Need Help!- VM16 with CSM 11405-706

[Radius]

Hi everyone.

I cross posted this to the servo motors and drives forum.

I think I have my VM-16 homing problems solved other than my Z axis.

My machine has a Custom Servo Motors MPM-11405-706 Z axis motor with brake.

This motor is definitely not happy. I believe the motor has some type of internal fault. I also believe it has a bad bearing at the pulley end. The main problem I'm having is that it overloads the servo drive. Just the load of holding the Z up with the brake off is overloading the drive. I've tried swapping drives, etc. The problem stays with the Z motor.

This motor was, unfortunately, exposed to some moisture. Is it possible the thing just needs to be baked for a while? Has anyone disassembled one of these things? How hard are they to repair? Is this something that I probably shouldn't try on my own? If not, anyone know of a good, reasonably priced and honest repair outfit?

To add misery to my situation, CSM was a division of MTS Automation who got swallowed up by Parker Hannifin. Those guys basically told me that any motors made before the acquistion were obsolete, not repairable, no info... In other words.. I'm screwed..

Milltronics has been great at providing support, I just can't afford to replace this motor at a cost of many thousands of $.

Thanks,
Michael

[kokai]

What about the servo drive? Is it fine? I want know whether was the motor brake only? I had barge up against this problem, it was the drive fault.

[Radius]

Originally Posted by kokai What about the servo drive? Is it fine? I want know whether was the motor brake only? I had barge up against this problem, it was the drive fault.

I'm sure it's not the servo drive. I have a few spare boards and I get the same fault with all of those. Conversely, the boards that are faulting work fine in the X and Y axis.

The motor does have a brake, and if voltage is applied to the brake I can spin the motor freely by hand. It does have a bad bearing but I'm pretty sure there is more to the problem.

I'm pretty sure I am going to have to send this motor out for repair. Unfortunately all of the approximate quotes I have been getting have been from $500-$1000 to repair it. Unless I somehow got lucky and came across one on ebay it looks like that's what I'm going to have to do.


Thanks,
Michael

[kokai]

sir:

As you described I don't think really was the motor fault.

was the alarmed letter "Over load"?

If it is this letter , may have three side problem as i to analyze below:

1. driver fault

2. motor fault

3.the brake on the motor was not switched 24V on.

I frankly to suggest you be sure the third item. Is it alright?
You could inspect the wire in the apparatus cabinet!
Of course need cross reference circuit diagram.

[Radius]

Originally Posted by kokai sir: As you described I don't think really was the motor fault. was the alarmed letter "Over load"? If it is this letter , may have three side problem as i to analyze below: 1. driver fault 2. motor fault 3.the brake on the motor was not switched 24V on. I frankly to suggest you be sure the third item. Is it alright? You could inspect the wire in the apparatus cabinet! Of course need cross reference circuit diagram.

You can rule out #3 since I tested the motor on the machine. The brake *is* getting 24VDC and *is* releasing. That's why I am able to rotate the motor.

I do not think #1 applies since I do not think there is a drive fault. The LED that illuminates on the drive is RMS/TEMP. That LED only lights when there is an overload condition. I tried 4 different servo drive cards for the Z and they *all* exhibit the same symptoms. When those same cards are used to X or Y they work fine. In my mind that would rule out the servo cards.

Since all of the wiring between the servo and the control cabinet buzzes out ok and there are no shorts to other wires or to ground, about the only thing left is the servo motor. Correct?

Thanks,
Michael

[kokai]

The truth verified : you are right!