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  1. Home
  2. Fault Codes
  3. Fanuc αi
  4. SV0442
SV0442Servo alarm · Power supply (PSM)Usually repairable

Fanuc αi SV0442: Converter DC Link Precharge Failure

Also shown as: PSM display 5; 16i/18i/21i/0i: 442

What SV0442 means

The power supply (PSM) could not charge the DC link at power-on. Shown on the PSM as 5.

Symptoms

The machine will not reach ready after switch-on.

Is it repairable?

Yes: precharge and DC link faults are repairable.

Common causes

  • Short on the DC link from a failed servo or spindle amplifier
  • Failed PSM precharge circuit
  • Failed DC link capacitor

Safe checks

  1. 1With power off, disconnect the DC link busbars from each amplifier in turn to find a short

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
  • SV0443cooling fan stopped
All 139 Fanuc αi codes

Still showing SV0442?

Fanuc amplifier showing an alarm?

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Related services: Power supply (PSM) repair · Servo amplifier repair

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