Fanuc Power Mate i-D/H Maintenance Manual

7. TROUBLESHOOTING
B63175EN/03
438
This alarm is issued if the servo ready signal (VRDY) of a servo amplifier
remains on.
The servo amplifier or the axis control cards on the Power Mate may be
defective.
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)
Power Mate
The exchange of this information is performed via the FSSB (optical
cable).
This alarm is issued if VRDY remains on when the Power Mate turns
MCON off or if VRDY turns on before the Power Mate turns MCON on.
The servo amplifier may be defective. Replace the servo amplifier.
If replacing the servo amplifier does not solve the problem, replace the
axis control cards. (See Subsec. 2.3.2.)
7.14
ALARM 404
(V READY ON)
Causes and actions
D VRDY
D Replacing the servo
amplifier
D Replacing the axis
control cards

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