Quote Originally Posted by Doddy View Post
You are correct - as far as providing a completely safe solution you would require to disconnect the supply. The manual does indicate an electromagnetic contactor (relay) but notes that this should not be used as a general on/off control.
I ordered a relay the other day intending to use it for exactly that function, then I read this in the manual. I'm sure I'll find another use for that relay, so the £5 I've spent on it is immaterial, but whats the reasoning for this exactly? Is it the noise that the VFD is spewing out, or is it more of a surge current thing?