APS 3A Series User manual

Operation Manual
3A Series – Rev 1.5 P/N 160922-10
3ASeries
ProgrammableAC&DCload
ADAPTIVE Power Systems
Worldwide Supplier of Power Equipment
TM
Copyright 2014, Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.

3A SERIES OPERATION MANUAL
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Table of Contents
1Contact Information................................................................................................................................ 6
2Front Matter ........................................................................................................................................... 7
2.1 Limited Warranty .................................................................................................................................................... 7
2.2 Service and Spare Parts Limited Warranty ............................................................................................................ 7
2.3 Safety Information .................................................................................................................................................. 7
2.4 Safety Notices.......................................................................................................................................................... 9
3Product Overview ................................................................................................................................. 11
3.1 General Description .............................................................................................................................................. 11
3.2 Operating Modes .................................................................................................................................................. 11
3.2.1 Constant Current Mode ..................................................................................................................................................... 11
3.2.2 Linear Constant Current Mode (LIN) .................................................................................................................................12
3.2.3 Constant Resistance Mode (CR) ........................................................................................................................................12
3.2.4 Current Read-back.............................................................................................................................................................. 13
3.3 External Sync Mode .............................................................................................................................................. 13
3.4 Product Features ................................................................................................................................................... 13
3.5 Accessories Included ............................................................................................................................................. 14
3.6 Interface Options................................................................................................................................................... 14
4Technical Specifications ........................................................................................................................ 15
4.1 Operating Ranges.................................................................................................................................................. 15
4.2 Operating Modes .................................................................................................................................................. 15
4.3 Protection Modes.................................................................................................................................................. 15
4.4 Power Factor Range .............................................................................................................................................. 16
4.5 Metering ................................................................................................................................................................ 16
4.6 Analog I/O.............................................................................................................................................................. 16
4.7 Power & Cooling.................................................................................................................................................... 16
4.8 Dimensions & Weight ........................................................................................................................................... 17
4.9 Environmental ....................................................................................................................................................... 17
4.10 Voltage versus Current Operating Envelope Charts............................................................................................ 18
4.10.1 Model 3A060-20 V-I Curves............................................................................................................................................... 18
4.10.2 Model 3A150-08 V-I Curves............................................................................................................................................... 19
4.10.3 Model 3A300-04 V-I Curves............................................................................................................................................... 20
5Unpacking and Installation.................................................................................................................... 21
5.1 Inspection .............................................................................................................................................................. 21
5.2 Installation and Removal of 3A Series Load Modules ......................................................................................... 21
5.3 Cleaning ................................................................................................................................................................. 22
5.4 Powering Up .......................................................................................................................................................... 22
5.5 In Case of Malfunction .......................................................................................................................................... 22
5.6 Load Connection.................................................................................................................................................... 23
5.7 Interface Options................................................................................................................................................... 23
5.8 External Sync Connector....................................................................................................................................... 23
6Front Panel Operation........................................................................................................................... 24
6.1 Front Panel Layout ................................................................................................................................................ 24
6.2 User Controls, Displays and Connectors .............................................................................................................. 25
6.3 Coarse and fine Adjustment Ranges .................................................................................................................... 30
6.1 AC or DC Load Mode Selection............................................................................................................................. 31
6.1.1 AC Mode Setting.................................................................................................................................................................31
6.1.2 DC Mode Setting.................................................................................................................................................................31
6.2 AC Load Parameter Settings ................................................................................................................................. 32

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6.2.1 Frequency Setting............................................................................................................................................................... 32
6.2.2 Waveform and Crest Factor Bank Selection ..................................................................................................................... 33
6.2.3 Synchronization Source Setting .........................................................................................................................................38
6.3 Initial Power-on Settings....................................................................................................................................... 39
6.3.1 Model 3A060-20 Power-on Settings .................................................................................................................................39
6.3.2 Model 3A150-08 Initial Settings ........................................................................................................................................ 39
6.3.3 Model 3A300-04 Initial Settings ........................................................................................................................................ 39
6.3.4 Last Setting Recall ............................................................................................................................................................... 40
6.3.5 Setup Memory Reset .........................................................................................................................................................40
6.4 Protection Features............................................................................................................................................... 41
6.4.1 Over Voltage Protection..................................................................................................................................................... 41
6.4.2 Over Current Protection.....................................................................................................................................................41
6.4.3 Over Power Protection.......................................................................................................................................................41
6.4.4 Over Temperature Protection ........................................................................................................................................... 41
6.5 Load ON Voltage Adjustment............................................................................................................................... 42
7Connectors ............................................................................................................................................ 43
7.1 INPUT Terminals.................................................................................................................................................... 43
7.1.1 Banana Jack Connectors .................................................................................................................................................... 43
7.1.2 Y-hook / Spade Lug Terminals ........................................................................................................................................... 43
7.1.3 Lead Wire Insertion ............................................................................................................................................................ 43
7.1.4 Banana Jack Connector and Spade Lug Terminals ........................................................................................................... 43
7.1.5 Plug Connector and Lead Wire Insertion .......................................................................................................................... 43
7.2 Wire Size ................................................................................................................................................................ 44
7.3 Connecting a UUT.................................................................................................................................................. 45
7.4 Voltage Sense Input Terminals ............................................................................................................................. 46
7.5 Current Output Monitor (I-Monitor).................................................................................................................... 47
7.5.1 Isolated Output................................................................................................................................................................... 47
8Remote Control Programming .............................................................................................................. 48
8.1 Overview................................................................................................................................................................ 48
9Multiple Load Operation Modes ........................................................................................................... 49
9.1 Overview................................................................................................................................................................ 49
9.1.1 Parallel Mode...................................................................................................................................................................... 49
9.1.2 Multi-Phase Mode.............................................................................................................................................................. 49
10 Calibration............................................................................................................................................. 51
10.1 Overview................................................................................................................................................................ 51
10.2 Calibration Interval................................................................................................................................................ 51
10.3 Calibration Coefficients......................................................................................................................................... 51
10.4 Calibration Procedures.......................................................................................................................................... 51
11 CE MARK Declaration of Conformity ..................................................................................................... 52
12 RoHS & REACH Declarations ................................................................................................................. 53
INDEX ..............................................................................................................................................54

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Table of Tables
Table 3-1: Included Accessories ...................................................................................................................................14
Table 3-2: Available Remote Control Interface Options ..............................................................................................14
Table 6-1: Front Panel Display and Keyboard Functions..............................................................................................29
Table 6-2: Model 3A060-20 Course and Fine Adjustments..........................................................................................30
Table 6-3: Model 3A150-08 Course and Fine Adjustments..........................................................................................30
Table 6-4: Model 3A300-04 Course and Fine Adjustments..........................................................................................30
Table 6-5: Waveform Bank Data Table........................................................................................................................33
Table 6-6: Internal or External Sync Circuits ................................................................................................................38
Table 6-7: Model 3A060-20 Power-on Settings ...........................................................................................................39
Table 6-8: Model 3A150-08 Power-on Settings ...........................................................................................................39
Table 6-9: Model 3A300-04 Power-on Settings ...........................................................................................................39
Table of Figures
Figure 4-1: Module 3A060-20 V-I Curve.......................................................................................................................18
Figure 4-2: Module 3A150-08 V-I Curve.......................................................................................................................19
Figure 4-3: Module 3A300-04 V-I Curve.......................................................................................................................20
Figure 5-1: Installation or removal of a load module ..................................................................................................21
Figure 6-1: 3A Series Load Front Panel ........................................................................................................................24
Figure 6-2: Front Panel User Controls and Indicators ..................................................................................................25
Figure 6-3: Waveforms in Banks 0 through 2 ..............................................................................................................33
Figure 6-4: Waveforms in Banks 3 through 5 ..............................................................................................................34
Figure 6-5: Waveforms in Banks 6 through 8 ..............................................................................................................35
Figure 6-6: Square Waveforms Bank 9 ........................................................................................................................36
Figure 6-7: DC Waveforms Bank 10 .............................................................................................................................37
Figure 7-1: Doubling wire size using spade lugs ..........................................................................................................44
Figure 7-2: Internal and External Voltage Sense Connections .....................................................................................46
Figure 9-1: Parallel Load Connection ...........................................................................................................................49
Figure 9-2: Three Phase Wye Connection ...................................................................................................................50
Figure 9-3: Three Phase Delta Connection...................................................................................................................50

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1Contact Information
AMERICA/CANADA
Adaptive Power Systems, Inc.
Irvine, USA
Phone: [phone]
Fax: [phone]
Email: [e-mail]
EUROPE
Caltest Instruments Ltd.
Guildford, United Kingdom
Phone: [phone]
Fax: [phone]
Email: [e-mail]
CHINA
PPST Shanghai Co. Ltd.
Shanghai, China
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Web: http://www.adaptivepower.com

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2Front Matter
2.1 Limited Warranty
Adaptive Power Systems, Inc. (APS) warrants each unit to be free from defects in material and
workmanship. For the period of one (1) year from the date of shipment to the purchaser, APS
will either repair or replace, at its sole discretion, any unit returned to the APS factory in Irvine,
California or one of its designated service facilities. It does not cover damage arising from
misuse of the unit or attempted field modifications or repairs. This warranty specifically
excludes damage to other equipment connected to this unit.
Upon notice from the purchaser within (30) days of shipment of units found to be defective in
material or workmanship, APS will pay all shipping charges for the repair or replacement. If
notice is received more than thirty (30) days from shipment, all shipping charges shall be paid by
the purchaser. Units returned on debit memos will not be accepted and will be returned
without repair.
This warranty is exclusive of all other warranties, expressed or implied.
2.2 Service and Spare Parts Limited Warranty
APS warrants repair work to be free from defects in material and workmanship for the period of
ninety (90) days from the invoice date. This Service and Spare Parts Limited Warranty applies to
replacement parts or to subassemblies only. All shipping and packaging charges are the sole
responsibility of the buyer. APS will not accept debit memos for returned power sources or for
subassemblies. Debit memos will cause return of power sources or assemblies without repair.
This warranty is exclusive of all other warranties, expressed or implied.
2.3 Safety Information
This chapter contains important information you should read BEFORE attempting to install and
power-up APS Equipment. The information in this chapter is provided for use by experienced
operators. Experienced operators understand the necessity of becoming familiar with, and then
observing, life-critical safety and installation issues. Topics in this chapter include:
•Safety Notices
•Warnings
•Cautions
•Preparation for Installation
•Installation Instructions
Make sure to familiarize yourself with the SAFETY SYMBOLS
shown on the next page. These symbols are used throughout this manual and relate to
important safety information and issues affecting the end user or operator.

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SAFETY SYMBOLS
Direct current (DC)
Alternating current (AC)
Both direct and alternating current
Three-phase alternating current
Off (Supply)
On (Supply)
Protective Earth (ground) terminal
Caution: Refer to this manual before this Product.
Caution, risk of electric shock
Fuse

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2.4 Safety Notices
SAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation,
service, and repair of this instrument. Failure to comply with these precautions or with specific
warnings elsewhere in this manual violates safety standards of design, manufacture, and
intended use of the instrument. Adaptive Power Systems assumes no liability for the customer's
failure to comply with these requirements.
GENERAL
This product is a Safety Class 1 instrument (provided with a protective earth terminal). The
protective features of this product may be impaired if it is used in a manner not specified in the
operation instructions.
ENVIRONMENTAL CONDITIONS
This instrument is intended for indoor use in an installation category I, pollution degree 2
environments. It is designed to operate at a maximum relative humidity of 80% and at altitudes
of up to 2000 meters. Refer to the specifications tables for the ac mains voltage requirements
and ambient operating temperature range.
BEFORE APPLYING POWER
Verify that the product is set to match the available line voltage and the correct fuse is installed.
GROUND THE INSTRUMENT
This product is a Safety Class 1 instrument (provided with a protective earth terminal). To
minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical
ground. The instrument must be connected to the AC power supply mains through a properly
rated three-conductor power cable, with the third wire firmly connected to an electrical ground
(safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or
disconnection of the protective earth terminal will cause a potential shock hazard that could
result in personal injury.
FUSES
Only fuses with the required rated current, voltage, and specified type (normal blow, time delay,
etc.) should be used. Do not use repaired Fuses or short circuit the fuse holder. To do so could
cause a shock or fire hazard.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.
Do not operate the instrument in the presence of flammable gases or fumes.
KEEP AWAY FROM LIVE CIRCUITS.
Operating personnel must not remove instrument covers. Component replacement and internal
adjustments must be made by qualified service personnel. Do not replace components with
power cable connected. Under certain conditions, dangerous voltages may exist even with the
power cable removed. To avoid injuries, always disconnect power, discharge circuits and
remove external voltage sources before touching components.

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DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another person, capable of rendering first
aid and resuscitation, is present.
DO NOT EXCEED INPUT RATINGS.
This instrument may be equipped with a line filter to reduce electromagnetic interference and
must be connected to a properly grounded receptacle to minimize electric shock hazard.
Operation at line voltages or frequencies in excess of those stated on the data plate may cause
leakage currents in excess of 5.0 mA peak.
DO NOT EXCEED LOAD INPUT VOLTAGE RATING.
WARNING
DO NOT EXCEED LOAD INPUT VOLTAGE RATING
This instrument does NOT have a means to disconnect its Load input from a
connected power supply. If the voltage applied to the Load input exceeds its
maximum rating – even if the load is turned completely off – damage to the load
WILL occur. Damage caused by exceeded maximum load input voltage under any
circumstance is NOT covered by the manufacturer’s product warranty. Remove any
load input connections when the load is not in use, even when it is turned off.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or
perform any unauthorized modification to the instrument. Return the instrument to an Adaptive
Power Systems Sales and Service Office for service and repair to ensure that safety features are
maintained.
Instruments that appear damaged or defective should be made inoperative and secured against
unintended operation until they can be repaired by qualified service personnel.

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3Product Overview
This chapter provides an overview of the APS 3A Series programmable AC & DC load modules. It
introduces the reader to general operating characteristics of these loads.
3.1 General Description
The APS 3A Series electronic load is designed to test, evaluation and burn-in of AC or DC power
supplies and batteries. The APS 3A Series electronic load can be operated from the front panel
(manual mode) or using RS232 or GPIB remote control. The 3A Series load modules must be
installed in either a four slot 34M04 or single slot 34M01 mainframe to be functional. The
mainframe provides bias supplies and cooling for the 3A load module(s). Also refer to the 4-slot
34M04 Operation Manual (P/N 160924) or single-slot 34M01 Operation Manual (P/N 160921)
for specific information on using the 3A load modules with these mainframes.
The VI curve constant power contours of the various 3A Series models are shown in the
Technical Specification Section. Maximum current and power capability depends on the specific
model.
3.2 Operating Modes
Available operating modes for all models are:
•Constant Current (CC) mode
•Linear Constant Current (LIN) mode
•Constant Resistance (CR) mode
A more detailed explanation of each mode and under what condition each mode is most
appropriate to use follows.
3.2.1 Constant Current Mode
This is the most commonly used mode of operating
when testing a voltage source such as an AC power
source, DC Supply or battery. In this mode of
operation, the load will sink a constant level of
current as set by the user, regardless of any voltage
variations. A real time feedback loop ensures a
stable current under any voltage variation of the
DC supply or battery.
This mode is recommended for load regulation
testing, loop stability testing, battery discharge
testing and any other form of voltage regulation
loop testing.
VOLTAGE
CURRENT
V
I

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3.2.2 Linear Constant Current Mode (LIN)
When operating in linear constant current mode,
the load current input into the 3A Series load
depends on the current setting regardless of the
input voltage, e.g., the current rms level remains
unchanged. The load current will follow the input
voltage waveform in real-time.
The LIN mode is implemented through a high-
bandwidth auto gain control circuit (ACG) and the
ACG output current control signal will track the
input voltage. The AGC circuit produces a constant
amplitude output signal so long as the amplitude of the input signal exceeds an adjustable
reference voltage applied to the peak detector. The reference voltage may be changed to
change the range of input voltage resulting in a constant-amplitude output.
The AGC circuit responds almost instantly to adjust for a sudden increase in input voltage. This
fast voltage transient response makes the LIN mode especially suitable for non-sinusoidal AC
voltage inputs such as step waveform, square waveform and any AC input voltage with a highly
distorted waveform.
3.2.3 Constant Resistance Mode (CR)
In Constant Resistance mode, the load will sink current directly proportional to the sensed DC
input voltage. The ratio between DC voltage and current is linear per ohms law and can be set
by the user within the operating range of the AC & DC load. The current is defined by the
formula shown here where R is the set value in CR mode and V is the dc input voltage from the
unit under test.
=/
CR mode is useful for battery discharge testing of battery systems used to power constant
impedance loads as the voltage will decrease as the battery discharges over time resulting in
reduced current sinking.
CURRENT I
VOLTAGE
V

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3.2.4 Current Read-back
The current levels and load status for each load module can be set from the front panel or over
the remote control interface. During testing, load input voltage and load current can be read
back but the current read back will typically display the average current level unless the dynamic
current frequency setting is low enough. An analog current monitor output is provided to allow
capturing of dynamic current on a digital storage scope or data recorder.
3.3 External Sync Mode
An analog input is provided at the rear panel of the 34M01 mainframe and four analog inputs
are provided at the rear panel of the 34M04 mainframe. These inputs allow analog
synchronization of the AC current with an external reference. Without an external sync signal,
the AC load will sink to the sensed AC input voltage using it internal zero crossing detection
circuit.
Note: This mode is supported in Constant Current (CC) and Linear Current (LIN) modes only.
3.4 Product Features
The following key characteristics apply to all 3A Series models.
•Fully programmable electronic AC & DC load module with flexible configuration and dual
range capabilities.
•Fully remote control of all load settings and metering read back.
•Dual high accuracy and high-resolution voltage and current meters.
•DC or 0.1 to 400 Hz frequency range support (CC and LIN modes).
•Power factor (PF) and crest factor (CF) control (CC mode).
•Load ON/OFF switch change and power supply turn ON.
•Internal or external voltage sensing.
•Automatic Go/NoGo testing.
•Full protection from over power, over temperature, over voltage, and reverse polarity.
•Analog current monitor output (I-Monitor).
•External sync input.
•Variable speed fan control for quiet operation.

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3.5 Accessories Included
The following accessories are included with each 3A Series AC & DC load module. If one or more
of these is missing upon incoming inspection of the product, please contact Adaptive Power
Systems customer service.
Item Quantity
Operation Manual in hardcopy or PDF Format on CD ROM
1
AC Line Cord
1
Banana Terminal, Red
1
Banana Terminal, Black
1
Voltage Sense alligator clip lead cable, Red/Black (1 meter, 39.4”)
1
M6 Round Screw
1
Certificate of Conformance
1
Table 3-1: Included Accessories
3.6 Interface Options
Following options can be ordered at time of original purchase or may be added at a later time.
Option Model No.
RS-232 Interface - Standard
34M01
RS-232 Interface - Standard
34M04
GPIB Interface Option
34M01-01
GPIB Interface Option
34M04-01
Table 3-2: Available Remote Control Interface Options

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4Technical Specifications
Technical specifications shown here apply at an ambient temperature of 25° C ± 5°. Refer to V-I curve
and Very Low Voltage V-I Curve charts by models for operating envelope.
4.1 Operating Ranges
MODEL 3A060-20 3A150-08 3A300-04
OPERATING RANGES
Power Ranges 0 - 300 VA 0 - 300 VA 0 - 300 VA
Current Ranges 0 -10Arms 10 -20 Arms 0 - 4 Arms 4 - 8 Arms 0 - 2 Arms 2 - 4 Arms
Voltage Range 10 - 60 Vrms 15 - 150Vrms 30 - 300Vrms
Frequency DC, 40 - 400Hz (CC Mode) / DC - 400Hz (LIN,CR Mode)
AC Waveforms Sine, Square, Step, DC
4.2 Operating Modes
MODEL 3A060-20 3A150-08 3A300-04
OPERATING MODES
CC Mode - High Range
0 -10Arms
10 -20 Arms
0 - 4 Arms
4 - 8 Arms
0 - 2 Arms
2 - 4 Arms
Resolution
2.5 mA
5 mA
1 mA
2 mA
0.5 mA
1 mA
Accuracy
50Hz & 60Hz: ± 0.5% OF (SETTING + RANGE) / > 60 Hz: ±(0.5% OF SETTING + 1% OF RANGE)
CC Mode - Low Range
0.000- 1.000 A
0.000- 0.400 A
0.000- 0.200 A
Accuracy
±2% OF (SETTING + RANGE)
CC Linear Mode - .
Refer to CC Modedata
CF Mode - Range
√2 - 3.5 / 1.5 - 1.9 / 3.0 - 3.4
Resolution
0.5 / 0.1 / 0.1
Lagging
-0.30 to -0.85 for CF 2.0 to 3.5
Leading
+0.30 to +0.85 for CF2.0 to 3.5
CR Mode
Range
0.3 - 1.2 KΩ 12.3 - 4.8 KΩ 1.875 - 7.5 KΩ 7.5 - 30 KΩ 7.5 - 30 KΩ 30 - 120 KΩ
Resolution
1
0.83 mS
0.2083 mS
0.13 mS
0.033 mS
0.033 mS
0.0083 mS
Accuracy
50Hz & 60Hz: ± 0.5% OF (SETTING + RANGE) / > 60 Hz: ±(0.5% OF SETTING + 2% OF RANGE)
4.3 Protection Modes
MODEL 3A060-20 3A150-08 3A300-04
PROTECTION
Over Power (OP)
315 VA
315 VA
315 VA
Over Current (OC)
10.5 A
21A
4.2 A
8.4 A
2.1 A
4.2 A
Over Voltage (OV)
63V
157.5V
315 V
Over Temperature (OT)
+85° C / +185° F
1Note: S = Siemens or mho, unit of conductance. 1S = 1/Ω = A/V

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4.4 Power Factor Range
MODEL
3A060-20
3A150-08
3A300-04
POWER FACTOR RANGE
Lagging PF
CF: √2 to 3.5 . PF: - 0.30 to -0.85
Leading PF
CF: √2 to 3.5 . PF: + 0.30 to +0.85 or 1.00
4.5 Metering
MODEL 3A060-20 3A150-08 3A300-04
METERING
Voltage Range
0 - 60V
0 - 150 V
0 - 300 V
Resolution
0.01 V
0.01 V
0.1 V
Accuracy
±(0.5% OF SETTING + 0.2% OF RANGE)
Current Range
0 - 20A
0 - 8 A
0 - 4 A
Resolution
0.01 A
0.001A
0.001A
Accuracy
50Hz & 60Hz: ± 0.5% OF (READING + RANGE) / > 60 Hz: ±(0.5% OF READING + 2% OF RANGE)
Power Range
0 - 300 W
Resolution
0.1 W
Accuracy
50Hz & 60Hz: ± 0.5% OF (READING + RANGE) / > 60 Hz: ±(0.5% OF READING + 2% OF RANGE)
Apparent Power Range
0 - 300 VA
Resolutions
0.1 VA
Accuracy
Derived from Volt and Current Measurement
4.6 Analog I/O
MODEL 3A060-20 3A150-08 3A300-04
ANALOG I/O
Current Monitor OutScale
5 A/V
2 A/V
1 A/V
Range
0 – 4 V full scale
0 – 4 V full scale
0 – 4 V full scale
Accuracy
± 0.5% OF (SETTING + RANGE)
External Sync In
Optically Isolated Input, TTL level, Zin = 330 Ohm. Requires 50% duty cycle signal-10/330
4.7 Power & Cooling
MODEL
3A060-20
3A150-08
3A300-04
AC INPUT AND COOLING SPECIFICATIONS
Power
Supplied by 34M01 or 34M04 mainframe
Cooling
Supplied by 34M01 or 34M04 mainframe

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4.8 Dimensions & Weight
MODEL
3A060-20
3A150-08
3A300-04
DIMENSIONS AND WEIGHT
Dimensions (H x W x D)
143 x 108 x 405 mm /5.6” x 4.25” x 15.9
Weight (Net)
3.5 kg /7.7 lbs
3.5 kg /7.7 lbs
3.5 kg /7.7 lbs
4.9 Environmental
MODEL
3A060-20
3A150-08
3A300-04
ENVIRONMENTAL
Operating Temperature
0 - 40° C / 32 - 104° F
Relative Humidity
80% max. non-condensing
Environmental
IndoorUse Only, Pollution Degree 2
Altitude
2000 meter / 6500 feet max. Operating
EMC & Safety
CE Mark

3A SERIES OPERATION MANUAL
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3A SERIES AC & DC LOAD OPERATION MANUAL Page 18 of 56
4.10Voltage versus Current Operating Envelope Charts
Following charts show constant power operating envelopes for each load module. Operation
below the low voltage level is not possible as the load will turn off if insufficient input voltage is
sensed.
4.10.1 Model 3A060-20 V-I Curves
Figure 4-1: Module 3A060-20 V-I Curve

3A SERIES OPERATION MANUAL
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4.10.2 Model 3A150-08 V-I Curves
Figure 4-2: Module 3A150-08 V-I Curve

3A SERIES OPERATION MANUAL
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3A SERIES AC & DC LOAD OPERATION MANUAL Page 20 of 56
4.10.3 Model 3A300-04 V-I Curves
Figure 4-3: Module 3A300-04 V-I Curve