Elektro-Automatik ELR 9000 Betriebsanleitung Seite 152

ELR 9000 Series
• Remote control is not active
In this mode of operation pin "REM-SB" can serve as lock, preventing the DC input from being switched on by any
means. This results in following possible situations:
DC- Pin
+ +
input „REM-SB"
+
HIGH
+
+
LOW
is off
+
HIGH
+
+
LOW
In case the DC input is already switched on, toggling the pin will switch the DC input off, similar to what it does in
analog remote control:
DC- Pin

input „REM-SB"
HIGH

LOW
is on
HIGH

LOW
b) Remote control of current and power.
Requires remote control to be activated (Pin "Remote" = LOW)
The set values PSEL and CSEL are generated from, for example, the
reference voltage VREF, using potentiometers for each. Hence the
electronic load can selectively work in current limiting or power limit-
ing mode. According to the specification of max. 5 mA for the VREF
output, potentiometers of at least 10 kΩ must be used.
The voltage set value VSEL is directly connected to AGND (ground)
and therefore has no influence on constant current or power operation.
If the control voltage is fed in from an external source it is necessary
to consider the input voltage ranges for set values (0...5 V or 0...10 V).
Use of the input voltage range 0...5 V for 0...100%
set value halves the effective resolution.
c) Reading actual values
The AI provides the DC input values as current and voltage monitor. These can be read
using a standard multimeter or similar.
EA Elektro-Automatik GmbH
Page 62
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Parameter
 Behaviour
„REM-SB"
DC input not locked. It can be switched on by pushbutton "On/Off"
normal
(front panel) or via command from digital interface.

inverted
DC input locked. It can not be switched on by pushbutton "On/Off"
inverted
(front panel) or via command from digital interface. When trying to

switch on, a popup in the display resp. an error message will be
normal
generated.
Parameter
+
 Behaviour
„REM-SB"
+
DC input remains on, nothing is locked. It can be switched on or
normal
off by pushbutton or digital command.

+
inverted
+
DC input will be switched off and locked. Later it can be switched
inverted
on again by toggling the pin. During lock, pushbutton or digital

+
normal
command can delete the request to switch on by pin.
Example with
external voltage
source
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
Example with
potentiometers
www.elektroautomatik.de
ea1974@elektroautomatik.de