Fanuc OT 400 servo error

[alloy]

My lathe has been running well, last time I used it was 2 weeks ago. Yesterday is came up with a 400 servo alarm. Fuses seem good.

Not sure where to go from here?

 

[sdelivery]

With the power off , check to see if your slide is binding or stuck....

 

[alloy]

It seems to move freely.

I checked for voltage at the drive, it was 23.7v.

 

[mmcmdl]

Alloy . The Makino would sometimes blow a certain fuse while rapiding to a position close to the turret drill position . X "0" . It did this while boring in M3 CCW spindle rotation and CSS . It would over rev the spindle speed limit I would program and blow that one fuse . It was a large silver fuse filled with sand I believe and they were $75 a pop back then . This didn't happen often because 99% of the time I was boring in M4 . Could this be what happened ?

 

[alloy]

This was on startup. Ran great a couple of weeks ago. Checked the fuses I could find. Have 119v in to the drives, dc volts are 23.7

 

[alloy]

I finally got someone up here to look at my lathe. He found diagnostic errors on both x and z, so best guess is it's the servo drive. Pretty low probability that 2 servos motors went bad at the same time. So off to be repaired for $1300. They will check it and if nothing is wrong with they will send it back.

The exchange cost for one was $3100. There is a person on ebay that has them for $900, but I'm going with a company that the repair guys knows.

So maybe in 3 weeks I'll get the drive back.

 

[JimDawson]

You could always do what I did and rip out everything that says Fanuc on it and replace it with something more modern.

 

[alloy]

If I had your knowledge then that may be an option.

If I tried that I'd end up with a 10,000lb paperweight.

 

[pdentrem]

One of our Fanuc Wire EDMs decided to work once and awhile. Repair guy came in and was getting frustrated. BFH was moving up to sledgehammer size. Turns out a 1 amp fuse was making and breaking continuity randomly! When I tested the fuses before making the call, it was good but obviously it was not. What a ride!
Pierre

 

[sdelivery]

These drives are available used for about 400-600 depending on part number.
Virtually any thing Fanuc is available used for a fraction of the new price.
The same supplier has parts for many brands and models. Siemens, Mitsubishi, AB and a few I am forgetting.
Machine Parts International 216 251 4334