I have a 480V motor that I want to run off of a VFD but want to have the capability to start this motor across the line if something happens to the VFD. This motor is already operating from a FVNR starter in an MCC and I am going to install the VFD in an enclosure right next to the MCC.
My proposed arrangement is to leave the FVNR starter connected to the motor leads as the motor leads are currently temrinated on a terminal block in the starter. I was then thinking that I could put an ouput contactor on the output of the VFD and from this output contactor run feeder cables over to the same terminal block where the motor leads are tied into the starter. Therefore the leads from the starter and the VFD would be connected under the same terminals connecting also the the motor feeder going to the motor. (Assuming big enough terminal block.)
Aside from figuring out a control scheme and the possible safetly issue with backfeeding the VFD enclosure does this arrangement meet code? Are there any violations here? If so can you kinly cite?
My proposed arrangement is to leave the FVNR starter connected to the motor leads as the motor leads are currently temrinated on a terminal block in the starter. I was then thinking that I could put an ouput contactor on the output of the VFD and from this output contactor run feeder cables over to the same terminal block where the motor leads are tied into the starter. Therefore the leads from the starter and the VFD would be connected under the same terminals connecting also the the motor feeder going to the motor. (Assuming big enough terminal block.)
Aside from figuring out a control scheme and the possible safetly issue with backfeeding the VFD enclosure does this arrangement meet code? Are there any violations here? If so can you kinly cite?