Ea Elektro Automatik EA Elektro-Automatik EA-ELR 9250-140 3U Electronic Load 0 - 140 A 0 - 250 Vdc 0 - 7000 W 33200406 データシート

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EA Elektro-Automatik GmbH

Helmholtzstr. 31-33 • 41747 Viersen

Germany

Fon: +49 2162 / 3785-0

Fax: +49 2162 / 16230

3.5.3.2  General information about the interface modules
With the standard models of series ELR 9000, one of the plug-in and retrofittable modules listed in 3.5.3.1 can 

be installed. It can take over remote control of the device alternatively to the built-in USB type B on the back side 

or the analog interface. For installation see section „1.9.8. Interface module slot“ and separate documentation.
The modules require little or no settings for operation and can be directly used with their default configuration. 

All specific settings will be permanently stored such that, after changeover between the various models, no re-

configuration will be necessary.
Changing to remote control will retain the last set values for the device until these are changed. Thus a simple 

voltage control by setting a target value is possible without changing any other values.
3.5.3.3  Programming
Programming details for the interfaces, the communication protocols etc. are to be found in the documentation 

“Programming Guide ModBus & SCPI“ which is supplied on the included CD or which is available as download 

from the EA Elektro-Automatik website.

3.5.4.1  General
The built-in, galvanically separated, 15-pole analog interface (short: AI) is on the back side of the device offers the 

following possibilities:
•

Remote control of current, voltage and power

•

Remote status monitoring (CC/CP, CV)

•

Remote alarm monitoring (OT, OVP)

•

Remote monitoring of actual values

•

Remote on/off switching of the DC input

Setting the 

three set values via the analog interface always takes place concurrently. It means, that for example 

the voltage can not be given via the AI and current and power set by the rotary knobs, or vice versa. 
The OVP set value and other supervision (events) and alarm thresholds cannot be set via the AI and therefore 

must be adapted to the given situation before the AI is put in operation. Analog set values can be fed in by an ex-

ternal voltage or generated by the reference voltage on pin 3. As soon as remote control via the analog interface 

is activated, the values displayed will be those provided by the interface.
The AI can be operated in the common voltage ranges 0...5 V and 0...10 V in each case 0...100% of the nominal 

value. The selection of the voltage range can be done in the device setup. See section „3.4.3. Configuration via 

MENU“ for details. 
The reference voltage sent out from Pin 3 (VREF) will be adapted accordingly and is then:
0-5 V: Reference voltage = 5 V, 0...5 V set values (VSEL, CSEL, PSEL) correspond to 0...100% nominal values, 

0...100% actual values correspond to 0...5 V at the actual value outputs (CMON, VMON).
0-10 V: .Reference voltage = 10 V, 0...10 V set values (VSEL, CSEL, PSEL) correspond to 0...100% nominal values, 

0...100% actual values correspond to 0...10 V at the actual value outputs (CMON, VMON).
Input of excess set values (e.g. >5 V in selected 5 V range or >10 V in the 10 V range) are clipped by setting the 

set value at 100%.

Before you begin, please read. Important notes for use of the interface:
•

Analog remote control of the device must be activated by switching pin “REMOTE” (5) first. Only exception is 

pin REM-SB, which can be used independently since KE firmware version 2.07

•

Before the hardware is connected that will control the analog interface, it shall be checked that it can’t provide 

voltage to the pins higher than specified

•

Set value inputs, such as VSEL, CSEL and PSEL, must not be left unconnected (i.e. floating)

•

It is always required to provide all three set values at once. In case any of the set values is not used for adjust-

ment, it can be tied to a defined level or connected to pin VREF (solder bridge or different), so it gives 100%