10-21-2013, 04:51 PM
(10-21-2013, 02:41 PM)stevec Wrote: ...
I'm just worried about unplugging one machine while the VFD is still powered and then plugging in the other machine.
I'm not disciplined enough to guarantee unplugging the input to the VFD before outputs are unplugged.
Am I paranoid about turning off the VFD before disconnecting (plug or switch) to the motor it was driving?
I would not do it Steve. You'd have to change the parameters to match the motor when you switch it from one machine to the other. Or you'd have to find a happy medium between the two, if that's even possible.
You'd also be better off looking for one with sensorless vector tuning as it give better torque at the lower RPMs. The one you linked to uses PWM. Here's a Hitachi 5HP sensorless vector VFD that's only a little more than the one you linked to.
http://www.driveswarehouse.com/p-2534-wj200-037lf.aspx
Ed