SV0449Servo alarm · Servo amplifier (SVM)Usually repairable
Fanuc αi SV0449: Inverter IPM Alarm
Also shown as: SVM display 8. / 9. / A.; 16i/18i/21i/0i: 449
What SV0449 means
The IPM (power module) in the servo amplifier (SVM) shut itself down for protection. Shown on the amplifier as 8., 9. or A. for the L, M or N axis.
Symptoms
Alarm on enable or during motion; often returns immediately after reset.
Is it repairable?
Yes: IPM replacement is one of our most common Fanuc amplifier repairs.
Common causes
- Short or ground fault in the motor or motor cable
- Failed IPM
- Coolant or oil contamination inside the amplifier
- Motor winding breakdown
Safe checks
- 1Megger the motor and power cable to ground with the cable disconnected from the amplifier
- 2Inspect the amplifier for contamination
Drives hold dangerous voltage after power-off. Checks should only be done by qualified personnel, with power isolated and the DC link discharged.
Reviewed by AutomIQ repair technicians. Code and name from the FANUC αi series Maintenance Manual.
Related Fanuc αi faults
- SV0368Serial data error (built-in)
- SV0401V ready off
- SV0433DC link undervoltage
- SV0436Soft thermal (OVC)
- SV0438motor current alarm
- SV0442DC link precharge failure