• Power: 900W
• Voltage: 360V
• Current: 20A
• Touch screen
• Function generator

The Elektro-Automatik EA-EL 9000 DT series are programmable DC loads, housed in a compact, desktop enclosure. Available with a variety of power, voltage and current ratings, the EA-EL 9000 DT is designed for daily use in laboratories, schools and manufacturing facilities. The following is an overview of each:

(1 Minimum DC input voltage to supply for the load to achieve the max. input current

All models support the four regulation modes constant voltage (CV), constant current (CC), constant power (CP) and constant resistance (CR). The core of the control circuit is a fast microprocessor that provides interesting features, such as a true function generator with common functions like a sine wave, rectangle or triangle, but also an arbitrary function.

The color TFT touch panel offers an intuitive manual operation, similar to what is seen with smartphones and tablets.

Response times during the control of the devices via analog or digital interface have been improved by an ARM processor-controlled hardware, compared to older electronic load series.

Digital interfaces, such as USB and Ethernet are standard with this series, as well as analog one. All interfaces are galvanically isolated. Remote control and implementation into custom applications for every purpose are simplified by the common protocols SCPI and ModBus RTU, as well as by ready-to-use LabView components.

Manual operation is done with a TFT touch panel, two rotary knobs and a pushbutton. The large color 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). 

All models within this series include a function generator that can generate typical functions, as displayed in the figures below and apply them to either the input voltage or the input current. The generator can be completely configured and controlled by using the touch panel on the front of the device, or by remote control via one of the digital interfaces.

The predefined functions offer all necessary parameters to the user, such as Y offset, time/frequency or amplitude, for full configuration ability. Additionally to the standard functions, which are all based upon a so-called arbitrary generator, this base generator is accessible for the creation and execution of complex sets of functions, separated into up to 99 sequences. These can be used for testing purposes in development and production. The sequences can be loaded from and saved to a standard USB stick via the USB port on the front panel, making it easy to change between different test sequences.

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. It counts values for elapsed testing time and consumed capacity (Ah) and energy (Wh).

Data recorded by the PC during tests with EA Power Control can be exported as an Excel table in CSV format and analyzed later in MS Excel or similar tools and even visualized as a discharge diagram. For a more detailed setup, there is also an adjustable threshold to stop the battery test on low battery voltage, as well as an adjustable maximum test period.

For photovoltaics-related tests, there is another function included as standard: MPP tracking. Four modes allow for simulation of the typical characteristics of solar inverters being connected to solar modules or panels. The function is used to determine typical operation parameters, such as the so-called Maximum PowerPoint and the related values UMPP, IMPP and PMPP. One of the modes even offers particular analysis with different irradiation values in form of a table with 100 points.

The devices of the EA-EL 9000 DT series are equipped with thermal derating in order to avoid overheating when operating in the maximum power range. The lower the ambient temperature and the better the cooling, the higher the power that the load can take. The nominal intake power before the derating starts is defined at 25°C ambient temperature. 

For remote control, there are USB, Ethernet and analog ports available as standard on the rear of the devices. Another USB port, located on the front side, is intended for USB sticks in order to load and save functions and user profiles.

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).

Options

• Mounting frame (2U) for 19" systems