Ger, 4D and David,
I initially was turning the chuck to make sure my stock was centered in the jaws and at that time heard the dust collector momentarily turn on. I could hear a relay clicking in the controller as I turned the axis. I completely removed power from the system and when I turned the axis I saw LEDs on the back of the controller light up and the cooling fan spin. Obviously, the stepper motor is inducing a current in the controller causing odd behavior. Isn't electricity fun? I'll be careful not to turn it any more than I have to when it's off.