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902
POWER SUPPLY FAULT
Otis · DSD 412 Elevator System
Was bedeutet 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.
Häufige Ursachen
- 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.
Reparaturschritte & Checkliste
Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.
- 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.
Verifizierte technische Daten. Zuletzt aktualisiert: March 2026
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Quelle: Otis DSD 412 Elevator System