Weidmuller DPAMAS - Universal glavanically isolated signal co Manuel d'utilisateur Page 16

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DPA/MAS
Operation
General
The DPA/MAS allows you to monitor the difference between two
4
-20 mA signals. Trip points are set on the value of signal A minus the
value of Signal B.
Input signal isolation
Both input signals must be able to share a common return. If this is
not possible then one of the signals will need to be floated by passing
it through a signal isolator. Both signals must be in the same format
(
normally 4-20 mA).
DPA/MAS block diagram.
mA Current A
A - B
mA Current B
Alarm 1
Power
Supply
Alarm 2
24 V DC (Out)
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