First off thanks in advance for any response to this problem. I think I know the answer but wanted to run this through what really is the best forum on this machine on the net.
This is an Arrow 1250C with the scale option. The problem started about 2 years ago when the X axis would fault when driven rapid. Now I can not remember if it was Foldback or P (over current). Sent drive and motor out and had them tested and came back "good" but was still giving us problems.
In any case we configured it to run at 50% and limped along for a while until last week when the Y and Z would creep when they were powered up. X did not move but faulted with a P on the drive after about 10 seconds.
I've tested the power and encoder cables for continuity and insulation problems and they all appear good. X screw is free and moves easily. Motor ohms out at 3.6-3.7 ohms between poles. Supply voltage is good (315V at idle).
Removed the motor power cable at drive; no fault
Motor power cable connected to drive an disconnected from motor: no fault
Power cable on motor and drive; faults with "P".
This is where it sits now but I seem to remember during this cluster seeing the Z drive with the over current P fault on the drive display but that may be my memory playing tricks.
Drive is the Vickers AS10300 and has been gone through in 2009. Motor is the Vickers FAS MT504A9-F9A3-071 and was rebuilt also in 2009.
Anything I am missing?
Problem appears to be external (motor) but I have no real confidence in this diagnosis.
Switching the X drive to Y axis motor is my next step but if I remember correctly I've been led down the wrong path before trying this trick.
What should I see on the power leads to the X motor at idle with an inductive clamp ammeter? What voltage?
Thanks again.