User manual

Page 43
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
EL 9000 T 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-
input
+
Pin
„REM-SB“
+
Parameter
„REM-SB“

Behaviour
is off
+
HIGH
+
normal

DC input not locked. It can be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface.
LOW
+
inverted
+
HIGH
+
inverted

DC input locked. It can not be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface. When trying to
switch on, a popup in the display resp. an error message will be
generated.
LOW
+
normal
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-
input

Pin
„REM-SB“
+
Parameter
„REM-SB“

Behaviour
is on

HIGH
+
normal

DC input remains on, nothing is locked. It can be switched on or off
by pushbutton or digital command.
LOW
+
inverted

HIGH
+
inverted

DC input will be switched off and locked. Later it can be switched on
again by toggling the pin. During lock, pushbutton or digital command
can delete the request to switch on by pin.
LOW
+
normal
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 po-
tentiometers for each. Hence the electronic load can
selectively work in current limiting or power limiting
mode.Accordingto thespecication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 inuence 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).
Example with
external voltage
source
Example with
potentiometers
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.