Transformers on the output are a bad idea but it's safe to run them on
the input. You just need to keep in mind that most inverters have a
pretty poor power factor so you need to up-rate your transformer to
suit. Two of my machines run 415V inverters on 240->415 single phase
step up transformers. It's not recommended to run 3 phase inverters from
single phase but you can get away with it as long as you don't try
pulling full power from the inverter. I never want to run my lathe at
it's full rated 10HP for instance so that isn't a problem.
Les
On 18/06/2021 02:45, Gregg Eshelman via Emc-users wrote:
Everything I've read on VFDs says do not feed them from a transformer. Nor can
you put a transformer between the VFD and the motor. Most of them say *nothing*
should be between the VFD and the motor, direct connection only. The one on my
1943 Monarch 12CK lathe recommends a noise filter on the input side to prevent
noise feeding back into the line from the VFD from getting to other stuff on
the circuit.
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