Use your Volt meter to see if 220VAC is arriving at your machine and then at the VFD. R(L1) and S(L2). If not then you have a power problem out side the Mill. Wouldn't you be lucky. The VFD manual shows a fuse/breaker in line with power as recommended(?) or supplied (dashed lines around it). Again page 2-2 of the VFD manual.