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Title: 3-phase power or Single phase to a power supply? Does it matter? Post by: VentMine on February 03, 2017, 07:33:23 PM I'm a dummy and want to understand if the power input to a power supply, such as the Bitmain's APW3+ PSU, requires single phase AC or can it be 3 Phase AC?
Spec's on Bitmains website: Input Voltage Range 176-264V AC Starting Voltage 200-205V AC Frequency Range 47-63Hz ... Can I supply 208V-3PH supply to this PSU or must it be single phase at the appropriate voltage? Cheers Title: Re: 3-phase power or Single phase to a power supply? Does it matter? Post by: sidehack on February 03, 2017, 07:35:36 PM The PSU will only take in a single hot line. If you span two legs of a 3-phase system for 208V it works just fine. My entire hosting is set up like that.
Title: Re: 3-phase power or Single phase to a power supply? Does it matter? Post by: Colohub on February 03, 2017, 11:39:26 PM single phase or 3 phase will work just fine, the voltage just needs to be over 200 for that power supply :)
Title: Re: 3-phase power or Single phase to a power supply? Does it matter? Post by: sidehack on February 04, 2017, 01:38:04 AM Technically not a correct answer, since the PSU doesn't accept 3-phase power. Only a single "phase" is used per PSU; whether that's 240V line-line (or, less likely, line-neutral) or 208V line-line is up to the end user's particular implementation. Of course this is based on a strict parsing of the OP's question, which may not read as he intended it to mean.
But the part about any AC over 200V is right, so pulling 208V from a three-phase installation works just fine. Title: Re: 3-phase power or Single phase to a power supply? Does it matter? Post by: VentMine on February 04, 2017, 03:46:05 PM Right on, I understand. Yes agree my question was worded poorly due to my own confusion. Thanks
Title: Re: 3-phase power or Single phase to a power supply? Does it matter? Post by: Finksy on February 06, 2017, 04:59:03 AM The easiest way to use 3-phase power for PSU's is to use a 3-phase specific PDU's which -as sidehack mentioned- breaks power into 3 pairs of phases to obtain line-line 208V (or whatever voltage your 3P is) + ground single-phase equivalent. The only important thing to note is that the 3 legs of the PDU (colour-coded for simplicity) need to stay as balanced as possible.
Title: Re: 3-phase power or Single phase to a power supply? Does it matter? Post by: sidehack on February 06, 2017, 05:39:50 AM My hosting is set up with 3phase, where I have pulls from two phases dropped to a two-pole subpanel on each shelf breaking out customer circuits (at 208V). There are current meters on each leg at the junction box so I can keep everything reasonably balanced, also shows me what shelves have available power for new gear. Not fancy at all but works out pretty well.
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