I have installed several VFDs with the line & load conductors in the same raceway, and they worked fine for years.
I did however have a problem with voltages induced in a VFD with a 5 volt control circuit that shared a raceway with the load conductors. The VFD load conductors were inducing about 8 volts in the control wires and if I let go of the stop button during the ramp-to-stop period, the motor started up again.
For various reasons, we couldn't run a separate contol conduit, so we actually bought a new drive with a 10 volt control circuit and the problem went away.
That all being said, I would call your suppliers VFD man. He should be able to advise you.
Are they Allen Bradley?
Last edited by Redsy; 02/08/08 09:56 PM.