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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
Verify the 115VAC power supply.
- 2
Check +5V, +/-15V, or +24V circuits for short circuits, both internal and external to the drive.
- 3
Inspect the A4 Power Supply for failure.
- 4
Check for blown fuses internal to the power supply.
Datos técnicos verificados. Última actualización: March 2026
Fallas relacionadas
Fuente: Otis DSD 412 Elevator System