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PS 9000 1U Series
PS 9000 1U Series • DC Laboratory Power Supply • User Manual
3.5.4.5
Simplified diagram of the pins
+
Digital Input (DI)
The internal circuit requires that a switch
with low resistance should be used (relay,
switch, circuit breaker etc.) in order to
send a clean signal to the DGND.
A digital output from a circuit or PLC may
not be sufficient if not an “open collector”.
V~0.5
AGND
Analog Input (AI)
High resistance input (impedance
>40 k....100 kΩ) for an OA circuit.
4.
7k
12V
+10V
Digital Output (DO)
A quasi open collector, realised as high
resistance pull-up against the internal sup-
ply. In condition LOW it can carry no load,
merely switch, as shown in the diagram
with a relay as example.
V~2
AGND
Analog Output (AO)
Output from an OA circuit, only mini-
mally impedant. See specifications
table above.
3.5.4.6 Application examples
a) Switching off the DC output via the pin “REM-SB”
A digital output, e.g. from a PLC, may be unable to cleanly pull down
the pin as it may not be of low enough resistance. Check the speci-
fication of the controlling application. Also see pin diagrams above.
In remote control, pin REM-SB is be used to switch the DC output of the device on
and off. From KE firmware version 2.03, this is also available without remote control
being active.
It is recommended that a low resistance contact such as a switch, relay or transistor is
used to switch the pin to ground (DGND).
The following situations can occur:
• Remote control has been activated
During remote control through the analog interface, only pin “REM-SB” determines the states of the DC output,
according to the levels definitions in
3.5.4.3
. The logical function and the default levels can be inverted by a pa-
rameter in the setup menu of the device. See
3.4.3.1
.
If the pin is unconnected or the connected contact is open, the pin will be HIGH. With parameter
“Analog interface REM-SB” being set to “normal”, it requests “DC output on”. So when activating
remote control, the DC output will instantly switch on.
• 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 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
Summary of Contents for PS 9080-100 1U
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