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Phase Convertor Sizing #195763 08/20/10 04:18 PM
Joined: Mar 2003
Posts: 849
Y
Yoopersup Offline OP
Member
MCA 74 on compressor unit (all mts taken into account).
240 v single phase to 240 v 3 phase.
40 hp convertor .
input Aprox 127 amps
outputaprox 100 amps.
Comments???
Yoopersup

2017 / 2014 NEC & Related Books and Study Guides
Re: Phase Convertor Sizing [Re: Yoopersup] #195777 08/22/10 03:10 AM
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
I'm guessing you're looking at a rotary converter. Do the motors need to be de-rated? The math looks off between single phase input and 3 phase output.

Re: Phase Convertor Sizing [Re: twh] #195779 08/22/10 12:15 PM
Joined: Jan 2001
Posts: 1,044
Tom Offline
Member
Any chance of doing this with VFD's? Appropriately sized VFD's can convert a single phase input to three phase.


Few things are harder to put up with than the annoyance of a good example.
Re: Phase Convertor Sizing [Re: Tom] #195780 08/22/10 02:18 PM
Joined: Mar 2003
Posts: 849
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Yoopersup Offline OP
Member
This is a Full HVAC unit was ordered wrong. MCA on name plate 74 amps single point hookup.
So need about 80 amps or so on three phase side.
As starteres ect are all ready in the package looking for 3 phase power imput. Vendor told us 40 hp unit well do the trick just checking.
Yoopersup


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