SV0443Servo alarm · Power supply (PSM)Usually repairable
Fanuc αi SV0443: Converter Cooling Fan Stopped
Also shown as: PSM display 2; 16i/18i/21i/0i: 443
What SV0443 means
The cooling fan in the power supply (PSM) stopped. Shown on the PSM as 2.
Symptoms
Alarm at power-on or after running; the fan is silent or slow.
Is it repairable?
Yes: fan replacement is a quick repair.
Common causes
- Failed fan motor
- Fan clogged with oil mist or dust
- Fan connector fault
Safe checks
- 1Check whether the fan spins and is clean
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