Another vote for the Drives Direct plug and play inverter. Well over 10 years on my 7 hp unit powering my whole workshop. 10 machines altogether running either singly or two at a time where the second one is usually either the shaper or hydrovane compressor. Handles the 2 speed motor on my wartime P&W Model B with its spleditly stamped punk oil immersed contactor controls, just fine.
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I bought the smoothing unit primarily due to worries about radiated electromagnetic interference. I'm not sure if I really believe the tales of worrying amounts of electromagnetic radiation escaping if you have long wires between VFD box and machine but the smoothing inductors will certainly cut all the nasty high frequencies. Loosing the sharp edges, high dv/dt, is probably not a bad thing when it comes to old motor internal insulation which really wasn't designed for that sort of thing. Also wanted to be ready if I ever decided to go CNC
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Clive
