Hi! i just wondering why we got low insualtion alarm in the UPS panel ( 24vdc) if all the transmitters are connected. we tried to disconnected all 5 transmitters then the alarm is gone in the UPS panel. PLC supply coming from UPS. pressure trnasmitter connected to plc for alrma & monitoring purposes. any thoughts about this. I think the circuit of pressure transmitter giving low insulation if connected to ups 24 vdc, is that possible? pls need some advise. thanks a lot.

toper

 

Your 24 VDC is likely grounded at some point. I suspect at the PLC - 24VDC (on purpose).
The UPS interprets a current to ground as "Low Insulation".

It might be possible to have the PLC, without more details it's hard to say.

Roy