Category: Computers and Hardware
I probably when OTT with power supplies.
What I did was use some light weight DPDT relays, one set of contacts latches the relay after briefly being energised by a pushbutton and the other set of contacts controls a contactor with a 24v coil. I find this a great because if the power is removed, blackout breaker tripping, and comes back on the power doesn't come back on.
I went with a relay > contactor setup as I wanted to keep the 240 seperated from the 24v control. The only issue is that there is an always on 24v supply dedicated to the relays.
To clarify there's one relay/contactor per power supply. Each power supply can be independently controlled. For wiring the latching relay I had some PCBs made to simplify the wiring.
Bit more involved than a 4 way gang switch. The same thing could be implemented with a NVR switch for each PSU.
Oh I forgot I'm series with each pushbutton is another switch, this is used to turn the relay off and has to be in the "on" position before pushing the button to turn the power supply on. It's kind of like starting a rocket.
