maintenance manual for jem®1 series joule electronic meters
Contents
1. a EN MAS qu 20 Electtonic Register zarte saa ose 33 EXV REGISTER mia NP 38 EXT Controller een 43 EXT Dauchter Boatd su 44 Display Boat otitis 45 Communication Interface Board 46 Multiaccess Communication Interface Board 47 Communication Interface Board essere 48 Ground Plane Neon UR etos tile as ned bn Med 49 SECTON TECTUM 72 JEM Meter Interconnection Wiring Diagrams 80 SECTION NER 88 JEM Meter Schematic and Assembly Drawings See 89 10 11 12 13 14 15 16 17 18 19 LIST OF ILLUSTRATIONS FIGURE NAME Power Supply 504KHRZ ZA AA Se A Power Supply 2 016 2 Power Supply Test Point Locations Test Points Watt Q Multiplier Chopper Waveform for Watt Multipliers Triangle Wave Green Test Point WatuQ Var Multiplica Chopper Drive Signal Pin 3 CD4007 Watt Q Multiplter Superimposed Multiplier Waveforms Analog Test Ja2. VhExpScale nuu m ja ha bh 141 2 3 4 T Analog only b b b 12099 va t ha bho b 202 3 kWh out 1 5 4 kWh in 2 3 212 3 lag 1 5 4 kVARh lead 2 3 302 3 kWh 1 5 kQh 5 304 kWh 1 5 kQh 312 3 kWh 1 5 4 kVARh lag 1 5 2 3 E 1 4 2 3 3 2 1 5 N I I tA 322 3 kWh out 4 kWh In kVAR 332 3 kW 4 kVAR 342 3 kWh 4 kVAR 74 3 6 TABLE 10 JEM JUMPER SELECTION CHART Reference Figure 34 v AREA 1 2 4 VAR Q FUNCTION JUMPERS PER JUMPERS JUMPERS PEE 351 5 2 4 3 4 N 362 kVARh lead LED 382 3 4 kWh out kWh in m 1 N 1 1 1 1 pa 1 1 1 5 2 3 2 4 M kWh out kWh in 432 3 kWh u I Amp E iw 75 TABLE 10 JEM JUMPER SELECTION CHART Reference Figure 34 MODEL AREA1 AREA2 AREA3 4 VAR Q NO FUNCTION JUMPERS JUMPERS JUMPERS JUMPERS JUMPERS 1 4 452 3 kWh out 1 5 1 5 kWh in 2 3 2 3 Var Volt 472 3 kWh out 1 5 1 5 kWh in 2 3 2 3 Volt I Amp 492 3 4 kWh 1 5 1 5 ka sa Volt 502 3 kW 1 5 1 5 V k 504 kW E k 512 3 kW V k 514 kW V k 522 3 kW UE kVARh 76 h h Qh h h Qh h 2h Qh h 2h Qh h 2h TABLE 10 JEM JUMPER SELECTIO
3. WARNING The first step is to de energize the meter and completely isolate it from all service lines Never dismantle an energized meter WARNING Disconnect the telephone line from J2 before replacing F1 and or F2 The telephone line can have high voltages present Fuses F1 and F2 should be replaced with Scientific Columbus Part Number 6006 305 Multiaccess EXJ Communication Interface Board For non switchboard JEM1 models Board Description The Multiaccess EXJ Communication Interface Board 13397 001K provides transient surge protection for RS 232 20 mA digital current loop and R T option interfaces The subminiature D connector P1 and terminal blocks TB1 TB2 and TB3 are connected in parallel to interface the JEMI with the field Header J1 15 paralleled with J2 J3 These terminals provide the interface between the Multiaccess Board and the EXJ Theory of Operation The Multiaccess Communication Interface Board utilizes unidirectional and bidirectional transient surge suppressors which react to clamp incoming voltage transients to within acceptable limits User Serviceable Components No user serviceable components exist on the Multiaccess Board 47 COMMUNICATION INTERFACE BOARD For switchboard JEM1 models 48 Board Description The EXJ Communication Interface Board PCB 13535 001 K provides transient surge protection for RS 232 current loop R T option and modem interfaces The
4. CD4007 Watt Q Multiplier 7V 17 Comparator PT Input Triangle Output 60 Hz Wave Figure 8 Superimposed Multiplier Waveforms Load Resistor Typically 1 KA DC Voltmeter High Impedance Test Plug Switchcraft 4850 or Equivalent Note Analog Output Terminal at backplane or F Option output connector must be shorted to use Analog Test Jack Figure 9 Analog Test Jack 18 TABLE 4 WATT Q MULTIPLIER TROUBLESHOOTING GUIDE Symptoms No output 413 expected output on single phase test Partial output Possible Cause Incorrect wiring 2 1 2 Element Wattmeter One or more elements not functioning Blown choppers Action Required Refer to Instruction Manual Re check input wiring If using test jack analog output on the backplane must be shorted None 2 1 2 Element Wattmeter produces 4 3 expected output in single phase test Check CT waveform See waveform amp test point Check CT waveform and replace IC if necessary 19 INTEGRATOR This section contains Figure 10 Calibration Component and Test Point Location Figure 11 Waveforms Table 5 Troubleshooting Guide OUTPUT PULSE RATE CAL NETWORK EN 1234567 PULSE HIE El OUTPUT FWD PULSE OUTPUT EB LOAD RATE INDICATOR Q Waveform Reference Applies to bidirectional integrators only Calibration Component and Test Point Location Only components shown are for
5. Capacitor _ Connector A 1 1 B 1 10 C 1 100 Divider E Circuit 16 Bo 00000000 Potential indicator Circuit Drive Circuit o Indicator or Circuit La Ade ome 145 Counter 1 Counter 2 Counter 3 Electro mechanical Calibration Component and Test Point Locations Only components shown are for location of test point See assembly drawing for complete details Figure 16 30 Test Point Reference 14V OV 14V OV 14V OV 14V WU UU UU UU UU Input signal to register from integrator If jumper is in Pos A each transition causes register count Tp time period for one count is 10 transitions of input signal A when divide by 10 operation is installed Tp is 100 transitions of input A for divide by 100 operation Capacitor discharge Typical Cl C3 C5 Capacitor discharge Typical C2 C4 C6 assuming divide by 10 input Figure 17 Electro mechanical Register Waveforms 3l 8 ELECTRO MECHANICAL REGISTER TROUBLESHOOTING GUIDE SYMPTOMS Register does not count 32 POSSIBLE CAUSE Loose cable connector Divider circuit not functioning if installed If signal is present at the divider select jumper a b or c then the problem Is either in the counter drive circ
6. Figure 9 Table 4 VAR MULTIPLIER Shows the Watt Q multiplier test point locations Shows the chopper waveform obtained from the yellow test points The green test point will give a triangle wave as shown in Figure 5 Triangle Wave Green Test Point Watt Q Var Multiplier Illustrate the chopper drive signal that is obtained from pin 3 of one of the CD4007 s Shows the multiplier waveforms superimposed Illustrate a test circuit for the analog test jack Common Watt Q Multiplier symptoms Test points for the Var multiplier card are the same as a Multiplier card Operation of the Var multiplier is identical to the Watt Q multiplier except for phase shifters which are used to obtain a 90 phase shift of voltage signals before multiplication with the current signals For a list of Var multiplier symptoms see Table 4 since the Watt Q multiplier symptoms are identical 15 ANALOG TEST 5 ADJUST B TRIANGLE WAVE TEST POINT LJ PT INPUTS CHOPPERS CHOPPER WAVEFORM YEL TEST POINT Figure 4 Test Points Watt Q Multiplier Observe each signal at test points TP2 TP4 Yellow Compare symmetry amplitude distortion etc for evidence of proper operation Figure 5 Chopper Waveform for Watt Multipliers 16 Figure 6 Triangle Wave Green Test Point Watt Q Var Multiplier Imm 16 66MS 1 Figure 7 Chopper Drive Signal Pin 3
7. Two versions of the Ground Plane board are used depending on the packaging style of the individual meter 1 For all non switchboard JEMI meters the EXJ Register requires the Ground Plane Board PCB part number 12711 001 2 Forall switchboard JEMI meters the EXJ Register requires the Ground Plane board PCB part number 13658 001 49 CROSS REFERENCE CHART SILK SCREEN AND SCHEMATIC DRAWINGS BOARD PAGE NUMBER SILK SCREEN SCHEMATIC Controller Display Communication 65 66 B1G13268 001x C B1E13269 001x B Interface non switchboard models 67 68 B1G13268 001x C BIE13269 001x B Multiaccess B1G13396 001x C 1 13397 001 Communication Final Assembly Interface number 13397 001 Communication 71 72 B1G13534 001x B B1E13535 001x B Interface Switchboard Models 50 15 MAIN BOARD JEMI y B1G12329 001x D R14 9 1 2 ce3 un CONTROLLER SILK SCREEN REVISIUN A Figure 23 51 52 CONTROLLER BOARD SILK SCREEN REVISION B Figure 24 53 54 a EXJ CONTROLLER BDARD SILK SCREEN REVISIUN D Figure 25 39 1012799 001 DAUGHTER BD 5 EXJ DAUGHTER BOARD SILK SCREEN 57 58 R106 R107 DISPLAY BOARD RE R109 R110 R104 W 1612327 001 REV A EXJ DISPLAY BUARD SILK SCREEN REVISION A Figure 27 59 60 05101 R106 Riog R107 1101 Comi
8. Connect to front panel controls Programming switch set incorrectly Battery defective or not properly installed Data lost due to removal of battery without power amplifier or due to handling of register module ACTION REQUIRED Check main power supply regulator input connector Check input connector cable and insure that retainer is in place Check inter connection to front panel switches Field programmable variations are defined in Section 3 of Instruction Manual Check battery voltage Replace if below 2 7 Vdc If register information is lost by lack of battery power or other cause it may be necessary to initialize the register by shorting the contacts provided NOTE All readings are cleared by the initializing action 3d EXJ REGISTER INTRODUCTION 38 The Scientific Columbus EXJ Register is a multifunction programmable register communications controller that may be installed in any of the JEM 1 family of electronic meters As opposed to the traditional mechanical registers previously used in the JEMI the EXJ Register can be configured by the user to operate with any JEMI meter In addition the EXJ Register contains a nonvolatile real time clock a nonvolatile data storage with mass memory option and serial communications compatible with 20 mA digital current loop optical and RS 232C V 24 interfaces and optional internal modem The Register is a direct
9. IC CD4007 Counter Chip IC CD4040 EXJ RAM Chip w External Battery IC Timekeeper E Series Register Battery Electrochem Panasonic E Series Register Battery Mallory Roll Reset Switch Harness Front Panel Input Varistors 150V MOV Transistor MPS A14 Replacement Card Guides Surge Arrestor Kit 120V Surge Arrestor Kit 480V Extender Test Board Register Ribbon Cable main Register Communications Ribbon Cable Front Panel Order the type your unit uses CALIBRATION PARTS 70 Description Type CAL Network A CAL Network B CAL Network C CAL Network D CAL Network E Slow Count Module K X100 EXJ SET Software SCI Part 08304 001 06754 003 05441 002 05430 003 12275 002 06271 002 11750 001K 05918 001 06297 007 06362 001 06772 001 11282 002K 11282 005K 04021 001K 06280 001 12461 002 SCI Part 10316 001K 10316 002K 10316 003K 10316 004K 10316 005K 04677 001K 12623 001 JEMO1 P C BOARD LIST NOTE Different Model 5 use different boards Always specify Model s when ordering boards Using the proper parts is important Function Boards Power Supply Watt Q Var UNI Integrator BI Integrator Volt Analog only Volt Hour Volt Analog only Volt Hour Volt Hour Expanded Scale Ampere 3 element Ampere 3 element Volt Ampere 1 element Volt Ampere 2 element Volt Ampere 3 element Volt Ampere 2 1 2 element Specialized Boards UNI Integrator Dual KYZ UNI Inte
10. MERCHANTABILITY OR FITNESS FOR PURPOSE In no event shall Seller be liable hereunder for any special indirect incidental or consequential damages including but not limited to loss of revenues or production PROPRIETARY NOTICE The information contained in this publication is derived in part from proprietary and patented data Scientific Columbus This information has been prepared for the express purpose of assisting operating and maintenance personnel in the efficient use of the JEM Series meters and publication of this information does not convey any rights to reproduce it or use if for any purpose other than in connection with installation operation and maintenance of the equipment described herein U S Patent Numbers 3 976 942 3 971 979 3 975 682 3 794 917 JEM is a Registered Trademark of Scientific Columbus EXJ is a Trademark of Scientific Columbus Copyright 1989 and 1990 Scientific Columbus rights reserved TABLE OF CONTENTS SECTION ap laz ictum Chao Cue ap delV a uA Gl NARRA DUNS la 1 SBGTION teaser 3 Precautions e 3 SECTION eS 5 Troubleshooting and Testing eet Hand 5 Subassemblie sociedad ae tedio neste eios D 8 PO WEL SUD SS eine ana 8 A 20 ELLI ERR E ETE EE E MR 23 Electro Mechanical Register
11. Mechanical Register Single 5 29 5 30 Dual 5 29 5 31 Triple 5 29 5 32 Register Register Bot Without COED With COED With R Options With T Options 5 2 Insert the following drawings in the order shown D03891 001 B03792 001 B03792 002 C05702 001 B05701 001 C05180 001 B05014 001 05014 000 C C05180 002 B05014 002 05014 000 C C05180 003 B05014 003 05014 000 C C04813 002 B04812 002 04812 000 C C04813 001 B04812 001 04812 000 C B1E14438 001x C B1D14438 001x C C04817 001 C048 16 001 C048 16 002 C048 16 003 C04013 001 B04011 001 C04013 002 B04011 002 D04561 001 C04559 003 D04561 002 C04559 002 D04561 003 C04559 004 D04561 003 C04559 005
12. SE BOARD 195 gt 1 ie Ti 11 J103 04 R112 R104 R103 1 B1G12327 001x C REV B DISPLAY SILK SCREEN REVISION B Figure 28 61 62 R108 ERJ BOARD 5 Rio DS102 2 1 1 B1G13542 001x A DISPLAY BOARD SILK SCREEN REVISIUN B Figure 29 63 COMMUNICATION INTERFACE BOARD B1G13268 001x C 26 15 1 5 UR4 16 2 URS UR6 28 29 ma 50 0 31 52 n COMMUNICATION INTERFACE BOARD SILK SCREEN REVISIDN NONE 65 EXJ COMMUNICATION INTERFACE BOARD 81612268 001x C REU A 26 15 1 JE mies 2i URS UR4 CRS CR4 INTERFACE BOARD SILK SCREEN REVISIUN A Figure 31 66 Sls Fae COMMUNICATION INTERFACE BOAR JZ 5 252 4 Assn Mime REU m CRZ CRe m E CRO n S RT ir 10 20 Y TxD TxD RxD RxD 21 20mA m K 22 2 TxD GND RxD 2 pc 24 Ko 22 MULTIACCESS EXJ COMMUNICATION INTERFACE BOARD REVISION NONE CATION INTERFACE BOARD SWBD 232 J6 81613534 001 REU A R LI 6 4 7 COMMUNICATION INTERFACE BOARD SWITCHBDARD MDDELS SILK SCREEN REVISIUN A 69 JEM 1 RECOMMENDED SPARE PARTS LIST REPAIR PARTS Description Type Output Isolator IC OMA121 Output Isolator early version IC H11DX Chopper Chip
13. board is functionally composed of two parts The components located between the subminiature D connector P1 and the three 5 pin headers J4 J5 and J6 provide surge protection for RS 232C current loop and R T option Modem surge protection is provided by the components located between the RJ 11 receptacle and the 2 pin header J3 Theory of Operation The RS 232C 20 mA digital current loop and R T option surge protection is provided by unidirectional and bidirectional transient surge suppressors which react to clamp incoming voltage transients to acceptable limits Two stages of metallic oxide varistors are utilized to protect the modem from common and transverse mode voltage transients Fuses which are in series with both line and tip protect the metallic oxide varistors from transients with too great of energy content User Serviceable Components WARNING The first step is to de energize the meter and completely isolate it from all service lines Never dismantle an energized meter WARNING Disconnect the telephone line from J2 before replacing F1 and or F2 The telephone line can have high voltages present Fuses F1 and F2 should be replaced with Scientific Columbus Part Number 6006 305 GROUND PLANE BOARD Functions The Ground Plane board serves two functions 1 Provides an additional margin of EMI RFI shielding for the EXJ Register 2 Serves as a physical mounting platform for the register Versions
14. A Zener Reference CR2 defective Remove individual PC boards one at a time to determine if one or more subassemblies are loading the Power Supply Note the position of each board and return to the same position Return to factory for repair Q2 04 can be removed since they provide short circuit protection If Power Supply returns to 14 replace with same type transistor Return to factory for repair 11 12 SUPPLY USC BOARD JEM 0000000 O 0000000 25 jm MOM 1 PDWER SUPPLY 504 KHZ DSC BDARD SILK SCREEN REVISION A Figure 1 POWER SUPPLY USC BDARD JEMi 01 Ul 3 OS Re 006000000 n 217 RIG OO cS IR C1 72 0091 q O O O se gt 2 d 726 RS 0000000 0000000 C17 aii 00000000 0000000 UT O o0ooooon x 7 D ID 0 O 0 0000000 lo R1 US C19 JEM1 POWER SUPPLY 2 0160 MHZ OSC BOARD SILK SCREEN REVISION A Figure 2 13 PIN F CLAD SIDE 14 NUMBERS ON COMP SIDE OSC SIGNAL AC INPUTS LETTERS ON CLAD SIDE moon UU UU UU UU UBI CU Vr Adj R16 SELECTED 5 8500 14 OSC 504KHZ V 14 Vde 17 U 18 Figure 3 Power Supply Test Points WATT Q MULTIPLIER Figure 4 Figure 5 Figure 6 Figure 7 Figure 8
15. GLE HEADER CONTROLLER a GROUND PLANE BD BOARD ASSEMBLY B1H12711 002x C Figure 20 Pre Switchboard Configuration Non Switchboard Only Part No 12711 002 40 The direct pluggable feature was deleted in favor of the more versatile ribbon cable interconnect thus allowing standardized controller board assembly and display board assembly modules to be used on both switchboard and non switchboard models of the JEMI meter See Figures 21 and 22 DISPLAY 1 INCH DISPLAY ASSEMB INTERCONNECT CABLE CONTROLLER GROUND PLANE BD BOARD B1H12711 002x C ASSEMBLY Figure 21 Post Switchboard Configuration Non Switchboard Models Part No 12711 002 41 REGISTER COMPATIBILITY Continued DISPLAY ASSEMBLY 6 INCH DISPLAY INTERCONNECT CABLE CONTROLLER BOARD ASSEMBLY a GROUND PLANE BD B1H13658 001x A Figure 22 Post Switchboard Configuration Switchboard Meters Part No 13658 001 Pre switchboard EXJ Registers cannot be used on switchboard models Post switchboard cable connected EXJ Registers with the use of the appropriate display interconnect cable and ground plane board can be used on any model of the JEM1 meter 42 EXJ Controller Board Board Deription The Controller Board assembly is the heart of the Register It contains all of the functional elements of the register except the Liquid Crystal Display and display driver circuits and the communications interface circuits The Controller b
16. J Daughter Board contains a large electrolytic capacitor which stores enough energy to allow the microcontroller to perform a graceful shutdown This board is used on Revision A only The EXJ Daughter Board also adds hysteresis to the power line frequency monitoring circuitry to eliminate electrical noise User Serviceable Components WARNING The first step is to de energize the meter and completely isolate it from all service lines Never dismantle an energized meter Problems may be traced to a disturbed connection between the EXJ Daughter Board and the EXJ Controller Board Revision A If a problem does arise please check this connection After removing power from the JEMI firmly seat the EXJ Daughter Board into socket U9 EXJ Display Board Board Description The EXJ Display Board provides an interface between the EXJ Controller Board and the Liquid Crystal Display Module The board contains optical interface circuitry temperature compensation for the Liquid Crystal Display Module and a multiturn potentiometer for display angle adjustment Theory of Operation The EXJ Display Board employs two functionally independent circuits for control of the Liquid Crystal Display Module The display viewing angle is temperature dependent Therefore thermistor based temperature compensation is used to maintain the user set viewing angle The viewing angle can be adjusted over approximately a 45 degree angle in the vertical plan
17. MAINTENANCE MANUAL FOR JEM 1 SERIES JOULE ELECTRONIC METERS YF 09175 001 N Revision D March 1999 WARRANTY Seller warrants its Equipment to meet applicable specifications if any and to be free from defects in material and workmanship for a period of one 1 year from date of shipment to the original Purchaser Upon receipt of prompt written notice from Purchaser referencing the order number and detailing the claimed non conformity or defect Seller shall at its option repair or replace the Equipment Inbound shipping charges to Seller s factory in Rochester NY or other designated facility are the responsibility of Purchaser Normal shipping charges for the return to the Purchaser of repaired or replacement Equipment shall be the responsibility of the Seller North American points only Repair or replacement of the Equipment in the manner above is the exclusive warranty remedy and shall constitute complete fulfillment of all Sellers liabilities for breach of this Warranty Seller assumes no responsibility hereunder for any Equipment damage or failure caused by a improper installation operation or maintenance of the Equipment or b normal wear and tear on disposable and or consumable parts This Warranty shall be void in the event of unauthorized modification or servicing of the Equipment THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTIES OF QUALITY WHETHER EXPRESS OR IMPLIED INCLUDING ANY WARRANTY OF
18. N CHART Reference Figure 34 MODEL AREA1 AREA2 AREA4 VAR Q NO FUNCTION JUMPERS JUMPERS JUMPERS JUMPERS JUMPERS 532 3 KWh 1 5 2 4 2 4 1 4 4 542 3 4 552 3 4 562 3 4 kWh out kWh in Volt 2 12 572 3 4 kVARh lag kVARh lead 582 3 4 592 3 4 kWh out Customer Customer kWh in Selected Selected kVARh 4 Quad 602 3 kWh out 4 kWh in kVARh lag kVARh lead 77 MODEL AREA 1 2 FUNCTION JUMPERS JUMPERS JUMPERS 622 3 4 642 3 4 652 3 4 662 3 4 78 TABLE 10 JEM JUMPER SELECTION CHART kWh out kWh in kQh kWh out kWh in kQh kWh kVARh lag kVARh lead kWh out kWh in kVAh kWh out kWh in kQh V2h kWh out kWh in kQh V2h kWh Vh kVARh lag kVARh lead kWh kVARh lag kVARh lead Volt h Reference Figure 34 AREA 4 JUMPERS VAR Q UMPERS TABLE 10 JEM JUMPER SELECTION CHART Reference Figure 34 MODEL AREA 1 2 4 FUNCTION EE TEES i 682 3 4 kWh out kWh in kVARh 692 3 4 kWh out kVARh 702 3 4 kWh out kWh in kVARh lag kVARh lead Volt 2h 79 TABLE 10 JEM JUMPER SELECTION CHART Reference Figure 34 MODEL AREA 1 2 4 FUNCTION JUMPERS JUMPE
19. RS JUMPERS JUMPERS JUMPERS Chl 1 5 1 5 1 5 1 5 6590 Ch2 Ch3 JEM Meter Interconnection Wiring Diagrams Description Drawing Number Model 303 KWh KQh B06050 002 Model 533 KWh Vh KVAh B06050 003 Model 603 KWh KVARh B06050 001 Model 643 KWh KQh V h B06050 004 80 SECTION 5 SCHEMATIC AND ASSEMBLY DRAWINGS This section contains all the schematic and assembly drawings for JEM subassemblies such as the Watt Var Multiplier Unidirectional Integrator Electronic Register with COED etc Each drawing is the current version Your board could vary slightly depending on age If you have any questions please call the Scientific Columbus Technical Support number at the rear of this manual SCHEMATIC AND ASSEMBLY DRAWING CROSS REFERENCE CHART DRAWING DRAWING B M D03891 001 Multiplier 5 5 kVA T A M 05701 004L i Mosfet Output 5 9 5 17 5 18 C05180 001 Baage 5 11 5 12 C05180 002 B05014 002 05014 002L Bridge Output 5 13 5 17 5 18 C05180 002 Mosfet Output per Expanded Scale 5 15 5 16 B05014 003 05014 003L Volt Bridge Output 5 14 5 17 5 18 C05180 003 Mosfet Output p Unidirectional 5 19 5 20 B04812 002 04812 002L Integrator Bridge Output 5 21 5 25 5 26 C04813 002 Mosfet Output Bi directional 5 22 5 23 C04813 001 B04812 001 04812 001L Integrator Bridge Output 5 24 5 25 5 26 C04813 001 Mosfet Output Power Supply 5 27 5 28 B1E14438 001x C B1D14438 001x C Oscillator Electro
20. VE AUXILIARY POWER AND INPUT SIGNALS WHEN INSERTING OR REMOVING SUBASSEMBLIES FROM THE JEM METERS Introduction This section contains special handling procedures needed when testing or troubleshooting the meters Related Pages CMOS Handling Procedures CMOS HANDLING PROCEDURE Introduction Recognition Handling and Insertion Hand Soldering CMOS complementary symmetry metal oxide semiconductor devices are used because of their attractive properties such as low power dissipation and high noise immunity Because of their high impedance they are subject to damage by exposure to static charge therefore special care is required in handling of CMOS devices or subassemblies containing CMOS devices Even though input protection circuits have been added by every manufacturer the following procedure must be used each time CMOS devices are handled to avoid accidental destruction of IC s The following CMOS dual in line integrated circuit series are used a CD40XX BF b CDPXXXXCD MWSXXXXDL d MC140XX CL Step Procedure 1 The work bench surface is to be grounded and conductive 2 The assembler should refrain from wearing any nylon clothing 3 The assembler is to be grounded by a conductive wrist strap through a 1 megohm resistor or equivalent 4 CMOS devices are to remain in their conductive carriers until they are ready to be inserted pertains to new replacement IC s received by cus
21. ck euere Calibration Component and Test Point Locations Integrator Waveforms for Analog to Pulse Converter Calibration Component and Test Point Location pisc rie e e trud Volt Volt Expanded Scale Volt Calibration Component and Test Point Locations Volt Analog Vh Integrator Waveforms Electro mechanical Register Calibration Component and Test Point e ARM alda alel ame Electro mechanical Register Waveforms Electronic Register Calibration Component and Test Point Location ee Waveforms and Test Point Descriptions 14 16 16 17 17 18 18 20 21 23 24 26 27 30 31 34 35 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Section 5 Register Pre Switchboard Configuration non switchbd 40 EXJ Register Post Switchboard Configuration non switchbd 41 EXJ Register Post Switchboard Configuration switchbd 40 Controller Board Rev A 51 Controller Board Rev B 53 Controller Board Rev D 55 EX Daughter Boa
22. e with the multiturn potentiometer R101 User Serviceable Components The 15 turn potentiometer provides contrast and viewing angle adjustment for the Liquid Crystal Display Module Clockwise rotation increases the contrast and raises the viewing angle Counterclockwise rotation decreases the contrast and lowers the viewing angle 45 Communication Interface Board For non switchboard JEM1 models 46 Board Description The EXJ Communication Interface Board PCB 13269 002K provides transient surge protection for RS 232C current loop R T option and modem interfaces The board is functionally composed of two parts The components located between the subminiature D connector P1 and the 16 pin header J1 provide surge protection for RS 232C current loop and R T option Modem surge protection is provided by the components located between the RJ 11 receptacle J2 and the two pin header J3 Theory of Operation The RS 232C 20 mA digital current loop and R T option surge protection is provided by unidirectional and bidirectional transient surge suppressors which react to clamp incoming voltage transients to acceptable limits Two stages of metallic oxide varistors are utilized to protect the modem from common and transverse mode voltage transients Fuses which are in series with both line and tip protect the metallic oxide varistors from transients with too great of energy content User Serviceable Components
23. ero crossing detector signal at this point Integrator Waveform Frequency of conversion is proportional to volt or volt analog signal RS Flip flop signal The number of cycles of waveform is determined by the binary divider setting Figure 15 Waveforms 27 TABLE 7 VOLT VOLT EXPANDED SCALE VOLT CARD TROUBLESHOOTING GUIDE SYMPTOMS POSSIBLE CAUSE ACTION REQUIRED No analog output or No input to circuit Verify waveform at test output does not respond point a Possible properly to input connection problem If input is present and board is determined to be defective the problem can be isolated to a probable component problem by observing waveforms Figure 14 15 Waveform b incorrect Replace IC 1 IC 3 IC 4 Applies to V function Waveforms a and b Replace IC 3 okay Waveform c incorrect Waveforms a b and c Replace IC 1 IC 2 okay No pulse output K YZ Check integrator section analog okay waveforms to isolate faulty components Waveform d not correct Replace IC 6 IC 7 IC 8 Waveforms d and e Replace IC 5 or IC 11 correct f not correct IC 12 28 ELECTRO MECHANICAL REGISTER This section contains the following Figure 16 Electro mechanical Register Calibration Component and Test Point Location Figure 17 Electro mechanical Register Waveforms Table 8 Troubleshooting Guide 20 Decoupling amp Register Holding Input Divider Select Jumper
24. grator Dual Watthour Dual K YZ ZZ Polarity Detector Reversal Shut Down 6590 Input Board 6368 Volt Summing Specify Calibration Register Boards EXJ E Series E Series Coed Single Mechanical Dual Mechanical Triple Mechanical Quad Mechanical PT Indicator Board E Series Display Up View Display EXJ Down View Display EXJ Down View Display Specify Configuration and Model SCI Part 03793 001L 03792 001L 03792 002L 04812 002L 04812 001L 07620 001K 05014 002L 07620 002K 05014 001L 05014 003L 11385 006L 11385 003L 05701 004L 05701 001L 05701 003L 05701 002L SCI Part 04812 101L 04812 003Z 08680 001L 07945 001K 11334 001L 04776 001K SCI Part 12330 002K 04559 004L 04559 006L 04816 001L 04816 002L 04816 003L 04609 001L 04816 004Z 04555 001K 12328 001K 12298 001 11695 002 10158 002 Qty 2 71 SECTION 4 SIGNAL JUMPER REQUIREMENTS AND TYPICAL BLOCK DIAGRAMS l 2 72 Jumper Requirements Figure 34 illustrates a rear view of the JEMI Backplane Circuit Board Solid lines represent backside circuitry and dotted lines represent opposite side circuitry This figure details the location of five 5 jumper areas Table 10 identifies which connection points in each area must be jumpered for each individual model number These jumpers are factory installed The only time jumper relocation may be required is if circuit card function are changed or added
25. it component Zero crossing detector Input multiplexer Current squaring circuit ACTION REQUIRED Check waveforms at test points to isolate problem Replace IC 4 Replace IC 2 Replace IC 14 IC 9 Waveform e incorrect Voltage squaring circuit Replace IC 7 IC 13 IC 8 Replace IC 11 IC 10 IC 7 Waveforms a b c d e okay f incorrect Square root or output circuit IC 12 25 VOLT VOLT AND EXPANDED SCALE VOLT CARD This section contains Figure 14 Calibration Component and Test Point Location Figure 15 Volt Analog Vh Integrator Waveforms Table 7 Troubleshooting Guide ANALOG CAL R42 IC3 EJ 7654321 ANALOG LOAD RATE 4 J INDICATORS slelelelelele OUTPUT OUTPUT PULSE RATE elelelslelole PULSE RATE CAL 8 Volt Volt and Expanded Scale Volt Calibration Component and Test Point Locations Only components shown are for location of test points See assembly drawing for complete details FIGURE 14 26 Test Point ef Xr dq X9 9 dex Sy OV OV V2h 14V OV V Vh 14 8 V 14V OV 14V OV Volt Analog Waveforms Triangle wave is used only in V2 circuit Location b is grounded in volt circuits Modulated waveform of v2 circuit Volt circuits other than V2 produce a z
26. location of test points See assembly drawing for complete details Figure 10 Calibration Component and Test Point Location 20 Test Point Reference 8 7v Ov 14v Ov 14v Ov 14v Ov 6v Td BELA Integrator Output i Varies with input AV and calibration Td one cycle of integration 1 Tr reset time fixed 2m sec Iref Drop Across R9 quc tris eei me Period of One Output Count Figure 11 Integrator Waveforms for Analog to Pulse Converter 21 TABLE 5 INTEGRATOR TROUBLESHOOTING GUIDE SYMPTOM No KYZ output Also no register counts or load rate indication No KYZ output Register and load rate indicators working Creep output counts with no load KYZ output out of calibration or won t calibrate 22 POSSIBLE CAUSE Analog signal wrong polarity Crystal oscillator failed on Power Supply Board Other component failure Output driver IC 13 Opto couplers IC 14 15 16 17 Excessive offset in Multiplier card Excessive bias current in input IC 4 Wrong calibration components or divider tap selector installed ACTION REQUIRED Check polarity of analog output Possible connection error Check oscillator waveform at Power Supply yellow test point Isolate problem by using waveform test points on Figures 10 amp 11 Replace defective component or exchange P C assembly Remo
27. mponents or even loose cable assemblies may be found WARNING DO NOT DISCONNECT THE AUXILIARY POWER WITH THE POTENTIAL AND CURRENT APPLIED TO PT S AND CT S DO NOT REMOVE OR INSTALL ANY INDIVIDUAL CARD WITH THE AUXILIARY POWER APPLIED TABLE 1 METER TROUBLESHOOTING GUIDE SYMPTOMS POSSIBLE CAUSE ACTION REQUIRED Unit totally inoperable Auxiliary power not Check wiring Check nameplate data within acceptable limits Register not functioning Loose cable connection Slide register out and verify 16 contact cable assembly is firmly inserted into socket and held in place with rubber retainer Verify cable is firmly attached to backplane Refer to Instruction Manual Specifications Input Signals and verify with scope and or DVM that all signals are present Refer to Figure 3 KYZ outputs not Input to Integrator wrong Check analog output to verify positive functioning register not polarity or absent output or negative output for in watt or accumulating counts leading vars on bidirectional units rate indicators not flashing Defective Integrator Card Refer to Integrator Troubleshooting Analog output wrong Improper input wiring Refer to Figs 2 6 2 7 2 8 in polarity Instruction Manual No analog output or Defective multiplier card Refer to Multiplier troubleshooting incorrect output Defective transformer Substitute known good multiplier card assembly to verify If problem is in transformer as
28. nd CTs Do not remove or install any individual card with the auxiliary power applied Suggested Equipment 1 Digital Voltmeter 2 Oscilloscope 3 Extender Card Scientific Columbus Part B4021 4 JEM Series Joule Electronic Meters Instruction Manual Test Points There are five miniature test points on the power supply board which accommodate 0 080 inch diameter pin probes Table 2 lists the test points color and description 10 Table 2 Test point identification Orange gt 00 minimum to 14 30 maximum Violet circuit Ei e 504 kHz oscillator output Note The magnitude of the 14 Vdc supply should be within 200 mVdc of the 14 supply WARNING Always remove auxiliary power and input signals when inserting or removing subassemblies from the JEM1 meter WARNING Do not disconnect the auxiliary power with the potential and current applied to the PTs and CTs Do not remove or install any individual card with the auxiliary power applied Table 3 Power Supply Troubleshooting Guide SYMPTOM POSSIBLE CAUSE ACTION REQUIRED Power Supply not regulating 14 lt 13 75 No oscillator output Power Supply output at zero volts Cannot adjust 5 85 V reference to 5 8500 Vdc 3 0001 Excessive loading due to other subassemblies Version 001 Defective CD4007AE Version 002 Defective 4001B and or 4013B Transistors Q2 and or Q4 defective LM301A and or 1N827
29. oard is also the platform for optional mass memory and the optional internal modem Note Optional modem and mass memory are not available on the Revision A Controller Board Theory of Operation information is processed on the main controller board with the 80C451 microcontroller found in U1 Socket US houses the 48 02 nonvolatile clock calendar integrated circuit where all configuration and register information is stored For revision B or later sockets U4 and U6 accommodate the static random access memory U4 had volatile static RAM on Revision A The memory is nonvolatile if the mass memory option is present or volatile otherwise Load profile data are stored in these locations Note Schematic drawings Revision D and E are identical Revision E occurred because the assembly revision level changed with the inclusion of switchboard models See Figures 23 24 and 25 User Serviceable Components WARNING The first step is to de energize the meter and completely isolate it from all service lines Never dismantle an energized meter nonvolatile integrated circuits listed above contain embedded energy cells The chips should be replaced every ten years to assure data integrity The EXJ Controller must be reconfigured after integrated circuit replacement 43 Daughter Board 44 Board Description The EXJ Daughter Board is a separate board that plugs into socket 09 Theory of Operation The EX
30. r UART operation 5 9 9 0 Input Signals from Integrator Cards are determined by soldered in jumpers on the JEM back plane Intercon nect boards are listed in Table 4 2 Each transition results in a register count pr OV Figure 19 35 Four input signals are possible along with corresponding rate indicator signal for each Data is accumulated for each input signal and displayed with a function TEST POINT REFERENCE TEST POINT REFERENCE g h li 36 indicator as listed below and shown on Figure 18 INDICATOR FUNCTION PIN OF RATE INDICATOR INDICATOR CIRCUIT COMMON Battery clip may be used as reference point for measuring waveform or voltages Battery positive terminal nominal 3 Vdc 2 7 V minimum Data Retention Power decoupled from battery is supplied to the microprocessor pin 40 and RAM IC s pin 22 2 2 to 2 6 Vdc with auxiliary power off Pin 10 of input connector PS common Pin 11 of input connector 14 Vdc Pin 12 of input connector 14 TABLE 9 ELECTRONIC REGISTER TROUBLESHOOTING GUIDE SYMPTOMS No display Displays fixed data won t roll or count Displays counts but won t roll Displays undesired quantities time interval wrong counts off by ratio of 10 or 100 Incorrect or not functioning after auxiliary power removed and re applied POSSIBLE CAUSE Power not supplied to Register Faulty cable connection
31. rd naar che Eo etiain 57 EX Display Board Rev A ede entere eate 59 EX Display Board Bev B eH 61 EX Display Board Rev B zen eed 63 Communication Interface Board Rev 0 65 Communication Interface Board Rev 67 Communication Interface Board Multiaccess Rev 0 69 Communication Interface Board Switchbd Rev A 71 Rear View of BackPlane Board 76 Schematic and Assembly Drawing Cross Reference Chart 5 2 MAINTENANCE MANUAL FOR SERIES JOULE ELECTRONIC METERS SECTION 1 Overview Introduction Audience Related Manuals Additional Related Manuals The JEM Maintenance Manual provides the customer with basic testing and troubleshooting procedures needed to prevent and or correct minor problems encountered with the JEM Series The manual is written for use by meter shop and laboratory personnel involved with ordering receiving configuring testing and installing JEMIs A good knowledge of safe metering practices is needed Reference to the following manuals may be necessary JEM Series Joule Electronic Meters Instruction Manual YD 08787 001 N JEM Coed Coded Output for Electronic Display Demand Register Operating Instructions YD 08788 001 N For additional information see the manual s for your specific produc
32. replacement for all JEM 1 register types both mechanical and electronic and may be installed with essentially no modification to JEM Usually the only parts required are Register itself and a new faceplate for the JEM 1 enclosure In September of 1990 minor physical changes were made to the EXJ Register design to allow standard subassemblies to fit both switchboard and non switchboard models of the JEMI Optional features include an internal modem and a load profile data storage system To increase flexibility in field data reading the EXJ Register includes a liquid crystal display of two lines with eight characters each with built in backlighting The display provides both numeric and user defined textual data for any combination of JEM functions Display formats pulse divisors demand times and serial data parameters are all user programmable Section Organization This section begins with an introduction followed by a discussion of the compatibility of pre 1990 and post 1990 EXJ registers with the switchboard and non switchboard JEM1 models Then each board in the EXJ Register is discussed with information about the board description theory of operation and the user serviceable components The silk screen and schematic drawings for each board are grouped together in a separate section A board to drawing cross reference chart precedes the drawings EXJ Contents Your EXJ contains the following assembl
33. sembly return unit to factory Digital calibration not Tap selector and or Refer to Instruction Manual Section 4 3 correct calibration header incorrect Analog input incorrect Test Analog calibration Defective Integrator Substitute known good integrator and or troubleshoot integrator card SUBASSEMBLIES If a problem exists which is not one of the general meter symptoms and the problem cannot be isolated to one or more P C board it is recommended that the unit be returned to the factory for repair A verification can be made to check if a problem can be isolated to an individual board A known good board of the same type is inserted in place of the suspected defective board and the unit is then checked for proper operation WARNING PERFORMING THIS TYPE OF CIRCUIT BOARD SUBSTITUTION WILL AFFECT METER CALIBRATION The transformer assembly with the exception of a visual check of wiring and or cable connections should be left alone The following procedures can be followed to troubleshoot other subassemblies POWER SUPPLY Reference Part Numbers 14438 001 and 14438 002 INTRODUCTION Circuit Description see schematics in Section 5 The JEMI Power Supply is composed of three sections a discrete linear regulator with current limiting a precision 5 85 Vdc reference and a 504 kHz crystal based time reference Theory of Operation The discrete linear regulator employs TIP29C and TIP30C transistors as series pa
34. ss elements A LM747 operational amplifier uses Kelvin sense feedback to control the pass transistors thus maintaining 14 at the output 2N3904 and 2N3906 transistors provide current limiting for the pass transistors A precision 5 85 Vdc reference voltage for the JEMI meter is generated from a precision 6 2 V zener diode The diode is biased for zero temperature coefficients The reference is buffered by a frequency compensated LM301 operational amplifier configured as a voltage follower A potentiometer accessible from the front of the meter provides adjustment of the voltage reference and the amplitude of the 14 outputs The 504 kHz crystal based time reference is produced in one of two ways On version 14438 001 of the board a 504 kHz crystal and a CD4007AE are used in a Pierce oscillator configuration On version 14438 002 2 016 MHz crystal and 40018 are used in a Pierce oscillator configuration to produce 2 016 MHz output A 4013B divides this output by four to obtain the desired 504 kHz Either version may be used in the JEMI Related Documents Maintenance Manual for JEMO Series Joule Electronic Meter Instruction Manual Rev C May 1990 YF 09175 001 N TROUBLESHOOTING WARNING Always remove auxiliary power and input signals when inserting or removing subassemblies from the JEM1 meter WARNING Do not disconnect the auxiliary power with the potential and current applied to the PTs a
35. t An Additional Related Manuals list is included at the end of this section JEM Series Joule Electronic Meters Instruction Manual YD 08787 001 N Jem Coed Coded Output for Electronic Display Demand Register Operating Instructions Y D 08788 001 N JEM Series Joule Electronic Meters With Quadrant Detector Instruction Manual YD 08837 001 N JEM Series Joule Electronic Meters With Slow Pulse Rate Meter Option for 2 2 1 2 and 3 Elements Instruction Manual YD 08838 001 N JEM Series Joule Electronic Meters Totalizer Model 6366 Instruction Manual YD 08911 001 N Series Electronic Meters With Addendum for Bidirectional Watthour With Line Loss Compensation Instruction Manual YD 09409 001 N JEM Series With Addendum For Bidirectional Watthour With Line Loss Compensation Maintenance Manual YD 09412 001 N EXJ Register User s Guide Supplement to JEM 1 User s Manual YD 09480 001 N EXJ II Register Retrofit Guide YD 09492 001 N EXJ Set Manual for EXJ II Register Preliminary YD 09493 001 N EXJ IT M Register User s Guide Supplement to JEM 1 User s Manual Revision C YD 09494 001 N Replacement of battery JEM Electronic Registers Instructions Y T 09461 001 N Replacement of JEM Electronic Register in the Field Instructions YT 09462 001 N Field Changing PROM in the Electronic Demand Register of the JEM Meter Instructions Y T 09463 001 N SECTION 2 PRECAUTIONS WARNING ALWAYS REMO
36. to a unit Jumper Area Function Area 1 Jumpers Area 2 Jumpers Area 3 Jumpers Area 4 Jumpers Var Q Area Connect watthour output function from card position 6 to register load rate indicator LED Connect watthour output function from card position 6 to register counter Connect varhour output function from card position 1 to register load rate indicator LED Connect varhour output function from card position 1 to register counter Connect potential inputs to card position 2 in correct phase for proper operation of Var or Q function multiplier Typical Block Diagrams included on the following pages to illustrate how circuit cards are interconnected to form various model number options Model 303 533 603 643 Function kWh kQh kWh Vh kWh kVARh kWh V2h 5 2 ES N E lt 5 lt t u OQ e 9 m O AN 000000100000 3 O 2 2 ii 0 E n ep n a ge 3 7 ALS VE SEES Rear View of Back Plane Board with Cover Removed Dashed Lines Indicate Circuitry on Back Side of Board Figure 34 43 TABLE 10 JEM JUMPER SELECTION CHART Reference Figure 34 Lo NO FUNCTION JUMPERS JUMPERS JUMPERS JUMPERS JUMPERS 102 390 ha j b mow kVARh fia ha b bh b fh j j j b y 12109
37. tomer 5 If the insertion process will require only a short period of time the insertion can be performed on a sheet of metal Grounds are unnecessary Step Procedure 1 Follow the handling and insertion pre cautions carefully 2 Any soldering iron used must first be grounded SECTION 3 TROUBLESHOOTING AND TESTING Introduction Purpose Comment Equipment Related Pages METER SYMPTOMS Introduction Comment This section gives detailed troubleshooting and testing procedures both for the meter in general and for individual subassemblies The purpose of this section is to determine if the JEM meter is functioning properly and if not to verify if the meter can be repaired in the field or if the unit must be returned to the factory for repair Careful reading of the Instruction Manual is a prerequisite to troubleshooting and testing a JEM meter Basic equipment needed is listed below Digital Voltmeter Oscilloscope Extender card Part 04021 001K JEM Series Joule Electronic Meters Instruction Manual Extender Cable for Electronic Register Meter Symptoms Table 1 Power Supply Table 3 Common meter symptoms possible causes and actions required to correct these problems are listed in this section A careful visual inspection is often the most useful aid in troubleshooting For example loose screws broken wires at terminal blocks cards not fully inserted in edge connectors broken co
38. uit or the counter mechanism ACTION REQUIRED Verify cable is properly inserted and that retainer is in place Verify divider operation by observing input and output of divider stages at test points a b and c Replace divider IC 6 as required Figure 16 17 will aid in determining defective part Check counter mechanism for possible misalignment of digits ELECTRONIC REGISTER This section contains the following Figure 18 Electronic Register Calibration Component and Test Point Location Figure 19 Waveforms and Test Point Descriptions Table 9 Troubleshooting Guide 33 Register Connector for Input Serial Interface Connector COED Option Address Switch Function Programming Switch Microprocessor Input Data Initialize Contacts Display Pd Control Front panel ee Controls Interconnect Used Only with COED Option UART Board Data Display F10 F11 F12 Electronic Register Calibration Component and Test Point Location Figure 18 34 ELECTRONIC REGISTER Waveforms and Test Point Descriptions Test Point Reference Line Sync Signal Generated at IC 11 Pin 10 applied to clear input of 1802 Pin 3 d 0 16 67 ms 2 ms b MicroProcessor Clock Applied to IC 3 Pin 3 approximately 2 mHz on non COED units COED ASCII units have crystal trolled 2 4576 mHz clock which is divided to 9600 Hz for signal fo
39. ve Multiplier card recheck Integration waveform can be monitored at green test point a Maximum slew rate at 0 Load 10 mV Sec Check per calibration tables Section 4 of Instruction Manual VA MULTIPLIER This section contains the following Figure 12 Calibration Component and Test Point Location Figure 13 VA Waveforms Table 6 VA Multiplier Troubleshooting Guide ANALOG OUTPUT El LINEARITY ADJ R45 100K 100K R49 2s ZERO CALL b R77 UNEARITY 1K ADJ R57 ADJ T ADU Calibration Component and Test Point Location Only components shown are for location of test points See assembly drawing 05701 001 for complete details Figure 12 Calibration Component and Test Point Location 23 VS VA pubis peuonbs 14 zz pubis pubis Juan snoeubjubjsuj pubis pejonbs 4 y et 2 401991eg 6088013 0487 nduj 20 9 O O IVAOZ lO A9 e O 33U3J3j9y AS jutog 159 Figure 13 VA Waveforms 24 TABLE 6 VA MULTIPLIER TROUBLESHOOTING GUIDE SYMPTOMS No output or output does not vary with load Waveform a okay b incorrect Waveforms a and b okay c incorrect Waveforms a b c okay d incorrect POSSIBLE CAUSE Defective circu
40. y modules Controller Board Assembly Daughter Board Assembly only on EXJ Controller Board Revision A Display Assembly Consists of two parts Display Board Liquid Crystal Display module Display interconnect cable assembly as required One of the following boards will be included depending on model switchboard or non switchboard and options of your JEMI Communication Interface Board PCB part number 13269 002K for A base and S base models Multiaccess Communication Interface Board 13397 001K for A base and S base models Communications Interface Board PCB part number 13535 001K for switchboard models Ground Plane Board One of the following Part number 12711 001 for non switchboard models Part number 13658 002 for switchboard models Related Manuals Reference to the following JEM manuals may be necessary JEM Series Joule Electronic Meters Instruction Manual YD 08787 001 N JEM Coed Coded Output for Electronic Display Demand Register Operating Instructions YD 08788 001 N For additional information see the manual s for your specific product 39 REGISTER COMPATIBILITY EXJ Registers built prior to the introduction of the JEMI switchboard meter late in 1990 had an interconnection between the Controller board assembly and the Display assembly comprised of a direct pluggable right angle header and socket See Figure 20 DISPLAY ASSEMBLY THRU PANEL SOCKET RIGHT AN
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