Ea Elektro Automatik EA Elektro-Automatik EA-ELR 9250-210 3U Electronic Load 0 - 210 A 0 - 250 Vdc 0 - 10500 W 33200411 Ficha De Dados

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EA Elektro-Automatik GmbH

Helmholtzstr. 31-33 • 41747 Viersen

Germany

Fon: +49 2162 / 3785-0

Fax: +49 2162 / 16230

3.5.4.2  Acknowledging device alarms
Device alarms (see 3.6.2) are always indicated in the front display and some of them are also reported as signal 

on the analog interface socket (see table below).
In case of a device alarm occurring during remote control via analog interface, the DC input will be switched off 

the same way as in manual control. While alarms OT and OV can be monitored via the corresponding pins of the 

interface, other alarms like power fail (PF) can’t. Those could only be monitored and detected via the actual values 

of voltage and current being all zero contrary to the set values.
All device alarms (OT, OV, PF, OCP and OPP) have to be acknowledged, either by the user of the device or by the 

controlling unit. Also see „3.6.2. Device alarm and event handling“. Acknowledgement is done with pin REM-SB 

switching the DC input off and on again, means a HIGH-LOW-HIGH edge (min. 50ms for LOW).
3.5.4.3  Analog interface specification

Pin Name

Type* Description

Default levels

Electrical properties

1 VSEL

AI

Set voltage value

0…10 V or. 0...5 V corre-

spond to 0..100% of U

Nom

Accuracy < 0.2% *****
Input impedance R

i

 >40 k...100 k

2 CSEL

AI

Set current value

0…10 V or. 0...5 V corre-

spond to 0..100% of I

Nom

3 VREF

AO

Reference voltage 10 V or 5 V

Tolerance < 0.2% at I

max

 = +5 mA 

Short-circuit-proof against AGND

4 DGND

POT Ground for all 

digital signals

For control and status signals.

5 REMOTE

DI

Switching internal /

remote control

Remote = LOW, U

Low 

<1 V 

Internal = HIGH, U

High

 >4 V 

Internal = Open 

Voltage range = 0…30 V 

I

Max

 = -1 mA bei 5 V 

U

LOW to HIGH typ.

 = 3 V 

Rec’d sender: Open collector against DGND

6 OT

DO

Overheating or 

power fail*** alarm

Alarm OT= HIGH, U

High

 > 4 V 

No Alarm OT= LOW, U

Low 

<1 V

Quasi open collector with pull-up against Vcc ** 

With 5 V on the pin max. flow +1 mA  

I

Max 

= -10 mA at U

CE 

= 0,3 V 

U

Max 

= 30 V 

Short-circuit-proof against DGND

7 -

-

-

-

-

8 PSEL

AI

Set power value

0…10 V or. 0...5 V corre-

spond to 0..100% von P

Nom

Accuracy < 0.2% ***** 

Input impedance R

i

 >40 k...100 k

9 VMON

AO

Actual voltage

0…10 V or. 0...5 V corre-

spond to 0..100% von U

Nom

Accuracy < 0.2% at I

Max

 = +2 mA 

Short-circuit-proof against AGND

10 CMON

AO

Actual current 

0…10 V or. 0...5 V corre-

spond to 0..100% von I

Nom

11 AGND

POT Ground for all 

analog signals

For -SEL, -MON, VREF Signals

12 -

-

-

-

-

13 REM-SB

DI

DC input OFF

(DC input ON)

(ACK alarms ****)

Off = LOW, U

Low 

<1 V 

On= HIGH, U

High

 >4 V 

On = Open

Voltage range = 0…30 V 

I

Max

 = +1 mA at 5 V 

Rec’d sender: Open collector against DGND

14 OVP

DO

Overvoltage alarm Alarm OV = HIGH, U

High

 > 4 V 

No alarm OV = LOW, U

Low 

<1 V

Quasi open collector with pull-up against Vcc ** 

With 5 V on the pin max. flow +1 mA  

I

Max 

= -10 mA at U

CE 

= 0,3 V, U

Max 

= 30 V 

Short-circuit-proof against DGND

15 CV

DO

Constant voltage 

regulation active

CV = LOW, U

Low 

<1 V 

CC/CP/CR = HIGH, U

High 

>4 V

* AI = Analog Input, AO = Analog Output, DI = Digital Input, DO = Digital Output, POT = Potential     ** Internal Vcc approx. 10 V

*** Mains blackout, mains over- or undervoltage or PFC error     **** Only during remote control    ***** The error of a set value input adds to the general error 

of the related value on the DC output of the device