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- Oct 11, 2016
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At somewhere around 6HP, depending on your source, begins the transition where rotary phase converters begin to make sense. If you are bujying 2 VFD untis to power the machine, then a RPC is clearly a way to go - but -you lose the ability to control the speed directly or do overspeed. It easy hobby way is to VFD the main motor, ans use it wothout the power feed for a while, gaining the advantages of a VFD. THEN you can add a second VFD when you cna afford it, allowing the power feed.
A word of caution: It can be tricky to run two motors on one VFD. I would shy away from running your 6HP motor on anything less than a 6HP VFD. The impedance and the inductance are our of spec for the VFD, and can affect its operation. I'm not saying it can't be done, but it can be expensive if you damage your VFD.
A word of caution: It can be tricky to run two motors on one VFD. I would shy away from running your 6HP motor on anything less than a 6HP VFD. The impedance and the inductance are our of spec for the VFD, and can affect its operation. I'm not saying it can't be done, but it can be expensive if you damage your VFD.