Reply by TopamaxSurvivor

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Posted on Baileigh JP-1686 Three Phase Electrical Question

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23271 posts in 5009 days

#1 posted 10-20-2021 07:16 PM

My best guess without all the loads and the distance to the main panel is 60 amp and #6 copper or #4 aluminum minimum. The total load and voltage drop needs to be taken into consideration. My best guess at full load amps on the rotary phase converter is about 32 amps x 1.25 = 40 amps.

- TopamaxSurvivor

Thanks – Would i be better off purchasing a VFD since it essentially provides a soft start? would i then be able to get by with say a 40 amp breaker?

- BoilerUp21

Yes, the VFD with a soft start would have a lower circuit requirement. The circuit and feeder size depends on other loads and the nameplate data on the motor and the VFD manufacturer’s info.

As CAptK said all the controls and safety switches on the machine need to be connected to the VFD. The VFD needs to be connected directly to the motor. If the magnetic starter remains in the circuitry when it stops the motor it will destroy the VFD.

You probably need to find an electrician experienced in motor controls to make the modifications. Unfortunately, most will not have experience in the area. It may be less expensive to just feed the existing system with 60 amp feeder depending on total load, distance, ect.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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