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Fitting single phase 24v dc smp to a 3 phase system.

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engineer1000

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I have a cabinate controlling a 3 phase motor. I need to fit a single phase 24vdc out smp in the cabinate. Do I connect the input of the smps between two of the phases to get 240Vac or do I connect between neutral and one of the phases to get 120vac?
I think this is probably a conventional way of doing this but can't find anything on google
 

If your SMP can run of 120V its safer to connect it to one live and neutral. One fuse and one isolator in the line feed. If you feed it live and live, you need two fuses and a double pole isolator. Also I have have come across a SMP where switching the live and neutral to it caused it to fail. Ya, I know it should not make any difference, but the RFI filter caps could be different voltage working.
Frank
 

engineer1000 said:
I have a cabinate controlling a 3 phase motor. I need to fit a single phase 24vdc out smp in the cabinate. Do I connect the input of the smps between two of the phases to get 240Vac or do I connect between neutral and one of the phases to get 120vac?
I think this is probably a conventional way of doing this but can't find anything on google
Click to expand...

In N. America a 3 phase 120Vac source is 208Vac from phase-phase. not 240Vac as it is in residential single phase center-tapped.
 

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