Problem- 414, 424 servo alarm

[hotrob1]

We have a Citizen with a Fanuc A06B-6058-H221 dual amplifier. We are getting the 414, 424 detect alarms. We had the amp and P/S repaired. It powered up ok and X jogged/homed. However, Z took moved in the wrong direction and in rapid. We reversed 2 leads on the output. It moved in the right direction. We cycled power and it came up ok. We attempted to move X again and it took off in a rapid move and overtraveled and the 401, 414, and 424 came back up.

We have checked cabling, installed 1 new pulse coder, had the amp and power supply repaired, checked hookups, etc. The pulse coders connect through the motherboard/cpu and then out to the amp.

Any thoughts?

Thank you.

[hotrob1]

In diagnostic 720 - 00010000
In diagnostic 721 - 00010000

If I'm not mistaken, I believe the bit stands for OL. Is that correct?

Also, get a 521 OT-Z on occassion. This of course is overtravel in Z-axis.

Thanks. Any thoughts???

[tmbruno28]

what control please ?

[hotrob1]

I was told it is 0-t.

Thanks.

[hotrob1]

I got the X-axis to jog and home. Now the Z-axis gets a 420 alarm and an occassional 424 detect alarm. This is on a dual axis servo amp. (Fanuc) No replies yet.....hello? Where's the normal experts that usually pipe in???

Thanks.

[hotrob1]

The Fanuc controller is a O-B. We have the X-aixs jogging and homing. If we attempt to move the Z-axis we get a 420 Z-excess alarm. This is on the dual servo amp.

Any thoughts on what would be causing the 420 alarm?

Regards.