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Have a 3 phase compressor model vr5-8 want to know if it can be converted to single phase 230 volt and how

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A 3phase motor cannot be rewired to run on single phase power. You need a phase converter. A 3-phase motor will only run on 3-phase power, and a phase converter will convert single phase power to 3 phase. Just google phase converter. There are two basic types, electronic and rotary. The rotary type are more powerful and efficient, but lot's more expensive than the electronic ones. Your only other option is to replace the motor with a single phase motor. Good luck.

Posted on May 18, 2011

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In all seriousness consult your yellow pages for an electrician. Depending on the exact model the motor could be 208 volts, 230 volts, or 460 volts, and single phase or three phase electrical service, any of which will cause serious injury or death to anyone not familiar with commercial electrical systems.





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You can build or buy a single to three phase converter....

http://www.metalwebnews.com/howto/ph-conv/ph-conv.html

If you want to buy then just do a search and many will come up...

You size them by amp. draw... the amp. draw will be listed on the motor nameplate...

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1 Answer

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When you google home made 3 phase converters, you will find many ways to make use of 220v single phase instead, however you are limited as to the hp that the motor will produce. If you spin the motor first then apply 220v, the motor will continue to turn at much reduced hp. You need full power to turn a type 30 pump depending on pulley combination/ setup. Best to return the unit and get one that will run on 220v single phase. It will most likely consume more power to do the same work however it would cost a great deal to install 3 phase. Most likely not even available at all. Many years ago, I worked at Sears and happened to see an electrician coming down from roof access of building. He told me that sears had a 3 phase generator being turned by a 220v single phase motor to run an air conditioning unit. He said that it worked quite well. Does not sound cost effective.

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1 Answer

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