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902

POWER SUPPLY FAULT

Otis · DSD 412 Elevator System

¿Qué significa 902 ?

The Low Voltage Power Supply (A4) output has dropped below 60% of the rated voltage. This fault requires a CPU Reset and will shut down the drive.

Causas comunes

  • Loss of 115VAC power.
  • Short circuits in +5V, +/-15V, or +24V circuits, possibly external to the drive.
  • Failed Power Supply A4.
  • Blown fuse internal to the power supply.

Pasos de reparación & Lista de verificación

Haga clic en los pasos para seguir su progreso.

  1. 1

    Verify the 115VAC power supply.

  2. 2

    Check +5V, +/-15V, or +24V circuits for short circuits, both internal and external to the drive.

  3. 3

    Inspect the A4 Power Supply for failure.

  4. 4

    Check for blown fuses internal to the power supply.

Ver todos los códigos en este manual (57)
Datos técnicos verificados. Última actualización: March 2026

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