EA ELR9750-443U, DC-electronic regenerative loads, 7 kW, 750V, 44A, #033200408

EA-ELR9750-44 3U Programmable regenerative DC electronic loads, 7 kW, 750 V, 44 A

This product is order related with an standard delivery time of approx. 9 - 11 weeks. 

The new series of electronic DC loads with energy recovery to mains, called EA-ELR 9000, offers new voltage, current and power ratings for a multitude of applications. These devices incorporate the four common regulation modes constant voltage, constant current, constant power and constant resistance. The FPGA based control circuit provides additional features, such as a function generator, a table based regulation circuit for the simulation of non-linear internal resistances. The energy recovery function converts the supplied DC energy into a synchronous sine current and feeds it back into the local grid. This eliminates the usual heat dissipation to a minimum and saves energy costs at the same time. The large colour TFT touch panel offers a different and intuitive kind of manual operation, compared to other devices. Response times for the control via analog or digital interfaces have been improved by the FPGA controlled hardware. In parallel operation of multiple devices, a master-slave bus is used to connect the units to a bigger system where the actual values are totalled and the set values distributed.

• For 1-, 2- or 3-phase supply (European and US models available)
• Energy recovery of the supplied DC energy into the local grid
• Galvanically isolated DC input
• Input power ratings 7 kW, expandable to 378 kW
• Input voltages up to 750 V
• Input currents up to 44  A 
• FPGA based digital control
• Multilingual TFT touch panel
• User profiles, true function generator
• Galvanically isolated
• Master-slave bus for parallel connection
• Extra USB port on the front for USB stick
• Optional, digital, plug & play interfaces or alternatively installed IEEE/GPIB port
• SCPI command language supported
• Optional automatic isolation unit (former german Name ENS)
• Weight 24 kg
• Dimension (W x H x D) 19” x 3U x 609 mm

POWER RATINGS, VOLTAGES, CURRENTS

The available voltage range portfolio goes from models with 0…80 V DC up to models with 0…1500 V DC. Input currents up to 510 A with only one unit are available. The series offers three power classes with 3.5 kW, 7 kW or 10.5 kW (EU models, for US models see technical specifications) in only 3U for single devices, which can be extended up to 378 kW in cabinets for a significantly high total current. Upon request, even higher total power can be realised.

SUPPLY

EU models with 3.5 kW are intended for use with 1-phase mains supplies of 230 V (L-N) , while 7 kW models require a 2-phase and 10.5 kW models a 3-phase supply. US models work with 208 V (L-L) and offer 3.1 kW, 6.2 kW or 9.3 kW power. The grid connection of european models for 230 V supply can be equipped with a supervision unit (AIU, ENS) which is optionally available, retrofittable and modular. With option „ENS2“ installed, the grid connection will become three-phase (L1, L2, L3, N, PE) for every model.

ENERGY RECOVERY

The most important feature of these electronic loads is that the AC input, i.e. grid connection, is also used as output for the recovery of the supplied DC energy, which will be converted with an efficiency of approximately 93%. This way of energy recovery helps to lower energy costs and avoids expensive cooling systems, such as they are required for conventional electronic loads which convert the DC input energy into heat.

Principle view:

Operation of these recovering loads in terms of power generation is not intended. There is an additional supervision unit (automatic isolation unit, ENS) available for optional installation and to achieve additional safety of persons and equipment, especially when running the so-called isolated operation. Regardless of whether the user has installed that supervision unit or not, the devices feature a simple and non-redundant switch-off function for the case of an interruption in the grid connection cable. The device supervises AC voltage and frequency and will automatically switch off the power stages in case upper or lower limits are exceeded.

OPERATION (HMI)

Manual operation is done with a Gorilla glass touch panel, two rotary knobs and a pushbutton. The large colour display shows all relevant set values and actual values at a glance. The whole setup is also done with the human-machine interface, as well the configuration of functions (square, triangle, sine) etc. The display is multilingual (German, English, Russian, Chinese).

FUNCTION GENERATOR AND TABLE CONTROL

A special feature is the comfortable, FPGA based, digital function and arbitrary generator. It enables to control and run user-customisable load profiles and can generate sine, square, saw tooth and ramp functions in arbitrary order. With a freely programmable, digital value table of 3276 points, which is embedded in the control circuit, the devices can reproduce non-linear internal resistances, such as those of batteries or LED chains.

SHARE BUS

The so-called „Share Bus“ is an analog connection at the rear of the devices and is used to balance current across multiple similar units in parallel connection, such as with loads of this series and series EA-ELR 9000. It can also be used to build a two-quadrants system in connection with power supplies of series EA-PSI 9000, EA-PS 9000 and EA-PSE 9000. This system is dedicated for testing purposes using the source-sink principle.

BATTERY TEST

For purposes of testing all kinds of batteries, such as for example constant current or constant resistance discharging, the devices offer a battery test mode. This show extra values for elapsed testing time and consumed capacity (Ah). Data recorded by the PC during tests with, for example, EA Power Control can be exported as Excel table in CSV format and analysed later in MS Excel or similar tools and even visualised as a discharge diagram. For more detailed setup, there is also an adjustable threshold to stop the battery test on low battery voltage, as well an adjustable maximum test period.

REMOTE CONTROL & CONNECTIVITY

For remote control, there are by default two interface ports (1x analog, 1x USB) available on the rear of the devices, which can also be extended by optional, pluggable and retrofittable, digital interface modules (dedicated slot). Alternatively to the interface modules slot, all models can be equipped with a three-way interface (option 3W, see below), which then offers 1x GPIB/IEEE, 1x USB and 1x Analog on the rear side of the device. For the implementation into the LabView IDE we offer ready-to-use components (VIs) to be used with the interface types USB, RS232, GPIB and Ethernet. Other IDEs and interfaces are supported by documentation about the communication protocol. Windows users can profit from the free software “EA Power Control”. It offers a feature called “Sequencing”, where the device is controlled through a semi-automatic table in CSV format. This table represents a simple test procedure and can be created and edited in MS Excel or other CSV editors and then imported into the software tool. This software also allows for the control of up to 20 units at once with an optional feature called “Multi Control” (licensed, not free of charge). See page 136 for more information.

OPTIONS

• Pluggable and retrofittable, digital interface modules for CAN, CANopen, Ethernet (1 or 2 ports), Profibus, ProfiNet (1 or 2 ports), RS232, EtherCAT or ModBus TCP. See page 134.
• Three-way interface (3W) with a rigid GPIB port installed instead of the default slot for retrofittable interface modules
• Automatic isolation unit, 3-phase (AIU / ENS, see page 133)

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