AMETEK SLD Series User Manual

SLD Series Dual Input

DC Electronic Load

Module

Operation and Programming Manual

M540075-01 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

SLD Series Dual Input DC Electronic Load Module Operation and Programming 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 TH E 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

<month spelled out> yyyy Revision C

Part Number

M540075-01

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: SLD Series Dual Input 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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ABOUT THIS MANUAL

This manual has been written expressly for the Sorensen 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 i).

Error! No property name supplied. vii

CONTENTS

SECTION 1 Introduction...............................................................1-1

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

1.1.1

Operating Modes ........................................................................................................1-3

1.2 FEATURES OF THE SLD-SERIES DUAL DC ELECTRONIC LOAD....................................................1-5

1.2.1

Accessories for Each Module .....................................................................................1-5

1.2.2 Specifications..............................................................................................................1-6

1.2.3 Environmental Requirements .....................................................................................1-7

1.2.4 System Equivalent Circuit and Block Diagram ...........................................................1-7

SECTION 2 Installation ................................................................2-1

2.1 INSTALLATION AND REMOVAL OF SLD-SERIES MODULE .............................................................2-3

2.1.1

Installation...................................................................................................................2-3

2.1.2 Removal......................................................................................................................2-3

2.2 INPUT BINDING POST AND WIRE CONSIDERATIONS.....................................................................2-4

2.2.1

Plug Connectors .........................................................................................................2-4

2.2.2 Hook Terminals...........................................................................................................2-5

2.2.3 Direct Insertion into Binding Posts..............................................................................2-5

2.2.4 Plug Connectors and Hook Terminals........................................................................2-5

2.2.5 Plug Connectors and Direct Insertion.........................................................................2-5

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

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

3.1.1

Descriptions................................................................................................................3-2

3.1.2 Summary Chart...........................................................................................................3-8

3.2 OPERATION – SETUP AND OCP TEST ........................................................................................3-8

3.2.1 Overview of Front Panel Operation ............................................................................3-8

3.2.2 Limits –Pass/Fail, Go/No Go ......................................................................................3-9

3.2.3 Configuration ..............................................................................................................3-9

3.2.4 Test Mode.................................................................................................................3-10

3.2.5 Parallel (SLD-60-xxx-xxx and SLD-62-xxx-xxx models only.)...................................3-10

viii

3.3 NORMAL OPERATING MODES.................................................................................................. 3-12

3.3.1 CC Mode.................................................................................................................. 3-12

3.3.2 CR Mode.................................................................................................................. 3-12

3.3.3 CV Mode.................................................................................................................. 3-13

3.3.4 Dynamic Mode......................................................................................................... 3-13

3.3.5 Shorts Mode............................................................................................................. 3-14

3.4 INITIAL SETTINGS ................................................................................................................... 3-16

3.5 PROTECTION FEATURES ......................................................................................................... 3-17

3.5.1 Over Voltage Protection (OVP)................................................................................ 3-17

3.5.2 Over Current Protection (OCP)................................................................................ 3-17

3.5.3 Over Power Protection (OPP).................................................................................. 3-17

3.5.4 Over Temperature Protection (OTP)........................................................................ 3-17

3.5.5 Reverse Polarity....................................................................................................... 3-18

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

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

4.2 R

4.3 C

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

4.5 C

4.6 C

4.7 P

EMOTE SENSE CONNECTIONS ................................................................................................ 4-2

ONSTANT CURRENT (CC) MODE APPLICATION ........................................................................ 4-3

4.3.1 Static Mode:............................................................................................................... 4-3

4.3.2 Dynamic Mode:.......................................................................................................... 4-4

ONSTANT RESISTANCE (CR) MODE APPLICATION ................................................................... 4-6

ONNECTION FOR A MULTIPLE OUTPUT POWER SUPPLY ........................................................... 4-7

ARALLEL OPERATION.............................................................................................................. 4-8

SECTION 5 REMOTE PROGRAMMING ..........................................5-1

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

5.2 GPIB/RS-232C C

5.2.1 Command Syntax Abbreviations................................................................................ 5-2

5.3 GPIB/RS-232 COMMAND DESCRIPTION ................................................................................... 5-6

5.3.1 Setting Commands .................................................................................................... 5-6

Query Commands.................................................................................................... 5-13

5.3.2

OMMAND LIST............................................................................................... 5-2

Appendix A GPIB Programming Example.................................... A-1

Appendix B RS-232 Programming Example ................................ B-1

Appendix C SLD-Series GPIB/RS-232 Operating Flowchart........ C-1

List of Tables

TABLE 1-1 ACCESSORIES INCLUDED WITH EACH SLD-SERIES MODULE........................................................................1-5

TABLE 1-2 SLD-SERIES SPECIFICATIONS ................................................................................................................... 1-6

TABLE 3-1 200W AND 300W SLD SERIES MODULES FACTORY AND POWER ON SETTINGS .......................................3-16

TABLE 3-2 150W AND 550W SLD SERIES MODULES FACTORY AND POWER ON SETTINGS .......................................3-16

List of Figures

FIGURE 1-1 POWER CONTOUR FOR: A) CHANNEL A OF SLD-60-505-255 AND SLD-61-505-255; B) CHANNEL B OF

SLD-60-505-255; C) CHANNEL B OF SLD-61-505-255 ELECTRONIC LOADS............................................1-1

FIGURE 1-2 POWER CONTOURS FOR SLD-60-20-102 AND SLD 80-20-102 ELECTRONIC LOAD CHANNELS A AND B.... 1-2

FIGURE 1-3 POWER CONTOURS FOR SLD-61-5-752 AND SLD-62-5-752 ELECTRONIC LOAD MODULES ...................... 1-2

FIGURE 1-4 POWER CONTOURS FOR SLD-60-105-550 ELECTRONIC LOAD ................................................................. 1-2

FIGURE 1-5 CONSTANT CURRENT MODE ....................................................................................................................1-3

FIGURE 1-6 CONSTANT RESISTANCE MODE................................................................................................................ 1-3

FIGURE 1-7 CONSTANT VOLTAGE MODE .................................................................................................................... 1-4

FIGURE 1-8 DYNAMIC WAVEFORM.............................................................................................................................. 1-4

FIGURE 1-9 SLD-60-XXX-XXX: DUAL POSITIVE LOAD CHANNEL................................................................................... 1-7

FIGURE 1-10 SLD-61-XXX-XXX: CHANNEL A/B IS POSITIVE/NEGATIVE LOAD CHANNEL, RESPECTIVELY .......................1-7

FIGURE 1-11 SLD-62-XXX-XXX: DUAL NEGATIVE LOAD CHANNEL ...............................................................................1-8

FIGURE 1-12 SLD-SERIES BLOCK DIAGRAM ...............................................................................................................1-8

FIGURE 2-1 LOAD INPUT CONNECTOR AND SCREW FOR SINGLE-BAY UNIT...................................................................2-1

FIGURE 2-2 550W LOAD INPUT CONNECTOR AND SCREW FOR DOUBLE-BAY UNIT ....................................................... 2-2

FIGURE 2-3 SINGLE BAY, DUAL INPUT ELECTRONIC LOAD MODULE PLUG-IN AND REMOVAL .........................................2-4

FIGURE 2-4 DUAL BAY ELECTRONIC LOAD PLUG-IN AND REMOVAL .............................................................................. 2-4

FIGURE 3-1 SLD-SERIES DUAL DC ELECTRONIC LOAD FRONT PANEL, SINGLE BAY..................................................... 3-1

FIGURE 3-2 SLD-SERIES DUAL DC ELECTRONIC 550W LOAD FRONT PANEL, DOUBLE BAY ......................................... 3-2

FIGURE 3-3 ORGANIZATION OF FRONT PANEL CONTROLS OF SLD ELECTRONIC LOAD .................................................3-8

FIGURE 3-4 SETUP OF SLD SERIES ELECTRONIC LOAD ............................................................................................3-11

FIGURE 3-5 SLD-SERIES OPERATION FLOW CHART .................................................................................................. 3-15

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 MODE APPLICATION ...........................................................................................4-6

FIGURE 4-7 EXAMPLE CONNECTION, SIX-OUTPUT POWER SUPPLY TO FOUR SLD-SERIES MODULES IN AN SLM-4

HASSIS ................................................................................................................................................4-7

FIGURE 4-8 SLD-SERIES DC PLUG-IN LOAD MODULE PARALLEL OPERATION .............................................................. 4-8

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

FIGURE 5-2 PROTECTION STATUS REGISTER............................................................................................................ 5-16

FIGURE 5-3 ERROR STATUS BYTE REGISTER ........................................................................................................... 5-17

1.1 General Description

The SLD-series Electronic Load modules are designed to test, evaluate and burn-in multioutput DC power supplies and batteries. Each SLD-series Electronic load module is a twochannel programmable DC Electronic load. Each module has its own control and display with CC, CR. CV, Dynamic, and Short operation modes, 150 sets Store/Recall memory, and GO/NG check sorting. The modules operate in the SLM Mainframe by manual control or by programmable GPIB and RS-232 remote control.

SECTION 1

INTRODUCTION

The SLM Mainframe accommodates up to four SLD-series modules, except for the 550W module, for combination testing requirements. The size of the 550W module, a dual load, requires two mainframe bays in the mainframe, and can be installed in channels 1 & 2, 2 & 3 or 3 & 4 of the SLM-4 mainframe. The channel identification will be the rightmost bay. Figure 1-1 through Figure 1-4 show the power contours for each model of the SLD-series Electronic Load:

Voltage (V)

8.34.2

02550

Curr e n t (A mps)

a) b) c)

Figure 1-1 Power contour for: a) Channel A of SLD-60-505-255 and SLD-61-505-255;

b) Channel B of SLD-60-505-255; c) Channel B of SLD-61-505-255 electronic loads

Voltage (V)

0.5 0

02.5 5

1.7

0.83

Current (Amps)

- Volt a ge (-V)

02.55

1.70.83

Current (Amps)

M540075-01 Rev C 1-1

Introduction Sorensen SLD-Series DC Load

Volta ge (V)

01020

8.34.2

Current (Amps)

Voltage

0.4

0 10

2.51.25

Current (Amps)

Figure 1-2 Power Contours for SLD-60-20-102 and SLD 80-20-102 Electronic Load Channels A and B

Voltage (V)

0.5 0

1.25

02.55

SLD-61-5-752 Channel A SLD-61-5-752 Channel B, SLD-62-5-752 Channel A and B

Cu rrent (Amps)

- Voltage (-V)

1.25

02.55

Current (Amps)

Figure 1-3 Power Contours for SLD-61-5-752 and SLD-62-5-752 Electronic Load Modules

Voltage (V)

5 1

4.2

8.3

050100

Current (Amps)

Channel A Channel B

Voltage (V)

0.5 0

02.55

1.70.83

Current (Amp s)

Figure 1-4 Power Contours for SLD-60-105-550 Electronic Load

1-2 M540075-01 Rev C

Sorensen SLD-Series DC Load Introduction

1.1.1 Operating Modes

The operating modes of the SLD-series Electronic Load include Constant Current (CC) mode, Constant Resistance (CR) mode, and Constant Voltage (CV) mode. The wide range dynamic load with rise/fall current slew rate is available in CC mode only.

CC Mode: (Constant Current mode)

With the operating mode of constant current, the SLD-series Electronic load will sink a current in accordance with the programmed value regardless of the input voltage (see Figure 1-5).

LOAD CURRENT

CURRENT SETTING

INPUT VOLTAGE

Figure 1-5 Constant Current Mode

CR Mode: (Constant Resistance Mode)

At constant resistance mode; the SLD-series Electronic Load will sink a current linearly proportional to the load input voltage in accordance with the programmed resistance setting (see Figure 1-6).

LOAD CURRENT

RESISTANCE SETTING

INPUT VOLTAGE

Figure 1-6 Constant Resistance Mode

M540075-01 Rev C 1-3

Introduction Sorensen SLD-Series DC Load

CV Mode: (Constant Voltage Mode)

At constant voltage mode; the SLD-series Electronic Load will attempt to sink enough current until the load input voltage is equaled to the programmed value (see Figure 1-7).

VOLTAGE

LOAD CURRENT

SETTING

INPUT VOLTAGE

Figure 1-7 Constant Voltage Mode

Dynamic Waveform Definition:

There are six parameters to generate dynamic waveform or pulse waveform: High Load Level, Low Load Level, T

HIGH, TLOW, and Rise and Fall Slew Rates. The SLD-series

Electronic Load will sink current from the power source proportional to the dynamic waveform, the definition for which is shown in Figure 1-8. The period of dynamic waveform is T-high + T-low.

Dynamic frequency = 1 /( T-high + T-low ) Duty cycle = T-high / ( T-high + T-low )

Figure 1-8 Dynamic Waveform

1-4 M540075-01 Rev C

Sorensen SLD-Series DC Load Introduction

1.2 Features of the SLD-Series Dual DC Electronic Load

The SLD-series dual DC Electronic load includes six models, where 200-300W models are suitable for PS/2,ATX personal computer power supply testing, 150W models are for low power output power supply (ex. DC/DC converter) testing applications, the 550W module is designed for higher power computer server power supply applications.

• Very flexible Dual Load configuration to SLM mainframe with maximum power up to

300W (250W+50W) for single-bay module or up to 550W for the dual bay module; it meets multiple output power supply test requirements.

• Both Front panel and Remote control are available; the remote interface can be built-in

RS-232 or GPIB with setting and read-back capability. (GPIB is optional in the SLM-1 chassis).

• Dual Voltage and current meter display with 16-bit high accuracy/resolution A/D

converter.

• Built-in Dynamic pulse generator for dynamic loading control.

• Meter reading GO/NG check capability.

• Short circuit load testing capability with short circuit current measurement.

• Built-in 150 sets Store/Recall EEPROM memory.

• Protection against Over Voltage, Over current, Over power, Over temperature, and

reverse polarity.

• Built-in power supply OCP and OVP testing function.

• Power supply output automatic testing by the auto-sequence function of mainframe.

• Programmable Load ON and Load OFF voltage control.

• Advance Cooling Fan control, the fan speed is proportional to the load power, the fan

noise can be reduced in low power applications.

1.2.1 Accessories for Each Module

Accessories SLD-60-505-255 SLD-61-505-255

Miniature banana plug (Red) 2 1 2 1 0 2

Miniature banana plug (Black) 2 2 2 2 2 2

Miniature banana plug (White) 0 1 0 1 2 0

Banana plug (Red) 2 1 2 1 0 4

Banana plug (Black) 2 2 2 2 2 4

Banana plug (White) 0 1 0 1 2 0

Heavy spread lug terminal 2 2 0 0 0 4

Spread lug terminal 2 2 4 4 4 2

Operation manual 1 1 1 1 1 1

SLD-60-20-102/

SLD-80-20-102

SLD-61-5-752 SLD-62-5-752 SLD-60-105-550

Table 1-1 Accessories Included with Each SLD-series Module

M540075-01 Rev C 1-5

Introduction Sorensen SLD-Series DC Load

1.2.2 Specifications

The following specifications apply 25°C ± 5°C

MODEL SLD-60-505-255 SLD-61-505-255 SLD-60-20-102 SLD-80-20-102 SLD-61-5-752 SLD-62-5-752 SLD-60-105-550 INPUT RATING

Voltage CH. A: +60V CH. B: +60V CH. A: +60V CH. B: -60V +60V x 2 +80V x 2

Current 50A 5A 50A 5A 20A x 2 20A x 2 5A X 2 5A X 2 100A 5A

Min. Voltage (Full Current): 0.4V 0.4V 0.4V 0.9V 0.4V 0.4V 0.4V 0.3V 0.4V 0.4V

CC MODE

CR MODE

Range 1 (I>0.02% of rating) 1.2-4500Ω 12 - 45000Ω 1.2-4500Ω 12 - 45000Ω 3 - 11250Ω 4 - 15000Ω

Range 2 (I>0.2% of rating) 0.04-1.2Ω 0.4 - 12Ω 0.04-1.2Ω 0.4 - 12Ω 0.1 - 3Ω 0.134 - 4Ω 0.4 - 12Ω 0 .02 - 0.6Ω 0.4 - 12Ω

CV MODE

SHORT MODE

DYNAMIC MODE

4 1/2 DVM

4 1/2 DAM

Load ON Volt.

Load OFF Volt.

Weight

Power 250W 50W 250W 50W 100W x 2 100W x 2 75W x 2 75W x 2 500W 50W

Range 0 - 5A / 50A 0-0.5A / 5A 0 - 5A / 50A 0-0.5A / 5A

Resolution 1.34 / 13.4mA 0.134 / 1.34mA 1.34 / 13.4mA 0.134 / 1.34mA

Accuracy

Range

Resolution

Accuracy

Resistance 8mΩ 0.08Ω 8mΩ 0.18Ω 0.02Ω 0.02Ω 0.2Ω 0.06Ω 4mΩ 0.08Ω

Current 50A 5A 50A 5A 20A 20A 5A 5A 100A 5A

THIGH / TLOW

4 - 200 mA/μs

Slew Rate

40-2000 mA/μs

Resolution

Accuracy

Resolution

Accuracy

Resolution 1mA / 10mA 0.1mA / 1mA 1mA / 10mA 0 .1mA / 1mA

Accuracy

Resolution

Accuracy

Resolution

Accuracy

0.8 mA/μs

8 mA/

Range

Range 15A / 50A 1.5A / 5A 15A / 50A 1.5A / 5A

Range

0.4 - 20 mA/μs 4 - 200 mA/μs

0.08 mA/μs

0.8 mA/μs

0.2% of (Setting + Range) 0.2% of (Setting + Range)

0 – 60V 0 - 60V 0 - 80V 0 – 60V

16mV 16mV 21.3mV 16mV

0.2% of (Setting + Range) 0.2% of (Setting + Range)

50μsec to 9.999 sec 50μsec to 9.999 sec

4 - 200 mA/μs 40-2000 mA/μs

0.8 mA/μs

8 mA/μs

15V / 60.00V 20V / 80V 15V / 60.00V

0.4 - 20 mA/μs 4 - 200 mA/μs

0.08 mA/μs

0.8 mA/μs

±10% OF (Setting + 10

0.2% of (Reading + Range) 0.2% of (Reading + Range)

s) ±10% OF (Setting + 10μs)

3.5 kgs. / 7.7 lbs. 7 kgs. / 15.4 lbs.

0 - 2.0A / 20A

0.534 / 5.34mA

1.6-80 mA/μs

16-800 mA/μs

0.32 mA/

3.2 mA/μs

0.001V / 0.01V

0.05% of (Reading + Range)

2.0A/20A

0.1mA / 1mA

0.1-25V

0.1V

1% of Setting + 0.25V

0-25V

1mV

1% of Setting + 0.25V

CH.A: +60V,

CH. B: -60V

0 - 0.5A / 5A 0 - 0.5A / 5A 0 - 1.0A / 100A 0 - 0.5A / 5A

0.134 / 1.34mA 0.134 / 1.34mA 2.66/26.6mA 0.134 / 1.34mA

1.5A / 5A 10/100A 1.5A / 5A

0.1mA / 1mA 1/10mA 0.1mA / 1mA

CH. A: -60V, CH.

12 - 45000Ω

0.4 - 20 mA/μs 4 - 200 mA/μs

0.08 mA/μs

0.8 mA/μs

B: -60V

CH. A: +60V CH. B: +60V

0.6 - 2250Ω 12 - 45000Ω

8-400 mA/μs

80-4000 mA/μs

1.6 mA/μs

16 mA/

0.4 - 20 mA/μs

4 - 200 mA/μs

0.08 mA/μs

0.8 mA/μs

Table 1-2 SLD-series Specifications

1-6 M540075-01 Rev C

Sorensen SLD-Series DC Load Introduction

1.2.3 Environmental Requirements

• For indoor use only

• Installation Category II (over voltage)

• Pollution Degree 2

• Altitude up to 2000 meters (with power derating)

• Relative Humidity 80% RH Max

• Ambient Operating Temperature 0-40°C, with ideal being 25°C ± 5°C

1.2.4 System Equivalent Circuit and Block Diagram

The equivalent polarity circuit diagrams of SLD-series Dual DC Electronic Load are shown below:

CHAN.A CHAN.B

IA IB

COM COM

Figure 1-9 SLD-60-xxx-xxx: Dual Positive Load Channel

CHAN.A CHAN.B

IA IB

COM COM

Figure 1-10 SLD-61-xxx-xxx: Channel A/B is Positive/Negative Load Channel, Respectively

M540075-01 Rev C 1-7

Introduction Sorensen SLD-Series DC Load

CHAN.A CHAN.B

IA IB

COM COM

Figure 1-11 SLD-62-xxx-xxx: Dual Negative Load Channel

The system functional block diagram of SLD-series Electronic Load module is illustrated in Figure 1-12. The functional block diagram of the mainframe is described in the SLM mainframe operation manuals.

CHANNEL A

Memory

Front Panel Display and

Keyboard

OTP Protection

Circuitry

Serial Port

Osciallator Circuit

CPU

12-bit

16-bit

Timer

16-bit

Timer

12-bit

16-bit

Timer

16-bit

Timer

Load ON

Control

16-bit A/D

DVM/DAM

D/A

8-bit

D/A

8-bit

D/A

LOW

LEVEL

HIGH

LEVEL

SLEW RATE

HIGH

LOW

LEVEL

HIGH

LEVEL

SLEW

RATE

HIGH

LOW

Dynamic Function

Control

MODE Select

CHANNEL B

MODE Select

DVM/DAM

Select

Range

I/II

Range

I/II

Power MOSFET

Stage

Power MOSFET

Stage

Current

Sense

Current

Sense

Vsense

Control Circuit

Vsense

Control Circuit

LOAD

INPUT

LOAD

INPUT

Vsense

Input

Vsense

Input

Figure 1-12 SLD-series Block Diagram

Each load channel receives the load levels and load status from the chassis via either serial optical isolated bus or keyboard.

• two 12-bit D/A converters receive digital data of the high and low load levels and

transfer them as an analog signal to the Dynamic Function Generator (DFG)

• two 8-bit D/A converters control the load current slew rate and feed into the DFG

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Sorensen SLD-Series DC Load Introduction

• two 16-bit timers set current THIGH and TLOW duration and feed into the DFT

• the DFG sends analog signals to the Load Control Circuit

• one of Constant Current (CC), Constant Resistance (CR), or Constant Voltage (CV)

and one range level is selected, depending on which mode and range are operating

• the drive circuit controls the load current flow through power MOSFET

• the current sense Amplifier, built into the power MOSFET stage, feeds the load

current signal to 16-bit DAM.

• the voltage V-sensing circuit selects the Load input terminal or V-sense BNC input,

depending on the CONFIG key's V-sense ON/OFF setting, and feeds the voltage signals to 16-bit DVM

The 16-bit voltage and current meter digital bus feeds back to the CPU circuitry; each SLDseries load module can transfer to chassis through isolated serial circuitry.

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Introduction Sorensen SLD-Series DC Load

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SECTION 2

INSTALLATION

This Section discusses the installation and removal of SLD-series Electronic load modules from the SLM mainframe. The SLD-series load module plugs into any channel of the SLM mainframe and does not need any adjustment after plug in.

WARNING: Only qualified personnel should do installation and removal.

Figure 2-1 Load Input Connector and Screw for Single-Bay Unit

M540075-01 Rev C 2-1

Installation Sorensen SLD-Series DC Load

Figure 2-2 550W Load Input Connector and Screw for Double-Bay Unit

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Sorensen SLD-Series DC Load Installation

2.1 Installation and Removal of SLD-Series Module

Unless the SLM mainframe and SLD-series Electronic load module were purchased separately, the SLD-series Electronic load module should be installed in the mainframe before shipment from Sorensen.

The SLD-series Electronic load module operates in SLM mainframe for front panel and remote control feature, but cannot be operated without the mainframe.

When you want to install or remove the SLD-series load module into or from the SLM mainframe for configuration or reconfiguration purposes, please follow the procedures in Section 2.1.1 or 2.1.2.

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

with chassis 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).

2.1.1 Installation

1. Turn the chassis power OFF before inserting the SLD-series 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 SLD-series load module in and press firmly on the binding posts of the front panel to seat the circuit board in the interconnecting jack.

4. Fasten the screw on the lower and right hand side corner of the SLD-series front panel with screwdriver, the screw location is shown on Figure 2-2.

5. Turn the chassis power ON until all of the electronic modules are completely installed.

2.1.2 Removal

1. Turn the chassis power OFF first; otherwise, damage may occur to the plug-in circuitry.

2. Loosen the screw on the front panel of SLD-series with screwdriver.

3. Turn the adjustment knob of the black binding post counter clockwise until the adjustment knob is fully moved out; Then pull on the black adjustment knob of binding post until the interconnecting jack disengages and SLD-series load module will slide out.

M540075-01 Rev C 2-3

Installation Sorensen SLD-Series DC Load

Figure 2-3 Single Bay, Dual Input Electronic Load Module Plug-in and Removal

Figure 2-4 Dual Bay Electronic Load Plug-in and Removal

2.2 Input Binding Post and Wire Considerations

There are five ways that binding posts (+, com and -) can connect the input wires to the Electronic:

2.2.1 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 in this connection since the current rating of the plug is rated to 20A. The maximum wire gauge should be limited to AWG14.

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Sorensen SLD-Series DC Load Installation

2.2.2 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.

2.2.3 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.

2.2.4 Plug Connectors and Hook Terminals

This method is recommended when input current is greater than 20A or long lead wires.

2.2.5 Plug Connectors and Direct Insertion

This method is also recommended when input current is greater than 20A or long lead wires. 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.

Note:

SLD-series dual Electronic Load's Channel A and Channel B Load input connector has common connections, this means the ground common point (Black binding post) for Channel A and B is wired together.

• 2 positive (+) load modules should be used for two positive output power supply test

applications

• one positive (+) one negative (-) load module should be used for one positive (+) one

negative (-) output power supply test application

• 2 negative (-) load modules should be used for two negative output power supply test

applications,

However, each Dual DC Electronic Load module common input is isolated to the other Load module, therefore, please make a polarity combination consideration for power supply and the Dual Load module. See Figure 1-9 to Figure 1-11.

M540075-01 Rev C 2-5

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