I am powering some low voltage electronics from the Mains Supply via a transformer. I want redundancy in the supply i.e two sources of mains power (not UPS, they must be two seperately wired supplies) and I want to detect when source#1 has disappeared.
I have been using a relay to switch between the two sources but get so much kickback from the inductive load that I decided to go solid state.
So now I'm using triacs to switch source#1 whereas source#2 is permanently connected (both sources are in phase).
However when I disconnect source#1 I can still measure 240V across the terminals and thus cannot detect that it has failed.
Why then do the triacs allow source #2 to switch them on?
I have been using a relay to switch between the two sources but get so much kickback from the inductive load that I decided to go solid state.
So now I'm using triacs to switch source#1 whereas source#2 is permanently connected (both sources are in phase).
However when I disconnect source#1 I can still measure 240V across the terminals and thus cannot detect that it has failed.
Why then do the triacs allow source #2 to switch them on?
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