AMETEK SLM Series RevC User Manual

SLM Series Plug-in DC

Electronic Load

Module

Operating Manual

M540071-01 Rev C www.programmablepower.com

About AMETEK

AMETEK Programmable Power, Inc., a Division of AMETEK, Inc., is a global leader in the design and manufacture of precision, programmable power supplies for R&D, test and measurement, process control, power bus simulation and power conditioning applications across diverse industrial segments. From bench top supplies to rack-mounted industrial power subsystems, AMETEK Programmable Power is the proud manufacturer of Elgar, Sorensen, California Instruments and Power Ten brand power supplies.

AMETEK, Inc. is a leading global manufacturer of electronic instruments and electromec hanical devices with annualized sales of $2.5 billion. The Company has over 11,000 colleagues working at more than 80 manufacturing facilities and more than 80 sales and service centers in the United States and around the world.

Trademarks

AMETEK is a registered trademark of AMETEK, Inc. Other trademarks, registered trademarks, and product names are the property of their respective owners and are used herein for identification purposes only.

Notice of Copyright

SLM Series Plug-in DC Electronic Load Module Operating Manual

Exclusion for Documentation

UNLESS SPECIFICALLY AGREED TO IN WRITING, AMETEK PROGRAMMABLE POWER, INC. (“AMETEK”):

(a) MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY OF ANY

TECHNICAL OR OTHER INFORMATION PROVIDED IN ITS MANUALS OR OTHER DOCUMENTATION.

(b) ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSSES, DAMAGES, COSTS OR

EXPENSES, WHETHER SPECIAL, DIRECT, INDIRECT, CONSEQUENTIAL OR INCIDENTAL, WHICH MIGHT ARISE OUT OF THE USE OF SUCH INFORMATION. THE USE OF ANY SUCH INFORMATION WILL BE ENTIRELY AT THE USER’S RISK, AND

ALTHOUGH STEPS HAVE BEEN TAKEN TO MAINTAIN THE ACCURACY OF THE TRANSLATION, THE ACCURACY CANNOT BE GUARANTEED. APPROVED AMETEK CONTENT IS CONTAINED WITH THE ENGLISH LANGUAGE VERSION, WHICH IS POSTED AT WWW.PROGRAMMABLEPOWER.COM.

Date and Revision

August 2008 Revision C

Part Number

M540071-01

Contact Information

Telephone: 800 733 5427 (toll free in North America) 858 450 0085 (direct) Fax: 858 458 0267 Email: sales@programmablepower.com service@programmablepower.com Web: www.programmablepower.com

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Important Safety Instructions

Before applying power to the system, verify that your product is configured properly for your particular application.

WARNIN

Only qualified personnel who deal with attendant hazards in power supplies, are allowed to perform installation and servicing.

Ensure that the AC power line ground is connected properly to the Power Rack input connector or chassis. Similarly, other power ground lines including those to application and maintenance equipment must be grounded properly for both personnel and equipment safety.

Always ensure that facility AC input power is de-energized prior to connecting or disconnecting any cable.

In normal operation, the operator does not have access to hazardous voltages within the chassis. However, depending on the user’s application configuration, HIGH VOLTAGES HAZARDOUS TO HUMAN SAFETY may be normally generated on the output terminals. The customer/user must ensure that the output power lines are labeled properly as to the safety hazards and that any inadvertent contact with hazardous voltages is eliminated.

Guard against risks of electrical shock during open cover checks by not touching any portion of the electrical circuits. Even when power is off, capacitors may retain an electrical charge. Use safety glasses during open cover checks to avoid personal injury by any sudden component failure.

Neither AMETEK Programmable Power Inc., San Diego, California, USA, nor any of the subsidiary sales organizations can accept any responsibility for personnel, material or inconsequential injury, loss or damage that results from improper use of the equipment and accessories.

Hazardous voltages may be present when covers are removed. Qualified personnel must use extreme caution when servicing this equipment. Circuit boards, test points, and output voltages also may be floating above (below) chassis ground.

The equipment used contains ESD sensitive ports. When installing equipment, follow ESD Safety Procedures. Electrostatic discharges might cause damage to the equipment.

SAFETY SYMBOLS

iii

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Product Family: SLM Series Plug-in DC Electronic Load Module

Warranty Period: One Year

WARRANTY TERMS

AMETEK Programmable Power, Inc. (“AMETEK”), provides this written warranty covering the Product stated above, and if the Buyer discovers and notifies AMETEK in writing of any defect in material or workmanship within the applicable warranty period stated above, then AMETEK may, at its option: repair or replace the Product; or issue a credit note for the defective Product; or provide the Buyer with replacement parts for the Product.

The Buyer will, at its expense, return the defective Product or parts thereof to AMETEK in accordance with the return procedure specified below. AMETEK will, at its expense, deliver the repaired or replaced Product or parts to the Buyer. Any warranty of AMETEK will not apply if the Buyer is in default under the Purchase Order Agreement or where the Product or any part thereof:

• is damaged by misuse, accident, negligence or failure to maintain the same as

specified or required by AMETEK;

• is damaged by modifications, alterations or attachments thereto which are not

authorized by AMETEK;

• is installed or operated contrary to the instructions of AMETEK;

• is opened, modified or disassembled in any way without AMETEK’s consent; or

• is used in combination with items, articles or materials not authorized by AMETEK.

The Buyer may not assert any claim that the Products are not in conformity with any warranty until the Buyer has made all payments to AMETEK provided for in the Purchase Order Agreement.

PRODUCT RETURN PROCEDURE

1. Request a Return Material Authorization (RMA) number from the repair facility (must be done in the country in which it was purchased):

• In the USA, contact the AMETEK Repair Department prior to the return of the

product to AMETEK for repair: Telephone: 800-733-5427, ext. 2295 or ext. 2463 (toll free North America)

858-450-0085, ext. 2295 or ext. 2463 (direct)

• Outside the United States, contact the nearest Authorized Service Center

(ASC). A full listing can be found either through your local distributor or our website, www.programmablepower.com, by clicking Support and going to the Service Centers tab.

2. When requesting an RMA, have the following information ready:

• Model number

• Serial number

• Description of the problem

NOTE: Unauthorized returns will not be accepted and will be returned at the shipper’s expense. NOTE: A returned product found upon inspection by AMETEK, to be in specification is subject to

an evaluation fee and applicable freight charges.

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Important Safety Instructions

This manual has been written expressly for the Sorensen brand SL series of electronic loads, which have been designed and certified to meet the Low Voltage and Electromagnetic Compatibility Directive Requirements of the European Community.

Since the goal of the Low Voltage Directive is to ensure the safety of the equipment operator, universal graphic symbols have been used both on the unit itself and in this manual to warn the operator of potentially hazardous situations (see Safety Symbols on page ii).

CONTENTS

SECTION 1 Introduction, Features and Specifications ...........................................................1-1

1.1 GENERAL DESCRIPTION .....................................................................................................................1-1

1.1.1 POWER CONTOURS.............................................................................................................. 1-1

1.1.2 OPERATING MODES .............................................................................................................1-4

1.2 FEATURES...............................................................................................................................................1-7

1.2.1 ACCESSORIES........................................................................................................................1-7

1.3 MODULE SPECIFICATIONS .................................................................................................................1-8

1.4 REGULATORY COMPLIANCE.............................................................................................................1-9

1.5 BLOCK DIAGRAM..................................................................................................................................1-9

SECTION 2 Installation and Maintenance.................................................................................2-1

2.1 INSTALLATION AND REMOVAL OF SLM-SERIES DC PLUG IN MODULE..............................2-2

2.1.1 INSTALLATION ........................................................................................................................2-2

2.1.2 REMOVAL .................................................................................................................................2-3

2.2 CONNECTIONS.......................................................................................................................................2-3

2.2.1 INPUT BINDING POST AND WIRE CONSIDERATIONS .................................................2-3

2.2.2 TYPICAL CONNECTIONS .....................................................................................................2-4

2.2.3 THE CONNECTION FOR A MULTIPLE OUTPUT POWER SUPPLY ............................2-4

2.3 MAINTENANCE.......................................................................................................................................2-5

2.3.1 CLEANING AND STORAGE ..................................................................................................2-5

SECTION 3 Operation.................................................................................................................3-1

3.1 FRONT PANEL CONTROLS AND INDICATORS.............................................................................3-1

3.1.1 DESCRIPTION ......................................................................................................................... 3-1

3.1.2 SUMMARY CHART .................................................................................................................3-6

3.2 OPERATION – SETUP AND OCP/OPP TESTS................................................................................3-7

3.2.1 OVERVIEW OF FRONT PANEL OPERATION................................................................... 3-7

3.2.2 INITIAL SETUP (LIMIT KEY).................................................................................................. 3-7

3.2.3 NORMAL OPERATING MODES .........................................................................................3-11

3.2.4 INITIAL SETTING OF SLM-SERIES DC LOAD MODULES ...........................................3-16

3.2.5 ANALOG PROGRAMMING INPUT.....................................................................................3-16

3.2.6 LOAD COARSE/FINE INCREASE/DECREASE ADJUSTMENT KEY ..........................3-17

3.2.7 I-MONITOR .............................................................................................................................3-18

3.2.8 PROTECTION FEATURES ..................................................................................................3-19

SECTION 4 Applications.............................................................................................................4-1

4.1 LOCAL SENSE CONNECTIONS..........................................................................................................4-1

4.2 REMOTE SENSE CONNECTIONS ......................................................................................................4-2

4.3 CONSTANT CURRENT (CC) MODE APPLICATION.......................................................................4-3

4.3.1 STATIC MODE: ........................................................................................................................4-3

4.3.2 DYNAMIC MODE: ....................................................................................................................4-4

4.4 CONSTANT VOLTAGE (CV) MODE APPLICATION .......................................................................4-5

4.5 CONSTANT RESISTANCE (CR) MODE APPLICATION.................................................................4-6

4.6 CONSTANT POWER (CP) MODE APPLICATION............................................................................4-7

4.7 PARALLEL OPERATION ......................................................................................................................4-8

SECTION 5 Remote Programming.............................................................................................5-1

5.1 GPIB COMMANDS ..................................................................................................................................5-1

5.2 RS-232 INTERFACE AND COMMANDS ............................................................................................5-1

5.3 GPIB/RS-232C COMMAND LIST.........................................................................................................5-2

5.3.1 COMMAND SYNTAX ABBREVIATIONS ............................................................................. 5-2

5.4 GPIB/RS-232 COMMAND DESCRIPTION .........................................................................................5-7

5.4.1 SETTING COMMANDS ..........................................................................................................5-7

5.4.2 QUERY COMMANDS............................................................................................................5-20

APPENDIX A SLM-SERIES DC LOAD GPIB/RS-232 OPERATING FLOW CHART......A

LIST of TABLES

TABLE 1-1 SLM-SERIES DC LOAD MODULE SPECIFICATION ................................................................................. 1-8

TABLE 3-1 SLM-SERIES DC ELECTRONIC LOAD FACTORY SETTINGS FOR POWER ON ............................3-16

TABLE 3-2 RESOLUTION OF RANGE 1/2 VS COARSE/FINE LOAD CURRENT SETTING KEYS ....................3-18

vii

TABLE 3-3 SUMMARY OF OVER PROTECTION VALUES.........................................................................................3-20

TABLE 5-1 GPIB COMMAND TERMINATOR.................................................................................................................. 5-3

TABLE 5-2 GPIB/RS-232 SETTING COMMAND SUMMARY....................................................................................... 5-4

TABLE 5-3 GPIB/RS-232 PRESET QUERY COMMAND SUMMARY WITH APPLICABLE MODULE TYPES .... 5-4

TABLE 5-4 STATE COMMAND SUMMARY..................................................................................................................... 5-5

TABLE 5-5 SYSTEM COMMANDS - ALL MODULES .................................................................................................... 5-6

TABLE 5-6 MEASURE AND LIMIT COMMANDS............................................................................................................ 5-6

TABLE 5-7 GLOBAL COMMANDS .................................................................................................................................... 5-6

TABLE 5-8 WAVEFORM INFORMATION .......................................................................................................................5-14

LIST of FIGURES

FIGURE 1-1 SLM-60-30-150 POWER CONTOUR ......................................................................................................... 1-1

FIGURE 1-2 SLM-60-60-300 POWER CONTOUR ......................................................................................................... 1-2

FIGURE 1-3 SLM-250-10-300 POWER CONTOUR ....................................................................................................... 1-2

FIGURE 1-4 SLM-500-10-300 POWER CONTOUR ....................................................................................................... 1-3

FIGURE 1-5 SLM-60-15-75 POWER CONTOUR............................................................................................................ 1-3

FIGURE 1-6 CONSTANT CURRENT (CC) MODE.......................................................................................................... 1-4

FIGURE 1-7 CONSTANT RESISTANCE (CR) MODE.................................................................................................... 1-4

FIGURE 1-8 CONSTANT VOLTAGE (CV) MODE .......................................................................................................... 1-5

FIGURE 1-9 CONSTANT POWER (CP) MODE .............................................................................................................. 1-5

FIGURE 1-10 DYNAMIC WAVEFORM ............................................................................................................................. 1-6

FIGURE 1-11 BLOCK DIAGRAM OF SLM-SERIES DC ELECTRONIC LOAD.......................................................... 1-9

FIGURE 2-1 BINDING POST AND SCREW ON SLM-SERIES DC PLUG-IN LOAD MODULE .............................. 2-1

FIGURE 2-2 PLUG-IN INSTALLATION AND REMOVAL............................................................................................... 2-2

FIGURE 2-3 TYPICAL CONNECTIONS FOR SLM-SERIES DC SERIES LOAD MODULE .................................... 2-4

FIGURE 2-4 SLM-SERIES DC PLUG-IN LOAD AND MULTIPLE OUTPUT POWER SUPPLY CONNECTION .. 2-4

FIGURE 3-1 SLM-SERIES DC PLUG-IN MODULE FRONT PANEL ........................................................................... 3-1

FIGURE 3-2 ORGANIZATION OF FRONT PANEL CONTROLS OF SLM-SERIES DC PLUG-IN MODULE........ 3-6

FIGURE 3-3 FLOWCHART FOR LOAD MODULE GENERAL SETUP PARAMETERS AND OCP AND OPP

TESTS ...........................................................................................................................................................3-10

FIGURE 3-4 DYNAMIC MODE WAVEFORM AND DEFINITION PARAMETERS....................................................3-13

FIGURE 3-5 NORMAL OPERATING MODE FLOWCHART.........................................................................................3-15

FIGURE 3-6 ANALOG PROGRAMMING LOAD CURRENT IN CC MODE OPERATION.......................................3-17

FIGURE 4-1 LOCAL VOLTAGE SENSE CONNECTIONS ............................................................................................ 4-1

FIGURE 4-2 REMOTE VOLTAGE SENSE CONNECTIONS......................................................................................... 4-2

FIGURE 4-3 CONSTANT CURRENT MODE APPLICATION........................................................................................ 4-3

FIGURE 4-4 DYNAMIC LOAD CURRENT WITH INDEPENDENT PROGRAMMED RISE/FALL SLEW RATE ... 4-4

FIGURE 4-5 CONSTANT VOLTAGE MODE APPLICATION ........................................................................................ 4-5

FIGURE 4-6 CONSTANT RESISTANCE ODE APPLICATION ..................................................................................... 4-6

FIGURE 4-7 CONSTANT POWER MODE APPLICATION............................................................................................ 4-7

FIGURE 4-8 SLM-SERIES DC PLUG-IN LOAD MODULE PARALLEL OPERATION (TOP) SERIES

CONNECTION NOT ALLOWED (BOTTOM)............................................................................................ 4-8

FIGURE 5-1 RS-232 INTERFACE DIAGRAM.................................................................................................................. 5-2

FIGURE 5-2 PROTECTION STATUS REGISTER .........................................................................................................5-23

FIGURE 5-3 ERROR STATUS BYTE REGISTER .........................................................................................................5-23

viii

SECTION 1

INTRODUCTION, FEATURES

AND SPECIFICATIONS

1.1 General Description

The SLM-series DC electronic load module is designed for test, evaluation and burn-in of DC power supplies and batteries. This module must be operated in the SLM Electronic Load chassis, the mainframe whose front panel allows operation of its 150 store/recall setups and which has a remote control feature. All load modules in the mainframe simultaneously return to the previously stored memory when a recall operation is performed on the mainframe.

1.1.1 Power Contours

The power contours of SLM-series DC electronic loads are shown in Figure 1-1 through Figure 1-5.

Voltage (V)

0.5

01530

2.5 5

Figure 1-1 SLM-60-30-150 Power Contour

150W CONTOU

Current (A)

M540071-01 Rev C 1-1

Introduction, Features, Specifications Sorensen SLM-Series DC Load

300W CONTOU

Voltage (V)

5 1

03060

510

Current (A)

Figure 1-2 SLM-60-60-300 Power Contour

250

300W CONTOU

125

Voltage (V)

3 0

1.2

Current (A)

0510

Figure 1-3 SLM-250-10-300 Power Contour

1-2 M540071-01 Rev C

Sorensen SLM-Series DC Load Introduction, Features, Specifications

500

250

Voltage (V)

60 30

3 0

0510

0.6 1.2

300W CONTOU

Current (A)

Figure 1-4 SLM-500-10-300 Power Contour

75W CONTOU

Voltage (V)

0.5 0

03060

510

Current (A)

Figure 1-5 SLM-60-15-75 Power Contour

M540071-01 Rev C 1-3

Introduction, Features, Specifications Sorensen SLM-Series DC Load

1.1.2 Operating Modes

The four operating modes of SLM-series DC electronic load include: Constant Current (CC) mode, Constant Resistance (CR) mode, Constant Voltage (CV) mode, and Constant Power (CP) mode. The wide-range dynamic load with independent rise/fall current slew rate and analog programming input with arbitrary waveform input, is available in Constant Current and Constant Power modes. This dynamic feature enables SLM-series DC electronic loads to simulate real world loads.

CC Mode:

In Constant Current mode, the load will sink a current in accordance with the programmed current setting regardless of the input voltage (see Figure 1-6).

CURRENT SETTING LOAD CURRENT

CR Mode:

In Constant Resistance mode, the load will sink a current linearly proportional to the load input voltage in accordance with the programmed resistance setting (see Figure 1-7).

INPUT VOLTAGE

Figure 1-6 Constant Current (CC) Mode

LOAD CURRENT

RESISTANCE SETTING

INPUT VOLTAGE

Figure 1-7 Constant Resistance (CR) Mode

1-4 M540071-01 Rev C

Sorensen SLM-Series DC Load Introduction, Features, Specifications

CV Mode:

In Constant Voltage mode, the load will attempt to sink enough current to maintain the programmed voltage setting (see Figure 1-8).

VOLTAGE

LOAD CURRENT

SETTING

INPUT VOLTAGE

Figure 1-8 Constant Voltage (CV) Mode

CP Mode:

In Constant Power mode, the load will attempt to sink load power (load voltage x load current) in accordance with the programmed power setting. (see Figure 1-9).

Figure 1-9 Constant Power (CP) Mode

Wide-Range Dynamic Load

POWER SETTING

The Dynamic load can simulate real-world load conditions, thereby providing relevant testing and evaluation for the power source products. Dynamic loading is available for CC (Constant Current) and CP (Constant Power) modes.

M540071-01 Rev C 1-5

Introduction, Features, Specifications Sorensen SLM-Series DC Load

Dynamic Waveform Definition:

There are six parameters to generate a dynamic waveform or pulse waveform: High/Low load levels, Rise/Fall slew rates, and T

HIGH/TLOW durations. The SLM-series DC electronic load will

sink current from the power source, proportional to the dynamic waveform. The dynamic waveform definition is shown in Figure 1-10.

The formula to define the period of dynamic waveform is:

Dynamic frequency = 1 /(T

Duty cycle = T

HIGH / (THIGH + TLOW)

HIGH + TLOW)

Figure 1-10 Dynamic Waveform

The load current level and load status can be set by any of three ways:

• on the front panel of each load module,

• through the mainframe store/recall memory, or

• with GPIB/RS-232 commands

The load input voltage and load current can be read back to the computer through GPIB or RS-232 bus. (See the SLM Mainframe Operation Manual for a description of the mainframe store/recall and GPIB/RS-232 remote operation).

1-6 M540071-01 Rev C

Sorensen SLM-Series DC Load Introduction, Features, Specifications

1.2 Features

• Flexible configuration of plug-in electronic load module and mainframe

• CC, CR, CV, CP, Dynamic, and Short Operating Mode

• Remote control of load condition setting and meter read back

• Dual high accuracy & resolution 16-bit voltage and current meter

• Built-in pulse generator includes wide T

current slew rate control, and High/Low Load level

• Controllable load current slew rate of load level change, load ON/OFF switch change, and power

supply turn-on

• Short circuit test and current measure capability

• Programmable voltage sense capability

• Full protection from over power, over temperature, over voltage, and reverse polarity

• Analog programming input capability at each load module

• Isolated I-monitor BNC output, 10V full scale (except models with maximum voltage >100V)

• Digital calibration

• Variable fan speed control

HIGH/TLOW dynamic load range, independent Rise/Fall load

• Up to 150 Sets Store/Recall EEPROM memory

1.2.1 Accessories

• V-sense cable: BNC-CLIP (1M) 1 ea.

• Binding Post Plug (Black) 1 ea.

• Binding Post Plug (Red) 1 ea.

• Hook terminal 2 ea.

• SLM-series operation manual 1 ea.

• High Voltage V-sense Cable: BNC-CLIP 1M (250 and 500V models) 1 ea.

M540071-01 Rev C 1-7

Introduction, Features, Specifications Sorensen SLM-Series DC Load

1.3 Module Specifications

NOTE: The following specifications apply 25°±5°

MODEL SLM-60-15-75 SLM-60-30-150 SLM-60-60-300 SLM-250-10-300 SLM-500-10-300

INPUT RATING

VOLTAGE

Current

POWER

MIN. VOLTAGE

CC MODE

Range 1 | Range 2 0-1.5A 0-15A 0 - 3A 0 - 30A 0 - 6A 0 - 60A 0 - 1A 0 - 10A 0-1A 0-10A

Resolution 0.4mA 4.0mA 0.8mA 8.0mA 1.6mA 16mA 0.268mA 2.68mA 0.134mA 1.34mA

Accuracy

CR MODE

Range 1 | Range 2 4-15KΩ 0.213-4Ω 2-7.5KΩ 0.1067-2Ω 1-3.75KΩ 0.0533-1Ω 25-18.75KΩ 1.333-25Ω 0.1-18.75KΩ 5.33-100Ω

Resolution 66.66uS 1.066mΩ 0.133mS 0.533mΩ 0.266mS 0.266mΩ 0.053mS 6.666mΩ 13.333uS 26.66mΩ

Accuracy

CV MODE

Range

Resolution

Accuracy

CP MODE

Range

Resolution

Accuracy

SHORT MODE

Resistance

Current

DYNAMIC

THIGH ＆ TLOW

Rise/Fall (Range

Accuracy

4 1/2 DVM

Range 15.0V 60.0V 15.0V 60.0V 15.0V 60.0V 30.0V 250.0V 60.0V 500.0V

Resolution 0.001V 0.002V 0.001V 0.002V 0.001V 0.002V 0.001V 0.01V 0.002V 0.02V

Accuracy

4 1/2 DAM

Range 1.5A 15.0A 3.0A 30.0A 6.0A 60.0A 1.2A 12.0A 1A 10.0A

Resolution 0.0001A 0.001A 0.001A 0.01A 0.001A 0.01A 0.0001A 0.001A 0.0001A 0.001A

Accuracy

Imonitor Load ON Volt.

Range

Resolution

Accuracy

Load OFF Volt.

Range

Resolution

Accuracy

0.05% of Setting + 0.0125

60V 60V 60V 250V 500V 15A 30A 60A 10A 10A

75W 150W 300W 300W 200W

1V @ 15A 1V @30A 1V @ 60A 3V @ 10A 5V @ 10A

± 0.2﹪，OF(SETTING ＋RANGE)

± 0.2﹪OF (SETTING ＋RANGE)

0 - 60V 0 - 60V 0 - 60V 0 - 250V N/A

0.015V 0.016V 0.016V 0.0667V N/A

0 - 75W 0 - 150W 0 – 300W 0 – 300 W 0 - 300W

0.02W 0.04W 0.08W 0.08W 0.08W

0.017Ω 0.034Ω 0.0167Ω 0.08Ω 0.43Ω 15A 30A 60A 10A 10A

1.0-62.5 mA/μs 10-625 mA/μs

1.5 A/V 3.0 A/V 6.0 A/V N/A N/A

0.1 - 25V 0.1 - 25V 0.2 - 50V 0.4 - 100V

0.1V 0.1V 0.2V 0.4V

1% of Setting + 0.25V 1% of Setting + 0.25V 1% + 0.5V 1% of Setting + 1V

0 - 25V 0 - 25V 0 - 50V 0 - 100V

0.002V 0.002V 0.01V 0.02V

2.0-125 mA/

0.2-1.2 A/μs

0.05% of Setting + 0.0125V 0.05% of Setting + 0.025V 0.05% of Setting + 0.05V

± 0.1﹪OF (SETTING ＋RANGE)

± 0.5﹪OF (SETTING ＋RANGE)

4-250 mA/μs

0.04-2.5 A/μs

± 0.05﹪OF (READING ＋RANGE)

± 0.2﹪OF (READING ＋RANGE)

sec to 9.999 sec

± (5﹪+10

0.8-50 mA/μs

8.0-500 mA/μs s)

0.8-50 mA/μs

8.0-500 mA/μs

Table 1-1 SLM-series DC Load Module Specification

1-8 M540071-01 Rev C

Sorensen SLM-Series DC Load Introduction, Features, Specifications

1.4 Regulatory Compliance

• Certified to UL 61010-1, CSA C22.2 No. 61010.1 and IEC/EN 61010-1

• CE Compliant:

o Low Voltage Directive (73/23/EEC) using EN 61010-1, and o EMC Directive (89/336/EEC) using EN 61326

• FCC Compliant to 21 CFR, Subpart J.

1.5 Block Diagram

A functional block diagram of the SLM-series DC electronic load module is illustrated in Figure 1-11. (Please refer to the SLM Mainframe Operation Manual for the functional block diagram of the mainframe).

Memory

Front Panel

Display and

Keyboard

OTP Protection

Circuitry

Serial Port

Osciallator Circuit

12-bit

CPU

Programmable Pulse

16-bit A/D

D/A

8-bit D/A

Generator

Control Circuit

LOW

LEVEL

HIGH

LEVEL

RISE

FALL

Dynamic Funct ion

Load ON

Control

DVM/DAM

Select

Control

MODE Select

LEVEL

Digital Voltmeter

Power MOSFET

Stage

Current

Sense

Digital Ammeter

Buffer

Figure 1-11 Block Diagram of SLM-Series DC Electronic Load

Voltage Amp

Voltage

Vsense Control

Circuit

Amp

LOAD

INPUT

Imonitor

Output

Vsense

Input

The isolated serial port of the SLM mainframe receives the remote programming load level status.

Six parameters (Hi/Low levels, Rise/Fall slew rates, T

HIGH/TLOW durations) constitute the wide range

pulse generator, and can be used to test the power supply - Device Under Test (DUT).

The two 12-bit Digital/Analog (D/A) converters convert the programmed High/Low load level data to an analog signal, and then feed the signal to the input of static/dynamic function control circuit.

The two 8-bit D/A converters control the load current slew rate for Rise and for Fall slew rates.

The two 16-bit timers set T

HIGH and TLOW durations.

M540071-01 Rev C 1-9

Introduction, Features, Specifications Sorensen SLM-Series DC Load

The Constant Current (CC), Constant Resistance (CR), Constant Voltage (CV) and Constant Power (CP) control and the Range circuitry are selected depending upon which operating mode and range are programmed. The drive circuit controls the load current flow through power MOSFET, which is proportional to the analog control signal. The load power energy is converted to heat and is dissipated on the heat sink.

The voltage sensing circuit selects the load input terminal or V-sense BNC input, depending on the V-sense setting.

The current sense amplifier feeds the load current signal to16-bit DAM, which feeds the 5-digit LED display and isolated amplifier (I-Monitor BNC output).

The Auto-ranged 16-bit high accuracy digit voltage meter feeds the input voltage to the 5-digit LED display. The 16-bit voltage and current meter digital bus is connected to CPU circuitry. Each load module can transfer the meter readings to SLM mainframe through isolated serial circuitry.

1-10 M540071-01 Rev C

SECTION 2

INSTALLATION AND MAINTENANCE

This section discusses the installation and removal procedures for the SLM-series DC load module and the SLM quad module mainframe. The SLM-series DC load module does not need any adjustment after plugging into the SLM mainframe.

Figure 2-1 Binding Post and Screw on SLM-Series DC Plug-in Load Module

M540071-01 Rev C 2-1

Installation Sorensen SLM-Series DC Load

2.1 Installation and Removal of SLM-Series DC Plug in

Module

CAUTION: Only qualified personnel should do installation and removal.

Unless the SLM mainframe and the SLM-series DC electronic load module were purchased separately, the load module should be installed in the mainframe before shipment from Xantrex.

Installation and removal procedures for the SLM-series load module are listed below.

2.1.1 Installation

1 Turn the SLM mainframe power OFF before inserting any load module, or damage may

occur to the plug-in module circuitry.

2. Align the upper and lower grooves of the mainframe with the upper and lower guides of the selected compartment.

3. Push the module in and press firmly on the binding posts (labeled, “DC Input” in Figure 2-1) of the front panel to seat the circuit board into the interconnecting jack.

4. Using a screwdriver, tighten the screw on the lower right corner of the SLM-series load module front panel. The screw location is shown in Figure 2-1.

5. DO NOT turn the mainframe power ON until after all of the electronic modules are completely installed.

Figure 2-2 Plug-in Installation and Removal

2-2 M540071-01 Rev C

Sorensen SLM-Series DC Load Installation

2.1.2 Removal

CAUTION: PREVENT DAMAGE TO THE MODULE CIRCUITRY. Do NOT remove the

plug-in module while the mainframe is under power.

1. Turn the SLM mainframe power OFF.

2. Using a screwdriver, loosen the screw on the lower right corner of the front panel.

3. Turn the adjustment knob of the black binding post counter-clockwise until it is fully loosened.

4. Pull on the black adjustment knob of binding post until the interconnecting jack at the rear of the load module disengages.

5. Finish pulling the SLM-series DC load module out from the mainframe.

2.2 Connections

2.2.1 Input Binding Post and Wire Considerations

The output of the device under test (DUT) can be connected to the load by one of five methods, each described in the following subsections. The positive (+) and negative (-) binding posts should be connected to the wires/cables according to the following guidelines. A major consideration in making input connection is the wire size. The minimum wire size is required to prevent overheating and to maintain good regulation. It is recommended that the wires be large enough to limit the voltage drop to less than 0.5V per lead.

Note: When using Constant Resistance mode, Vsense inputs should be used to keep cable

resistance from affecting measurements and regulation.

CAUTION: PREVENT DAMAGE TO THE LOAD. Do NOT apply voltage or current with

power switched OFF. Turn ON the power switch to the load PRIOR to applying voltage or current to the input terminals (i.e., before turning on the power supply under test).

Plug Connectors

This is the most popular way to connect the input of electronic load to the device under test. It is recommended the load current be less than 20A the plug is rated to 20A. The maximum wire gauge should be limited to AWG14.

in this connection since the current rating of

Hook Terminals

The hook terminal provides a good contact to the binding post and can be used anytime. The maximum wire gauge should be limited to AWG10.

Direct Insertion into Binding Posts

This is the most convenient way to connect the load input to the DUT. The maximum wire gauge AWG14 can be used in this application.

M540071-01 Rev C 2-3

Installation Sorensen SLM-Series DC Load

Plug Connectors and Hook Terminals

This method is recommended when input current is greater than 20A.

Plug Connectors and Direct Insertion

This method is also recommended when input current is greater than 20A.

2.2.2 Typical Connections

SLM DC

Electronic Load

Power Source

A. Local Sense Connection B. Remote Sense Connection

Figure 2-3 Typical Connections for SLM-Series DC Series Load Module

2.2.3 The Connection for a Multiple Output Power Supply

Rule for a multiple output power supply connection to the SLM-series DC electronic loads:

The potential of positive input (Red binding post) must be higher than the potential of negative input (Black binding post) of SLM-series DC electronic load.

Figure 2-4 is an example of +5V, -5V, +12V, -12V and +24V six outputs power supply connected to a SLM-series DC electronic load.

+ -

SLM DC

Electronic Load

Power Source

+ -

Figure 2-4 SLM-Series DC Plug-in Load and Multiple Output Power Supply Connection

2-4 M540071-01 Rev C

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