pressures for a minimum of six increasing pressures zero 20 40 60 80 and 100 F S recording the corresponding instrument readings for each test pressure Commencing at full scale repeat the application of test pressures in decreasing steps down to zero or ve value if applicable DO NOT VENT TO ATMOSPHERE BETWEEN POINTS Calculate the percentage error of the instrument s pressure reading against the applied test pressures Check that the calculated values are within the accuracy limits stated in Section 1 K163 Issue No 3 5 Calibration 5 7 5 5 Full Scale and Zero Adjustment TEM PRESSURE BEFORE DISCONNECTING OR CONNECT 1 TURN OFF THE SOURCE PRESSURE AND VENT THE SYS ING ANY PRESSURE LINES PROCEED WITH CARE To perform a zero and full scale adjustment proceed as follows O O Isolate and disconnect the pressure supply source Vent the pressure on the system side of the instrument and disconnect the pressure connection to t
50. extremely accurate and repeatable setting of pressure output The Druck pneumatic control actuator achieves this level of control whilst also providing fast response and very low gas supply consumption Only 2U of 19 inch rack is required to house the unit which is controlled remotely by a host computer for fully automatic applications or from one of the range of Remote User Interfaces for manual or semi automatic applications Pressure demands via a digital interface are converted by the controller into a regulated pressure supplied from a line or bottle source Both RS232 and IEEE 488 interfaces are provided as standard The controller module has both control and measure modes Up to three controllers may be stacked and controlled from a single User Interface or computer Two levels of accuracy enhancement are available as Options A1 and A2 Option B provides negative pressure calibration The controller is interchangeable with a DPI 510 at IEEE and RS232 communications level Essentially the DPI 520 is compatible with the Druck control software products InteCal and ACS A remote User Interface RUI 100 and RUI 101 is available giving manual control and display on one two or three DPI 520 in a stacked system In this way control is provided to a high accuracy over a wide pressure range See the RUI 100 101 Product Note for details K163 Issue No 3 1 2 1 1 DPI 520 User Manual Instrument Specification Pressure
51. ginal default values with any new values entered during set up and commissioning CAUTION Once any default value has been overwritten the original value is lost After an overwrite operation the only way of recovering a previous set of defaults is to have recorded them prior to overwriting and then to physically re enter them K163 Issue No 3 EL o 3 30 DPI 520 User Manual When Recall Defaults is initially selected three options are made available as follows e g Recall Defaults Yes Next Quit Select Yes F1 to recall the previous set of stored default values The parameters affected will be controller scale zero set point value ratio preset and rate NOTE This will cause any of the above parameters changed since the last recall defaults operation to be overwritten with the original default value Select Next F2 if any of the current set of default parameters are required to be set as default values in place of the original set i e store current set up Selection of Next provides a prompt to replace store the default values e g Replace defaults Yes Next Quit Select Yes F1 to accept store the current values as defaults Next F2 to move on to the Set up Controller menu options without storing new defaults or Quit F3 to return to the main set up menu NOTE It is recommended that the operation of storing defaults i e current set up be carried out only after installatio
52. hat the instrument be returned to a qualified service agent The use of a dead weight tester having measured masses and correcting for temperature and gravity is considered mandatory for this level of calibration The work should be conducted in a controlled environment with adequate stabilisation time before and during adjustment K163 Issue No 3 5 Calibration 5 3 5 2 1 General Procedures The following general hints are provided as a guide to calibration procedures DO Use high quality Repeatable and Linear pressure sources and allow adequate stabilisation time before calibration minimum 1 hour Conduct the calibration in a temperature and preferably humidity controlled environment Recommended temperature is 24 C 2 C Use dead weight testers carefully and away from draughts DO NOT Conduct non linearity compensation unless a calibration check shows excessive non linearity Conduct temperature compensation unless certain of the reason why the compen sation has changed NOTE Temperature compensation is only available on the high accuracy DPI 520 models options A1 and A2 K163 Issue No 3 E Lo 5 4 5 3 5 3 1 DPI 520 User Manual Using the Calibration Menu The calibration routines are enabled by a switch located on the rear panel of the instrument To select the Calibration mode remove the sticker located on the rear panel of the instrument and set the Cal switch to the 1 position
53. he Comms option F2 from the set up menu provides access to the parameter set up facilities for both the RS232 and IEEE 488 communications interfaces Figure 3 11 summarises the parameters accessed by each menu option Access to the options in each menu are controlled by three function keys labelled F1 F2 and F3 their functions being described in Section 3 9 1 When either an RS232 or IEEE 488 parameter is changed during set up the change is immediately stored Ifthe instrumentis subsequently switched off when it is next powered up the last set of communications parameters entered are recalled regardless of whether the Power up parameter see Section 3 9 2 is set to Reset or Restore IEEE 488 Set up To access the IEEE 488 parameter set up menus select set up enter the PIN if allocated and select Comms F2 from the main menu Selection of Commis provides a choice of either RS232 or IEEE 488 as follows Setup Comms RS232 IEEE Quit Select IEEE 488 F2 and immediately the first of the IEEE 488 parameters will be presented for change e g Device Address 16 Alter Next Quit Use the Alter F1 key to change the address and a prompt for a new value is given e g Enter new value K163 Issue No 3 3 Installation 3 37 Enter the new value via the numeric keypad and press the Enter key Use the Next F2 key to move on to the next terminator or subsequent options and the Quit F3 key to exit the menu
54. he IEEE 488 data bus when particular events occur For example ifa programming error is made or if the pressure controller has reached a stable in limit condition The trigger event is set by the l command 4 7 2 Standard IEEE commands GTL GO TO LOCAL Local control manual default IFC Interface clear Instrument not reset DCL Device clear Reset instrument to default settings as follows Error status 00 Notation code NO Display code DO Interrupt code 10 Error reporting Enabled Wait time W002 4 7 3 IEEE Bus Time out When the instrument receives the command to TALK the transmit data is prepared before exchanging data with the control computer The time out value the time that the control computer waits for the transmitted data is selected and enabled in the control computer program It is recommended that the time out value should be selected to greater than 50 msecto correspond with the beginning of read back character transmission If the TALK command is preceded by other commands then there will be a greater delay before the read back character transmission commences The extra delay is related to the execution of the preceding commands For a multiple command string e g R1S0P200 0W20C1 allow a delay of approximately 1 second before requesting read back data For much longer multiple command strings the delay should be further increased K163 Issue No 3 4 28 DPI 520 User Manual 4 7 4 RS232 Command
55. he cable O Connect the host comms port to the DPI 520 instrument s 9 way D type RS232 port connector as shown in Figure 3 4 O Use the setup comms menu see Section 3 6 3 to set up the required RS232 parameters X X should be set to Disabled RXD TXD GND CTS RTS DTR DSR RSLD COMPUTER PRINTER DPI 520 RS232 Figure 3 4 RS232 9 Way Connections Software Handshaking K163 Issue No 3 3 Installation 3 17 Computer with 25 pin D type Connector For applications where no handshaking is required between the instrument and a host computer or printer thatuses a 25 pin D type port connector proceed as follows O Connect pins 6 8 and 20 together and link pins 4 and 5 at the host connector end of the cable O Connect the host computer communications port to the DPI 520 instrument s 9 way D type RS232 port connector as shown in Figure 3 4 O Use the setup comms menu see Section 3 6 3 to set up the required RS232 parameters X X should be set to Disabled RXD TXD GND CTS RTS DTR DSR RSLD 8 COMPUTER PRINTER DPI 520 RS232 Figure 3 5 RS232 25 way Connections Software Handshaking K163 Issue No 3 IE 3 18 DPI 520 User Manual 3 6 Connection of Remote User Interface Refer to publication K181 for connection details 3 7 Analogue Output Socket Connection to the Analogue Output socket is made via a coaxial BNC connectors T
56. he outlet port Connect the outlet port of a pressure standard to the instruments outlet port Set the Cal switch located on the rear panel to the 1 position Enter the calibration menu as outlined in Section 5 3 and 5 3 2 This will open the isolation valve O Wait one hour to allow the instrument to stabilise O Select 2 point from the calibration menu the following prompts will be displayed e g Zero pressure Enter when stable Set the pressure standard to the required zero pressure allow time for the pressure reading to stabilise Enter the zero pressure reading on the numeric keypad and press use 35 mbar or 1 F S for absolute instruments and ve F S for differential instruments When satisfied that the pressure has stabilised press NOTE If a negative calibrated instrument the pressure standard should be connected to the reference port for the zero reading For highest possible accuracy ensure as wide a span as possible between the zero and F S calibration points K163 Issue No 3 Lo 5 8 5 6 DPI 520 User Manual O After entry of the zero pressure a prompt is given for the full scale pressure e g F S pressure Enter when stable Setthe pressure standard to the required full scale pressure and allow time for the pressure reading to stabilise Enter the full scale pressure reading on the numeric keypad and press When satisfied that the pressure has stabilised press O
57. here EO CR LF E1 CR E2 LF E3 SPACE Rate Rate mode where JO variable rate J1 autorate J2 maxrate Variable rate V variable rate Units U units in text Accuracy standard A1 medium accuracy A2 high accuracy Full scale full scale of instrument in bar The string also include the units and type g gauge a absolute d differential Serial number configured serial number of instrument K163 Issue No 3 4 18 DPI 520 User Manual e Error status Code In the NO N1 and N3 notation code settings any error or status information changes occurring if error reporting is enabled by control code 1 is indicated by the addition of value at the end of the data string Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Command not accepted a command syntax error has occurred Secondary address not available The instrument was addressed with a secondary address that it did not understand Data string not valid The value returned by the instrument is not yet valid This reading should be ignored occurs when changing units and the instrument has not yet performed a new conversion Reading in limits within the 0 05 FS tolerance including wait time Over range reading exceeds transducer range or 99999 End of conversion a new reading is available Valve over temperature one of the valves has overheated and shut down The controller will not operate corr
58. instruction which is allowed to elapse before the zero operation is carried out This period is to allow sufficient time after the opening of the vent valve for the pressure to collapse and reach zero This period will depend on system volumes NOTE In applications where a number of controllers are connected to a common port Manual Zero Isolated must be selected and Timed and Auto zero set to OFF Timed Zero A timed zero is an automatic zero which takes place after a user programmable period of time has elapsed default value 30 min The zeroing sequence is as follows a Isolation valve closes b Instrument vent valve opens c After a user programmable delay period to allow sufficient time to establish zero pressure the zeroing operation is carried out d The controller re establishes output pressure at the level existing immediately prior to the timed zero taking place e The isolation valve is opened to reconnect the controller to the system NOTE The timed zero option should be set to OFF when more than one controller is operating into a common manifold It should also be set to OFF when the AUTO zero mode is enabled K163 Issue No 3 IE 3 48 DPI 520 User Manual Auto Zero When selected the auto zero mode causes the instrument to perform an automatic zero every time an aim of zero pressure is made Set up method Zero O Press set up key and enter PIN if required to display O Menu set u
59. ions are used to select either a two point calibration routine or a or full linearity calibration The high accuracy options of the instrument provide an additional temperature compensation facility TC For the high accuracy options only the following calibration menu will be displayed 2 Point Linearity TC Temperature compensation by the user is NOT recommended hence no tem perature compensation procedures are described in this manual Zero and Full Scale Adjustment 2 Point Cal Selection ofthe 2 Point Cal option of the Cal Menu enters a routine which requires the application of a zero pressure and a full scale pressure Details of full scale and zero adjustment are given in Section 5 5 Non linearity Adjustment Linrty Selection of the Linrty option ofthe Cal Menu enters aroutine which requires the entry of atleast three calibration pressures The method of carrying out non linearity correction is described in Section 5 6 K163 Issue No 3 Lo 5 6 DPI 520 User Manual 5 4 Checking Linearity Calibration SYSTEM PRESSURE BEFORE DISCONNECTING OR TURN OFF THE SOURCE PRESSURE AND VENT THE CONNECTING ANY PRESSURE LINES PROCEED WITH CARE To check an instrument s calibration proceed as follows O O Isolate and disconnect the pressure supply source Vent the pressure on the system side of the instrument and disconnect the pressure connection to the outlet port Connect the outlet port of a pr
60. is measured by a suitably scaled internally mounted pressure transducer Pressure demands to the controller are sent via either the RS232 or IEEE 488 communications interface and decoded by the microprocessor The decoded demand is sent to the setpoint A D converter processed with other loop control terms and applied to an error amplifier The other input to the error amplifier is the transducer output signal representing the actual pressure at the controller output The error amplifier produces a bipolar error signal proportional to the magnitude and direction of the error between the setpoint demand and the actual output of the controller This error is first processed by an error signal processing circuit under the control of the microprocessor to drive a pulse width modulator The output of the pulse width modulator drives the Apply and Release valves to change the output pressure in an appropriate direction to correct the error i e to equalise the setpoint demand and pressure feedback signals A temperature feedback signal from the output manifold modifies the drive to the output valves should they become overheated An analogue signal proportional to the output pressure is derived from the output of the pressure sensing transducer The output of the pressure transducer is scaled by an amplifier buffer and filtered before outputting from the instrument as a d c signal The gain of the output amplifier is set during manufacture to
61. ller controls the output at this level for 60 seconds and then switches off The instrument then waits for 30 seconds and measures over the next 15 seconds to perform a leak test The system is then restored to the last measured value prior to selection of the test The measured leak rate is written to the display in displayed units per minute e g Leak rate 0 0145 bar min K163 Issue No 3 3 Installati on 3 35 F1 MENU QUIT POWER UP PNEUMATIC RESET F2 F1 F1 1 Y F3 RESTORE Y KEYBOARD r 7 UNLOCKED F2 F1 F1 F3 LOCKED Y PEERS F1 H DEFAULTS REPLACED YES F2 F3 Y SET UP CONTROLLER STABILITY A Y F2 F1 Y F1 AUTOSPEED rs Y F1 Y AUTOMAX Y SET PIN 4 F1 H ENTER NEW PIN 1 F3 gt YES F2 Y SHOW S W REVISION F1 j REV DISPLAYED F3 I YES F2 Y ELECTRONIC TEST F3 Figure 3 12 Menu Set up Options K163 Issue No 3 IE 3 36 DPI 520 User Manual 3 9 3 Set up COMMUNICATIONS Selection of t
62. lowest zero pressure allow time for the pressure reading to stabilise Enter the zero pressure reading on the numeric keypad 35 mbar or 1 F S for absolute instruments ve F S for differential instruments and press When satisfied that the pressure has stabilised press NOTE If a negative calibrated instrument the pressure standard should be connected to the reference port for the zero reading O A prompt will now be given for a second point as follows e g Another point Yes No Abort O Select Yes and enter the next and subsequent test pressures as detailed above A minimum of three points must be entered for all types of instrument Standard instruments will accept a maximum of 5 points true differential and Option B negative Cal gauge instruments a maximum of 10 points High accuracy option instruments options A1 and A2 accept a maximum a maxi mum of 24 points Recommended test pressures for the instruments are as follows All figures quoted as a percentage of full scale reading Standard 0 50 100 Option A1 0 14 28 56 100 Option A1 Neg Cal 0 14 28 56 100 Option A2 0 9 18 27 42 58 77 100 Option A2 Neg Cal 0 9 18 27 42 58 77 100 Option B Neg Cal 0 14 28 56 100 O After application of the last required pressure select No from the Another point prompt Ifthe last point available has been used the linearity calibration routine termina
63. mmunication parameters as described in the Setup Menu refer to Section 3 9 3 K163 Issue No 3 IE 3 8 DPI 520 User Manual 3 4 2 Multiple Unit Installation In order to extend the IEEE 488 bus to a number of different units stacking plugs are used to link down from one instrument to the next Proceed as follows O Plug a pair of IEEE 488 stacking connectors as shown below into the IEEE 488 socket located on the rear panel of the instrument DPI 520 IEEE 488 socket IEEE 488 to host IEEE 488 to other instruments O Connectthe other end of one ofthe connectors into the IEEE 488 socket on the host system and the free connector into the next unit in line O Continue to loop down stacking two plugs into each unit until the required number of units have been connected to the bus CAUTION Whilst with the use of stacking plugs it is if required possible to stack more than two plugs into a single socket care should be taken to ensure that undue strain is not placed on an instrument socket by stacking in too many plugs O Use the Setup Comms menu on each instrument to set up the required communication parameters Refer to Section 3 9 3 K163 Issue No 3 3 Installation 3 9 3 5 3 5 1 RS232 Interface General The RS232 communications system enables a control computer host or a Remote User Interface RUI to control a single instrument or number of intercon nected instruments by sending and
64. n RS232 command questions the address of instruments on the daisy chain The instruments respond by transmitting their addresses e g if address 15 and 16 are on the bus then the reply from this command would be ADD15 ADD16 K163 Issue No 3 4 Operating Instructions 4 23 O Addressed Commands The following commands will be acted on only when the instrument is a LISTENER DCL Device Clear establishes a default condition as follows 00 Error status cleared NO Notation code DO Display code 10 Interrupt code 1 Error reporting enabled W002 Wait time DIA Dialogue establishes dialogue output format even if instrument has been set up in non dialogue format DPI Instrument identity identifies the instrument on the ring and returns the same data as the N5 command O Command Blocking All commands are echoed round the ring However if acommand is preceded with the 96 character the command will be blocked if the instrument is set to end device Example R1 CR It is possible to establish any instrument as the End Device on the Daisy chain by the SET UP procedure In this mode of operation the instrument will a NOT allow command packets to pass through i e packets of the form lt CR gt b NOT allow blocked packets to pass through i e packets of the form lt CR gt c NOT allow flow control characters X X to pass through orr
65. n of the instrument has been completed and the system tested Do NOT power off before storing a set up or all current values excluding COMMS set up will be lost e Set up Controller Changes to the controller set up allow adjustment of the control loop stability auto speed and auto max parameters Stability may require adjustment depending on the system volume being controlled and auto speed and auto max depending on the required step response The option to change the controller parameters is given by the following prompt Set up Controller Yes Next Quit Select Yes F1 to change the controller parameters which are then presented in the following order K163 Issue No 3 3 Installation 3 31 O Stability The controller stability factor may require adjustment when the system volume is changed The stability setting is typically between 25 and 200 Following installation to check the controller stability value for a given system volume proceed as follows i Record the stability setting of the controller by entering the set up controller menu and reading the stability value Quit the set up mode ii Program a set point of zero and the controller to ON iii Program a set point of 80 F S If the controller oscillates on reaching the demanded pressure the stability setting is too low If on reaching the set point low frequency drift about the set point is occurring the stability setting is too high iv Sel
66. nd if required NAMAS accredited calibration service Calibration Check At the chosen interval the instrument readings should be compared with a known standard Any deviations between the instrument and the standard should be noted taking due account of the traceability accuracy to a National Standard If these deviations exceed the published tolerance or any other suitable chosen performance standard then the user may wish to carry out a calibration adjust ment The following sections in this chapter explain the method of calibration adjustment The recommended procedure is to check at increasing and then decreasing intervals of 0 20 40 60 80 and 100 of full scale K163 Issue No 3 E Lo 5 2 5 2 DPI 520 User Manual Calibration Adjustment Before carrying out any calibration adjustments the results of the calibration check should be studied to determine the nature of the deviations to be adjusted If only offset zero and gain full scale are exhibited and the recorded measurements are otherwise essentially linear then only a ZERO and FULL SCALE adjustment is required If there is non linearity with or without offset and gain errors then non linearity compensation adjustment is necessary Temperature performance drift is most unlikely In the unlikely event that this type of error is found itis most probably an indication of a damaged or failing transducer Under these circumstances it is recommended t
67. nection to Druck rack mounting Remote User Interface Daisy chained to RS232 port Supplies 24V D C supply for Remote User Interface JEEE488 ua uama Standard GPIB socket AG POW6F ibant IEC 320 connector Line L and Neutral N individually fused within socket K163 Issue No 3 1 4 DPI 520 User Manual Electrical Controls Stacking Switch Controls use of RS232 interface Calibratioti inire tene Switch located under calibration label used only during instrument calibration Input Output Connections Front Panel Electrical Connections User Interface R92392 iicet neret tete b tenes 6 way Lemo socket for connection to Druck Desktop Remote User Interface Type RUI 100 Daisy chained to RS232 port with automatic bypass when not in use Supplies 24V d c for the user interface Environmental Specification Temperature lecum EE 0 to 40 C Operating compensated 444 10 to 30 C SI0 AGC is M 20 to 60 C Protection gie m EN to IP40 EMC MEGIS aru ten EN 50081 1 emissions ETUR UL I EN 50082 1 immunity Safety MEGIS EN 61010 1 Pressure Media clean dry gas Weight D cL I IA M CU LII 5 2 kg Dimensions nee ba mete benne 90 mm high 482 mm wide and 360 mm deep Indicates case depth Add 40 mm for the depth of handles K163 Issue No 3
68. nete eniin qaa 4 11 4 4 14 RATS agan 4 11 4 4 15 Zero Instrument 01 4 11 4 4 16 Rate 7 10 HH HM 4 11 4 4 17 Isolation Valve Open Close E lll u a aaa aasawa Hem 4 11 4 4 18 Open Isolation valve lt F uc nien niece ee aces 4 12 4 4 19 Tare value B iii 4 12 4 4 20 Muriel 4 12 4 5 Output Code Format Q eere cedes cete Sek esters Me eR grece 4 13 Parameter DefinitlOris rrr reci reete rr et Yee vaca 4 14 Error StattuS G0d6 risiede rita elg a rano E ara Ye FRA s o Fra eo PRA LER REFER REE 4 18 4 6 139232 SPECI C c nn an esse ues hee cere rer ei ecce errr 4 19 4 6 1 Operation Using R5232 u rene tede metier 4 19 Directo deeri ieee renr ee i deer ec YER Spa ERE E PAR cease 4 20 Printer Mode a nnne ener a 4 21 Addressed Mode ssssssseee eene 4 21 4 6 2 RS232 Output Code Format 4 24 4 7 Operation Using IEEE 488 5 iin ee ecd crece 4 26 4 7 1 Senak POM haz un EE 4 27 4 7 2 Standard IEEE Commands 4 27 4 7 3 IEEE Bus Time OUES see u u lu 2 oed RO ws e a ga usan 4 27 4 7 4 RS232 Command Specific Commands 4 28 4 7 5 DPI 500 MOGd6G 3 nire tertie ee ehe usanta hka Sede eee 4 28 4 7 6 ASCII Valu6S uuu eee seas sche teretes toti eire Er Eei 4 29 Continued K163 Issue No 3 Contents vii Section Page 5 CALIBRATION
69. ns 4 13 4 5 Output Code Format The data sent consists of a data string of ASCII characters followed by the terminating characters programmed from the front panel The general format is lt DATA gt lt TERMINATOR gt Where lt DATA gt depends on Notation code secondary address TERMINATOR is one of the following set from the front panel SET UP lt CRLF gt lt CR gt lt LF gt lt SPACE gt Error conditions are indicated by Value The complete parameter is omitted in the absence of error or error reporting if disabled control code 0 The format is dependant on the preceding notation code NOTE The numbers in brackets are the number of characters per item Notation Codes Notation Code N0 Format lt value gt lt mode 3 gt lt range 2 gt lt scale 2 gt lt value source 2 gt lt error status code 3 gt lt terminator gt Example 0 0007REMR1S2D1 01 If no errors occur or error reporting is disabled then the error status code is omitted K163 Issue No 3 4 14 DPI 520 User Manual Notation Code N1 Format lt value 7 gt lt error status code 3 gt lt terminator gt Example 0 0007 01 If no errors occur or error reporting is disabled then the error status code is omitted Notation Code N2 Format lt mode 3 gt lt range 2 gt lt scale 2 gt lt value source 2 gt lt controller status 2 gt lt interrupt code 2 gt lt isolation valve stat
70. o connect to the sockets connect a lead fitted with a BNC plug to the socket and turn clockwise to lock the bayonet into place The pin out the socket is shown in Fig 3 8 Centre ve Shell ve Cable Screen GAIN Qe C ANALOGUE OUTPUT Fig 3 8 Analogue Output Socket Connections K163 Issue No 3 3 Installation 3 19 3 8 3 8 1 3 8 2 Pressure Connections Pressure Safety Instructions ALWAYS CHECK FOR TRAPPED PRESSURE BEFORE CONNECTION OR DISCONNECTION OF PRESSURE COUPLINGS ENSURE THAT CORRECTLY RATED PIPES AND FITTINGS ARE USED OBSERVE MAXIMUM WORKING PRESSURE OF THE INSTRUMENT gt gt gt Connection Fig 3 9 and 3 10 To connect up to a pneumatic port proceed as follows Make sure that there is enough length of cable and pipe for the installation and removal of the instrument Figure 3 9 shows the method of fitting The instrument may need to be removed regularly from the rack for calibration Alternatively a pressure standard can be connected to the instrument when fitted in the rack Source Pressure Port SOURCE PRESSURE CAN LEAK TO THE OUTLET PORT UNDER FAULT CONDITIONS EVEN WITH ELECTRICAL POWER REMOVED MAKE SURE THAT THE USER SYSTEMS CAN BE ISOLATED AND VENTED For a given instrument the Source pressure must be in the specified source pressure range see Section 1 1 When connecting a number of instruments of differing ranges to a
71. o set up the Max parameter Press Quit F3 to exit mode K163 Issue No 3 Il o 3 52 DPI 520 User Manual O Ratio After selection of Ratio option F2 from the set point menu the current value for Ratio 0 will be displayed together with the change menu The default value for this parameter is zero e g Ratio 0 0 0000 Alter Next Quit Select Alter F1 to change this value and in response to the prompt Enter New Ratio 0 enter the required value on the numeric keypad and press Enter lt Select Next F2 from menu to move on to set up the next parameter Ratio 961 and subsequent ratio parameters Ratio 2 to Ratio 11 a similar way When all changes have been made press Quit F3 to exit mode O Preset After selection of Preset option F3 from the set point menu the current valueforPreset 0 will be displayed together with the change menu The default value for this parameter is zero e g Preset 0 0 0000 Alter Next Quit Select Alter F1 to change this value andin response to the prompt Enter New Preset 0 enter the required value on the numeric keypad and press Enter c Select Next F2 from menu to move on to set up the next parameter Preset 961 and subsequentratio parameters Preset 2 to Preset 11 a similar way When all changes have been made press Quit F3 to exit mode K163 Issue No 3 3 Installation 3 53 Set up Method Rate SET UP O Menu O Comms e M
72. on forces the instrument to carry out a self test operation on it s RAM EPPROM and EEPROM checking checksum values against known values On entering this menu option the following screen is presented Self Test Electronic Yes Next Quit Selecting Yes F1 starts the test The result can either be a pass or reported fail condition e g Self test passed Or error conditions Eprom failure Ram failure Cal Checksum Error The first two error conditions indicate an error requiring service attention Refer to Section 5 for details of calibration The electrical self test facility is automatically started at power up During normal operation should any of these faults occur the error condition will be written to the display A pass is not reported at power up K163 Issue No 3 o 3 34 DPI 520 User Manual e Self Test Pneumatic This instrument leak test should only be carried out when the controller has been fully installed The following system conditions should therefore exist i Source pressure connected and turned on ii External system connected iii Vacuum supply to vent port if used turned on iv The instrument is thermally stable On entering this menu option the following screen is presented Self Test Pneumatic Yes Next Quit Selecting Yes F1 starts the test During the test the isolation valve closes and the controller goes to 2 5 bar or F S whichever is lower The contro
73. or correct operation at zero gauge atmospheric pressure However zero will be achieved without this pressure providing the following are considered O Controlling under these circumstances may result in increased acoustic noise from the instrument O Associated with the increased noise is increased wear on the valve O Ifthe condition is maintained the controller may switch itself off automatically to protect the valves against overheating These limitations may be minimised by O Monitoring the pressure reading and turning off the controller when zero has been reached or as soon as practical thereafter Continuing to monitor the pressure and turning the controller on again should the pressure increase as may be caused by temperature rise in the system This is particularly effective when the instrument is computer controlled O Minimising the system volume and or using external apply and release valves so as to reduce the time to reach zero pressure K163 Issue No 3 o 3 26 3 9 3 9 1 DPI 520 User Manual Set up Mode General Set up mode is used to set up the instrument s default control parameters to those required for the particular mode of operation When the instrument is delivered a number of default parameters are set some of which may need to be changed for specific applications Set up uses the keypad on the front panel of the instrument to program these operating parameters Access to the set up mode
74. ore a Scale a Zero m More A Set point A Rate A Quit Alter Next Quit T Value T Auto T Max Press set up key and enter PIN if required to display set up menu Select More F3 and select More F1 from more menu Select Rate F2 from menu displayed A prompt will now be displayed showing the status of the F1 function together with a change menu e g F1 Max Alter Next Quit Select Alter F1 to change this value and a further menu is presented as follows e g Select F1 Mode Value Auto Max Select either Auto F2 or Max F3 to assign either of these functions to F1 or to assign a value to F1 select the value key This starts a further dialogue as follows e g Note the reported units will be those currently selected Enter rate bar sec m Select Rate F2 from menu displayed A prompt will now be displayed showing the status of the F1 function together with a change menu m Enter the required value on the numeric keypad and press Enter c m Press Quit F3 key if displayed or DEL to quit rate set up mode K163 Issue No 3 3 3 54 DPI 520 User Manual K163 Issue No 3 4 Operating Instructions 4 1 4 4 1 4 2 4 3 OPERATION This instrument is normally operated in remote mode using IEEE or RS232 Local mode is used for instrument set up and calibration purposes only No operational commands e g set point or tare values can be entered via
75. ort if appropriate Received Command N4 Output is ERROR REPORTING ON OFF MAX RATE AUTO RATE VAR RATE ON RATE lt Value 7 gt lt Units 6 gt s UNITS Text for units used Received Command N5 Format DPI520 lt accuracy 3 gt lt fullscale 12 gt lt serial number 7 gt lt terminator gt Example DPI520 A1 70 0000 barg 2222 Received Command N7 The status condition of the instrument is returned as lt mode 3 gt lt range 2 gt lt scale 2 gt lt value source 2 gt lt controller status 2 gt lt interrupt code 2 gt lt notation code 2 gt lt wait time 4 gt lt terminator gt Example REMR1S3D1COION4W002 K163 Issue No 3 4 26 4 7 DPI 520 User Manual Received Command N8 The full status condition of the instrument is returned as lt mode 3 gt lt range 2 gt lt scale 2 gt lt value source 2 gt lt controller status 2 gt lt interrupt code 2 gt lt notation code 2 gt lt wait time 4 gt lt error status 2 gt lt terminator code 2 gt lt rate 2 gt lt variable rate 8 gt lt units 7 gt lt tare 2 lt tare value 8 gt lt terminator gt Example REMR1S3D1COION4W00201E1J0V 000001 U PaT1B 000010 Interrupt Data Interrupt data is generated spontaneously by the instrument when preset conditions have been achieved The source of interrupt is configured by the l command lt address gt lt CR gt where lt address gt is the address of
76. ot be used in printer mode OR b Dialogue Format All data is returned in plain English text K163 Issue No 3 4 20 DPI 520 User Manual 2 Determine the Handshaking Method required a Software Handshaking RTS and CTS are not connected which reduces the number of connections between instruments Referto Section 3 for installation details OR b Hardware Handshaking This system uses the RTS and CTS signals from the instruments to control data flow Direct Mode Inthe direct mode all control codes are acted upon as soon as they are interpreted In addition sending CR will return a reading The format of the returned data depends on the D and N command K163 Issue No 3 4 Operating Instructions 4 21 Printer Mode The printer mode allows for the automatic and continuous output of data to a non programmable device such as a printer In the printer mode the output interval is programmed by the main instrument SET UP menu as printer N value A value of 1 programs the output of data on every new reading a range of 1 to 9999is available A reading number is sent with each output of data The output of data takes the following format lt Reading number gt PRESSURE lt Value gt lt Units gt SET POINT lt Value gt lt Units gt where lt Reading number gt is in the range 1 9999999 Addressed Mode Addressed Mode Control Codes In the addressed mode all codes are available In
77. p menu O Comms More PEE O Select More F3 and select Zero F2 from More menu m Zero n More O To set up the manual zero options select Manual F1 Manual from Zero menu A Timed ete O Use the Alter F1 key to toggle through options available Alter Enabled Isolated or Disabled until the required Quit mode parameter is displayed O Press Quit F3 key to quitto set up menu or Next F2 to set up the required Wait time The following prompt will now be displayed Enter new wait secs Enter the required wait time on the numeric keypad and press the Enter key O To set up the timed zero options select Timed F2 from the zero menu options O Use the Alter F1 key to toggle through the available options Off or On until the required parameter is displayed O Press the Quit F3 key to quit to set up menu or Next F2 to set up the required zero period The following prompt will now be displayed e g Enter new time minutes 30 K163 Issue No 3 3 Installation 3 49 3 9 5 Enter the required zero period on the numeric keypad and press the Enter key A prompt for the entry of a wait period will now be given e g Enter new wait secs 30 Enter the required Wait time on the numeric keypad and press the Enter lt key O Tosetup the auto zero options select Auto F3 from the zero menu options O Use the Alter F1 key to toggle through the available options Off o
78. provide one of four scaled ranges refer to Section 1 Specification K163 Issue No 3 DPI 520 User Manual 2 4 1 NOLLV IOSI A AISWASSY SILVWNANd 1 3svas gt TWNOIS H9V90334 FNNLWYAdWSL HOSSdOoOHd WO TOULNOD YOLVINGOW HLOIM asind HOSSdOoOHd 13Idl 1dIAV HOHNH3 lt HOSS390 d ALNIOdLAS GNVW3Q ANIOd LAS yOu Ze i V H q gt Niv SUaAING Doe Aw gt l 3owunos Ai HIONOSNVEL 1ndino 4OSS190 d aunssaud 3060 NV w a 14314308 w ge Sean Sama aa ss M aa 447 ualdndwv 1ndino Hossdooud WO ANIOdLAS HOSSdOoOHd OL Andino Figure 2 2 Analogue Electronics Functional Diagram K163 Issue No 3 3 Installation 3 1 3 INSTALLATION 3 1 Safety Instruction IT IS ESSENTIAL THAT THE INSTALLATION OF A ELECTRICAL AND PNEUMATIC SUPPLIES BE UNDERTAKEN BY A COMPETENT PERSON INSTALLATION REQUIREMENTS 1 THE INSTRUMENT IS DESIGNED TO BE RACK MOUNTED IN A STANDARD 19 RACK OR SUB RACK AND OCCUPIES 2U OF SPACE 2 PROVISION MUST BE MADE FOR A FLOW OF AIR THROUGH THE VENTILATION SLOTS ABOVE AND BELOW THE INSTRUMENT 3 1 1 Input Output Connections Fig 3 1 and 3 2 All connections to the instrument with the exception of an alternative Remote User Interface connection located on the front panel are made to the rea
79. r On until the required parameter is displayed O Press the Quit F3 key to quit to set up menu or Next F2 to set up the required wait period The following prompt will now be displayed e g Enter new wait secs 30 Enter the required wait period on the numeric keypad and press the Enter key More Set point and Rate The More F3 option of the set up more menu provides access to the set point and rate setup menus as shown in Figure 3 12 A brief summary of these functions follows Set point The set point set up facility provides access to three set point modes value ratio and preset O Value The value option of the set point menu sets the value of the minimum and maximum set point limits that can be demanded by the P command The default values are zero and 1 1 times the full scale pressure of the instrument Any values within this range can be programmed under set up NOTE The figures entered are in the selected pressure units e g for a 2 bar instrument the factory programmed default would be 0 bar minimum and 2 2 bar maximum K163 Issue No 3 Il o 3 50 DPI 520 User Manual O Ratio Selecting the Ratio mode from the set point option provides a sub menu of twelve ratios figures represent a percentage of current set point The factory default values for these ratios provide 10 steps from zero to 110 of current scale reading Set up provides the facility to set each of these ratios
80. r panel of the instrument Fig 3 1 shows a diagram of a typical rear panel layout together with the electrical and pressure connections 3 1 2 Rack mounting To install the instrument in a standard 19 rack proceed as follows O Iftheinstrumenthas been previously installed isolate and disconnect N all power supplies O Isolate all pressure supplies and disconnect all pressure inlet and outlet connections O Remove any electrical connectors connected to the instrument e g RS232 and IEEE 488 connectors O Before installing make sure that there is enough length of cable and pipe for the installation and removal of the instrument O Connections are made at the rear of the instrument allow enough space for the cables and the pipes when the instrument is pushed back and secured in the rack Itis important to allow cooling air to flow through the instrument K163 Issue No 3 o 3 2 DPI 520 User Manual Key to figures 3 1 and 3 2 1 IEC connector 2 IEC power supply socket assembly 3 fuse holder 4 fuse 5 small bore connector G1 8 6 large bore connector G1 8 7 reference connector M5 8 analogue output connector 9 user interface connector rear panel 10 RS232 interface connector 11 IEEE 488 interface connector 12 user interface connector front panel Figure 3 1 DPI 520
81. rameters adjusting the stability value as detailed in Section 3 9 2 K163 Issue No 3 6 Maintenance 6 6 Approved Service Agents 6 7 The following are approved agents for Druck Instruments FRANCE Druck S A 19 Rue Maurice Pellerin 92600 Asni res France Tel 331 47 93 00 48 Fax 331 41 32 34 64 GERMANY Druck Messtechnik GmbH Lessingstrasse 12 61231 Bad Nauheim Germany Tel 06032 35028 29 20 Fax 06032 71123 HOLLAND Druck Nederland B V Postbus 232 Zuideinde 37 2991 LJ Barendrecht The Nederlands Tel 01806 11555 Fax 01806 18131 ITALY Druck Italia Srl Via Capecelatro 11 20148 Milano Italy Tel 02 48707166 Fax 02 48705568 JAPAN UK USA Druck Japan KK Medie Corp Building 8 2 4 14 Kichijyoji Honcho Musashino Tokyo 180 Japan Tel 81 422 20 7123 Fax 81 422 20 7155 Druck Limited Fir Tree Lane Groby Leicester LEG OFH England Tel 0116 231 7100 Fax 0116 231 7103 Druck Incorporated 4 Dunham Drive New Fairfield Connecticut 06812 U S A Tel 203 746 0400 Fax 203 746 2494 K163 Issue No 3 6 pex S DPI 520 User Manual K163 Issue No 3
82. receiving data over a serial interface There are three RS232 connectors located on each instrument two on the rear panel and one on the front panel Effectively all three connectors access only a single RS232 port on the instrument Refer to Section 2 2 1 Two 9 pin D type connectors are located on the rear panel and a third a 6 pin Lemo connector is located on the front panel One of the rear panel connectors and the front panel connector are dedicated to the connection ofa Druck Remote User Interface RUI 101 rear RUI 100 front The remaining 9 pin D type connector is for connection of a host computer and the daisy chain system In addition to carrying the standard RS232 signals the two RUI connectors supply power 24V d c to the Remote User Interface Table 3 1 shows the signal allocations to each connector and the cross relationship to the standard RS232 system The instrument is configured as Data Control Equipment DCE K163 Issue No 3 3 3 10 DPI 520 User Manual Connector Type Connector Type Instrument Signal RS232 Function Direction Terminology ase fos fos fio oo fs po RTS om ER gt ee fs us RLSD g DCD internall Pulled lt DCR internall Equipment Connector Connector Cable 1 Chassis Shell Shell gt Screen Note 1 Pin 9 used for RxD in daisy chain network applications only Table 3 1 RS232 Connections Section 3 5 2 details the method of connecting the RS232 interface
83. rn to the Setup Menu Reset Ensures that the instrument powers up in a known safe reset state as follows Scale 1 Controller Off Set point Zero Rate 1 Restore When selected causes the instrument to power up recalling the operating conditions which were stored at the last Store Defaults operation See Recall Defaults This selection recalls the operating conditions of the set point controller tare zero value ratio preset and rate parameters K163 Issue No 3 3 Installation 3 29 e Keyboard Unlocked The keyboard parameter can have one of two states Locked or Unlocked When selected the current status is indicated and a prompt to change is given e g Keyboard Unlocked Alter Next Quit Alter F1 toggles the keyboard status between the available options Unlocked and Locked Using Alter F1 select the required status and either press Next F2 to move on to the next function or Quit F3 to return to the setup menu The keyboard lock parameter should not require changing since the PIN effectively prevents any unauthorised access to the setup parameters e Recall Defaults Initially when the instrumentis delivered a full range of factory set defaults will have been entered for the instrument During the course of installation these defaults will probably be changed The Recall Defaults option provides a facility to either recall the original set of default values or to overwrite the ori
84. s causes the instrument to always send the checksum However on reception the checksum is only checked if appended to the command If the checksum is incorrect then the command is not executed and a checksum error is generated Always This is the most secure method the instrument always generates a checksum and always expects to see a checksum appended to the command If the checksum is incorrect or the checksum is missing then the command is not executed and a checksum error is generated Checksum Errors Checksum errors are generated by setting the 1st and 8th bit of the status byte programming error and checksum bit NOTE In DPI 520 mode all the status bits can be displayed since the status is displayed as a 2 digit hexadecimal number In DPI 500 and 510 mode only the first six status bits are displayed 2 digit octal K163 Issue No 3 4 Operatin Instructions Mode Select Local Control Remote Local Local Control Remote Local Remote Control Scale Units on F1 Remote Local Units on F2 Units on F3 3 Units U1 to U24 Data Select DO Remote Local Remote Local Remote Local Units as defined by U command Remote Local S3 Units selection Remote Local Selects data source for NO N1 Remote Local D1 Selects data source for NO N1 Remote Local D2 Selects data source for NO N1 Notation NO N1 Selec
85. sent via one of the two communications interfaces Control of the Analogue to Digital A D Converters used in the analogue and valve control circuits is effected via the microprocessor system s bi directional control bus A simplified description of the analogue control channel follows IEEE 488 HOST gt INTERFACE DISPLAY IEEE 488 BUS HOST gt RS 232 INPUT KEYBOARD MICRO CONTROLLER SYSTEM USER SWITCHING RU 101 gt INIREAR NETWORK BI DIRECTIONAL CONTROL BUS TO ANALOGUE CIRCUITS USER RU 100 9 9 INTERFACE FRONT POWER POWER TO A C POWER Py SUPPLY _ gt ANALOGUE amp DIGITAL UNIT CIRCUITS Figure 2 1 Digital Electronics Functional diagram K163 Issue No 3 2 Functional Description 2 3 2 2 2 Analogue Circuit Operation Fig 2 2 Output pressure control is effected by means two solenoid operated valves One of these valves the Apply valve controls the application of a source pressure to the output manifold The other valve the Release valve releases the output pressure The output pressure is controlled by modulating the drive to each of these valves controlling their relative on off times An Isolation valve also controlled by the microprocessor is used to isolate the controller from the external pneumatic system The controller output pressure external system pressure when the isolation valve is open
86. set up of further controller parameters and move on to the Set PIN function O Automax 1 Auto max sets the maximum step as a percentage of full scale that can be applied from any setpoint Auto max can be programmed between 0 1 slow and a maximum of 1 fast The upper setting 1 corresponds toa step of 100 F S Press the Alter F1 key and in response to the Enter New Automax prompt enter the required factor on the numeric keypad and press the Enter key Select Next F2 to recycle through the controller parameters set or Quit F3 to move on to the Set PIN function e Set PIN A personal identification number PIN should be set to protect the instrument set up parameters from unauthorised change As delivered the instrument has no PIN set On entering the Set PIN menu option the following prompt is given e g Set PIN Yes Next Quit To set a PIN select Yes F1 and in response to the Enter New Pin enter a four digit number via the keypad The number entered is written to the display Check that the number on the display is the one required and press Enter The menu set up then moves on to the next option Show S W Revision To remove the PIN protection enter a PIN of 0000 K163 Issue No 3 3 Installation 3 33 e Show S W Rev This option causes the software part number and revision to be written to the display e g DK144 3 00 Next Quit e Self Test Electronic This set up opti
87. tes automatically NOTE Followdisplay prompts to exit calibration mode or the error message EEPROM Failure will be displayed K163 Issue No 3 Lo 5 10 DPI 520 User Manual O After application of the last required pressure select No from the Another point prompt Ifthe last point available has been used the linearity calibration routine terminates automatically NOTE Followdisplay prompts to exit calibration mode or the error message EEPROM Failure will be displayed K163 Issue No 3 6 Maintenance 6 1 6 1 MAINTENANCE There are no user serviceable parts on the DPI 520 instrument other than the Source Vent and Output manifold filters and the a c power supply fuses Safety Instructions O O Observe the general safety procedures detailed at the beginning of this User Manual This instrument must only be serviced by a Druck approved service organisa tion or by a competent person Section 6 4 details a list of Druck subsidiaries worldwide Continuing Electrical Safety Assessment Electricity at Work Regulations A periodical inspection of the instrument to determine the continuing electrical safety may be carried out at the user s discretion If the user decides that practical testing is required to determine the continuing electrical safety then testing to prove the Earth Continuity limited to 25 Amp test current for 5 seconds and Insulation Resistance 500V may be carried out
88. the a c power source O Check that the display is on O Iftheinstrument display does notcome on isolate the external power supply and remove the IEC connector 1 from the power supply socket assembly 2 O Remove the fuse carrier 3 as shown in Fig 3 2 insert one or two new fuses 4 as required and refit the fuse carrier Fuses are Type T2A rated at 250V 2 Amps O Reconnect the IEC connector 1 and switch on the power supply and the instrument The display should now come on O Switch off the power supply to the instrument Communications Interface Connections Fig 3 1 and Both the RS232 and IEEE 488 interfaces through one or other of which the instrument is controlled are connected by polarised connector plugs 10 and 11 To connect up the interfaces fit the appropriate connectors into the relevant sockets and tighten up the securing screws The following sections describe the connection to an external controller and the interconnection of the communica tions channel between a number of instruments IEEE 488 Interface Fig 3 3 The IEEE 488 General Purpose Interface Bus GPIB is a parallel interface used to connect a host computer controller to one or more DPI 520 instruments and possibly other instruments A typical system is shown in Figure 3 3 To connect a number of instruments together the IEEE 488 bus is connected in parallel to all devices on the bus The bus lines basically divide into three groups Tr
89. the instrument Example 16 interrupt packet from instrument with address 16 When the control computer receives an interrupt packet it should interrogate the instrument to find out the cause of the interrupt Operation Using IEEE 488 The IEEE 488 portallows up to 15 instruments to be controlled by a single computer over an IEEE 488 bus Each instrument has a user configurable address Commands are addressed over the bus The instrument can transmit data requested to TALK or receive data requested to LISTEN When the IEEE 488 bus is connected the current instrument pressure reading or status information is obtained by addressing the instrument to TALK The information sent back will depend on the last notation code sent to the instrument NO is the power up default The instrument will exit local control and enter remote control after receiving the control code R1 The instrument will return to local control after receiving the control code RO or M The IEEE 488 bus command GTL will also return the instrument to local mode K163 Issue No 3 4 Operating Instructions 4 27 4 7 1 Serial Poll The DPI 520 instrument will TALK in response to standard serial poll techniques A single byte is sent whenever the instrument is programmed to TALK and the serial poll enable has been sent over the IEEE bus The serial poll disable command discontinues the mode The instrument activates the SRQ service request line oft
90. the keyboard Control can only be effected in remote mode either via the IEEE 488 or the RS232 serial interface ports Both ports share a common communication language based on the ASCII charac ter set However due to the physical differences between the two interfaces there are additions tothe RS232 command setfor emulatingthe hardware features of the IEEE interface Local Mode This mode is entered as soon as the instrument is switched on and before any control codes have been issued If the instrument is currently operating in the remote mode to return the instrument to Local mode either a R0 or M command must be issued over the communications interface The set up and calibration facilities which use the local control mode are fully described in Section 3 9 and Section 5 respectively InLocalmode theinstrumentkeyboardis enabled Some RS232 IEEE commands are operational in Local mode essentially those which only request data and thus do not affect operation Remote Mode In this mode the front panel keypad is locked out and the full command set is available over the control interfaces Control Codes Control codes sent to the instrument cause it to respond in accordance with the command sent Control codes are sent to the instrument over the RS232 and IEEE 488 communications interfaces The control codes consist of shared codes which are common to both RS232 and IEEE 488 and other codes which are either RS232 or IEEE 488 spe
91. the scale zero set point and rate features of the instrument as shown in Figure 3 12 A brief summary of each of these functions is shown below The set up method for each parameter follows the summary Scale Scale permits three units out of a maximum of 24 to be set up for selection Under set up each of the three function keys F1 F2 and F3 can be programmed with one of the available units The control commands SO through S2 will call the units programmed to these keys as follows SO calls Units allocated to F1 1 calls Units allocated to F2 S2 calls Units allocated to F2 Alternatively the S3 command followed by a U command and suitable argument allows full remote selection of any of the pressure scales Table 3 2 gives the full range of the available units and the corresponding U command argument required to select these units remotely Set up Method Scale O Press set up key and enter PIN if required to display O Menu set up menu O Comms O More O Select More F3 and select Scale F1 from the TOE More menu a More A Alter O Select F1 F1 from scale menu A Next s O Use the Alter F1 key to step through options available until the required units parameter is displayed against the F1 function key Table 3 2 shows all available options O Press Quit F3 key to quit to set up menu or Next F2 to move onto set up the next function key O Repeat for all function keys as required
92. ties to be set up for selection Each of the three function keys F1 F2 and F3 can be programmed with one of three options Max Auto or a Variable value rate The control commands J0 through J2 will call the units programmed to these keys as follows J0 calls F1 default Max J1 calls F2 default Auto J2 calls F3 default 10 F S Units sec Maximum implies a rate within the Min Max set point settings Auto provides a critically damped rate governed by the settings of the Autospeed and Automax parameters refer to controller set up Section 3 9 2 Set up method set point O Press Set up key and enter PIN if required to display set aie LUN O Select More F3 and select More F1 from more menu O More mme O Select set point F1 from menu displayed A prompt will 2 now be displayed requesting selection of one of three m More modes Value Ratio and Preset e g A Rate Select Mode A Quit Value Ratio Preset Value E O Select the required mode by pressing the appropriate function key Each option is described in turn below O Value m After selection of Value option F1 the current minimum value will be displayed together with the change menu The default value is zero e g Min 0 0000 Alter Next Quit m Select Alter F1 to change minimum value and in response to the prompt Enter new min enterthe required value on the numeric keypad and press Enter m Select Next F2 from menu to move on t
93. to the rack O Switch on power supply and pressure source and test installation Cleaning Clean the front panel with a damp cloth and mild detergent DO NOT USE SOLVENTS FOR CLEANING PURPOSES Fault Finding In the event of an instrument malfunction it can be returned to the Druck Service Departmentor Druck Agent forrepair A service charge price listis available which details the charges associated with various service functions K163 Issue No 3 6 Maintenance 6 5 1 Error Codes 6 5 When the instrument detects an error a code number is displayed the error and possible remedy for each code are listed in Table 6 1 Err001 Over pressure Reduce source pressure Err002 Lock mode on Remove lock Sect 3 9 2 Err003 Pressure too high for range Reduce source pressure Vent system pressure Err004 Set point out of limits Refer to set point Sect 4 5 9 Err005 Manual zero is disabled Refer to Section 3 9 4 Err006 Zero reading in progress Wait for zeroing process to end Err007 Zero error too large Zero offset gt 5 of limit Ensure system is venting correctly Err008 Illegal PIN entry Incorrect PIN entered Err009 Access denied Three consecutive incorrect PIN entries made Err010 Wait zeroing Zero in progress Set point rate and controller commands ignored until zero
94. ts output data format Remote Local Remote Local Selects output data format Selects output data format Remote Local Remote Local Selects output data format Remote Local Selects output data format Remote Local Selects output data format Selects output data format Remote Local Remote Local Interrupt No Interrupt Remote Local Error Remote Local InLimit Remote Local In Limit and Error Remote Local End of Conversion Remote Local Error and End of Conversion Remote Local In Limit and End of Conversion In Limit Error and End of Conv Remote Local Remote Local Wait Value 87 Value Wait value Remote Local Controller 5 Controller OFF Remote Set pointratio Remote Set point preset Remote Local Enable error reporting Remote Local RateonFi Remote Rate on F2 Remote Rate on F3 Remote Rate value Remote Zero Remote Tare value Remote Tare OFF Remote Tare ON Remote Close Isolation Valve Remote Open Isolation Valve Remote Close Isolation Valve Remote Open Isolation Valve Remote Controller ON Set p Preset Rate Value V lt Value gt 86 Value Zero O1 28 Tare B lt Value gt 66 Value TO 32 T1 31 Isolation Valve EO 17 E1 18 0to 11 0to 11 81 Jt Table 4 1 RS 232 and IEEE Command Summary K163 Issue No 3 4 6 D
95. us 3 gt lt terminator gt Example LOCROS1D2COI3F21 Notation Code N3 Format n limit status 1 gt lt error status code 3 gt lt terminator gt Example 0 01 If no errors occur or error reporting is disabled then the error status code is omitted Notation Code N4 Format error status 2 terminator code 2 gt lt rate 2 gt variable rate 8 units 7 terminator Example 1E1J2V 0 0025U mbar Notation Code N5 Format DPI520 lt accuracy 3 gt lt fullscale 12 gt lt serial number 7 gt lt terminator gt Example DPI520 A1 70 0000 barg 2222 K163 Issue No 3 4 Operating Instructions 4 15 Notation Code N7 The status condition of the instrument is sent as lt mode 3 gt lt range 2 gt lt scale 2 gt lt value source 2 gt lt controller status 2 gt lt interrupt code 2 gt lt notation code 2 gt lt wait time 4 gt lt terminator gt Example REMR1S3D1C0ION4W002 Notation Code N8 The full status condition of the instrument is sent as lt mode 3 gt lt range 2 gt lt scale 2 gt lt value source 2 gt lt controller status 2 gt lt interrupt code 2 gt lt notation code 2 gt lt wait time 4 gt lt error status 2 gt lt terminator code 2 gt lt rate 2 gt lt variable rate 8 gt lt units 7 gt lt tare 2 lt tare value 8 gt lt terminator gt Example REMR1S3D1COION4W002 1E1J0V 000001 U PaT1B 000010 K16
96. uses a build up of heat in the valve The valve is protected against failure in these circumstances by a temperature sensor but operation of this sensor will disable the controller until the valve temperature falls Repeated operation of this protection circuit will reduce reliability Avoiding Overshoot To avoid overshoot use the AUTO rate and set AUTO SPEED and AUTOMAX for optimum performance see 3 9 2 Filling and Venting Times The user will often wantto estimate how long it will take to reach a certain pressure in a system using this instrument Many factors affect the rate at which the instrument will pressurise or evacuate the user s system such as O Supply Pressure and Outlet Pressure viz differential pressure across the control valve This is the motive force which drives gas through the valve orifice Assumingthe supply pressure is constant then the differential pressure falls as the outlet pressure rises Thus the flow through the valve is not constant as the user s system is filled K163 Issue No 3 EL 3 24 DPI 520 User Manual O Controller RATE Setting see 3 9 2 Assuming the system volume is small such that flow rate through the control valves does notlimitthe fill time then the controller RATE setting will determine the dynamic performance The RATE settings are MAX for the fastest response but with overshoot AUTO giving slower operation without overshoot RATE giving a linear ramp rat
97. ware handshaking applications The command takes one oftwo values Enabled or Disabled Connections between an instrument and host computer are shown on pages 3 12 to 3 16 Checksums Determines circumstances under which a checksum is added to data packets for transmission error detection purposes Takes one of three values None Auto Always None No checksum added Auto Checksum added to all data output by the instrument Input commands can have a checksum or not If a checksum is present then it must be correct Always Checksum added to output and is mandatory on input data DPI 510 This command enables a DPI 520 to emulate a Druck DPI 510 controller i e to recognise the DPI 510 command set It takes one of two values YES or NO K163 Issue No 3 o 3 42 DPI 520 User Manual COMMS QUIT F2 F1 QUIT SET FOR RUI F2 ENTER UNIQUE ADDRESS 4r H F1 QUIT SET FOR PC F1 F3 ADDRESS 16 F1 ENTER NEW PIN lt gt A4 F3 YES CR LF EO s F1 CR F1 LF F1 SP F1 ESSED F1 MODE _ Alter DIRECT A A F 7 Next F2 F2 F1 ee Quit F1 ADDR F3 2 2 2 PRINTER Y Figure 3 14 RS232 Set up Menu Sheet 1 To Sheet 2
98. wed into the port can reduce display noise on low pressure instruments To connect the reference line proceed as follows K163 Issue No 3 3 Installation 3 23 3 8 3 CAUTION The REFERENCE port pressure must NOT exceed two times the full scale pressure range or 2 bar whichever is the smaller or the internal pipes and integral transducer could be damaged O Fit the reference line to the Reference port as shown in Fig 3 9 fitting a bonded seal between the pressure union and the measuring port Note that reference port has an M5 thread fitting Ensure that the coupling is tight Obtaining the Best Performance Optimum Source and Vent Pressures The instrument pressure controller can only supply pressures that are within the range of the source and vent supplies and will only control to specification within 596 of the supply pressures The recommended source pressure is 11096 ofthe range selected e g 77 baron a 70 bar range The vent pressure should be 596 below the minimum required pressure This means that an instrument which is required to fully control not just vent at zero bar gauge requires a negative pressure on the vent port If itis decided simply to use the instrument to vent down to zero bar g no vacuum on the vent port care must be taken not to demand zero pressure for more than approximately one minute This is because the release valve will be operating outside its normal controlling mode and this in turn ca

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