User manual

Page 58
PSI 9000 DT Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
• Remote control is not active
In this mode of operation pin “REM-SB” can serve as lock, preventing the DC output from being switched on by
any means. This results in following possible situations:
DC
output
+
Pin
„REM-SB“
+
Parameter
„Rem-SB“

Behaviour
is off
+
HIGH
+
normal

DC output not locked. It can be switched on by pushbutton “On/Off”
(front panel) or via command from digital interface.
LOW
+
inverted
+
HIGH
+
inverted

DC output 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 output is already switched on, toggling the pin will switch the DC output off, similar to what it does
in analog remote control:
DC
output

Pin
„REM-SB“
+
Parameter
„Rem-SB“

Behaviour
is on

HIGH
+
normal

DC output remains on, nothing is locked. It can be switched on or
off by pushbutton or digital command.
LOW
+
inverted

HIGH
+
inverted

DC output will be switched off and locked. Later it can be switched
on again by toggling the pin. During lock, pushbutton or digital com-
mand 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
power supply can selectively work in current limiting or power limit-
ing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 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 output values as current and voltage monitor. These can be
read using a standard multimeter or similar.