Fanuc Servo Amplifier Alarm 421 - SERVO ALARM: n AXIS EXCESS ER (D)
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.
Nationwide FANUC Servo Alarm 421 Troubleshooting, Repairs & Replacement Service
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