KEPCO EL Series Electronic Operator Manual
OPERATOR’S MANUAL
SERIES EL
ELECTRONIC LOAD
KEPCO INC.
An ISO 9001 Company.
ELECTRONIC LOAD
IMPORTANT NOTES:
1) This manual is valid for the following Firmware Versions:
FIRMWARE VERSION UNIT REVISION NO. NOTE
2) A Change Page may be included at the end of the manual. All applicable changes and
3) The contents of this manual are protected by copyright. Reproduction of any part can be
3.63 and higher
revision number changes are documented with reference to the equipment serial numbers. Before using this Instruction Manual, check your equipment firmware version number to identify your model. If in doubt, contact your nearest Kepco Representative, or the
Kepco Documentation Office in New York, (718) 461-7000, requesting the correct revision
for your particular model and firmware version number.
made only with the specific written permission of Kepco, Inc.
MODEL
Series EL
Data subject to change without notice.
©2012, KEPCO, INC
P/N 243-1295-r4b
KEPCO, INC. z 131-38 SANFORD AVENUE z FLUSHING, NY. 11355 U.S.A. z TEL (718) 461-7000 z FAX (718) 767-1102
email: hq@kepcopower.com z World Wide Web: http://www.kepcopower.com
KEPCO®
THE POWER SUPPLIER™
TABLE OF CONTENTS
SECTION PAGE
SECTION 1 - INTRODUCTION
1.1 Scope of Manual......................................................................................................................................... 1-1
1.2 Introduction................................................................................................................................................. 1-1
1.3 General Description .................................................................................................................................... 1-1
1.4 Operating Modes ........................................................................................................................................ 1-3
1.4.1 CI (Constant Current). ............................................................................................................................. 1-3
1.4.2 CV (Constant Voltage) ............................................................................................................................ 1-3
1.4.3 CP (Constant Power) .............................................................................................................................. 1-3
1.4.4 CR (Constant Resistance)....................................................................................................................... 1-3
1.4.5 CS (Constant Conductance) ................................................................................................................... 1-3
1.4.6 Short........................................................................................................................................................ 1-3
1.4.7 Off............................................................................................................................................................ 1-3
1.5 Features...................................................................................................................................................... 1-3
1.5.1 Local Control ........................................................................................................................................... 1-3
1.5.2 Remote Control ....................................................................................................................................... 1-4
1.5.3 Analog Programming............................................................................................................................... 1-4
1.5.4 Digital Calibration .................................................................................................................................... 1-4
1.5.5 Damping .................................................................................................................................................. 1-4
1.5.6 Built-in Protection .................................................................................................................................... 1-4
1.5.7 Master/Slave Control............................................................................................................................... 1-4
1.6 Specifications.............................................................................................................................................. 1-5
1.7 Equipment Supplied.................................................................................................................................... 1-6
1.8 Accessories ................................................................................................................................................ 1-7
1.9 Options ....................................................................................................................................................... 1-7
1.10 Safety.......................................................................................................................................................... 1-7
SECTION 2 - INSTALLATION
2.1 Unpacking and Inspection .......................................................................................................................... 2-1
2.2 Terminations and Controls.......................................................................................................................... 2-1
2.2.1 Front Panel Controls and Indicators........................................................................................................ 2-1
2.2.2 Rear Panel Connections. ........................................................................................................................ 2-1
2.3 Mains Power Requirements........................................................................................................................ 2-5
2.3.1 Changing Mains Power Voltage .............................................................................................................. 2-6
2.4 Cooling........................................................................................................................................................ 2-7
2.5 Installation................................................................................................................................................... 2-8
2.5.1 Rack Mounting ........................................................................................................................................ 2-8
2.5.2 Slide Mounting......................................................................................................................................... 2-8
2.6 Wiring Instructions ...................................................................................................................................... 2-8
2.6.1 Mains Power............................................................................................................................................ 2-9
2.6.2 Unit Under Test (UUT) to Load Connection ............................................................................................ 2-9
2.6.2.1 Power Connections ............................................................................................................................ 2-9
2.6.2.2 Sense Connections ............................................................................................................................ 2-10
2.6.2.3 Grounding .......................................................................................................................................... 2-11
2.6.3 Parallel Master/Slave Configurations ...................................................................................................... 2-11
2.6.4 Analog Control Connections.................................................................................................................... 2-12
2.6.5 Current Monitor Connections .................................................................................................................. 2-13
2.7 Digital Connections..................................................................................................................................... 2-13
2.7.1 Standard Units......................................................................................................................................... 2-13
2.7.2 G Option - GPIB Interface ....................................................................................................................... 2-13
2.7.3 E Option - Ethernet Interface................................................................................................................... 2-13
SECTION 3 - OPERATION
3.1 General ....................................................................................................................................................... 3-1
3.2 Factory Default Settings ............................................................................................................................. 3-1
3.3 Turning the Unit On .................................................................................................................................... 3-2
3.3.1 Error Conditions ...................................................................................................................................... 3-2
3.4 Selecting the Mode and Setpoint................................................................................................................ 3-2
SERIES EL 020498 i
TABLE OF CONTENTS
SECTION PAGE
3.5 Engaging the Load..................................................................................................................................... 3-3
3.6 Disengaging the Load ................................................................................................................................ 3-3
3.7 Viewing Configuration Information ............................................................................................................. 3-4
3.8 Changing IP Mode ..................................................................................................................................... 3-4
3.9 Changing Static IP Address or Subnet Mask............................................................................................. 3-4
3.10 Changing GPIB Address............................................................................................................................ 3-5
3.11 Operation of Master/slave Configurations.................................................................................................. 3-5
3.11.1 Power Up................................................................................................................................................ 3-6
3.11.2 Local (Front Panel) Operation ................................................................................................................ 3-6
3.11.3 Remote (Computer) Operation ............................................................................................................... 3-6
3.11.4 Indications During Master/Slave Operation ............................................................................................ 3-6
3.11.5 Master/Slave Controls and Indicators..................................................................................................... 3-6
3.11.6 Master/Slave Operating Notes/Cautions/Warnings ................................................................................ 3-7
3.11.7 Master/Slave Disconnect........................................................................................................................ 3-7
3.12 Operation via Computer Interface.............................................................................................................. 3-7
3.13 SCPI Programming .................................................................................................................................... 3-8
3.13.1 SCPI Messages...................................................................................................................................... 3-8
3.13.2 Common Commands/Queries ................................................................................................................ 3-8
3.13.3 SCPI Subsystem Command/Query Structure......................................................................................... 3-11
3.13.3.1 DIAGNOSTIC Subsystem ................................................................................................................. 3-11
3.13.3.2 PROTection Subsystem .................................................................................................................... 3-12
3.13.3.3 [SOURce:]MEASure Subsystem ....................................................................................................... 3-12
3.13.3.4 [SOURce:]InPut, [SOURce:]OUTPut Subsystems ............................................................................ 3-12
3.13.3.5 [SOURce:]VOLTage, [SOURce:]CURRent, [SOURce:]POWer Subsystems.................................... 3-12
3.13.3.6 [SOURce:]Resistance, [SOURce:]CONDuctance Subsystems......................................................... 3-12
3.13.3.7 STATus Subsystem........................................................................................................................... 3-12
3.13.3.8 SYSTem subsystem .......................................................................................................................... 3-13
3.13.4 Program Message Structure................................................................................................................... 3-13
3.13.4.1 Keyword............................................................................................................................................. 3-13
3.13.4.2 Keyword Separator............................................................................................................................ 3-13
3.13.4.3 Query Indicator .................................................................................................................................. 3-13
3.13.4.4 Data ................................................................................................................................................... 3-13
3.13.4.4.1 Multiple Line Messages............................................................................................................... 3-13
3.13.4.5 Data Separator .................................................................................................................................. 3-14
3.13.4.6 Message Terminator.......................................................................................................................... 3-14
3.13.5 Understanding The Command Structure................................................................................................ 3-15
3.13.6 Program Message Syntax Summary...................................................................................................... 3-15
3.13.7 Status Reporting..................................................................................................................................... 3-16
3.13.7.1 Status Reporting Structure ................................................................................................................ 3-16
3.13.7.2 Standard Event Status Register ........................................................................................................ 3-16
3.13.7.3 QUEStionable Status Register .......................................................................................................... 3-18
3.13.7.4 Channel Status Register.................................................................................................................... 3-18
3.13.7.5 Channel Summary Register .............................................................................................................. 3-19
3.13.7.6 Status Byte Register.......................................................................................................................... 3-19
3.14 Damping..................................................................................................................................................... 3-19
3.14.1 Damping Adjustments............................................................................................................................. 3-19
3.15 Analog Programming ................................................................................................................................. 3-21
3.16 Operator Maintenance ............................................................................................................................... 3-22
APPENDIX A - IEEE 488.2 COMMAND/QUERY DEFINITIONS
A.1 Introduction ................................................................................................................................................ A-1
A.2 *CLS — Clear Status Command................................................................................................................ A-1
A.3 *ESE — Standard Event Status Enable Command ................................................................................... A-1
A.4 *ESE? — Standard Event Status Enable Query........................................................................................ A-2
A.5 *ESR? — Event Status Register Query ..................................................................................................... A-2
ii SERIES EL 070312
TABLE OF CONTENTS
SECTION PAGE
A.6 *IDN? — Identification Query..................................................................................................................... A-2
A.7 *OPC — Operation Complete Command .................................................................................................. A-2
A.8 *OPC? — Operation Complete Query....................................................................................................... A-2
A.9 *RST — Reset Command.......................................................................................................................... A-3
A.10 *SRE — Service Request Enable Command ............................................................................................ A-3
A.11 *SRE? — Service Request Enable Query................................................................................................. A-4
A.12 *STB? — Status Byte Register Query ....................................................................................................... A-4
A.13 *WAI — Wait Command ............................................................................................................................ A-4
APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS
B.1 Introduction................................................................................................................................................ B-1
B.2 Numerical Values and Data Conventions .................................................................................................. B-2
B.3 DIAGnostic:RESet Command.................................................................................................................... B-2
B.4 DIAGnostic:TREE:DISPlay Command ...................................................................................................... B-2
B.5 DIAGnostic:TREE:SEParator Command................................................................................................... B-2
B.6 DIAGnostic:TREE:SEParator? Query........................................................................................................ B-2
B.7 LOCK Command ....................................................................................................................................... B-3
B.8 LOCK? Query ............................................................................................................................................ B-3
B.9 [SOURce:]INPut[:STATe] Command ......................................................................................................... B-3
B.10 [SOURce:]INPut[:STATe]? Query .............................................................................................................. B-3
B.11 [SOURce:]INPut:PROTection:CLEar Command........................................................................................ B-3
B.12 [SOURce:]INPut:PROTection:SHORt[:STATe] Command......................................................................... B-3
B.13 [SOURce:]OUTPut[:STATe] Command ..................................................................................................... B-3
B.14 [SOURce:]OUTPut[:STATe]? Query .......................................................................................................... B-3
B.15 [SOURce:]OUTPut:PROTection:CLEar Command.................................................................................... B-3
B.16 [SOURce:]OUTPut:PROTection:SHORt[:STATe] Command..................................................................... B-4
B.17 [SOURce:]MEASure:ALL? Query.............................................................................................................. B-4
B.18 [SOURce:]MEASure:ALL2? Query ............................................................................................................ B-4
B.19 [SOURce:]MEASure[:SCALar]:CURRent[:DC]? Query ............................................................................. B-4
B.20 [SOURce:]MEASure[:SCALar]:POWer[:DC]? Query................................................................................. B-4
B.21 [SOURce:]MEASure[:SCALar]:VOLTage[:DC]? Query.............................................................................. B-4
B.22 [SOURce:]CONDuctance[:LEVel][:IMMediate][:AMPlitude] Command ..................................................... B-4
B.23 [SOURce:]CONDuctance[:LEVel][:IMMediate][:AMPlitude]? Query.......................................................... B-4
B.24 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] Command............................................................. B-5
B.25 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude]? Query.................................................................. B-5
B.26 [SOURce:]CURRent:PROTection[:LEVel] Command ................................................................................ B-5
B.27 [SOURce:]CURRent:PROTection[:LEVel]? Query..................................................................................... B-5
B.28 [SOURce:]CURRent:PROTection:STATe Command................................................................................. B-5
B.29 [SOURce:]CURRent:PROTection:STATe? Query ..................................................................................... B-5
B.30 [SOURce:]MODE Command ..................................................................................................................... B-5
B.31 [SOURce:]MODE? Query.......................................................................................................................... B-5
B.32 [SOURce:]POWer[:LEVel][:IMMediate][:AMPlitude] Command................................................................. B-6
B.33 [SOURce:]POWer[:LEVel][:IMMediate][:AMPlitude]? Query ..................................................................... B-6
B.34 [SOURce:]POWer:PROTection Command ................................................................................................ B-6
B.35 [SOURce:]POWer:PROTection? Query..................................................................................................... B-6
B.36 [SOURce:]POWer:PROTection:STATe[:LEVel] Command........................................................................ B-6
B.37 [SOURce:]POWer:PROTection:STATe[:LEVel]? Query............................................................................. B-6
B.38 [SOURce:]RESistance[:LEVel][:IMMediate][:AMPlitude] Command.......................................................... B-6
B.39 [SOURce:]RESistance[:LEVel][:IMMediate][:AMPlitude]? Query .............................................................. B-6
B.40 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] Command ............................................................. B-7
B.41 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? Query .................................................................. B-7
B.42 [SOURce:]VOLTage:PROTection:OVEr Command ................................................................................... B-7
B.43 [SOURce:]VOLTage:PROTection:OVEr? Query........................................................................................ B-7
B.44 [SOURce:]VOLTage:PROTection:OVEr:STATe[:LEVel] Command .......................................................... B-7
SERIES EL 020498 iii
TABLE OF CONTENTS
SECTION PAGE
B.45 [SOURce:]VOLTage:PROTection:OVEr:STATe[:LEVel]? Command......................................................... B-7
B.46 [SOURce:]VOLTage:PROTection:UNDer Command ................................................................................. B-7
B.47 [SOURce:]VOLTage:PROTection:UNDer? Query...................................................................................... B-8
B.48 [SOURce:]VOLTage:PROTection:UNDer:STATE[:LEVel] Command ........................................................ B-8
B.49 [SOURce:]VOLTage:PROTection:UNDer:STATE[:LEVel]? Query............................................................. B-8
B.50 STATus:CHANnel[:EVENt]? Query............................................................................................................ B-8
B.51 STATus:CHANnel:CONDition Command .................................................................................................. B-8
B.52 STATus:CHANnel:CONDition? Query ....................................................................................................... B-8
B.53 STATus:CHANnel:ENABle Command....................................................................................................... B-9
B.54 STATus:CHANnel:ENABle? Query............................................................................................................ B-9
B.55 STATus:CSUMmary[:EVENt]? Query........................................................................................................ B-9
B.56 STATus
B.57 STATus:CSUMmary:ENABle? Query........................................................................................................ B-9
B.58 STATus:OPERation[:EVENt]? Query......................................................................................................... B-9
B.59 STATus:OPERation:CONDition? Query .................................................................................................... B-10
B.60 STATus:OPERation:ENABle Command.................................................................................................... B-10
B.61 STATus
B.62 STATus
B.63 STATus:OPERation:PTRansition Command............................................................................................. B-10
B.64 STATus:QUEStionable[:EVENt]? Query .................................................................................................... B-10
B.65 CONDition
B.66 STATus:QUEStionable:ENABle Command ............................................................................................... B-11
B.67 STATus:QUEStionable:ENABle? Query .................................................................................................... B-11
B.68 SYSTem:COMMunicate[:GPIB]:ADDress Command................................................................................. B-11
B.69 SYSTem:COMMunicate[:GPIB]:ADDress? Query ..................................................................................... B-11
B.70 SYSTem:COMMunicate:ECHO Command................................................................................................ B-11
B.71 SYSTem:COMMunicate:ECHO? Query..................................................................................................... B-12
B.72 SYSTem:COMMunicate:LAN:IPADdress Command ................................................................................. B-12
B.73 SYSTem:COMMunicate:LAN:IPADdress? Query ...................................................................................... B-12
B.74 SYSTem:COMMunicate:LAN:MAC? Query ............................................................................................... B-12
B.75 SYSTem:COMMunicate:LAN:MODE Command........................................................................................ B-12
B.76 SYSTem:COMMunicate:LAN:MODE? Query ............................................................................................ B-12
B.77 SYSTem:COMMunicate:LAN:SUBNetmask Command............................................................................. B-12
B.78 SYSTem:COMMunicate:LAN:SUBNetmask? Query.................................................................................. B-13
B.79 SYSTem:DAMPing COMMAND................................................................................................................. B-13
B.80 SYSTem:DAMPing? Query ........................................................................................................................ B-13
B.81 SYSTem:ERRor? Query ............................................................................................................................ B-13
B.82 SYSTem:EXTernal COMMAND ................................................................................................................. B-13
B.83 SYSTem:EXTernal? Query......................................................................................................................... B-13
B.84 SYSTem:FAN COMMAND......................................................................................................................... B-14
B.85 SYSTem:FAN? Query ................................................................................................................................ B-14
B.86 0SYSTem:PFModule:DAMPing COMMAND.............................................................................................. B-14
B.87 SYSTem:PFModule:DAMPing? Query....................................................................................................... B-14
B.88 SYSTem:PFModule:LIST? Query .............................................................................................................. B-14
B.89 SYSTem:PFModule:STATus? Query......................................................................................................... B-15
B.90 SYSTem:RANGe:CURRent COMMAND ................................................................................................... B-16
B.91 SYSTem:RANGe:CURRent? Query .......................................................................................................... B-16
B.92 SYSTem:RANGe:POWer COMMAND....................................................................................................... B-16
B.93 SYSTem:RANGe:POWer? Query.............................................................................................................. B-16
B.94 SYSTem:Range:VOLTage COMMAND ..................................................................................................... B-16
B.95 SYSTem:Range:VOLTage? Query............................................................................................................. B-16
B.96 SYSTem:REPLY COMMAND .................................................................................................................... B-16
B.97 SYSTem:REPLY? Query ........................................................................................................................... B-17
B.98 SYSTem:SERNumber? Query ................................................................................................................... B-17
B.99 SYSTem:SETTings? Query........................................................................................................................ B-17
B.100 SYSTem:VERSion? QUERY...................................................................................................................... B-17
:CSUMmary:ENABle COMMAND................................................................................................. B-9
:OPERation:ENABle? Query ........................................................................................................ B-10
:OPERation:NTRansition Command ............................................................................................ B-10
:QUEStionable:CONDition? Query.......................................................................................... B-11
iv SERIES EL 070312
LIST OF FIGURES
FIGURE TITLE PAGE
1-1 Series EL Load ........................................................................................................................................... viii
2-1 Series EL, Front Panel Controls and Indicators .......................................................................................... 2-2
2-2 Series EL, Dual Model Front Panel Controls and Indicators....................................................................... 2-2
2-3 Series EL, Rear Panel Terminations and Connectors ................................................................................ 2-4
2-4 Series EL, Dual Models, Rear Panel Terminations and Connectors .......................................................... 2-4
2-5 Master Control Board Removal, Top View.................................................................................................. 2-7
2-6 Line Voltage Selection Jumper Orientation................................................................................................. 2-7
2-7 Typical Interconnections ............................................................................................................................. 2-9
2-8 Local Sensing Jumpers............................................................................................................................... 2-10
2-9 Typical Master/Slave Interconnections ....................................................................................................... 2-12
2-10 EL Load, Outline Dimension Drawing ......................................................................................................... 2-14
2-11 EL Load, Dual-Channel, Outline Dimension Drawing ................................................................................. 2-16
3-1 Example of Remote Operation.................................................................................................................... 3-8
3-2 Master/Slave Start-up, Computer Display................................................................................................... 3-9
3-3 Tree Diagram of SCPI Commands Used with Series EL Electronic Load .................................................. 3-14
3-4 Status Reporting Structure.......................................................................................................................... 3-17
3-5 Damping Measurement Setup .................................................................................................................... 3-20
3-6 Damping Waveforms .................................................................................................................................. 3-21
SERIES EL 070312
v/(vi Blank)
LIST OF TABLES
TABLE TITLE PAGE
1-1 Model Parameters .......................................................................................................................................1-2
1-2 Series EL Specifications .............................................................................................................................1-5
1-3 Mode Characteristics ..................................................................................................................................1-6
1-4 Equipment Supplied ....................................................................................................................................1-6
1-5 Accessories .................................................................................................................................................1-7
1-6 Safety Symbols ...........................................................................................................................................1-7
2-1 Front Panel Functions .................................................................................................................................2-3
2-2 Rear Panel Connections .............................................................................................................................2-5
3-1 Mode Selection and Adjustments ...............................................................................................................3-3
3-2 Remote Operation Command Summary .....................................................................................................3-11
3-3 Analog Programming Control Voltage Scale ..............................................................................................3-22
A-1 IEEE 488.2 Command/query Index ........................................................................................................... A-1
A-2 Standard Event Status Enable Register and Standard Event Status Register Bits ................................... A-1
A-3 Service Request Enable and Status Byte Register Bits ............................................................................. A-3
B-1 SCPI Subsystem Command/query Index .................................................................................................. B-1
B-2 Channel Status Condition, Enable, and Event Register Bits ..................................................................... B-8
B-3 Channel Summary Enable
and Event Register Bits ........................................................................................................................... B-9
B-4 Operation Condition Register, Operation Enable Register,
and Operation Event Register Bits .......................................................................................................... B-10
SERIES EL 020498 vii
FIGURE 1-1. SERIES EL LOAD
viii SERIES EL 070312
1.1 SCOPE OF MANUAL
This manual contains instructions for the installation, operation and service of the Series EL
Electronic loads manufactured by KEPCO, Inc., Flushing, New York, U.S.A., and applies to
units with Firmware Version and Unit Revision number indicated on the Title page. Firmware
Version is obtained in the response to *IDN? query. The Unit Revision number is visible on the
side of the unit, directly behind the top left side of the front panel (looking from the front).
DANGEROUS AND LETHAL POTENTIALS AND CURRENTS
ARE PRESENT, BOTH WITHIN THIS ELECTRONIC LOAD, AND
AT THE OUTPUT!
Before proceeding to use the electronic load, read this manual very carefully. Caution must be used when working with, and making connections
to, this load. Use only wires with the proper current rating and proper voltage rating for high voltage connections.
1.2 INTRODUCTION
The Series EL Electronic Loads (Figure 1-1) are modular, air-cooled, electronic loads. Typically
these loads are used to test DC power sources, such as batteries, power supplies, generators,
chargers, fuel cells etc.
SECTION 1 - INTRODUCTION
WARNING
Table 1-1 lists the rated power, voltage and current for Kepco’s Series EL electronic loads. For
example. Kepco Model 3K-600-90 Electronic Load uses 1000-volt devices allowing 600 volt
operation and is rated at a maximum current capability of 90 amperes and a power rating of
3000 Watts.
Model numbers with a D suffix indicate a dual-channel load. These models are comprised of two
identical independent loads within a single chassis.
1.3 GENERAL DESCRIPTION
The Series EL load system is comprised of two elements—the load and a control source. The
load dissipates power from the UUT—i.e. the source of electrical energy being tested by the
load. The source of control is either the load front panel or an external computer or other device
that can communicate using the interface protocols for which the Series EL is configured.
The load is rack-mountable. Local front panel control allows mode selection and provides: mode
indications; display of load current, voltage and power measurements; control parameter adjustment; local/remote control status; fault indications; and power on/off control of the load.
The load has high-current rear panel LOAD Terminals used to connect the UUT to the load,
analog control and monitoring terminals, master/slave communications connections, USB 2.0
and RS-232 connectors for remote control, and a mains power connector with fuse. The load
can also be configured with optional Ethernet or GPIB interfaces.
Values of load current, voltage and power, as well as fault information can be reported to a computer for display and analysis. SCPI-compliant commands transmitted to the load set the load
operating parameters. Special commands allow the user to configure the load measurement
system and to perform diagnostic tests.
SERIES EL 070312 1-1
Series EL electronic loads are designed for future expandability to accommodate increased
testing needs as user requirements grow. Any EL electronic load can be expanded to a full 5 kW
capability (with a commensurate increase in maximum current carrying capacity). Additionally,
the Series EL system can be expanded above the power/current limits defined in Table 1-1 by
adding up to 14 additional loads. These slave loads act in concert with a master load to increase
total power dissipation (and current handling).
TABLE 1-1. MODEL PARAMETERS
Operating Limits Overload Protection
Model number
EL 1K-50-100, D
EL 1K-200-100, D
EL 1K-400-70, D
EL 1K-600-30, D
EL 2K-50-200, D
EL 2K-200-200, D
EL 2K-400-140, D
EL 2K-600-60, D
EL 3K-25-400D
EL 3K-50-300 3000 50 300 3150 52.5 315 0.005
EL 3K-200-300 3000 200 300 3150 210 315 0.005
EL 3K-400-210 3000 400 210 3150 420 220.5 0.015
EL 3K-600-90 3000 600 90 3150 630 94.5 0.056
EL 4K-50-500 4000 50 500 4200 52.5 525 0.002
EL 4K-200-500 4000 200 500 4200 210 525 0.003
EL 4K-400-350 4000 400 350 4200 420 367.5 0.009
EL 4K-600-150 4000 600 150 4200 630 157.5 0.033
EL 5K-50-600 5000 50 600 5250 52.5 630 0.001
EL 5K-200-600 5000 200 600 5250 210 630 0.002
EL 5K-400-420 5000 400 420 5250 420 441 0.008
EL 5K-600-200 5000 600 200 5250 630 210 0.028
NOTES:
(1) Temperature protection: Per FET safe junction temperature.
(2) Maximum operating power and current may be reduced if a) ambient temperature exceeds 25°C or b) operating conditions
(ambient temperature, available air flow, etc.) cause internal load temperature to exceed safe operating conditions for FETs
(temperature fault).
(3) Maximum permissible voltage across ±LOAD terminals. This voltage should never be exceeded, regardless of load power or
load on/off states. Applied voltage must always be positive: +LOAD with respect to –LOAD.
(4) Each FET is individually fused. A blown fuse is reported as a Fault.
(5) D indicates model is also available as a Dual model. Dual models (D suffix) contain two identical and independent channels
in a single chassis; specifications listed are per channel for dual models.
(6) EL 3K-25-400D only available as dual model,
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)(6)
Rated
Power
(Watts)
1000 50 100 1050 52.5 105 0.008
1000 200 100 1050 210 105 0.014
1000 400 70 1050 420 73.5 0.046
1000 600 30 1050 630 31.5 0.017
2000 50 200 2100 52.5 210 0.004
2000 200 200 2100 210 210 0.007
2000 400 140 2100 420 147 0.023
2000 600 60 2100 630 63 0.083
3000 50 400 2400 52.5 420 0.004
Rated
Vol tag e
(Volts)
Rated Current
Max (any Mode)
(Amperes)
Power
(Watts)
(2)
Vol tag e
(Volts)
(3)
(1)
Current
(Amps)
(2)(4)
Minimum On
Resistance
Short Mode
(Ohms)
1-2 SERIES EL 070312
1.4 OPERATING MODES
The load operates in one of six modes. Each mode is subject to independent limits for maximum
load current, power, voltage and frequency. Current draw does not occur until the load is turned
ON (engaged with) the Unit Under Test (UUT).
1.4.1 CI (CONSTANT CURRENT).
The current drawn by the load from the UUT remains at a constant value defined by the user.
1.4.2 CV (CONSTANT VOLTAGE)
The current drawn by the load from the UUT varies as required to cause the UUT voltage to
decrease to the voltage defined by the user. Operation in CV mode requires sufficient source
resistance in the UUT so voltage drops in the UUT allow the desired voltage control.
1.4.3 CP (CONSTANT POWER)
The current drawn by the load from the UUT varies as required to cause a constant amount of
power defined by the user to be dissipated by the load, where power is defined as the product of
UUT voltage and current drawn by the load.
1.4.4 CR (CONSTANT RESISTANCE)
The current drawn by the load from the UUT varies as required to cause a constant resistance
(UUT voltage divided by load current) defined by the user.
1.4.5 CS (CONSTANT CONDUCTANCE)
The current drawn by the load from the UUT varies as required to cause a constant conductance (UUT current divided by load voltage) defined by the user.
1.4.6 SHORT
The current drawn by the load is the maximum possible by the load; load resistance is minimum
ON (see Table 1-2). CAUTION: There is no user adjustment of the current in the SHORT
mode—use caution!
1.4.7 OFF
No current is drawn by the load even when the load is turned ON.
1.5 FEATURES
1.5.1 LOCAL CONTROL
Three 4-digit, 7-segment LED displays and six individual LEDs on the front panel show operating status. A rotary encoder (CONTROL) allows the user to adjust the selected load parameter,
define the resolution of the rotary encoder and to select the operating mode. An illuminated
momentary pushbutton switch (LOAD) allows the user to alternately a) engage the load, allowing the source or Unit Under Test (UUT) to draw current and b) disengage the load, stopping
current flow. An integral indicator within the LOAD switch changes color to show the load connection status and indicate a fault condition if one exists.
SERIES EL 070312 1-3
1.5.2 REMOTE CONTROL
Remote control of the Series EL Electronic Load is accomplished from a remote device using
SCPI commands and either RS 232 or USB protocols. GPIB (G suffix) or LAN (E suffix) protocols are available as an option. The RS 232 and USB ports cannot be turned off, therefore the
Series EL can always be controlled via these ports. Digital commands expand the control available from the front panel, and include damping when required for square wave or pulse type
requirements, overvoltage, undervoltage, overcurrent and overpower protections.
1.5.3 ANALOG PROGRAMMING
An analog input is provided via the 15-pin ANALOG CONTROL connector at the rear that allows
the user to use a 10V analog signal to control the voltage, current or power, depending on the
mode selected. See PAR 3.15 for details.
1.5.4 DIGITAL CALIBRATION
Internal adjustments of the Series EL Electronic Load are automatic. Calibration can be performed remotely via one of the remote interfaces.
1.5.5 DAMPING
Typical operation for an electronic load involves the flow of high currents. The combination of
high, rapidly changing currents and the inductance associated with connections to the load via
lead wires can cause unexpected results, such as very high voltage spikes, oscillation or severe
ringing (damped oscillations) at the source. To help reduce these issues, the Series EL offers
multiple forms and degrees of damping, allowing the best measurements possible. See PAR.
3.14 for details.
1.5.6 BUILT-IN PROTECTION
• Overtemperature. Thermal management of the EL Series is accomplished by continually
monitoring the temperature of each individual power-dissipating MOSFET. If the temperature of a MOSFET begins to approach a dangerous level, then its power will be
reduced and the other MOSFETs will naturally increase their share via the control loops.
If the temperature of one or more of the MOSFETs exceeds safe operating limits, this
may cause either a reduction of the load maximum current/power handling ability or a
complete inability to use the load depending on the degree of overheating.
• The user can establish limits for overvoltage or undervoltage, overcurrent, or power
which can not be exceeded at the input. If the limits are exceeded, the unit disengages
from the UUT and a fault indication is displayed (see PAR. 3.3.1 for details).
1.5.7 MASTER/SLAVE CONTROL
For configurations that require power or current in excess of the maximum available from a single unit, additional units can be added to the system to increase power/current capability, up to a
maximum of 14 additional units.
1-4 SERIES EL 070312
1.6 SPECIFICATIONS
Parameters unique to different models of Series EL loads are listed in Table 1-1. Specifications
common to all Series EL models are listed in Table 1-2.
TABLE 1-2. SERIES EL SPECIFICATIONS
SPECIFICATION RATING/DESCRIPTION CONDITION/COMMENT
MODE CHARACTERISTICS
Linearity vs. programming command See Table 1-3
Regulation
Resolution (via computer control) 14 Bits 5 – 100% of Full Scale
Current readback
(Current mode)
Parameter readback
(Current and Voltage)
(1) See Table 1-3
Computer Accuracy: ±0.25%
Computer Resolution: ±15 Bits 5 – 100% of Full Scale
Accuracy: ±0.25% (±1% for 50V models)
Resolution: ±15 Bits
Temperature
coefficient:
100 ppm/°C
5 – 100%; accuracy is % of Full Scale value
5 – 100%; regulation is % of Full Scale value
5 – 100%; accuracy is % of Full Scale value
Accuracy is % of Full Scale value
(2)
(2)
(2)
CONTROL CHARACTERISTICS
USB Interface Uses IEEE 488.2 and SCPI
commands and queries.
RS 232 Interface Uses IEEE 488.2 and SCPI
commands and queries.
GPIB Interface Uses IEEE 488.2 and SCPI
commands and queries.
Ethernet Interface Uses IEEE 488.2 and SCPI
commands and queries.
Requires driver.
Baud rate: 38400
Parity: None
Data Bits: 8
Stop Bits: 1
Flow Control: None
Optional. GPIB address 10 = default
Optional.
INPUT IMPEDANCE
EL 1K Models 161K Ohms
EL 2K Models 80K Ohms
EL 3K Models 54K Ohms
EL 4K Models 38K Ohms
EL 5K Models 26K Ohms
GENERAL CHARACTERISTICS
a-c Line Power Input 120 VAC ±10%, 50/60 Hz or
240 VAC ±10%, 50/60 Hz
Cooling Forced Air (400 CFM) Variable speed fans, cooling determined by load
Operating Temperature
Dimensions (load) 19”W x 7”H x 24.5”D See Figure 2-10.
Weight (load) 88 lbs.
Storage Requirements –20 to +60°C, 15 to 80% RH Relatively dust free environment.
NOTES:
(1) Regulation specified after 15 minutes of operation at set power level. (2) Accuracy and regulation are valid from 5% to 100% of
the rated value. The accuracy (e.g., ±0.25% of a constant current setpoint) is ±0.25% of the full scale value and not the setpoint.
(3) For 240V configuration of dual-channel models, contact Kepco.
0°C to 40°C
120V is factory default; 240V requires internal
configuration
demand.
(3)
(see PAR 2.3.1)
(2)
SERIES EL 070312 1-5
MODE Linearity Vs. Programming Command Regulation
Constant Current ±0.25% ±0.25%
Constant Power ±2% ±1%
Constant Voltage ±0.25% (±1% for 50V models) ±0.25%
Constant Resistance ±1% ±1%
Constant Conductance ±1% ±1%
(1) Regulation specified after 15 minutes of operation at set power level
1.7 EQUIPMENT SUPPLIED
Equipment supplied with the unit is listed in Table 1-4.
TABLE 1-3. MODE CHARACTERISTICS
(1)
TABLE 1-4. EQUIPMENT SUPPLIED
ITEM
Source Power cable 118-1234
Series EL Quick Start Guide * 228-1687 1
EL Series (except Dual models) ±LOAD terminal hardware
Screw, Cap, Hex, Silicon bronze, 3/8-16 (coarse thread) x 1 in.
Nut, Hex, silicon bronze, 3/8-16
Washer, split, silicon bronze, 3/8
Washer, flat, silicon bronze, 3/8
EL Series Dual models ±LOAD terminal hardware
Screw, Cap, Hex, Silicon bronze, 3/8-16 (coarse thread) x 1 in.
Nut, Hex, silicon bronze, 3/8-16 (Dual load only)
Washer, split, silicon bronze, 3/8 (Dual load only)
Washer, flat, silicon bronze, 3/8 (Dual load only)
Ground stud hardware
Wingnut, 1/4-20, 18-8 stainless-steel
Washer, Flat, 1/4 in., 18-8 stainless-steel
Washer, split, 1/4 in., 18-8 stainless-steel
Nut, 1/4-20, 18-8 stainless-steel
Chassis slide mounting screws, 10-32 x 1/4 in. (installed in chassis slide
mounting holes; replace screws provided with chassis slides which must
be discarded)
Fuse 3A, SB (installed in fuseholder on rear panel.) 141-0129
PART NUMBER QUANTITY
(Unicable 3850-761-BB/G)
101-0507
102-0182
103-0196
103-0197
101-0507
102-0182
103-0196
103-0197
102-0190
103-0201
103-0204
102-0188
101-0531 7
(Littelfuse 0313003.HXP)
1
2
2
2
4
4
4
4
8
1
2
1
1
1
* Series EL USB Driver Manual and Series EL Operator Manual are available for free download from the Kepco website
at www.kepcopower.com/support/opmanls.htm#e
Series EL Drivers are available for free download at www.kepcopower.com/drivers/drivers-dl3.htm#el
1-6 SERIES EL 070312
1.8 ACCESSORIES
Accessories for the Series EL Electronic Load are listed in Table 1-5.
1.9 OPTIONS
The G option (suffix G added to model number) includes the GPIB interface. For single units the
GPIB interface is in addition to the standard RS 232 and USB interfaces. For dual units the
GPIB interface replaces the standard RS 232 and USB interfaces.
The E Option (suffix E added to model number) includes the Ethernet (LAN) interface in addition
to the standard RS 232 and USB interfaces.
Dual Channel models are identified by a D Suffix. These models contain two identical independent loads in one chassis.
1.10 SAFETY
There are no
operator serviceable parts inside the case. Service must be referred to authorized
personnel. Using the load in a manner not specified by Kepco, Inc. may impair the protection
provided by the load. Observe all safety precautions noted throughout this manual. Table 1-6
lists symbols used on the electronic load or in this manual where applicable.
TABLE 1-5. ACCESSORIES
ITEM FUNCTION
RJ 22 Master/Slave cable, 1 ft.
(See Note.)
Fuse 1.5A, SB Required for units configured to run from 240V a-c
Slides (pair) Allows the unit to slide out of a rack. see PAR. 2.5.2.) CS 06
Side Support bracket Pair required. Used to provide side support for EL
NOTE: For units that use slide mounting, consult Kepco for longer cable lengths.
Daisy chains Series EL loads with the same voltage for
parallel configurations.
source power.
Load. Requires rear rail at 18-13/16 in. setback.
KEPCO
PART NUMBER
118-1245
141-0031
(LittelFuse
31301.5)
128-1775
TABLE 1-6. SAFETY SYMBOLS
SYMBOL MEANING
CAUTION: RISK OF ELECTRIC SHOCK.
CAUTION: REFER TO REFERENCED PROCEDURE.
!
WARNING INDICATES THE POSSIBILITY OF BODILY INJURY OR DEATH.
CAUTION INDICATES THE POSSIBILITY OF EQUIPMENT DAMAGE.
SERIES EL 070312 1-7/1-8 Blank)
SECTION 2 - INSTALLATION
2.1 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 2.5. If any indication of damage is
found, file an immediate claim with the responsible transport service.
2.2 TERMINATIONS AND CONTROLS
2.2.1 FRONT PANEL CONTROLS AND INDICATORS. Three 4-digit, 7-segment LED displays and
six individual LEDs on the front panel show operating status as shown in Figure 2-1 or Figure 2-
2. A rotary encoder (CONTROL) allows the user to: a) adjust the selected load parameter, b)
define the resolution of the rotary encoder, c) select the operating mode. A momentary pushbutton switch (LOAD) with integral LED indicator allows the user to alternately a) engage the load,
allowing the source or Unit Under Test (UUT) to draw current and b) disengage the load, stopping current flow. The LOAD LED indicator colors show the load connection status and indicate
a fault condition if one exists.
Figure 2-1 shows the front panel of standard units; Figure 2-2 shows the front panel of dualchannel units. Table 2-1 presents the functions of all front panel controls and indicators. Front
panel controls listed in Table 2-1 are duplicated for identical (but independent) channels A and B
of the dual-channel units, with the exception of the single POWER switch which applies to both
channels.
2.2.2 REAR PANEL CONNECTIONS. Figure 2-3 shows the rear panel of standard single-channel units; figure 2-4 shows the rear panel of dual-channel units. Table 2-2 presents the functions of all rear panel connections. Rear panel connections listed in Table 2-2 are duplicated for identical (but independent) channels A and B of the dual-channel units, with the exception of the single power inlet connector and fuse which apply to both channels.
SERIES EL 070312 2-1
NOTE: See Table 2-1 for callout descriptions.
FIGURE 2-1. SERIES EL, FRONT PANEL CONTROLS AND INDICATORS
NOTE: See Table 2-1 for callout descriptions.
FIGURE 2-2. SERIES EL, DUAL MODEL FRONT PANEL CONTROLS AND INDICATORS
2-2 SERIES EL 070312
TABLE 2-1. FRONT PANEL FUNCTIONS
SEE
FIG. 2-1
OR 2-2
1 AMPS display Displays the load test current in Amps (factory default setpoint (see NOTE): 0 Amps) or test current
2 CR indicator On (solid) indicates Constant Resistance Mode; factory default setpoint (see NOTE): 1000 Ohms.
3 CI indicator On to indicate Constant Current Mode.
4 CV indicator On to indicate Constant Voltage Mode (factory default setpoint (see NOTE): maximum load voltage).
5 CP indicator On to indicate Constant Power Mode (factory default setpoint (see NOTE): 0 kilowatts.
6 Power ON/OFF
7 LAN indicator Green LED on when Ethernet control is active.
8 LOCAL indicator Red LED on when front panel controls are active.
9 CONTROL
10 LOAD
11 KW display Displays the power (Amps x Volts) being dissipated by the load in kilowatts. Also indicates resis-
12 VOLTS display Displays test voltage from UUT applied to the load in Volts. May also display blinking FAL7 which
NOTE:
Factory defaults refer to setpoints for the measurement displayed. These factory default setpoints are designed to ensure that no
current is drawn from the UUT when the load is engaged without further adjustment of these parameters. The EL Series load maintains individual setpoints for each mode. These are stored in non-volatile memory, however the factory default setpoints can be
restored by issuing *RST command over a remote interface.
COMPONENT FUNCTION
setpoint in Amps. May also display blinking FAL7 to indicate Current Fault (sets input to OFF).
CAUTION: Short mode is selected when CR, CI, CV and CP indicators all blink.
On (blinking with other Mode indicators off) indicates Constant Conductance Mode; factory default
setpoint: 1mS (0.001 siemens, I/E).
switch
rotary encoder/
pushbutton
switch
momentary
pushbutton
switch/indicator
Rocker switch: press top half to turn power on, bottom half to turn power off. NOTE: Cycling power
switch from ON to OFF to ON resets fault conditions, but does not reset setpoints (sse NOTE).
When LOCAL is active, Four functions are available as follows:
a. Select Mode: Press and hold until Mode indicators and LOAD pushbutton indicator start blinking.
Release and rotate knob to select mode indicated by the CI, CR, CV and CP indicators (see Table 3-
1). LOAD indicator off while selecting mode. To make a selection either (1) press and hold knob until
indicators stop blinking, (2) wait one minute, or (3) press LOAD button to exit selection process.
b. Set Value: Rotate knob to adjust the level of the controlled parameter: current, voltage, resistance, conductance or power (see Table 3-1). Rotate clockwise to increase, counterclockwise to
decrease. Settings are stored and will be available at next power-up.
c. Select Digit: Momentarily press knob to select one digit (blinks). Convenience function allows
adjustment at desired resolution.
d. Show settings: When Mode is set to OFF, rotating CONTROL while LOAD switch is blinking
green and depressed displays Model number, Serial number, IP address, etc. (see PAR. 3.7).
Switch used to alternately enable (load engaged) or disable (load disengaged) the ability of the load
to draw current from the UUT. Indicator lights to show load status:
Green (steady): Standby - Ready to operate; load does not draw current from the UUT. Parameter
displays show voltage, current and power setpoints when CONTROL is momentarily depressed.
Green (blinking): Modes set to off (CR, CI, CV, CP all off), Load can not be engaged. Load configuration information is displayed.
Amber: Engaged - The load is able to draw current from the UUT, however current may or may not
be flowing depending on the setpoint settings. Parameter displays show actual voltage, current and
power.
Red (blinking): Fault - The load does not draw current from the UUT. The nature of the fault is
shown in the appropriate 7-segment display (see PAR.3.3.1) NOTE: The fault condition must be corrected before the load can be engaged; press LOAD switch to change indication to Standby (green)
after fault is corrected.
Off (not lit): Mode selection using CONTROL is in progress.
tance (in Ohms) or conductance (in Siemens) settings. May also display blinking FAL7 to indicate
Power Fault. May also display blinking HO7 to indicate the unit has started to fold back the output
because the internal temperature sensors have detected FET temperature in excess of 130°C.
either alternates with Undr to indicate Undervoltage Fault or alternates with QuEr to indicate Overvoltage Fault (either fault sets input to OFF).
SERIES EL 070312 2-3
NOTE: See Table 2-2 for callout descriptions.
FIGURE 2-3. SERIES EL, REAR PANEL TERMINATIONS AND CONNECTORS
NOTE: See Table 2-2 for callout descriptions.
FIGURE 2-4. SERIES EL, DUAL MODELS, REAR PANEL TERMINATIONS AND CONNECTORS
2-4 SERIES EL 070312
TABLE 2-2. REAR PANEL CONNECTIONS
FIG. 2-3 or 2-4
INDEX NO.
1 120VAC 50/60HZ/
2 FUSE FUSE: 120 V, 3AG, 3 Ampere Slo Blow (or 240V, 3AG, 1.5
3LOAD (–)
4LOAD (+)
5 SENSE
6 ANALOG
7 LAN Optional Ethernet connector.
8 MSTR (MSTR-O on D models)
9 RS-232
10 USB
11 SL-I (SL I/O on D models)
12 SL-O (SL I/O on D models)
13 GPIB
NAME DESCRIPTION
250VAC 50/60HZ/
Bus bar
Bus bar
terminals
CONTROL
DB 15 Connector
Master Out
connector
connector
connector
Slave In/Out
connector
Slave In/Out
connector
IEEE 488 connector
POWER: IEC 60320-C13 line cord connector to connect
mains power (either 120 VAC 50/60 Hz or optional 240V AC
50/60 Hz). NOTE: changing mains power voltage requires
internal connector changes (see PAR. 2.3.1).
Ampere Slo Blow)
UUT Connections. (–) Negative and (+) Positive: High current connections to UUT. Connections to ±LOAD are typically
made using the supplied 3/8” low-resistance hardware (2
sets: bolt, nut and lockwasher).
+S and –S terminals used for remote sensing. Install Jumpers between – and -S and between + and +S for local sensing. Either local or remote sensing must be connected for
unit to operate. See 2.6.2.2 for details.
Analog programming connections. Used for analog programming input/output signals. See 2.6.4 for details.
Standard RS-522 connector. Connects from Master Out to
Slave In (SL-I or SL I/O) for multiple units in parallel (see Figure 2-9). See PAR. 3.16 for master/slave configurations. See
Table 1-5 to order RJ 22 master/slave cable.
Standard RS-232. Connects with a remote device using RS
232 protocols and SCPI commands (see Figure 2-3).
Connection to remote device for command, monitoring or
calibration. Use USB connector of master to communicate
with multiple loads in a master/slave configuration. (see Figure 2-7).
Standard RS-522 connector. Connects Slave to next slave
SL-O to SL-I (SL I/O to SL I/O on D models) if unit is a slave
in a parallel configuration using more than two units. Only
use Kepco cable (see Table 1-5) for master/slave connections (Figure 2-9).
Standard RS-522 connector. Connects Slave to next slave
SL-O to SL-I (SL I/O to SL I/O on D models) if unit is a slave
in a parallel configuration using more than two units. Only
use Kepco cable (see Table 1-5) for master/slave connections (Figure 2-9).
Optional. When installed, connects user GPIB card with EL
load using standard GPIB cable (not supplied).
2.3 MAINS POWER REQUIREMENTS
The Electronic Load is delivered configured for operation from 120V a-c ±10%, 50/60 Hz. If the
load is to be operated from a 240V a-c ±10%, 50/60 Hz power source, or the input power range
needs to be changed from a previous selection, see PAR 2.3.1 to change mains power
CAUTION: The Series EL electronic loads do not have 120/240V automatic line voltage
switching. Applying 240V a-c to a load configured for 120V a-c will damage
the load.
SERIES EL 070312 2-5
2.3.1 CHANGING MAINS POWER VOLTAGE
The load can be operated from either 120V a-c, ±10%, 50/60 Hz or 240V a-c, ±10% 50/60 Hz.
To change from one mains operating voltage to the other requires repositioning of line voltage
selection jumpers located on the Master Control Board and must be done only by authorized
personnel. NOTE: Carefully tag and retain all attaching hardware for use during reassembly.
NOTE: Conversion of Dual Channel Models (D suffix) from 120V a-c to 240V a-c is not autho-
rized; please contact factory for assistance.
1. Disconnect all line voltage sources and UUT sources.
2. Open the load cabinet by removing the top cover as described below:
a. Loosen and remove five screws holding the top cover to the load on each side.
b. Loosen and remove four nuts holding the top cover to the load rear panel. The top
cover is held in place by four threaded studs.
c. Loosen and remove four screws holding the top cover to the load front panel. For ease
of removal, use a non-metallic support tool through the front panel vertical ventilation
slots to support the top cover as the screws are removed. With the screws removed,
the tool can be used to elevate the top cover above the front panel so it can be grasped
and removed from the load.
3. Refer to Figure 2-5 and remove the Master Control Board as follows:
a. Unplug 10-pin ribbon cable at top of Master Control Board.
b. Unplug 16-pin ribbon cable from Front Panel Display Board at top of chassis.
c. Unplug front and rear fan connectors from Master Control Board.
d. From outside of side panel, remove four Allen Head screws holding the Master Control
Board mounting plate to the load side panel.
e. To allow the transformer on the Master Control Board clearance it is necessary to
remove one Power FET Module (PFM) board (see Figure 2-5). Disconnect two PFM
board interconnection cables, then remove four groups of four screws (each with one
flat washer and one lockwasher) and two sets of brass nuts (each with one flat washer
and one lockwasher).
f. Raise Master Control Board assembly until the two small black mains voltage selection
jumpers are visible (see Figure 2-6). NOTE: It may be necessary to remove nut securing wire strap holding front fan connector wires to fully remove board.
4. Using long-nosed pliers, remove the jumpers and relocate them to the desired position (see
Figure 2-6). NOTE: Two jumpers used for 120V a-c operation, only one jumper used for
240V a-c operation.
5. Reassemble the load by reversing the above steps. CAUTION: When reinstalling the
PFM Board, it is important to torque all screws and nuts to 1.5Nm (13.8 in-lb).
6. Change the mains fuse to correspond to the type and rating suitable for the selected mains
voltage operation (see Figure 2-3).
2-6 SERIES EL 070312
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