Fanuc alarm: 401 - SERVO ALARM: n-TH AXIS VRDY OFF

Machine Alarm Error & Message:
401 - SERVO ALARM: n-TH AXIS VRDY OFF

Fanuc's Alarm Description: The n-th axis (axis 1-8) servo amplifier READY signal (DRDY) went off. Refer to procedure for troubleshooting.

Additional Suggestions & Alarm Clarification:
None currently

Help Others:
Post troubleshooting recommendations for (Fanuc alarm: 401 - SERVO ALARM: n-TH AXIS VRDY OFF) error message below.

Fanuc CNC Control Models Applicable:
16/18/21, 16i/18i/21i, 160i/180i/210i, , 0i




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401 Servo Alarm VRDY OFF

On a Aplha Drive system with a PSM, pull off connector CX3 (MCC).
Turn ON power to the control and drives.
Take a ohm meter and measure across pins 1 & 3 of the CX3 connector on the PSM.
Open reading means the PSM is defective.
Shorted reading means the PSM is OK.

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