I'm chasing a problem with my system where it intermittently resets Mach 3 during operation. In checking wiring and ground voltages, I found a .25 voltage difference between ground on my Controller and ground on the spindle sheild wiring. The spindle shield wiring is connected directly to the rest of the grounds, and so is the controller. When I measure voltage to the main ground common connection point, either component will measure zero. But when I measure from the spindle shield to the controller chasis ground I get a .25 volts.

Is this enough difference to worry about? How can I get rid of this?

Thanks. I hope my explanation is adequate.

Wayne C