We've had a rash of nasty problems on various Fanuc controls lately that defy repair. The alarm we see revolves around intermittent over-current alarms on various types of Fanuc red cap servos. Two of these have been on Fanuc OTB controls (Absolute Tecnologies and Weldmac), one on a Fanuc 18MA control (Roc-Aire) , and I believe one was on a 16 control.
In each case we started out replacing or swapping the VCU, then put in outside cabling, then changing out or removing the motors for testing, only to find out that it was the CNC all along feeding bogus commands to the VCU/Motor.
The one at Roc-Aire last week was just the latest one. In this case, the small two axis snap in board caused all of the above actions, and actually damaged the VCU eventually.
Be on the lookout for this type of scenario. They seem to begin as highly intermittent alarms that can be easily reset.
No one is happy after this is over.
Saturday, March 13, 2010
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