running a vfd on single phase

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running a vfd on single phase

Post by treeman » Fri Feb 24, 2006 10:00 pm

Im trying to get my vfd to run on single phase.
the drive is rated for 380vac/460vac The company
told me I could use single phase if I derate the drive by 50%, which is fine because I only need 2 hp from a 5 hp drive. how do I get 308vac or 460vac
from my 120vac outlet. Is there a transformer
I could get?


<small>[ February 24, 2006, 10:01 PM: Message edited by: treeman ]</small>

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Chris Smith
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Re: running a vfd on single phase

Post by Chris Smith » Fri Feb 24, 2006 10:56 pm

How many input wires do you have?

Is your motor a brush type?

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Re: running a vfd on single phase

Post by jwax » Sat Feb 25, 2006 6:38 am

Yes, and keep in mind that 120 VAC can be lethal, but 480 VAC almost certainly is a killer.

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Re: running a vfd on single phase

Post by upsmaster » Sat Feb 25, 2006 7:09 am

1 or 3 phase 1 phase can mean 240/220/208/277 phase to phase and not always phase to neutral. i think u can find a transformer 120 to 480 but not sure big enough to support 2 horsepower but a 220/240 to 480 would be a better way to go, just be sure what 1 phase is to the drive

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Re: running a vfd on single phase

Post by Crowbar » Sat Feb 25, 2006 7:58 am

What is your motor voltage, we need to know that first. Remember that single phase capacitor motors will not operate off of VFDs. Most likely you will need a 220 3 phase motor and a 5 hp 220 VFD.
Keep Prying...


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