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Wiring for single phase drive

Wiring for single phase drive

Wiring for single phase drive

(OP)
I want to use a 480/240:120 stepdown xfmr to feed my reliance single phase DC regen drive. If I connect X1 & X4 to the drive as the 240V supply, and X3 & X2 to ground, will I be able to use X1 & gnd as the control circuit power for the drive? My concern is that X1 & X4 will be floating. Therefore, when I ground the drive chassis will it mess up the drive? Please advise.

RE: Wiring for single phase drive

My opinion: If X3 & X2 are grounded, then X1 and X4 are not floating, they have now a reference to ground. Now, not X1 nor X4 can  be connected  to ground (if for whatever reason it should be required), because you will create a short circuit to ground.

RE: Wiring for single phase drive

(OP)
Thanks aolalde!

Herein lies the reasoning that X4 could possibly ground, if internally in the drive L2 is somehow connected to the chassis for grounding purposes. I suppose this is possible?

RE: Wiring for single phase drive

This may be off the path.........

I have used DC regens that the control voltage, 10vdc, inputs would have a  high voltage potential to ground.  This caused a particular problem with the analog input command which was referenced to ground in our controller.  ZAP went a quad op-amp!  The best solution we had at the time was to isolate each drive with it's own transformer 1:1 from ground.

As I said this may be off path but your questions seem to indicate your having a gounding problem of some kind.  What problems are you having?

Barry1961

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