Quote Originally Posted by tmcgree View Post
Hi all,
I recently purchased a XSY-AT1 VFD, and am having some problems -I was hoping you can help.
I saw a number of videos of guys using these on Youtube so figured it was worth a shot since my application is simple and the price was good.
I am driving a Baldor 2HP 3Ph motor with it and have a single phase input (220V) on the VFD. I have it all wired up as it should be, but as I turn the potentiometer, the motor starts to turn but with allot vibration, especially at low frequencies I can see and hear the motor bumping with every cycle. It seems as though the three phases are unbalanced somehow. I checked as best I could with a multi-meter on each wire to the motor and all three signals seem to be there, appear to be pretty identical. (with respect to each other and to ground).

As a test I took the motor and hooked it up to a Hitachi VFD I was already using for my lathe and it ran perfectly smoothly all the way down to 1 Hz. So the motor is fine.

At first I thought the problem might have to do with the default frequencies being 50HZ as my motor specifies 60Hz. So, I changed each frequency parameter on the VFD to 60Hz (also intermediate frequencies to 30Hz) but this did not help.
It seems pretty clear that there is something I am not understanding or perhaps I have a defective unit.

Any suggestions you have would be very welcome.


Tom McGreevy
Wish I could assist Tom. I had a similar problem and found the spindle wiring to be incorrect but you already know the correct wiring so its not that. the First port of call sounds like an investigation to determine if there a fault, but you know that already.