Schematic detail needed...

[John_B]

Does anyone have a schematic for A06B-6059-H003 AC Spindle Servo Unit, the spindle motor amp?

My previous regen resistor overheat problem was fixed but has returned exactly as before and I would really like to find the component that is failing to help troubleshoot and narrow the cause.

I can't get this info from the shop that repaired it previously unfortunately.

[John_B]

Nobody???

Any thoughts?

[fanucman]

are you getting a Discharge alarm?

[John_B]

No. 2003 "Resistor Unit Overheat" is the alarm, same as last time. The resistors are sinking current from the moment I start the machine - with the spindle running or not. The fans can keep them cool for about 15 minutes before it trips.

I sent it out for repair early this year, got it back and it worked until Monday.

[fanucman]

whats the 3 phase power looking like coming into the drive? should be 220 and balanced between all 3 phases..

[wizbangdoodle]

Could be the transistor/diode pack that controls when voltage is dumped across that resistor. Some repair shops don't check that thoroughly. They just run it a few minutes and call it good.

[John_B]

fanucman - I'm getting 238 on each, balanced real well though.

wizbang - Could be, the shop I sent it too won't comment - just that they repaired it. Pi**es me off too, I've been using these guys for almost 10 years - I think it's pretty obvious I'm not out to argue with them. I just don't want to fight this over and over and over.

[fanucman]

Originally Posted by John_B fanucman - I'm getting 238 on each, balanced real well though. wizbang - Could be, the shop I sent it too won't comment - just that they repaired it. Pi**es me off too, I've been using these guys for almost 10 years - I think it's pretty obvious I'm not out to argue with them. I just don't want to fight this over and over and over.

that is too high... you might want to lower that somehow...

[John_B]

I've got a buk/boost transformer in mind I'll pick up Monday and install that to see what effect it has.

[jdeere4250]

What alarm on the drive unit?? I have the details. But better to Diagnose accurately first then Plan of action.

[John_B]

Originally Posted by jdeere4250 What alarm on the drive unit?? I have the details. But better to Diagnose accurately first then Plan of action.

Sorry about the delay - wife had to go into hospital & I wasn't at the shop for a couple of days and then had to catch up when I did get back.

The drive unit doesn't show an alarm - just the operator control display. I bought a buck boost transformer as I mentioned and hope to get it hooked up in the next few days to see if the corrected power input helps the issue.

Rgds,
JohnB

[jdeere4250]

Again, I have the necessary info.
But I think it is not your fanuc sp. drive unit.
What Make and model of Machine, which make , model control?
And what/what axes does this machine tool have?
Generally there is no external resistor for fanuc sp. drive unit.
There are ext. resistor unit, for fanuc servo drive units.
I think this may be caused by axes units not Sp. drive unit.
I hope your wife is better.