So I settled on A VFD (Hitachi) and now I have some questions. I am going from 220 single phase to 220 3 phase. My plan was to go from 30A circuit breaker through 10G wire to 20A fuses (sized per the manual) to the VFD to the motor. The manual says that I should install a ELB, and a magnetic connector. Between the power source and the input. What is the purpose of these and are the necessary. Also my understanding is that the power goes to L1 & L3 (why is this labeled N in the manual) there is no neutral, and the VFD is grounded is this correct? is it ok to use the neutral wire as a separate ground between VFD, motor, and Panel ground? Finally there are two auxiliary cooling fans on my mill blowing at the head is there a way to run these through the VFD also (I assume they are 3 phase as they are wired in to the motor) or should I just buy some replacement 120V fans and run them on a separate circuit? They are small square muffin style fans.
Thanks for the advice.
Just to clarify a bit, the device they are referring to is a magnetic contactor (motor relay). Not sure what they mean by an ELB, could be a line filter. Sometime helpful if you experience electrical noise on control wiring, electrical noise can fowl things up a bit in sensitive control circuits. Not likely in this case. The contactor provides a remotely controllable disconnect for the VFD, not required in this case.
I have my VFD's properly fused, but wired directly to the breaker, eg Breaker >>> Fuse >>> VFD. I leave them on all the time.
Just a side note, never put a disconnect between the VFD and the motor (unless absolutely required by code as a local service disconnect)
It could be that L1 - L3/Neutral, is for marked for European wiring where 220 V has a neutral.
Ground the VFD, the panel GND, and the motor ground to the ground lug on the VFD.
Do not use your neutral as a ground. Pull in a dedicated ground wire. If you are using the neutral in your panel for control wiring, you will need to bring in 4 wires. Normal residential wire colors would be Black, Red for the hot wires, White for the neutral, and Green for the ground.
Check the voltage on the muffin fans, they could be 240V, I have never seen a 3 phase muffin fan. My guess they have separate wiring to them.
Hope this helps.