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  1. Home
  2. Fault Codes
  3. Yaskawa SGDH
  4. A.F1
A.F1Alarm · Power sectionUsually repairable

Yaskawa SGDH A.F1: Power Line Open Phase

What A.F1 means

One phase of the main power supply is missing.

Symptoms

Alarm at power-on or under load.

Is it repairable?

Yes, when the SERVOPACK's input stage is the cause.

Common causes

  • Blown fuse
  • Loose terminal
  • Contactor contact worn
  • Failed input rectifier

Safe checks

  1. 1Measure all three phases at the SERVOPACK input
  2. 2Check fuses and contactor

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 Yaskawa SGDH SERVOPACK manual.

Related Yaskawa SGDH faults

  • A.10Overcurrent or Heat Sink Overheated
  • A.30Regeneration Error Detected
  • A.40Overvoltage
  • A.41Undervoltage
  • A.71Overload: High Load
  • A.81Encoder Backup Error
All 49 Yaskawa SGDH codes

Still showing A.F1?

SGDH SERVOPACK showing an alarm?

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Fault codes
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