Fanuc alarm: 421 – SERVO ALARM: n AXIS EXCESS ER (D)

CNC Machine Alarm Error & Message: 421 – SERVO ALARM: n AXIS EXCESS ER (D)
Fanuc Alarm Description:
The difference between the errors in the semi-closed loop and closed loop has become excessive during dual position feedback. Check the values of the dual position conversion coefficients in parameters No. 2078 and 2079.

Additional Suggestions & Fanuc alarm: 421 – SERVO ALARM: n AXIS EXCESS ER (D) Clarification:
None currently

Troubleshooting Recommendations for (Fanuc alarm: 421 – SERVO ALARM: n AXIS EXCESS ER (D)) Error Message:
Post troubleshooting recommendations for (Fanuc alarm: 421 – SERVO ALARM: n AXIS EXCESS ER (D) ) error message below.

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


Fanuc alarm: 421 – SERVO ALARM: n AXIS EXCESS ER (D)