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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
PSB 9000 3U Series
• Remote control has not been activated
In this mode of operation pin “REM-SB” can serve as lock, preventing the DC terminal from being switched on by
any means. This results in following possible situations:
DC
terminal
+
Pin
„REM-SB“
+
Parameter
„Rem-SB“
Behaviour
is off
+
HIGH
+
normal
DC terminal not locked. It can be switched on by pushbutton “On/
Off” (front panel) or via command from digital interface.
LOW
+
inverted
+
HIGH
+
inverted
DC terminal 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 terminal is already switched on, toggling the pin will switch the DC terminal off, similar to what it
does in analog remote control:
DC
terminal
Pin
„REM-SB“
+
Parameter
„Rem-SB“
Behaviour
is on
HIGH
+
normal
DC terminal remains on, nothing is locked. It can be switched on
or off by pushbutton or digital command.
LOW
+
inverted
HIGH
+
inverted
DC terminal 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
power supply 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 VREF and will
thus be permanently 100%. This also means that the device can only
work in source mode.
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 terminal values as current and voltage monitor. These can be
read using a standard multimeter or similar.
d) Switching between source and sink mode
You can also switch between both modes when remotely controlling the device with the AI. This is done using the
voltage set value (VSEL), which then must not be tied to a fixed potential, like shown in example b). Rules:
•
if the voltage set value on VSEL (in %, not the level) becomes higher than the actual voltage on the DC terminal,
the device will switch to sink mode, no matter if the voltage on the DC terminal is generated by the device or
from external
•
if if the voltage set value becomes lower than the actual voltage, the device will switch to source mode
