Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


B axis invert

B axis invert

B axis invert

We keep getting this alarm. I finally pulled the b axis motor and it seems very stiff to turn by hand. its a Fanuc A06B-0115-B103. Does anyone know if that is normal?


RE: B axis invert

I think so. What alarm number are you getting?

RE: B axis invert

B axis Invert: abnormal current
Z axis Excess

RE: B axis invert

I would think that it's more likely the lens assembly that's binding up.

If the alarm happens all the time, I would pull the motor and run it back and fourth in manual mode and see if it behave the same way.

If it's on the FO-NT, it could be debris in and around the lens assembly area that's binding things up.

Also, there is a red anodized aparture under the lens cartridge that can come loose and bind things up. Pull the cone off and make sure it's in all the way.

RE: B axis invert

Thank you for the reply. I installed a new motor and pulled the whole head apart and cleaned it and re assembled and its still giving it to us. Could the servo druver be an issue?

RE: B axis invert

When i had the motor out in manual mode it was giving me the warning again also then said abnormal current.

RE: B axis invert

There are a couple of possibilities, that model machine, there was a problem with the power wires that go in to the plug. Give the wires a tug and see if they pull out of the connector.

If that is okay, it's possible that the power wire that goes to the motor is broken somewhere.

I understand your concern about the servo amplifier. It is a possibility, but in 17 years, I have only replaced a couple of them, usually it's a problem with the encoder side of it.

RE: B axis invert

We ran new wiring a couple months ago and it all seems to be testing out good. we pulled the AMP 2 out and took it to a local shop for them to test for us so we are waiting on those results. i tugged on the wires and plugs and un hooked and re seated them and it still did it so now its a waiting game. yee haw

RE: B axis invert

I have had the B-axis lens slide assembly lock up on me twice. it took the biggest set of channel lock pliers I could find and a bench vice to remove the worm wheel. Make sure you are greasing the little worm screw that drives the wheel.

Did you say you unhooked the motor? Is it possible that your back up battery has gone bad and lost your b-axis ref. point? I had this happen as well on our FOM23015NT.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close