Fanuc Power Mate i-D/H Maintenance Manual

7. TROUBLESHOOTING
B63175EN/03
436
This alarm is issued if the servo ready signal (VRDY) of a servo amplifier
does not turn on or if the signal turns off during operation.
There are cases in which this alarm is issued because another servo alarm
is issued. If this occurs, first take the action for the first alarm.
Check the power magnetic circuit around the amplifier. The servo
amplifier or the axis control cards on the Power Mate may be defective.
Power Mate Servo amplifier
MCON: From the CNC to the servo amplifier
(Turn MCC on to request the activation of the
servo motor)
VRDY: From the servo amplifier to
the CNC
(Notifies that the servo is ready)
The exchange of this information is performed via the FSSB (optical
cable).
7.13
ALARM 401
(V READY OFF)
Causes and actions
D VRDY

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