815-578-9145Fanuc Servo Amplifier Alarm 421 - SERVO ALARM: n AXIS EXCESS ER (D)
FANUC Alarm Codes >> FANUC Servo Amplifier Alarms >> Servo Amplifier Alarm 421
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.
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