More Bridgeport electrical advice required

Steve Walker · 2011-06-07T23:21:23+00:00

Okay, rewinding what I have is NOT ($$$) an option. From my previous post:There are 9 wires coming out of the motor, with metal number tags.1,2 and 3 all separate, I assume went to the reverse switch, which is not there.4 and 7 tied together5 and 8 tied together6 and 9 tied togetherThis allowed it to run on our 460 3 phase at the shop.Will this drop it to 230?1 and 7 tied together, use as L1 input2 and 8 tied together, use as L2 input3 and 9 tied together, use as L3 inputTie 4,5 and 6 together, insulate and tuck away.If this will work, then I can get a 230 volt input VFD, waaay cheaper than rewinding my motor.Being as how I have no diagram for the motor, I looked at a LOT of pictures & web pages, and it looks like my current wiring is pretty standard for a 460v 3 phase motor, which matches the motor plates I looked at, which had Hi and Low wiring diagrams, which is where I got the above possible solution for my Low wiring.

Jun 07, 2011 21 Replies

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ATP 15 years ago

You may be right that there are no problems, but that warning was in the Allen Bradley literature on my VFD's, so I think that puts it in a different category than alligators in NYC's sewers.

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DoN. Nichols 15 years ago

And what wattage/HP loads are you switching? The problem comes when the switched load is close to the rating of the VFD. A significantly oversized one controls the inductive kick from the switched load quite well.

I've got a VFD rated at 30A input and output, and it is quite happy with a small switched load (1 HP 240 VAC 3-phase motor) at the end of about 12 feet of cable. (Too far to run the switch contacts from the VFD to the machine.) But I would *not* do this with a VFD close to the rating of the single load being driven. *That*, I would run the switch contacts to the VFD's control terminals.

Enjoy, DoN.

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