User Manual
72
© 2006, Elektro-Automatik GmbH & Co. KG
Irrtümer und Änderungen vorbehalten
EN
Instruction Manual
PSI 8000 3U Series
Date: 03-22-2011
Operating the device
Attention! Never connect grounds of the analogue
interface to minus (negative) output of an external
control application (PLC, for example), if that control
application is otherwise connected to the negative
power supply output (ground loop). Load current may
ow over the control leads and damage the device!
Figure 11
Figure 12
10.3 Example applications
Output off
Pin „REM-SB“ is always operative and does not depend on the
remote mode. It can thus be used to switch off the output without
extra means. Switching the output off is done by connecting the
pin to ground (DGND) via a low-resistive contact like a switch,
open collector transistor or relay.
Note: a digital output of, for example, a PLC may not be able
to perform the action correctly, because it might not be low-
resistive enough. Always check the technical specications of
your external control application.
Remote control of current and voltage
Note: Remote control via analogue interface always requires
to put all three set values.
Two potentiometers between VREF and ground, sliders at the
inputs VSEL and CSEL. Power set value PSEL is tied to VREF
and thus set to 100%. The power supply can be controlled as
with the rotary knobs on the front and can either operate as
current or voltage source. In compliance with the max. 5mA
for the VREF output, potentiometers with at least 4.7kOhm
should be used.
Alternatively, external voltage sources can be used to control
the set value input (second example).
or
Remote control with power
Similiar to the example above, but with adjustable power limit.