What would the single phase current draw be for a 3 phase 70 amp FLC motor running on a single phase to three phase converter? I assume it would be different on the single phase side than it would be on the three phase side of the phase converter, right?
Motor current on phase converter
- Thread starter ammklq143
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In my experience it wouldn't work.
The control cabinet for the motor has a VFD that converts single phase to three phase.
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In my experience it's about double on the single phase side.
Double looks about right.
Here's a pretty good website to help you.
www.americanrotary.com
Here's a pretty good website to help you.
AR Pro Series Rotary Phase Converter - American Rotary
AR General Purpose - The AR Rotary Phase Converter provides utility grade power and is designed for light/medium duty general purpose loads.
www.americanrotary.com
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Multiply the 3 phase current by the square root of 3 (1.732). So if it is 70A at 3 phase, it will be drawing 121A from the single phase line.
Plus the inefficiencies in the phase converter, which might be significant at that size. I would add another 5% to be sure.
Plus the inefficiencies in the phase converter, which might be significant at that size. I would add another 5% to be sure.
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Electron manager
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What type of phase converter?
In perfect world it would be total VA divided by the single phase voltage. With an solid state converter (VFD or inverter) it may be fairly close to that value. With rotary or static phase converter output current won't likely be that balanced, motors would need to be derated because of this, and the converter would also have some inefficiencies that add to the draw from the input.
In perfect world it would be total VA divided by the single phase voltage. With an solid state converter (VFD or inverter) it may be fairly close to that value. With rotary or static phase converter output current won't likely be that balanced, motors would need to be derated because of this, and the converter would also have some inefficiencies that add to the draw from the input.
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