Fanuc 18it Control problem

[Wjman]

Help!
I have a problem with my machine, today (saturday) I was using the machine when all of a sudden it just stopped moving, after resetting the machine, power off etc. I keep on getting an alarm "401 servo alarm X axis VRDY off" and the same for Y V &Z.
Also I get a "407 Servo alarm - excess error" If anyone can help I would be most grateful.
Mark...

[M@T]

Sounds like you've had a bang on the machine and overloaded the servo's which drive the axis. If you smack the machine up and tool has nowhere to go the motor will still try and push it and eventually it'll cut out and usually throws out one of them servo alarms your getting.

Have a look at the Fanuc manual and go to the alarms section to see what it actually is and how to get rid of it. I've had this a few times and it sometimes can be solved by disconnecting the Z axis lead from the mainboard in the back of the machine then reconnecting it.

Good luck

[Wjman]

M@T,
Thanks for your prompt reply, I'll try what you suggested, and I'll keep you informed.
THX Mark...

[wms]

Wjman,

I don't have a Fanuc 18 manual, but if it is anything like their other manuals, it will have a "troubleshooting" chart that will lead your through it. This is the "Maintenance" manual not the operators manual.

Looking at the one for an O series, and it could be a simple as a blown fuse / tripped circuit breaker, poor cable connection to the servo driver card, a bad card, or trouble with the servo motor itself.

Hope it is a blown fuse or tripped circuit breaker.

[Wjman]

Thanks WMS,
I'll also try what you suggest.
Mark...

[Wjman]

Hi,
Sorry about the delay guys, wms & M@T, but while the machine has been down I got quite a backlog of jobs.
BTW I tried the things suggested by both of you, with no joy!
various error messages etc.
Anyway, to let you know, the problem was like this...
A few weeks ago unknown to me (I was on holiday), a similar problem occurred, and the boss had to call "Sweden" he talked to their "Tech guy there" and he suggested a few things, basically the 'Y' axis and the 'V' axis had became desynchronised,
which gives all sorts of errors. Anyway after a few hours on the phone 'trying various parameter mods' The problem appeared to be fixed.
When I came back to work, this problem occurred again (as you know), after talking to their "tech guy" again, he suggested various parameter mods, all to no avail. So after lengthy phone calls, and much investigation at their end, they decided to send an engineer down to us (He was already in the country, installing another machine).
To cut a long story short, the key at the end of the 'Y' leadscrew had fallen out,there was a washer acting as a lock, but the retaining screw had fallen out (ooops! they forgot the loctite)
Anyway this appeared to be our problem.
Mark...

[Klox]

Glad to hear you're up & running again!

Klox