Quote Originally Posted by Richard View Post

I did read somewhere that VFD's don't like contactors etc inline with the motor, but I have also read that people just wire them up to the main input of the machine and they work ok. No bypassing of contactors, etc.
I think that that's pretty much the point at issue - the common lower-power VFDs don't like live switching - don't put any kind of switch/relay/contactor between VFD and motor - and some (the better ones? Read "cost more...") are OK. Have to check with supplier to find out which is which!