Author: glen herrmannsfeldtglen herrmannsfeldt
Date: Oct 21, 2007 21:21
scada wrote:
> "athenanews" gillsteve.giointernet.co.uk> wrote in message
> news:40d307bc$1_4@news.athenanews.com...>>Please can anybody suggest the best route for doing this. Ideally we would
>>like a simple flag to let us know if we lose any phases. The flag would
(snip)
> Two relays rated at the phase to phase voltage. Wire the coil of relay1
> across phases A-B. Wire the coil of relay2 across phases B-C. Wire the NO
> contacts of each relay in series with both relays, and DC power supply
> (5-12V). Now you will loose the 5-12V upon phase loss.
You should check that the relays drop out with only two legs
active. There might still be enough to hold them in.
-- glen
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