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#211445 - 10/13/13 05:58 PM 3 phase voltage monitor with 2 levels of alerts?
LarryC Offline

Registered: 07/05/04
Posts: 776
Loc: Winchester, NH, US
For a new project, I am looking for a 3 phase L-N voltage monitor relay that has two levels of outputs. First level will be used for a warning alert, the second level will initiate system shutdown.

One approach is using two monitoring relays and use different settings, but I would prefer a single unit if available. Power will be 400/230 V, 50 and 60 Hz.


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#211446 - 10/13/13 07:05 PM Re: 3 phase voltage monitor with 2 levels of alerts? [Re: LarryC]
JoeTestingEngr Offline

Registered: 11/04/05
Posts: 786
Loc: Chicago, Il.
What about using the 3 phase PLM on the high side and a single phase adjustable relay on your ctl ladder? I haven't seen any that have 2 steps of O/P


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