I have a Journeyman 325 with Dynapath Delta 20 control that I bought a few years ago. It was functional up until mid-December last year; good one day, the following day could not get the drives to start up using the Reset button on control. I am running power from a 10HP RPC that came with the machine from previous owner, where the outputs are about 240V for the two pass-through legs, and about 265V for the generated leg. This machine has the input power separated between control and servo cabinet, so that the control cabinet uses the two 240V pass-throughs and the servo cabinet sees all three legs, entering through the 3-phase input circuit breaker on the machine. It appears that the 3-phase breaker is tripping immediately at startup of the machine, which would seem to be the reason the servos won't start from the Reset function.

The circuit beaker is a shunt-trip unit, with a couple of wires running 24V from "somewhere" to the shunt coil. My main questions are these:
-- What is the normal state of the shunt-trip coil when in operation, energized or non-energized? My assumption is that it should not be energized, but that is just that - an assumption.
-- What is the immediate upstream source for the 24V that feeds the shunt-trip coil? My documentation for this machine is not as complete as I would like.

The power being supplied appears to be over the tolerance for the machine specs, at least for the generated leg, and I need to address that. It may be the cause for the problem, but I would like to eliminate as many ancillary components as possible from the list. Replacing the circuit breaker is about a $600 exercise, from what I've gotten from electrical distributors, so not an easy experiment. Any help appreciated --