SERVICE MANUAL KEPCO®
Contents
1. Power Module Mechanical Outline 2 1 6 1 3 The TMA 4882 27 Controller And MAT Power Modules sss eene 1 8 2 1 Front View Of The 1 3 Rack MAT Power nens 2 3 2 2 Rear View Of The 1 3 Rack Power 2 4 2 3 MAT Module Barrier Strip With Jumpers For 115 230 2 6 2 4 Variation Of Output Impedance With Frequency For A Voltage Source And A Current Source 2 8 2 5 Load Connections Local 2 6 Load Connections Remote Sensing 3 1 Two MAT 1 3 RACK Power Modules Connected In Series Via Their Output Connector 3 2 3 2 MATPower Module Control Section Top Cover Removed sse nnns 3 3 3 3 Tree Diagram of SCPI Commands Used with MAT Power Supplies 3 6 3 4 Typical Example Of MAT Power Supply Program Using SCPI 3 7 3 5 Schematic Diagram MAT Front Panel Display Board 8 3 13 A 1 Function A 1 2 INX Initiate Op Code A 2 37 FTA ree pei CD dins A 2 4 Hm A 3 5 OPN CLS Open Close Relay Comm2. 3 J4 J5 MAT 55 7 J1 J2 J4 J3 J5 MAT 75 5 A1 J1 J2 5 J3 J4 MAT 100 3 6 J1 J2 J3 J5 MAT 150 2 4 J7 Enables crowbar protection circuit to trip circuit breaker and shut off unit if path fault detected Path Fault Allows software complete control of path fault pro Protection J7 tection Outputs voltage and current are pro Default grammed to zero and relays opened to isolate load in case of path fault Enables crowbar protection circuit to trip circuit J5 breaker and shut off unit when power loss Input Power Default detected A2 Loss Protec tion Disables crowbar protection circuit which trips cir J5 cuit breaker and shuts off unit when power loss detected 2 9 PRELIMINARY CHECK OUT For a preliminary electrical check out of the MAT Power Module a Host Computer a Power Module Controller see PAR 1 2 and all the necessary interconnection cables are required Connect the MAT Power Module DC Output connector for local sensing Output 1 to Sense 1 Output 2 to Sense 2 see Table 2 4 Connect a resistive load across Output 1 and Output 2 that is capable of dissipating the maximum current and voltage capabilities of the Power Module In this procedure the MAT Power Module Control Bus address is 3 it is set at the factory to 3 Connect the Kepco Power Module Controller and the MAT Power Module following check out uses a Power Module Model MAT 36 10 as an example to the Control Bus Connect the Host Compu
3. For parallel operation it is recommended that the user seek the manufacturer s assis tance for specific applications POWER MODULE CONTROLLER MAT TIME DELAYS TO OBTAIN A VALID STA TUS After sending a command that might affect the output of the Power Modules or their relays it is recommended that the Status command be sent For information on this command see the Power Module Controller Operator s Manuals The required time delay before a valid status of the TMA MAT system is as follows After an Open Close Change of Polarity or Change of Mode wait approximately 300 milliseconds After a Confidence Test command or an Internal Self Test wait approximately 400 milli seconds After a Reset command wait approximately 300 milliseconds After an INX Command the maximum delay time is 2 seconds MAT 1 3 RACK 112404 3 1 3 4 3 5 3 2 POWER TERMINAL 2B FIGURE 3 1 TWO MAT 1 3 RACK POWER MODULES CONNECTED IN SERIES VIA THEIR OUTPUT CONNECTOR POWER LOSS CIRCUIT An Automatic Shutdown option is available when a Power Loss is detected Dependent on the setting of jumper J5 on the A2 Sense and Polarity Relay Board the Power Module will shutdown automatically or remain in operation see Figure 3 2 If the jumper is in place the AC Input Power circuit breaker will trip if the jumper is removed the circuit breaker will not trip The MAT Power Module is supplie
4. 1 INTRODUCTION 1 1 SCOPE OF MANUAL This manual contains instructions for the installation operation and maintenance of the 1 3 Rack size 360W MAT series of voltage and current stabilized DC Power Modules manufactured by Kepco Inc Flushing New York U S A 1 2 GENERAL DESCRIPTION The Kepco MAT Power Module with overvoltage overcurrent overtemperature polarity rever sal and power loss protection is a digitally controlled precision stabilized Power Module that delivers either stabilized voltage or current A single front panel meter with a selector switch constantly monitors the output voltage or the output current The prevailing operating mode is indicated by LED mode indicators on the front panel Operating mode crossover is dependent on commands from a Host Computer The Power Module has a linear and fully dissipative NPN pass transistor driven by high gain integrated circuit amplifiers The output of the Power Module is fully programmable The Power Module features full range output control by means of a compatible Kepco Power Module Controller Control of the MAT Power Module is via the IEEE 1118 2 wire serial bus operating at 375KHz as many as 27 separate modules of either the MAT MST MBT or BOP Series design can be addressed via the bus see Figure 1 1 Decoders for RS232 IEEE 488 and VXI are available in modular form and stand alone types As shown in Figure 1 1 the fol lowing controllers are available to control of MAT P
5. 3 THE TMA 4882 27 CONTROLLER AND POWER MODULES SAFETY There are no operator serviceable parts inside the case Service must be referred to authorized personnel Using the power supply in a manner not specified by Kepco Inc may impair the pro tection provided by the power supply Observe all safety precautions noted throughout this man ual Table 1 3 lists symbols used on the power supply or in this manual where applicable TABLE 1 3 SAFETY SYMBOLS SYMBOL Meaning CAUTION RISK OF ELECTRIC SHOCK 1 CAUTION REFER TO REFERENCED PROCEDURE INDICATES THE POSSIBILITY OF BODILY INJURY WARNING OR DEATH INDICATES THE POSSIBILITY OF EQUIPMENT CAUTION DAMAGE MAT 1 3 RACK 112404 2 1 2 2 SECTION 2 INSTALLATION UNPACKING AND INSPECTION This instrument has been thoroughly inspected and tested prior to packing and is ready for operation After careful unpacking inspect for shipping damage before attempting to operate Perform the preliminary operational check as outlined in PAR 2 9 If any indication of damage is found file an immediate claim with the responsible transport service The MAT 1 3 rack module may be received in either of two ways with a special transport cover or in a RA 50 RA 51 housing Below are the procedures necessary to remove the MAT power module from its housing or transport cover a Forthe MAT 1 3 rack power module in a transport cover there are ten screws s
6. a catastrophic error condition exists in which case an error message will be returned If the time out value returned is not zero this indicates the power supply s output voltage or current has not yet settled A time delay should be observed before proceeding with the FTH command or the command may be repeated until a zero value is returned but the preceding FTH command must also be repeated INX VOLT Power supply initiates voltage reading FTH VOLT Power supply sends voltage reading to controller FIGURE A 2 INX Initiate Op Code Command FTH FTH VOLT fetch voltage reading FTH CURR fetch current reading Commands the previously designated power supply to return the requested data reading This command must immediately follow an INX command The value returned is the value of the out put voltage or current whichever was requested unless a catastrophic error condition exists in which case an error message will be returned The value observed will be in scientific notation INX VOLT Power supply initiates voltage reading FTH VOLT Power supply sends voltage reading to controller FIGURE A 3 FTH Fetch Command MATSVC 112404 Syntax Function Description Example MATSVC 112404 SET SRX SRN FNC DCS CHnn SET VOLT lt value gt CURL lt value gt FNC DCS CHnn SET CURR lt value gt VLTL lt value gt SRX Set Range Maximum SRN Set Range Minimum This operator is used in conjunction with FNC in st
7. adjust output current of power supply to initial value CONDITIONS current mode shunt at the output A1R20 Eo zero NOTE 1 Used to adjust output voltage of power supply to zero CONDITIONS voltage mode no load A1R15 I CURRENT SENSING ZERO NOTE 1 Used to adjust current monitor amplifier to zero CONDITIONS voltage mode no load A1R16 FULL SCALE CURRENT ADJUST Used to calibrate the full scale value of the output current NOTE 1 CONDITIONS current mode shunt at the output A1R11 1 Used to calibrate full scale voltage CONDITIONS voltage mode no load A1R12 1 Used to adjust internal full scale current CONDITIONS current mode shunt at the output 51 Node Address Used to select Node address node number or channel number of the MAT Power Supply from 1 31 A1TP1 Test Points Provides four test points used for testing calibration 1 CURRENT REFERENCE 2 CURRENT MONITOR 3 VOLTAGE REFERENCE 4 COMMON NOTES 1 These adjustments must be done in accordance with the calibration procedure see PAR 5 5 2 2 MAT 1 3 RACK 112404 1 2 3 4 X POWER SU S NS o SV MODE 4 OUTP LE CURREN ENABLED REVERSED SUO FIGURE 2 1 FRONT VIEW OF THE 1 3 RACK MAT POWER SUPPLY TABLE 2 3 FRONT CONTROL MAT POWER MODULE CONTROL FUNCTION SERVES AS AN AC POWER SWITCH AND
8. are included here for compatibility with other equipment programmed with CIIL commands The CIIL command set for the MAT Power Supply is defined and explained in Appendix C CIIL is the test instrumentation module programming language standard for all new Air Force MATE test equipment programs CIIL is a subset of a higher level language used in automatic test equipment systems ATLAS Abbreviated Test Language for All Systems The CIIL statements sent to monitor and program Power Modules consist of CIIL operation codes nouns and noun modifiers with data values expressed as ASCII integer decimal or in scientific notation EXAMPLES USING CIIL TO PROGRAM THE MAT POWER MODULE The following examples show the use of CIIL Control Interface Intermediate Language They do not show the IEEE 488 bus commands from the Host Computer to the Power Module Con troller nor do they show the proper time delays refer to PAR 3 3 The examples are for a MAT 55 7 model with Control Bus address 9 The ASCII characters for space carriage return and line feed are represented as sp cr and If respectively The MAT Power Module the Power Module Controller a Host Computer and the IEEE 488 must be interconnected for this routine Note sure the sense leads are connected to their respective load leads When output current is programmed a load must be connected at the output terminals 1 To verify the Power Module is operational the Host Comput
9. are used for ac input two for control bus connections see Table 2 5 The power module controller and up to 27 MAT power modules can be connected daisy chained to the control bus see PAR 1 2 2 4 TABLE 2 5 AC INPUT CONTROL BUS CONNECTOR PIN DESIGNATIONS CONNECTOR PIN See Figure 2 2 FUNCTION 1 SAFETY GROUND 2 3 NEUTRAL 4 NOT USED 5 CONTROL BUS IEEE 1118 BUS LINE 6 CONTROL BUS IEEE 1118 BUS LINE MAT 1 3 RACK 112404 2 4 TABLE 2 6 DC OUTPUT CONNECTOR PIN DESIGNATIONS CONNECTOR PIN See Figure 2 2 FUNCTION H CONNECTED TO OUTPUT TERMINAL 1 I CONNECTED TO OUTPUT TERMINAL 2 A CONNECTED TO SENSE TERMINAL 1 E CONNECTED TO SENSE TERMINAL 2 D CONNECTED TO SAFETY GROUND AC INPUT REQUIREMENT These Power Modules operate on a single phase 115 Va c nominal line The Power Module can also be connected to 230 Va c by the following procedure 1 Disconnect the AC Input power from the RA 50 or RA 51 rack adapter Turn OFF the circuit breaker on the module if operating Remove the MAT Power Module from the RA 50 or RA 51 Rack Adapter by loosening two slotted captive screws at the top of the MAT front panel then locate the barrier terminal block mounted on the chassis NOTE Do not move the wires connected to the barrier strip they are properly placed for both 5 6 115 Va c and 230 Va c
10. is used with either the SET command to program a power supply s output stimulus mode or with the VOLT and CURR commands to read its output settings sensor mode Description The first operand contains the three 3 letter mnemonic pertaining to the device on the control bus in this case DCS Direct Current Source If a reading is being set up the modifier VOLT or CURR fol lows The next operand is used to select the specific channel of the device being programmed or read from The MAT can control up to 27 power supplies power modules with control bus addresses in the range of 1 to 31 Example FNC DCS CH12 SET VOLT 15 Power supply at node address 12 commanded to 15V FNC DCS CH12 SET CURR 3 Power supply at node address 12 commanded to 3A FNC DCS VOLT CH03 Power supply at node address 3 returns value which represents actual output voltage FNC DCS CURR CH21 Power supply at node address 21 returns value which represents actual output current NOTE Actual output voltage and current depends on whether output is enabled or disabled and load conditions FIGURE A 1 FNC Function Command MATSVC 112404 A 1 Syntax Function Description Example Syntax Function Description Example INX INX VOLT initiate voltage reading INX CURR initiate current reading Commences a data acquisition process in accordance with the preceding FNC command The response to the INX command is a dynamic time out value unless
11. ree AL Ee E e ET Vr nn alias 2 1 2 3 H 2 2 2 4 AC Input Requirement crecieron rer endete O aS esas 2 5 2 5 oett ici Ue i pedo ee pase eee 2 6 2 6 Installation eee ER Ree dedi e 2 6 2 7 GOUGING ga ikon AT CIA 2 7 2 7 1 Safety GrounGing E M 2 7 2 7 2 DG Output Groundlirig 2 Ir ore OH OPEM RES 2 8 2 7 3 Power Module To Load aaa enne 2 8 2 7 4 Load Connection Local Error 0 aaa aaa enne 2 9 2 7 5 Load Connection With Remote Error nennen 2 10 2 8 Operating Configuration 5 3 5 A AAAA en el en ee 2 10 2 9 Preliminary Check Out sce oc sabes a e eea 2 11 2 9 1 Example 1 Full Scale Voltage Check 2 dozowania 2 12 2 9 2 Example 2 F l Scale Current Check redo ten O 2 13 2 9 3 Example 3 To Reset the Power 20 000220 20000 2202 near entere naciek w 2 14 SECTION 3 OPERATION 3 1 A A eA AO O ee ee ee 3 1 3 2 Series Connection Of MAT Power 3 1 3 3 Power Module Controller MAT Time De
12. voltages is provided There are no operator serviceable parts or adjustments within the product enclosure Refer all servicing to trained service technician Source power must be removed from the product prior to performing any servicing This product is factory wired for the nominal a c mains voltage indicated on the rat ing nameplate located adjacent to the source power connection on the product s rear panel To reconfigure the product input for other nominal mains voltages as listed herein the product must be modified by a trained service technician gt gt gt 2 Grounding This product is a Class 1 device which utilizes protective earthing to ensure operator safety The PROTECTIVE EARTHING CONDUCTOR TERMINAL must be properly con nected prior to application of source power to the product see instructions on instal lation herein in order to ensure safety from electric shock PROTECTIVE EARTHING CONDUCTOR TERMINAL This symbol indicates the point on the product to which the protective earthing conductor must be attached EARTH GROUND TERMINAL This symbol is used to indicate a point which is connected to the PROTECTIVE EARTHING TERMINAL The component installer assembler must ensure that this point is connected to the PROTECTIVE EARTH ING TERMINAL CHASSIS TERMINAL This symbol indicates frame chassis connection which is supplied as a point of convenience for performance purposes see instructions on grounding her
13. 0 0 7 1050 MAT 1 3 RACK 112404 1 5 NES 1 304 33 122 0 780 19 812 O 0 090 2 286 4 750 120 650 ms ng mec 132 537 NOTES 1 MATERIA i EW 2 A CHASSIS 0 06 THICK COLD ROLLED STEEL ik B COVER THE COVER IS USED ONLY FOR TRANSPORT 5 PURPOSES IT IS HELD IN PLACE WITH EIGHT SCREWS C FRONT PANEL 0 09 THICK ALUMINUM 6061 T6 5 375 ih 2 136 525 M E Lu ms A CHASSIS CADMIUM PLATED 0 0005 WITH A CHROMATE i t e 5 WASH IRIDESCENT YELLOW 87 B FRONT PANEL KEPCO GRAY HARTIN PAINT No 15 22493 2 3 DIMENSIONS IN PARENTHESIS ARE IN MILLIMETERS LMODEL NAMEPLATE owa 2 A BETWEEN MOUNTING HOLES 21 64 70 4 B ALL OTHER DIMENSIONS 91 32 70 8 EXCEPT AS NOTED 3010033 FIGURE 1 2 MAT POWER MODULE MECHANICAL OUTLINE DRAWING 1 6 MAT 1 3 RACK 112404 1 5 MISCELLANEOUS FEATURES a Mode flag A pair of panel LED indicators indicate whether the Power Module is in voltage mode or in current mode b Remote error sensing Separate voltage sensing terminals permit 4 wire connections to a load to compensate for static load effects up to 0 5V per lead An additional 1 volt output voltage beyond the nominal voltage rating of each MAT Power Module is provided for this purpose c Storage temperature ra
14. 0 1 0 3 0 0 0 1 1 4 0 0 1 0 0 5 0 0 1 0 1 6 0 0 1 1 0 7 0 0 1 1 1 8 0 1 0 0 0 9 0 1 0 0 1 10 0 1 0 1 0 11 0 1 0 1 1 12 0 1 1 0 0 13 0 1 1 0 1 14 0 1 1 1 0 15 0 1 1 1 1 16 1 0 0 0 0 17 1 0 0 0 1 18 1 0 0 1 0 19 1 0 0 1 1 20 1 0 1 0 0 21 1 0 1 0 1 22 1 0 1 1 0 23 1 0 1 1 1 24 1 0 0 0 0 25 1 11 0 0 1 26 1 1 0 1 0 27 1 1 0 1 1 28 1 1 1 0 0 29 1 1 1 0 1 30 1 1 1 1 0 31 1 1 1 1 1 3 5 1 MAT POWER MODULE CONTROLLER SYSTEM 3 4 MAT Power Modules are digitally controlled power supplies Up to twenty seven Power Modules at a maximum distance of 1000 feet 300 meters can be controlled by the Power Module Con troller see PAR 1 2 The Power Module Controller communicates as a Talker Listener with a Host Computer over the IEEE 488 GPIB using either the Standard Commands For Program MAT 1 3 RACK 112404 3 5 2 mable Instruments SCPI or the Control Interface Intermediate Language CIIL Refer to the Power Module Controller Operator s Manual for details regarding SCPI and CIIL commands Communications with the MAT Power Modules are accomplished via a two wire high speed 375 KHz bidirectional serial communications bus called the Control Bus The Power Module Controller is designed with a microcomputer board containing a relatively powerful CPU 256K of RAM programmable timers priority interrupt circuits an RS 232 input output interface port and ROM firmware embedded software A discrete fault line is designed into the Powe
15. 12404 Proceed further to slide the Module in by lifting the handle upward When the Module is half way inserted at the begining of the transformer remove the hand from the bottom of the unit At this point of the insertion process ensure that the Bit Bus twisted pair of white wires on the right side of the Power Transformer as viewed when looking down over the front panel towards the back of the unit does not get caught by the right edge of the Rack Adapter As the Power Module is inserted inside the Rack Adapter completely a slight resistance will be felt when the Module connectors engage the mating connectors of the Rack Adapter Continue to apply steady but firmer pressure to overcome the insertion force of the various connectors If the module cannot be inserted fully using this type of force remove the Power Module and inspect the rear panel and Rack Adapter for obstruction or damage If the damage cannot be isolated return both the Power Module and Rack Adapter to Kepco along with a complete description of the problems encountered when installed in a Rack Adapter that is in a Rack the Rack Adapter must be securely fastened to the Rack before the Power Module is installed to avoid structural damage to the Rack Adapter when being installed into the Rack Adapter must be supported not only at the front of the assembly at the handle by one hand but also at or near the center of gravity of the chassis underneath the assembly near t
16. AND VOLTAGE LIMIT 1 To program the MAT Power Module MAT 55 7 in current mode with a current of 4 amps and a voltage limit of 30 volts the Host Computer sends FNC DCS CH9 SET CURR 4 SET VLTL 30 cr 1f The MAT at address 9 is then set up as a current source giving 4 amps with a voltage limit of 30 volts 2 To verify the previous command was implemented the Host Computer sends STA cr 1f The Power Module Controller sends back if no errors occur sp cr 1 MAT 1 3 RACK 112404 3 11 3 To enable the output the Host Computer sends CLS CH9 cr 4 To verify the previous command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 5 To measure the current at the output the Host Computer sends FNC DCS CURR CH9 cr The MAT at address 9 is now set to take a reading 6 To take a reading the Host Computer sends INX CURR cr 1f a The MAT previously set up now starts to measure and sends the proper time delay needed for the measurement See Par 3 3 b The Power Module Controller will send the time delay back to the Host Computer when it has been Talk Addressed see specific IEEE 488 interface requirements 00 cr 1f 7 The Host Computer then sends FTH CURR cr a The MAT then sends the measured in the example it is 3 9998 volts current in scien tific notation to the Power Module Controller b
17. KPL Kepco Programming Language is used to facili tate input output operations for the TMA PC 27 It has embedded in it the software that sup ports the TMA PC 27 and is also compatible with National Instruments NI 488 DOS Handler for the IEEE 488 GPIB MAT 1 3 RACK 112404 3 5 3 6 REMOTE PROGRAMMING 3 6 1 GENERAL Kepco MAT Power Supplies are programmed over a control bus using either SCPI Standard Commands for Programmable Instruments or CIIL Control Interface Intermediate Language commands SCPI and CIIL provide a common language conforming to IEEE488 2 for instru ments used in an automatic test system The control bus can be either the IEEE 488 standard communication bus General Purpose Interface Bus GPIB or the RS232C communication bus Remote programming of the MAT requires connection to one of the controllers specified in PAR 1 2 3 6 2 SCPI PROGRAMMING SCPI Standard Commands for Programmable Instruments is a programming language con forming to the protocols and standards established by IEEE 488 2 reference document ANSI IEEE Std 488 2 IEEE Standard Codes ForMATs Protocols and Common Commands SCPI com mands are sent to the MAT Power Supply as output strings within the selected programming language PASCAL BASIC etc in accordance with the manufacturer s requirements for the particular GPIB interface card used and the Kepco controller selected see PAR 1 2 Figure 3 3 illustrates typical commands use
18. OR SETTING THE DECIMAL POINT OF THE PANE METER USE JS FOR CURRENT AND J6 FOR VOLTAGE DECIMAL POINT OR J7 FOR BOTH CURRENT AND VOLT E JUMPER ON JS AND J6 OR J7 O SELECT A SINGLE DECIMAL NO DECIMAL POINT IS THE DECIMAL POINT BEFORE THE LAST DIG AND DPS IS ICATED AFTER FIRST DIGIT 6 USE TWO JUMPERS ON J1_1 AND J2_2 FOR POSITIVE SIGNAL POSITIVE POLARITY ON THE PANEL METER OR UN Ji_ AND J2_1 FOR NEGATIVE SIGNAL POSITIVE POLARITY ON THE PANEL METER TO PANEL METER US GIO 0 x PROPRIETARY DATA 1997 KEPCO INC FIGURE 3 5 SCHEMATIC DIAGRAM MAT FRONT PANEL DISPLAY BOARD A8 6 39 6 40 Blank APPENDIX A COMMAND DEFINITIONS A 1 INTRODUCTION This appendix defines the CIIL commands used with the MAT Power Supply Table C 1 provides a quick reference of all CIIL commands used in the MAT Power Supply TABLE 1 CIIL SUBSYSTEM COMMAND QUERY INDEX COMMAND PAGE COMMAND PAGE CLS CA OPN CA CNF CA RST CA FNC C 1 SET C 3 FTH C 2 SRN 3 INX C 2 SRX 3 IST CA STA C 5 FNC Syntax Stimulus mode FNC DCS CHnn SET Command Sensor mode FNC DCS VOLT or CURR command CHnn Function This operator
19. POWER MODULE TO LOAD INTERFACE The general function of a voltage or current stabilized Power Module is to deliver rated output to the load The load may be fixed or variable resistive capacitive or inductive and may be located close to or far away from the Power Module The Power Module is designed for varied applications The aim of the following paragraphs is to instruct the user in the interface of the Power Module to the load The perfect interface between a Power Module and load insures optimum performance To approach this state of operation one must be familiar with certain requirements such as inter connection guidelines Ohm s Law and ac theory Load Wire Selection A stabilized dc Power Module is not an ideal voltage or current source with zero output impedance voltage mode or infinite output impedance current mode All volt age sources have some amount of impedance which increases with frequency and all current sources have impedance which decreases with frequency See FIG 2 4 DECREASING DUE TO OU FIGURE 2 4 VARIATION OF OUTPUT IMPEDANCE WITH FREQUENCY FOR A VOLTAGE SOURCE AND A 2 8 CURRENT SOURCE MAT 1 3 RACK 112404 A practical model for a voltage stabilized Power Module includes a series inductance represent ing dc and low frequency source impedance Load leads should have minimum voltage drops error sensing is discussed below and minimum inductance error sensing does not compen sate f
20. RRENT CHECK Program the Power Module MAT 36 10 to full scale current and check that the front panel meter and internal measured values are the same To program the Power Module to 10 amps with a voltage limit of 36 volts the Host Com puter sends FNC DCS CH3 SET CURR 10 SET VLTL 36 cr The MAT at address 3 is now set to 10 amps with a voltage limit of 36 volts To verify the FNC command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 To measure the current at the output the Host Computer sends FNC DCS CURR CH3 cr 1f The MAT at address 3 is now set to take a reading To take a reading the Host Computer sends INX CURR cr 1f a The MAT previously set up now starts to measure and send the proper time delay needed for the measurement b The Power Module Controller will send the time delay value back to the Host Com puter when it has been properly Talk Addressed see specific IEEE 488 interface requirements 00 cr If The Host Computer then sends FTH CURR cr 1f MAT 1 3 RACK 112404 2 13 a The MAT then sends the measured current in scientific notation to the Power Module Controller for example 9 9998 amps which b The Power Module Controller in turn sends 9 9998E0 cr 1 6 Check that the front panel meter reading and the computer are identical within their mea surement tolerance The meter selection switch m
21. SERVICE MANUAL MAT 1 3 RACK EXCEPT 6 32 POWER SUPPLY MODEL AM MAT 1 3 RACK EXCEPT 6 32 POWER SUPPLY ORDER NO REV NO This on line version of the Technical Manual includes only Installation and Operating Instructions For the complete manual please contact Kepco THE POWER SUPPLIER 2004 KEPCO INC 243 WG KEPCO INC 131 38 SANFORD AVENUE FLUSHING NY 11352 U S A e TEL 718 461 7000 e FAX 718 767 1102 email hg kepcopower com World Wide Web http www kepcopower com Declaration of Conformity Application of Council directives 73 23 EEC LVD 93 68 EEC CE mark Standard to which Conformity is declared EN61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 Manufacturer s Name and Address KEPCO INC 131 38 SANFORD AVENUE FLUSHING N Y 11352 USA Importer s Name and Address Type of Equipment Component Power Supply Model No PRODUCT MODEL NUMBER Year of Manufacture I the undersigned declare that the product specified above when used in conjunction with the condi tions of conformance set forth in the product instruction manual complies with the requirements of the Low Voltage Directive 73 23 EEC which forms the basis for application of the CE Mark to this product Place KEPCO Inc 131 38 Sanford Ave Flushing N Y 11352 USA Saul Kupferber Fu
22. TURNS THE AC POWER LINE OFF ON OVER 1 Be EOE BREAKER VOLTAGE OVERCURRENT TURE OR POWER LOSS 2 VOLTAGE MODE INDICATOR GREEN LED ENERGIZED IN VOLTAGE MODE 3 CURRENT MODE INDICATOR YELLOW LED ENERGIZED IN CURRENT MODE 4 VOLTAGE CURRENT METER WITH SELECTION ENERGIZES TO READ OUTPUT VOLTAGE SWITCH GREEN LED YELLOW LED ENERGIZES TO READ OUTPUT CURRENT ENERGIZED WHEN RELAY CLOSES AND 5 OUTPUT ENABLED INDICATOR GREEN LED VOLTAGE IS PRESENT AT THE POWER MOD ULE OUTPUT TERMINALS ENERGIZED WHEN RELAY CLOSES AND 6 POLARITY REVERSED INDICATOR GREEN LED POLARITY AT POWER MODULE OUTPUT TERMINALS IS REVERSED MAT 1 3 RACK 112404 2 3 N T Elu 0D 1 FIGURE 2 2 REAR VIEW OF THE 1 3 RACK POWER MODULE TABLE 2 4 REAR TERMINATIONS MAT POWER MODULE ITEM NO See Fig 2 2 REAR TERMINATION FUNCTION DC OUTPUT CONNECTOR Connects the MAT power module output lines sensing lines and ground line to the load See Table 2 6 for pin designations Type MS3102A16 10P mating connector MS3108A16 10S KEPCO P N 143 0331 supplied AC INPUT POWER CONTROL BUS CONNECTOR Connects MAT power module to a c input power source and Bitbus controller via RA 50 or RA 51 rack adapter Five pins
23. The Power Module Controller in turn sends 3 9998E0 cr 1 8 To measure the voltage at the output the Host Computer sends FNC DCS VOLT CH9 cr The MAT at address 9 is now set to take a reading 3 12 MAT1 3 RACK 112404 112404 PROPRIETARY DATA 1997 KEPCO INC eS O CONTROL CIRCU EE NOTE 4 3020447 DIA W RZA rg A RS GLE CURRENT 1 e 3 S 4 A RO Pi te B uS x R 2 gt LD VOLTAGE SUPPLY _ CURRENT MONITOR VOLTAGE MODE 51051 CURRENT MODE KW POLARITY REVERSAL OUTPUT ENABLE OV DIGITAL GROUND gt TAGE VOLTAGE MONITOR AGND ANALOG GROUND A Ria RIB A JO Cian v 3l gt 26 270 Cine 15 K Y R A a KL WEGA DS4 253 52 DSI 3192 2y A 14 R4 R3 R2 R C 150 150 150 150 lo z 5 6 oO 10 dk a OUTPUT VOLTAGE A 749772 ENABLEI MODE POLARITY CURRENT Goa REVERSED MODE 2 NOTES 1 gt RESISTORS IN OHMS AND CAPACITORS IN MICROFARADS 2 gt FOR COMPONENTS MARKED WITH TRIANGLE SYMB SEE PARTS LIST 3 gt COMPONENTS MARKED WITH ASTERISK SYMBOL MAY NOT BE PRESENT ON THE BOARD 4 FOR TYPE POWER SUPPLIES DIRECTED TO 5 6 5 THE HEADERS JS TO J7 ARE USED F
24. To take a reading the the Host Computer sends INX CURR cr 1f a The MAT previously set up now starts to measure and sends the proper time delay needed for the measurement b The Power Module Controller will send the time delay back to the Host Computer when it has been Talk Addressed see specific IEEE 488 interface requirements 00 cr If 7 The Host Computer then sends FTH CURR cr 1f a The MAT then sends the measured current in scientific notation to the Power Module Controller for example 1 9598 amps b The Power Module Controller in turn sends 1 9598 0 cr 1f MAT 1 3 RACK 112404 3 9 8 9 To open the Output Enable relay disconnect the load from the Power Module the Host Computer sends OPN CH9 cr The Power Module relay at address 9 is open To verify the previous command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 3 6 3 1 2 EXAMPLE 2 PROGRAM NEGATIVE VOLTAGE WITH CURRENT LIMIT 1 To program the Power Module MAT 55 7 to 45 volts with a current limit of 2 amps the Host Computer sends FNC DCS CH9 SET VOLT 45 SET CURL 2 cr 1f The MAT at address 9 is then programmed to 45 volts with a current limit of 2 amps To verify the previous command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 To enable
25. VLTL 17 Power supply at node address 8 commanded to Current mode with voltage limit of 17V FIGURE A 4 SET Command Syntax Function Description Example OPN CLS OPN CHnn CLS CHnn These commands are used to connect or disconnect the power supply from the load effective for MR and MGR options only OPN Disconnects the load from the power supply specified by the operand CLS Connects the load to the power supply specified by the operand OPN CH22 Opens the relay of the power supply at node address 22 CLS CH14 Closes the relay of the power supply at node address 14 FIGURE A 5 OPN CLS Open Close Relay Commands Syntax Function Example Syntax Function Description Example A 4 RST DCS CHnn This operator is used to return a power supply to its power on state The output voltage and current are programmed to zero and the output relay of MR and MGR models is opened RST DCS CH13 The power supply at node address 13 is reset FIGURE 6 RST Reset Command CNF or IST IST Causes power supply to execute confidence test The CNF operator commands the MAT to execute the confidence test procedure defined for the MAT power supplies IST is functionally identical to CNF for MAT power supplies The procedure consists of opening all power relays programming voltage and current to their maximum values switching polar ity checking for error flags then programming
26. ands sse ener nnne nennen A 4 A 0 RSI Reset Command Eo ap ind Ar Gent aed O ion ROA dE A 4 A 7 IST Confidence Test Internal Self Test 5 aaa aaa aaa aaa aaa aaa aaa aan A 4 8 STA Status A 5 ii MAT 25 14 112404 LIST OF TABLES TABLE TITLE PAGE 1 1 MAT Power Module Features And Specifications 1 3 1 2 Power Modules Power Output Ratings 22 00 2 1 1000 60 1 4 1 3 Safety 1 8 2 1 Hardware Required for Reshipment in Transport emere 2 1 2 2 Internal Controls Accessible Through Top 2 2 2 3 Front Control MAT Power Module 2 3 2 4 Rear Terminations MAT Power aaa aaa ian enne 2 4 2 5 Ac lnput Control Bus Connector Pin Designations 2 aan 2 4 2 6 DC Output Connector Pin Designations 2 ener 2 5 2 7 Internal Jumper Configuration 2 02 2 1 0100 00 nana aaa aaa aaa aaa 2 11 3 1 Device Address Selection For The MAT power Module sse em eee eren 3 4 A 1 Subsystem Command query Index sse A 1 2 CML Error Messages etr eee bia Bs A 5 MAT 25 14 112404 iii vi Blank SECTION
27. anel meter reading and internal measured values are the same 1 To program the Power Module to 36 volts with a current limit of 10 amps the Host Com puter sends FNC DCS CH3 SET VOLT 36 SET CURL 10 cr The MAT at address 3 is now set to 36 volts with a current limit of 10 amps 2 To verify the FNC command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 3 To measure the voltage at the output the Host Computer sends FNC DCS VOLT CH3 cr 1f The MAT at address 3 is now set to take a reading 4 To take a reading the Host Computer sends INX VOLT cr 1f a The MAT previously set up now starts to measure and send the proper time delay needed for the measurement b The Power Module Controller will send the time delay value back to the Host Com puter when it has been properly Talk Addressed see specific IEEE 488 interface requirements 0O0 cr If 5 The Host Computer then sends MAT 1 3 RACK 112404 2 9 2 FTH VOLT cr 1f a The MAT then sends the measured voltage in scientific notation to the Power Module Controller for example 36 005 volts which b The Power Module Controller in turn sends 3 6005E1 cr 1f Check that the front panel meter reading and the computer value are identical within the measurement tolerance The meter selection switch must be set to voltage for a reading EXAMPLE 2 FULL SCALE CU
28. d for remote programming of the MAT power supply For the complete command set and detailed SCPI programming information consult the Technical Manual for the applicable controller the SCPI command sets among trollers are slightly different See PAR 3 5 to establish the MAT power supply Control Bus BIT BUS address ROOT colon 3 6 INITiate STATus IMMediate OPERation CONTinuous CONDition ENABle MEASure EVENt CURRent PRESet VOLTage QUEStionable CONDition OUTPut ENABle STATe EVENt SOURce SYSTem VOLTage ERRor LEVel LANGuage IMMediate TRIGgered CURRent LEVel IMMediate TRIGgered FUNCtion MODE FIGURE 3 3 TREE DIAGRAM OF SCPI COMMANDS USED WITH MAT POWER SUPPLIES MAT 1 3 RACK 112404 3 6 2 1 SCPI PROGRAM EXAMPLE Figure 3 4 is an example of a program using SCPI commands to program the MAT Power Sup ply The program illustrated is for a configuration using an IBM PC or compatible with a National Instruments GPIB interface card It will be necessary to consult the manufacturer s data to achieve comparable functions with an interface card from a different manufacturer This pro gram sets output voltage Voltage mode or voltage limit Current mode to 5V and current limit Voltage mode or output current Current mode to 1A then reads the measured actual volt age and current then prints the measurements kkkkkkkk
29. d with the jumper installed To remove the jumper see Section 6 for PCB access and Figure 3 2 INTRODUCTION TO CONTROLLING THE MAT POWER MODULE OUTPUT The MAT family of Power Modules communicates remotely with a controller via the Control Bus Each MAT Power Module has a specific address on the bus The address from 1 to 30 is selected by the switches on the side of the unit see FIG 3 2 and Table 3 1 This address is set at Kepco to 3 MAT 1 3 RACK 112404 The MAT family of Power Modules is controlled by the Power Module Controller see PAR 1 2 For an explanation of remote programming refer to PAR 3 6 and Appendix A as well as the applicable Power Module Controller Manuals JE SENZA _ OY P1 A4 BOARD D J5 JUMPER lm L4 M 0 M P ZA 7 BOAI gt CL AX DDRESS D A m 5 Al N lt O x z CURRENT 227 REFERENC eee MONITO H A2 FIGURE 3 2 MATPOWER MODULE CONTROL SECTION TOP COVER REMOVED MAT 1 3 RACK 112404 TABLE 3 1 DEVICE ADDRESS SELECTION FOR THE MAT POWER MODULE DECIMAL A3S1 4 A3S1 3 A3S1 2 A3S1 1 A3S1 0 ADDRESS A4 A3 A2 A1 A0 1 0 0 0 0 1 2 0 0
30. e The output wiring terminals of this power supply have not been evaluated for field wiring and there fore must be properly configured by the end product manufacturer prior to use This power supply employs a supplementary circuit protector in the form of a circuit breaker mounted on the front panel This circuit breaker protects the power supply itself from damage in the event of a fault condition For complete circuit protection of the end product as well as the building wiring it is required that a primary circuit protection device be fitted to the branch circuit wiring EN61010 1 2001 CI 9 5 Hazardous voltages are present within this power supply during normal operation All operator adjust ments to the product are made via externally accessible switches controls and signal lines as speci fied within the product operating instructions There are no user or operator serviceable parts within the product enclosure Refer all servicing to qualified and trained Kepco service technicians 228 1373 COND CONFORM 112404 SAFETY INSTRUCTIONS 1 Installation Operation and Service Precautions This product is designed for use in accordance with EN 61010 1 and UL 3101 for Installation Category 2 Pollution Degree 2 Hazardous voltages are present within this product during normal operation The product should never be operated with the cover removed unless equivalent protection of the operator from accidental contact with hazardous internal
31. e MAT 1 3 Rack Power Module in the Rack Adapter hous ing and secure with two front panel slotted screws Refer to Rack Adapter manual for electrical connections of the rack adapter The following steps are recommended for inserting the Power Module into the Rack Adapter Tilt the front of the Power Module slightly lower then the rear set the two rearmost grom mets of the Module on the front lip of the Rack Adapter opening Lift the front of the Module until the bottom is approximately parallel to the bottom of the Rack Adapter and gently begin slidding in the Module maintaining support with both hands as needed to prevent the bottom of the Module from scrapping the lip of the Rack Adapter Once the Module has been inserted approximately 1 inch lift the handle upward raising the front of the Power Module some 20 up relative to the back bottom edge of the unit about an inch over the bottom front lip of the Rack Adapter Allow the Module to slide against the bottom inside guides of the Rack Adapter As this step is being done MAKE SURE that the top of the Power Module in particular the white connector on top of the power module clears the top edge of the Rack Adapter Continue to lift the unit by the front handle while inserting the Module until the frontmost pair of grommets clear the front lip of the Rack Adapter then allow the Module weight to be fully supported by the grommets on the bottom of the Module MAT 1 3 RACK 1
32. e at the center of gravity of the chassis due of its weight To transport the MAT Power Module in the transport cover supplied with the unit secure the power module with 6 32 steel round head phillips screws see Table 2 1 TABLE 2 1 HARDWARE REQUIRED FOR RESHIPMENT IN TRANSPORT COVER USE THESE SCREWS FOR THESE MAT USE THIS TRANSPORT COVER POWER MODULES KEPCO P N 6 32 x 3 8 6 32 x 3 4 KEPCO P N 101 0344 P N 101 0349 1 3 RACK 129 0231 QTY 10 N A 2 3 RACK 129 0232 QTY 14 QTY 2 To transport the MAT Power Module in the Rack Adapter RA 50 RA 51 secure each Power Module with Flat Head Phillips screws self tapping countersunk Flat Head Phillips size no 8 5 8 Kepco P N 101 0421 six for 1 3 rack models and eight for 2 3 rack models MAT 1 3 RACK 112404 2 1 If a transport cover is not available the MAT power module may be mounted on a 3 4 inch thick or greater piece of wood by using 8 18 thread forming screws with a type B style point A screw should be used to secure the wood to each of the mounting grommets in the bottom of the chassis 2 3 TERMINATIONS 1 Internal Calibration Controls Refer to Table 2 2 and Figure 3 2 2 Front Panel Refer to Table 2 3 and Figure 2 1 3 Rear Panel Refer to Table 2 4 and Figure 2 2 TABLE 2 2 INTERNAL CONTROLS ACCESSIBLE THROUGH TOP COVER REFERENCE DESIGNATION CONTROL PURPOSE A1R28 lo zero NOTE 1 Used to
33. ed for every ASCII character sent or received over the IEEE 488 GPIB MAT TMA PC 27 SYSTEM A Power Module Controller is available from Kepco that plugs directly into any DOS based com puter to control the Power Modules up to twenty seven Modules daisy chained to a single Con trol Bus without the need for an IEEE 488 GPIB The use of the TMA PC 27 allows the Power Module Controller microcomputer board the IEEE 488 GPIB interface input output port and the RS 232 interface input output port to be bypassed The TMA PC 27 Software can be loaded into a DOS based computer either as a Terminate and Stay TSR resident program or as a stand alone program As a TSR it may be called from any of the following languages TURBO C QUICK C POWER C TURBO PASCAL QUICK PAS CAL QUICK BASIC and INTERPRETED BASIC With the TMA Software loaded the MAT Power Modules may be programmed over the Control Bus using CIIL or KPL Kepco Programming Language KPL is a simplified command set based on CIIL Catastrophic error messages will remain in memory until the cause of the failure is determined and the error condition is corrected Additional functions not supported by CIIL have been included A non CIIL command TO calls for a noncatastrophic error message to be erased when a command other than Status is sent A T1 command causes noncatastrophic error messages to be stacked in memory until interrogated by a Status command A programming language referred to as
34. ein This is not to be confused with the protective earthing point and may not be used in place of it 3 Electric Shock Hazards This product outputs hazardous voltage and energy levels as a function of normal operation Operators must be trained in its use and exercise caution as well as common sense during use to prevent accidental shock This symbol appears adjacent to any external terminals at which hazardous voltage levels as high as 500V d c may exist in the course of normal or single fault condi tions This symbol appears adjacent to any external terminals at which hazardous voltage levels in excess of 500V d c may exist in the course of normal or single fault condi tions gt gt 228 1352 SAFETY COVER REMOVAL 112404 C D BLANK TABLE OF CONTENTS SECTION PAGE SECTION 1 INTRODUCTION 1 1 Scope OF Manual lect a t US dix oe oe she 1 1 1 2 General Description teme 1 1 1 3 Specifications e eden aes lad ec EGER eae sea b Eti ef aoe 1 3 1 4 DC Output Ratings For 1 3 2 3 And Full Rack Modules e mee 1 4 1 5 Miscellaneous Features 1 7 1 6 ACCESSOES Lotes Eee ee Ene s 1 7 1 7 NIENTE EE 1 8 SECTION 2 INSTALLATION 2 1 Unpacking And Inspections wii ae once ea nay 2 1 2 2 Transport instructior rre
35. elf tap ping countersunk Flat Head Phillips size no 6 32 x 3 8 Kepco P N 101 0344 located at each side of the transport cover These screws must be removed and saved with the cover for later transport use NOTE If the Power Modules are shipped in the RA 50 or RA 51 Rack Adapter the power modules must be removed before installing the rack adapter in a rack b To remove the 1 3 rack power module from the RA 50 RA 51 housing loosen the two slotted captive thumb screws on the front panel then remove and save the six Flat Head Phillips screws from the base of the housing Slide the power module out of the housing and set the Control Bus Address see PAR 3 5 Slide the power module back into the housing and fasten the two slotted captive thumb screws It is not advisable to replace the six Flat Head Phillips screws in the base of the housing unless the unit is going to be transported TRANSPORT INSTRUCTIONS CAUTION THE MAT POWER MODULE SHOULD BE SHIPPED ONLY IN THE RACK ADAPTER OR IN A TRANSPORT COVER FAILURE TO PROPERLY SECURE THE MAT POWER MODULE BEFORE SHIPPING WILL RESULT IN SEVERE DAMAGE TO THE EQUIPMENT AND VOID THE WARRANTY The MAT Power Module is a relatively heavy piece of equipment particularly due to the main Power Transformer chassis frame and electrolytic capacitors This means that the unit when shipped must be properly fastened in a transport cover rack adapter or by other means other wise the Power Module may buckl
36. er sends cr The Power Module Controller does self test All MAT Power Module output relays are dis abled all Power Modules go to maximum ratings and the Power Module Controller checks for error flags After the test the relays remain disabled and the Power Modules are then set to zero 2 To verify the CNF command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 3 6 3 1 1 EXAMPLE 1 PROGRAM POSITIVE VOLTAGE WITH CURRENT LIMIT 3 8 1 To program the Power Module MAT 55 7 to 50 volts with a current limit of 3 amps the Host Computer sends FNC DCS CH9 SET VOLT 50 SET CURL 3 cr 1f The MAT at address 9 is then set to 50 volts with a current limit of 3 amps MAT1 3 RACK 112404 2 To verify the previous command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 3 To close the Output Enable relay connects the Power Module to the load the Host Com puter sends CLS 9 5 The Power Module at address 9 closes the relay 4 To verify the previous command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 5 To measure the current at the output the Host Computer sends FNC DCS CH9 cr 1f The MAT at address 9 is now set to take a reading 6
37. he Power Transformer by the other hand if already in a Rack Adapter which is to be installed in an Equipment Rack must be han dled in exactly the same way as when installing the Power Module itself into a Rack Adapter Failure to observe this caution could result in misalignment of the Power Mod ules with the Rack Adapter MAT Power Modules may also be operated as a bench type instrument Leave the RA 50 or RA 51 feet installed then install the MAT 1 3 Rack Power Module in the RA 50 or RA 51 Rack Adapter housing and secure with two front panel slotted screws The RA 50 Rack Adapter houses up three 1 3 Rack Power Modules The Rack Adapter may be equipped with Front Filler panels The RFP 50 1 may be used to close one channel in the RA 50 or RA 51 Rack Adapter Filler Panel RFP 50 2 can be used to close two channels in the RA 50 or RA 51 Rack Adapter For installation into confined spaces care must be taken that the surrounding environment does not exceed the maximum specified ambient temperature of 50 C see PAR 2 5 2 7 GROUNDING 2 7 1 SAFETY GROUNDING a MAT 1 3 RACK 112404 AC Safety Ground The Power Module is connected to the AC safety ground via the AC INPUT CONTROL BUS connector and the corresponding rack adapter connector Isolation From Ground The DC output is isolated from the ac source and from the chassis or ground The maximum output voltage that can be supported between either output terminals and ground or chassi
38. imulus mode to specify the output mode of the power supply being programmed The first operand is the noun modifier and the second operand specifies the value The first operand field of the command contains the four 4 letter mnemonic for the output mode of the power supply The choices are VOLT VOLTAGE MODE OPERATION VLTL VOLTAGE LIMIT CURR CURRENT MODE OPERATION CURL CURRENT LIMIT The second operand field of the command contains the value assigned to the chosen output mode This value may be specified as accurately as the resolution of the MAT power supply allows 12 bits or 024 of maximum rated voltage or current It can be directly specified in ASCII integer decimal or in scientific notation There may be two 2 set commands separated by a space ASCII 32 for each power supply being programmed The following are the only allowable combinations VOLT with CURL CURR with VLTL The limit parameter CURL or VLTL may not be set without the main parameter A polarity sign may precede the VOLT or CURR value so that the power supply s polarity may be selected In the case of Kepco s MAT power supplies the two related Op Codes SRX and SRN are functionally identical to the SET command since there is only one range 0 maximum The commands are included only for compatibility FNC DCS CH12 SET VOLT 5 Power supply at node address 12 commanded to 5V Voltage mode with current limit of 3A FNC DCS CH08 SET CURR 2
39. kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk FR Sample Program For KEPCO power supply using National Instruments GPIB interface card or compatible computer kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk include lt stdio h gt include decl h char rd_str 80 char dat_str 80 int bd adr main adr ibfind DEV6 bd ibfind GPIBO ibsic bd ibsre bd 1 trcpy dat_str VOLT 5 CURR 1 treat dat_str r n ibwrt adr dat_str strlen dat_str u trcpy dat str MEAS VOLT URR treat dat_str r n ibwrt adr dat_str strlen dat_str u strset rd_str N0 ibrd adr rd_str 64 printf received s n rd_str Input buffer Output buffer Open DEV6 defined by IBCONF Open GPIB card Send Interfac Set remote lin Clear tru Define a set command Append delimiter Send string to power supply Define a measure command Append delimiter Send string to power supply Clear input buffer Read result of measure Print voltage and current FIGURE 3 4 TYPICAL EXAMPLE OF MAT POWER SUPPLY PROGRAM USING SCPI COMMANDS MAT 1 3 RACK 112404 3 7 3 6 3 3 6 3 1 CIIL PROGRAMMING The command language is used on early models of Kepco power supplies and controllers The command functions
40. lays To Obtain A Valid 3 1 3 4 Power Loss CIrCUlLt i Leo ek ad qi qe deren aal OR o etie b ected 3 2 3 5 Introduction To Controlling The MAT Power Module Output essem 3 2 3 5 1 MAT Power Module Controller System sese 3 4 3 5 2 27 System cete eres a edo ed eed dee deae eee uide 3 5 3 6 Remote Programimling TERRENI P EEE E 3 6 3 6 1 C arc n 3 6 3 6 2 SGPI Pr gramimitig 2 Lene Mo AOL T SkA 3 6 3 6 2 1 SCPI Pr ogram Example ai 2 Ir RA OE IE AO ee aac d UR ee dona 3 7 3 6 3 CIIL Programming 3 5 EE eee eerie ete ee EE eie etes 3 8 3 6 3 1 Examples Using CIII To Program The MAT Power 3 8 3 6 3 1 1 Example 1 Program Positive Voltage With Current Limit 3 8 3 6 3 1 2 Example 2 Program Negative Voltage With Current Limit seene 3 10 3 6 3 1 3 Example 3 Program Current And Voltage 3 11 APPENDIX A CIIL COMMAND DEFINITIONS MAT 25 14 112404 i LIST OF FIGURES FIGURE TITLE PAGE 1 1 Remotely Controlled Power Supply Configurations Using Kepco 1 2 1 2
41. ll Name Date OF SALES position 228 1348 DC COMP INST 112404 Conditions of Conformance When this product is used in applications governed by the requirements of the EEC the following restric tions and conditions apply 1 For European applications requiring compliance to the Low Voltage Directive 73 23 EEC this power supply is considered a component product designed for built in applications Because it is incom plete in construction the end product enclosure must provide for compliance to any remaining electri cal safety requirements and act as a fire enclosure EN61010 1 2001 6 7 8 and Cl 9 This power supply is designed for stationary installation within an RA 50 or RA 51 rack adapter Mains power is supplied via a detachable power supply cord or via direct wiring to the source power terminal block This power supply is considered a Class 1 earthed product It is intended for use as part of equip ment meant for test measurement and laboratory use and is designed to operate from single phase three wire power systems This equipment must be installed within a suitably wired equipment rack utilizing a three wire grounded mains connection See wiring section of this manual for complete electrical wiring instructions EN61010 1 2001 6 10 1 This power supply has secondary output circuits that are considered hazardous and which exceed 240 VA at a potential of 2V or mor
42. minal 1 to Sense Terminal 1 and Output Terminal 2 to Sense Terminal 2 each at the load see Figure 2 6 Refer to Table 2 6 and Figure 2 2 for DC Output connector pin func tions and locations When the MAT Power Module is connected for remote error sensing in the voltage mode a sit uation might occur where the output capacitor C14 must be supplemented to achieve optimum performance If oscillations are observed at the output terminals or at the load the load should be decoupled with another high quality capacitor of a value equal to or greater than C14 SENSE 1 NOTE DASHED LINE REPRESENTS GROUNDED LOAD CONNECTION FIGURE 2 6 LOAD CONNECTIONS REMOTE SENSING OPERATING CONFIGURATION The complete operating configuration is defined by The Model Number e g MAT 36 10 Jumper configuration of internal boards Table 2 4 lists the location of the internal jumpers and their function This information is provided for reference purposes only to indicate the configuration options available Do not attempt to MAT 1 3 RACK 112404 alter the jumper configuration For assistance in changing any jumper selected parameter con tact Kepco Applications Engineering TABLE 2 7 INTERNAL JUMPER CONFIGURATION JUMPER LOCATION FUNCTION ied NOT DESCRIPTION INSTALLED J1 J5 MAT 6 32 J1 J2 J3 J4 J5 MAT 15 20 J1 J2 J3 J5 J4 MAT 25 14 Establish the J1 J2 J3 J5 36 10 Model 1
43. nge 20 to 85 C d Cooling The fans are high efficiency single bearing fans with special low noise non metallic blades 1 6 ACCESSORIES NOTE All Kepco rack adapters fit standard EIA rack dimensions They are drilled for chassis slides see the RA 50 or RA 51 manual a Kepco Rack Adapter Model RA 50 is for three 1 3 Rack Size Power Modules Filler panels are available to cover empty slots if the adapter is not used to its full capacity b Kepco Rack Adapter Model RA 51 is for one 1 3 Rack Size and one 2 3 Rack Size Power Modules Filler panels to cover empty slots are available if the adapter is not used to its full capacity The Full Rack MAT Power Modules fit directly into a standard 19 inch Rack c One 2 meter long shielded twisted pair cable with two mating connectors one at each end Kepco P N 118 0699 is supplied with each Rack Adapter RA 50 or RA 51 and with each Full Rack MAT Power Module The Power Module Controller see PAR 1 2 and up to 27 MAT Power Modules can be connected in a daisy chain configuration as shown in FIG 1 3 The last in the daisy chain Power Module Control Bus Outlet must be terminated with a Ter minating Connector Assembly Kepco P N 195 0075 that is supplied with the Power Mod ule Controller MAT 1 3 RACK 112404 1 7 RA 50 I CONTROL BUS 375 KHz 5041465 FIGURE 1
44. operation Figure 2 3A shows the barrier terminal block set to 115 Va c operation Remove the jump ers on the barrier strip connecting terminals 2 to 3 and terminals 4 to 5 Place a jumper between terminals 3 and 4 For 230 Va c the barrier strip appears as in Fig ure 2 3B Verify that the source voltage on the Rack Adapter matches that of the Power Module Return the Module to the Rack Adapter NOTE To return to 115 Va c operation reverse the procedure Remove the jumper in step 4 and replace the jumpers in step 3 MAT 1 3 RACK 112404 2 5 2 5 2 6 2 6 JUMPERS CHASSIS 65 CHASSIS 65 3041515 BASE BASE N FIGURE 2 3 MODULE BARRIER STRIP WITH JUMPERS FOR 115 230 VA C COOLING The power transistors and rectifiers in the MAT Power Module are maintained within their oper ating temperature range by means of special heat sink assemblies cooled by an internal fan SIDE PANEL OPENINGS AND THE TOP OF THE CASE MUST BE KEPT CLEAR FROM OBSTRUCTIONS TO ENSURE PROPER AIR CIRCULATION If the MAT Power Module is rack mounted or installed in confined spaces care must be taken that the ambient temperature the temperature immediately surrounding the Power Module does not rise above the limit specified in Table 1 1 INSTALLATION If the unit is to be rack mounted install the RA 50 or RA 51 Rack Adapter in the rack per Rack Adapter instruction manual Install th
45. or this Similarly a model for a current stabilized Power Module includes a parallel capaci tor representing the dc and low frequency source impedance These considerations are important if 1 The load is constantly changing value 2 The load is switched on and off 3 The output of the Power Module is step programmed 4 The load is reactive 5 Dynamic output response of the Power Module is of concern 2 7 4 LOAD CONNECTION LOCAL ERROR SENSING The DC OUTPUT connector is located on the back of chassis and is designated A6 J2 in the schematic Table 2 6 and Figure 2 2 provide the function and location of DC OUTPUT connector pins NOTE The sense terminals MUST be configured for either local sensing as follows or remote sensing see PAR 2 7 5 for the MAT Power Module to operate If left unconnected the unit will automatically isolate the load and shut down For Local sensing connect Output Terminal 1 to Sense Terminal 1 and Output Terminal 2 to Sense Terminal 2 at the DC Output connector see Figure 2 5 m 3041943 NOTE DASHED LINE REPRESENTS GROUNDED LOAD CONNECTION FIGURE 2 5 LOAD CONNECTIONS LOCAL SENSING MAT 1 3 RACK 112404 2 9 2 7 5 2 8 2 10 LOAD CONNECTION WITH REMOTE ERROR SENSING The MAT series of Power Modules can operate with sensing external to the Module Sensing should be with a twisted wire pair to reduce noise The sensing wires must be connected as fol lows Output ter
46. output connect the load to the Power Module the Host Computer sends CLS 9 sp 1f The Power Module relay at address 9 closes To verify the previous command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 To measure the voltage at the output the Host Computer sends FNC DCS VOLT CH9 cr The MAT at address 9 is now set to take a reading MAT1 3 RACK 112404 6 To take reading the Host Computer sends INX VOLT cr a The MAT previously set up now starts to measure and sends the proper time delay needed for the measurement b The Power Module Controller will send the time delay back to the Host Computer when it has been Talk Addressed see specific IEEE 488 interface requirements 00 cr If 7 The Host Computer then sends FTH VOLT cr 1f a The MAT then sends the measured in the example it is 45 01 volts voltage in scien tific notation to the Power Module Controller b The Power Module Controller in turn sends 4 5010E1 cr 8 To reset the Power Module at address 9 the Host Computer sends RST DCS CH9 The MAT then programs the output to zero and opens the Output Enable relay 9 To verify the previous command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 3 6 3 1 3 EXAMPLE 3 PROGRAM CURRENT
47. ower Modules directly from a computer a Controller Model TMA PC 27 plugs into a half card slot of a DOS based PC and allows key board control of the MAT via the IEEE 1118 bus b Controller Model TMA 4882 27 is free standing and allows host computers designed for RS232 or IEEE 488 bus communication to control the MAT via the IEEE 1118 bus c Controller Model TMA VXI 27 plugs into a slot in a VXI chassis and allows VXl based com puters to control the MAT via the IEEE 1118 bus d Controller Model MST 488 27 plugs into a slot in a Model RA 55 Rack Adapter and allows host computers designed for RS232 or IEEE 488 bus communication to control the MAT via the IEEE 1118 bus e The MAT Power Module can also be directly controlled via the keypad of the MBT Series G Option Power Supply via the IEEE 1118 bus An important feature of the MAT Series Power Module is the overvoltage and overcurrent pro tection circuits This protection is provided by two autotracking amplifiers that have an overvolt age and overcurrent tracking range of 10 3 above the programmed Power Module output voltage or current The MAT series Power Modules are built in 1 3 Rack 2 3 Rack and Full Rack mechanical sizes according to their approximate output power rating see Mechanical Outline Drawing of the Power Module Chassis Figure 1 2 Power transistors and drivers on all Power Module designs are mounted on highly efficient pat ented heat sink assemblies tha
48. plug into RA 51 inch Rack modules plug into RA 51 Filler Panels For either RA 50 RFP 50 1 1 3 Panel or RA 51 RFP 50 2 2 3 Panel 1 4 DC OUTPUT RATINGS FOR 1 3 2 3 AND FULL RACK MODULES a MAT Power Module DC Output Ratings 1 3 2 3 and Full Rack Size see Table 1 2 b Output range 1 Voltage mode 0 100 of rated voltage 2 Current mode 0 100 of rated current TABLE 1 2 MAT POWER MODULES POWER OUTPUT RATINGS 360W MODULES 1 3 RACK SIZE DC OUTPUT RATINGS MODEL VOLTS AMPS POWER MAT 6 32 0 6 0 32 192 MAT 15 20 0 15 0 20 300 MAT25 14 0 25 0 14 350 MAT 36 10 0 36 0 10 360 MAT 55 7 0 55 0 7 385 MAT 75 5 0 75 0 5 375 MAT 100 3 6 0 100 0 3 6 360 MAT 150 2 4 0 150 0 2 4 360 1 4 MAT 1 3 RACK 112404 TABLE 1 2 MAT POWER MODULES POWER OUTPUT RATINGS 360W MODULES 1 3 RACK SIZE DC OUTPUT RATINGS 720W MODULES 2 3 RACK DC OUTPUT RATINGS MODEL VOLTS AMPS POWER MAT 6 64 0 6 0 64 384 MAT 15 40 0 15 0 40 600 MAT25 28 0 25 0 28 700 MAT 36 20 0 36 0 20 720 MAT 55 14 0 55 0 14 770 MAT 75 10 0 75 0 10 750 MAT 100 7 2 0 100 0 7 2 720 MAT 150 4 8 0 150 0 150 720 1080W MODULES FULL RACK DC OUTPUT RATING MODEL VOLTS AMPS POWER MAT 6 100 0 6 0 100 600 MAT 15 60 0 15 0 60 900 MAT 25 42 0 25 0 42 1050 MAT 36 30 0 36 0 30 1080 MAT 55 20 0 55 0 20 1100 MAT 75 15 0 75 0 15 1125 MAT 100 10 0 100 0 10 1000 MAT 150 7 0 15
49. r Module Controller to report catastrophic failures Communications with an exter nal terminal are achieved via an RS 232 communications bus and related interface card Power for the microcomputer board of the TMA 4882 27 Power Module Controller is provided by a wide range input Power Supply Kepco Model MRW 150KV The AC input voltage can range from 95 Volts AC to 264 Volts AC thereby eliminating the need for an input voltage selector The IEEE 488 GPIB implements a number of Interface Functions from the IEEE 488 protocol see the Power Module Controller Operator s Manual for details on these functions The Power Module Controller microcomputer continuously polls all the Power Modules via the Power Mod ule microcontroller on Digital Card A3 see PAR 4 25 3 on the high speed Control Bus for any change in their Status conditions A Status Monitor Interface Board is provided in the Power Module Controller as an interface to the Host Computer for reporting catastrophic failures within the Power Modules If such an error is reported back to the Power Module Controller the Host Computer then sends a Device Clear Command to open the isolation relays and reset all the Power Modules to zero Following that a Status command is sent to determine the nature of the failure In Data Mode the Power Module Controller sends or receives messages per the IEEE 488 GPIB protocol The messages are Enabled when the Attention line goes high A Handshake cycle is perform
50. s is 500 Vdc plus the maximum output voltage of the Power Module Either terminal of the output may be grounded 2 7 2 7 2 2 7 3 DC OUTPUT GROUNDING DC output connections are those between the Power Module and the load including remote sensing connections if necessary Despite precautions to eliminate noise such as shielding and twisted wire pairs output connections may pick up radiated noise of a wide frequency To mini mize such undesired effects one side of the Power Module output load should be grounded Successful D C grounding depends on careful analysis of the system operation However here only general guide lines are provided One of the major points is to avoid ground loops Ground loops are created when two or more points of different ground potentials in the output circuit are grounded A noise voltage is developed that is superimposed on the load output potential A way to avoid ground loops is to investigate for points of resistance to ground Differences in ground potential can be avoided if the output circuit is completely isolated A single point is then selected along the Power Module output circuit and returned to ground with a single wire This method is dependent on the specific application The MAT Power Modules are designed with Power Isolation relays that comply with MATE Modular Automated Test Equipment Test Module Adapter requirements Each output is fully isolated from other outputs and from ground
51. t are cooled by fans MAT 1 3 and 2 3 Rack size modules are designed to operate in either one of two housings called RA 50 and RA 51 RA 50 is 5 1 4 x 19 x 25 and accepts up to three 1 3 Rack Power Modules 51 is similarly sized but configured for one 1 3 Rack Module and one 2 3 Rack Module Full Rack MAT Power Modules mount directly into a standard 19 inch Equipment Rack MAT 1 3 RACK 112404 1 1 SLONGOUd ONISN SNOILVYNSIANOSD 5 HHMOd GATIONLNOSD ATALOWSAY L LA8NDIH 9zez 18 zez Lid IXA A LC NMWI L1I8 S LE IXA AAA VOL UU JOU MAT 1 3 RACK 112404 1 2 1 3 SPECIFICATIONS ELECTRICAL a MAT Power Module Features And Specification TABLE 1 1 MAT POWER MODULE FEATURES AND SPECIFICATIONS MAT POWER MODULE PARAMETER CONDITION 1 3 RACK 2 3 RACK FULL RACK Input Voltage Range USER 105 125 VAC SELECTABLE 210 250 VAC 115 VAC 7 0A 14 0A 21 0A Input Current Max 230 VAC 3 5A 7 0A 10 5A Input Frequency RANGE 47 63 Hz Voltage Current Adjust 0 to 100 of rating by preprogrammed setting RANGES ERNA AR R ment Range within inheren
52. t resolution limits Programming Voltage 0 024 Eo max 12 bits Resolution Curren 0 024 lo max 12 bits Voltage 0 024 Eo max Programming Accuracy Curren 0 1 lo max Data Read Back Voltage 0 1 Eo max Accuracy via Digital Bus Curren 0 12 lo max Voltage 0 001 Eo max Source Effect Curren 0 005 lo max Voltage 0 002 Eo max Load Effect Curren 0 024 lo max or 4 mA whichever is greater Voltage 0 01 Eo max Time 8 Hour Drift Curren 0 02 lo max Temperature Voltage 0 01 Eo max Coefficient C Curren 0 02 lo max Voltage rms 0 001 Eo max or 0 3 mV whichever is greater 9 p p 0 01 Eo max or 3 mV whichever is greater Ripple amp Noise Current rms 0 03 lo max p p 0 3 lo max 150 usec to recover within 0 1 Eo max for 10 to 100 Transient Recovery Voltage step in rated load current Operating 0 to 50 C Temperature Storage 20 to 70 C Cooling Built in fan air exhaust to rear Remote Sensing Range 0 5 volts per lead Provision for 4 terminal connection to load DC Output Isolation Voltage 500 Vdc Leakage Current Output to chassis 5 rms or 50 115V a c Series Parallel Operation Consult Kepco application engineering Output Display 3 1 2 digit LCD Switch selectable voltage current Panel Meter Indicators 4 LEDs Voltage and Current Mode Output Enabled Polarity Reversed Output Enable Disable Built in power and sensing relays controlled through IEEE 1118 bus Polarit
53. ter and the Power Module Controller to the IEEE 488 GPIB Apply the ac power to the units in the following sequence MAT Power Modules first and Power Module Controller last In the event that this sequence is reversed the Power Module Controller is connected first and then the MAT Power Module is connected second the operator must send a IEEE 488 GPIB Device Clear Interface Function via the Host Computer For proper time delays between com mands refer to PAR 3 3 For details on the commands refer to PAR 3 6 3 and Appendix as well as the Power Module Controller Manual The following does not include the IEEE 488 Bus Commands 1 To verify the Power Module is operational the Host Computer sends cr a The Power Module Controller does self test MAT 1 3 RACK 112404 2 11 2 9 1 2 12 b All MAT Power Modules output enable relays open all Power Modules go to maximum rating and the Power Module Controller checks for error flags After the test the relays remain open and the Power Modules are set to zero 2 To verify the CNF command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 1 3 Proceed per PAR 2 9 1 through 2 9 3 substituting full scale voltage current values appropi ate to the model being checked EXAMPLE 1 FULL SCALE VOLTAGE CHECK Program the Power Module MAT 36 10 to full scale voltage and check that the front p
54. urred due to thermal causes 207 DCSnn DEV Overload The voltage or current limit point was exceeded 207 DCSnn DEV Voltage Fault The output voltage is not within limits voltage mode 207 DCSnn DEV Current Fault The output current is not within limits current mode 207 DCSnn DEV Relay Not Opened The power relay failed to open F07 DCSnn DEV Relay Not Closed The power relay failed to close 207 DCSnn DEV Polarity Error The output polarity is not correct F07 DCSnn DEV Load Path Fault Open or miswired load or error sense leads detected F07 DCSnn MOD Invalid Command Improper syntax was used 207 DCSnn DEV Not Ready The output voltage or current has not settled 207 DCSnn DEV Device Not Present The specified power supply was not present during power up or during the last DCL 207 DCSnn DEV Device Not Responding The power supply has failed to communicate to the controller F07 DCSnn DEV Invalid Voltage Range The programmed voltage is outside the power supply s range 207 DCSnn DEV Invalid Current Range The programmed current is outside the power supply s range F07 DCSnn DEV Set Modifier Error An improper SET command was sent F07 DCSnn DEV Invalid Device ID The selected channel was not between 1 31 Catastrophic error Non Catastrophic error FIGURE A 8 STA Status Command MATSVC 112404 A 5 A 6 Blank
55. ust be set to Current for a reading 2 9 3 EXAMPLE 3 TO RESET THE POWER MODULE 1 To reset the Power Module at address the Host Computer sends RST DCS CH3 cr 1f 2 To verify the RST command was implemented the Host Computer sends STA cr The Power Module Controller sends back if no errors occur sp cr 3 This concludes the preliminary check out of the MAT Power Module 2 14 MAT 1 3 RACK 112404 3 1 3 2 3 3 SECTION 3 OPERATION GENERAL Interconnections linking a stabilized Power Module to an AC power source and a load are critical For optimum performance certain rules must be observed These rules are described in detail in the following paragraphs SERIES CONNECTION OF MAT POWER MODULES When connecting MAT Power Modules in series it is recommended that they be enabled and disabled in sequentially That is to say the output enable relays will be closed or opened one immediately preceding the other The Power Modules can be enabled or disabled in any order The system Status must be checked after a Relay Enable or Disable Command is sent The two MAT Power Module addresses in this example are 17 and 21 To enable the Modules connected in series the Host Computer sends CLS CH17 cr STA cr 1f CLS CH21 cr 1f STA cr To disable the Modules connected in series the Host computer sends OPN CH21 cr 1f STA cr OPN CH17 cr 1f STA cr
56. voltage and current to zero The results of CNF are obtained through the STA command CNF All power supplies in the daisy chain execute confidence test IST All power supplies in the daisy chain execute self test FIGURE 7 IST Confidence Test Internal Self Test Commands MATSVC 112404 STA Syntax STA Function Causes power supply to return operating status to controller Description This operator commands the power supply to report its present operating status Status is reported in the form of a message character string as defined below Any catastrophic error conditions indicated by in the table below which exist will be reported until the error condition is corrected As required by CIIL all error messages begin with an ASCII F Fault followed by a 2 digit code 07 Halt The code that follows SCSnn indicates the type of device and the channel number The next 3 digit code describes the nature of the fault DEV for device related errors or MOD for non device errors such as syntax TABLE 2 ERROR MESSAGES ERROR MESSAGE EXPLANATION 207 DCSnn DEV Power Loss The power supply has lost its input power F07 DCSnn DEV Crowbarred MAT A shutdown occurred due to overvoltage or overcurrent 207 DCSnn DEV Device Turned Off BOP 207 DCSnn DEV Output Fault MST 207 DCSnn DEV Over Temperature A shutdown occ
57. y Reversal Built in power and sensing relays controlled through IEEE 1118 bus MAT 1 3 RACK 112404 1 3 TABLE 1 1 MAT POWER MODULE FEATURES AND SPECIFICATIONS CONTINUED MAT POWER MODULE off input PARAMETER CONDITION 1 3 RACK 2 3 RACK FULL RACK Overvoltage Tracks program voltage Crowbars output and turns off input Overcurrent Tracks program current Crowbars output and turns off input Protection Overtemperature Monitors heat sink temperature Crowbars output and turns Polarity Reversal Built in diodes protect unipolar supply output Power Loss Detects loss of ac input power disables output 3 wire power entry via user configurable mating connector Source Connections 4 supplied and proper gage wires not supplied 5 wire connection via user configurable mating connector supplied and proper gage wires not supplied Load Connections DC Power Output 2 wires Output Sense Terminals 2 wires Ground 1 wire Two 2 wire connections via user configurable mating Remote Control connector supplied and 22 AWG wire not supplied Signal Connections Connectors in parallel for daisy chaining multiple power supplies full rack only Dimensions See Figure 1 2 Weight LBS 33 60 75 Three 1 3 rack modules plug into 50 1 3 1 3 Full Rack mounts Mounting Front 2 3 rack modules directly into 19 and one 2 3 rack h
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