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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
EL 9000 B 15U/24U Series
• Remote control has not been activated
In this mode of operation pin “REM-SB” can serve as lock, preventing the DC input from being switched on by any
means. There are 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’t 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 potentiometers for each. Hence the
device can selectively work in current limiting or power limiting 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 VREF and will
thus be permanently 100%.
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 oder 0...10 V).
Use of the input voltage range 0...5 V for 0...100%
set value halves the effective resolution.
Example with external
voltage source
Example with
potentiometers
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, as well as electronic data acquisition hardware.
