Fanuc problems.

[Sam]

Thought I might be able to get some advise on troubleshooting a machining center thats just been sitting idle in the shop for 4 years. I have seen it run previously, and if memory serves correct, the travel limit was possibly exceeded, and the error began at that time. The error that is displayed states "Y pulsecoder disconnect". Nothing has been physically disconnected. What would give this error other than disconnecting the cable? I have not taken anything apart on the motor yet to inspect it. If the machine had hard-stopped, would a power surge cause something to go bad, and result in this error? Maybe the limit switches were not functioning, I don't know, nor do I know that the limits were in fact exceeded. The magnascale also indicates a problem with an error LED, but on the X axis. Any advise on troubleshooting this is greatly appreciated.

[Graham Waterworth]

Are the motors red or yellow caps, what is the control, 6,11, 18M ?

Graham.

[Sam]

Motors are yellow caps, 11M control.