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33200253

Instruction Manual

EL 9000 A Series

Date: 11-16-2011

Remote control

8. The analogue interface

Introduction
The analogue interface is a 15pole Sub-D socket and is

located at the rear side. It is designed to remotely control

the most important functions of the electronic load by

external hardware (eg. SPS, switches, relays) with it.
The load requires to be switched to external control

in order to use the analogue interface. This is done

by connecting Pin 7 (Remote) with ground (Pin 6) by

a jumper or switch. The status is then displayed like this:

Figure 15

Priorities
The analogue interface has priority over any other ope-

ration mode. Switching to external control can be done

in any situation (except when setup menu is active).

Hereby the set value inputs are activated and the set

values for the load can only be adjusted by means of an

external voltage source (PLC or 0...10V application) or

with potentiometers. See table „8.4. Pin assignment of

the analogue interface“) for an overview of the inputs.
Additionally, the control via the interface card is blocked

in this mode, but actual values can be read with it (i.e.

monitoring).

8.1 Important notes

For details also see „8.4. Pin assignment of the analogue

interface“.
Caution! The inputs are not protected against overvolta-

ges. Higher voltage than specified in section

8.4 on any

input of the analogue interface may damage the device!
Please read and follow these instructions carefully:
• Before connecting the hardware (with a Sub-D plug)

which is used to control the analogue interface, wire

all necessary connections and check the hardware

for not supplying >10V respectively not more than the

specified value.

• The constant resistance regulation requires all four set

values (U, I, P, R) to be fed in, if it‘s not used three set

values (U, I und P) are sufficient.

• By default, constant resistance regulation is activated!

If not used, it should be deactivated by putting a bridge

from pin 12 (R-active) to pin 6 (DGND):
Pin 12 = Low = Resistance regulation inactive

Pin 12 = High = Resistance regulation active

• If resistance regulation is used, you can select the

resistance range before or while using the analogue

interface. Pin 13 (R-Range) is used to switch between

the two ranges:
Pin 13 = Low =Resistance range 2 is used

Pin 13 = High = Resistance range 1 is used (default)

• The input Rem-SB (Remote Standby, Pin 8) overrides

the pushbutton

Input on/off(4). It means, that you

can switch the load input off with this pin at any time

(even if the load was not set to external control via the

analogue interface) and as long as this pin is tied to 0V

(ground) the load input will be permanently off and can

not be set to on with the pushbutton

Input on/off(4) or

via remote control by an interface card.

• The output VREF can be used to generate set values

for the set value inputs VSEL, CSEL, PSEL and RSEL.

For example: in case that only CC regulation is required,

the set value input VSEL has to be tied to 0V, PSEL

to VREF and CSEL can either be fed from an external

0...10V source or via a potentiometer (GND and VREF,

slider to CSEL). See also the table below.

• Adjustable rise/fall times and pulse widths like in the

Level A/B mode are not effective here. If a certain form

of amplitude-time-progression is favoured, it has to be

generated by an external function generator and fed in.

• The trigger input (Trigger In) has no function when

controlling the load via analogue interface (

External

mode

). That means that set value leaps have to be

generated with the signal that is fed in to the set value

inputs.

8.2 Example configurations

The table below shows example configurations for va-

rious single or combined regulation modes.

It always

applies, that pin 7 (Remote) always has to be pulled

to 0V (DGnd) and pin 12 (R-Active) too, if resistance

regulation is not used.
Explanation: it is not necessarily required to give a fixed

10V to any non-variable input. It can of course also be

a lower voltage in order to limit, for example, the power.

Best to tie the non-variable inputs to VREF respectively

to GND, if required.

VSEL

CSEL

PSEL

RSEL

R-active

Voltage regulation (CV)

var. 10V 10V -

Current regulation (CC)

0V var. 10V -

Power regulation (CP)

0V 10V var. -

Resistance regulation (CR) 0V 10V 10V var. H

Current & power (CC+CP)

0V var. var. -

Current & resistance (CC+CR) 0V var. 10V var. H

„var.“ = variable set value of 0...10V, which can be, of course, pulsed

in order to emulate the

Level A/B operation.

„H/L“ = High or Low, for level see table „Pin assignment of the analogue

interface“