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903

LINE SYNC FAILURE

Otis · DSD 412 Elevator System

¿Qué significa 903 ?

The Phase Locked Loop has lost synchronization with the 3 Phase AC input power supply. This sets the Severe Fault flag and forces the current reference to zero, shutting down the drive. It is generally caused by AC input power problems and is often self-correcting, frequently occurring with an F904 fault.

Causas comunes

  • AC input power problems.

Pasos de reparación & Lista de verificación

Haga clic en los pasos para seguir su progreso.

  1. 1

    Inspect the 3-phase AC input power supply for stability and proper voltage.

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Datos técnicos verificados. Última actualización: March 2026

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