Electronic Loads Type : VEL 250 / VEL 500 / VEL 1000 / VEL 2000
Description
VEL 250 up to VEL 2000 are electric loads with manual and programmable operation and respective maximum power ranges between 50 and 2000 W. They are used in various applications (e.g. training, research, development, laboratories, inspection, production, test field, quality assurance) for fast and precise simulation of voltage loads. They are useful for e.g. static and dynamic power supply and battery testing. These electronic loads easily simulate a multitude of load applications. Simple and clear operation of electronic loads is achieved via operation mode switch.
VEL 250
Features
Comprehensive protections such as electronic power limitation, overvoltage and excessive current protection, reverse polarity and over temperature protection prevents the instrument being damaged in error.
Fault and error messages are displayed via LED and can be output via electrically isolated message outputs.
Diplay : 3 digit, display for current and voltage.
The inputs are without earth so that one of the socket may be grounded, if required.
Safety sockets in compliance with DIN IEC 61010 / EN 61010.
Clear front panel layout with display and control unit.
Comprehensive instruction manual.
Main voltage 230 V.
Construction of all transformers used, is in compliance with IEC 61558-1.
Electrical safety complying with IEC 61010, EN61010, DIN VED 0411.
Temperature range : all parameters are guaranteed within a range of 15 to 40o C.
Reliability
All electronic loads are designed for continuous operation and are subject to strict quality controls. For example, each instrument is additionally tested during 24 hours at nominal load and at 45 C ambient temperature following successful functional tests.
Electronic Loads
VEL 250 / VEL 500 / VEL 1000 / VEL 2000
Electronic loads in bench version from 250 to 2000 Watt.
Information
Two separate digital display for load voltage and current.
Constant current and resistance mode in two ranges infinitely adjustable via high resolution 10-turn potentiometer.
Analogue control input for constant current pre-setting.
Adjustable pulse load operation with 100 Hz and 1 kHz enables easy, dynamic UUT load application.
Internal power limitation and further comprehensive protective features.
Electonic loads for applications in research and testing (e.g. solar engineering)
Features
IEEE-488 interface for integration in computer controlled systems (optional for EL 500)
Integrated current monitor output enables control and recording of load current via external measurement instrument, such as recorder or oscilloscope.
Specification
Model
VEL250
Common features
VEL500
Standard Version
: 60 V / 40 A
: 60 V / 50 A
Max. Power
: 250 W
: 500 W
Load Voltage
: 1...60 V
: 1...60 V
Constant current Operation
Range / Resolution
: 5 mA....40 A / < 20 mA
: 5 mA...50 A / < 20 mA
Constant Resistance Operation Range
: approx. (200 Ohm ....100m Ohm)
: approx. (400 Ohm ...70 mOhm)
Current increase (o...100%)
: < 60 µs
Current Stability
: < 0.25 % (8h)
3 Digit LED-display for Load current and Load Voltage :
Range/Resolution
: -9.9...9.99 A / 100 mA
Range/Resolution
: -9.9...9.99 V / 100 mV
Cooling
: Electronically controlled fan system
Nominal Temperature Range
: + 15 ... + 40 Deg. C
Power Supply Voltage
: 230 V ± 10% / 50 - 60 Hz
Power Consumption
: approx. 18 VA
: Approx. 18 VA
Dimension W x H x D in mm
: 326 x 144 x 240
: 466 x 170 x 340
Weight
: approx. 6 kg.
: approx. 12 kg.
Specification
Model
VEL1000
Common features
VEL2000
Standard Version
: 30 V / 100 A
: 30 V / 200 A
Max. Power
: 1000 W
: 2000 W
Load Voltage
: 1..30 V
: 1..30 V
Constant current Operation
Range / Resolution
: 5 mA....100 A / < 30 mA
: 5 mA...200 A / < 60 mA
Constant Resistance Operation Range
: approx. (200 Ohm ....40 mOhm)
: approx. (100 Ohm ...20m Ohm)
Current increase (o...100%)
: < 150 µs
Current Stability
: < 0.25 % (8h)
3 Digit LED-display for Load current and Load Voltage :
Range/Resolution
: -99...999 A / 1 A
Range/Resolution
-9.9...99.9 V / 100 mV
Cooling
: Electronically controlled fan system
Nominal Temperature Range
: + 15 ... + 40 Deg. C.
Power Supply Voltage
: 230 V ± 10% / 50 - 60 Hz
Power Consumption
: approx. 18 VA
: Approx. 50 VA
Dimension W x H x D in mm
: 466 x 170 x 340
: 466 x 285 x 400
Weight
: approx. 14 kg.
: approx.25 kg.
Applications
Parallel Operation
Parallel connection of several instruments with individual instrument settings extends current or power consumption.
AC Voltage Sources Electronic loads are pure DC voltage loads. The input voltage must first be rectified for load application of an AC power supply, e.g. mains transformers or power amplifiers.
