Wiring A 3 Phase Fail Relay To An Ab Input Card

TURG said:
The situation is: I have a mains power supply that is linked to a back up UPS, if mains power is lost. The relay has been wired up so that if the mains power is lost and we go over to the UPS,
the relay switches over from being NC to NO, this triggers an alram on a SCADA screen notifying an operator.

I can set up the alarm ok. Its just knowing what initial line of ladder i need to write.

Many Thanks
Click to expand...

why not let your scada tell the plc that you're running on UPS?

less wiring = less confused guys calling at 3AM...
 

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