On 12/22/2015 10:25 AM, William Donzelli wrote:
Another thought - with scrap transformer prices in a crapper right
now. you might also be able to pick up a really beefy isolation
transformer for spare change, in order to clean up a VFD. Generally,
normal industrial grade 50 Hz transformers will not care too much if
you use them at 60 Hz.

An isolation transformer will NOT "clean up" a VFD's output. The output of a VFD is NOT some dirty sine wave, it is a train of 400 V PWM pulses with perhaps a 15 KHz carrier frequency. It could be filtered, but would take a filter built out of a bunch of HUGE inductors and capacitors. It might actually be a decent solution for keeping museum-quality gear running in an unaltered state, but it isn't something you could whip up in a couple hours in your garage.

Jon

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