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921
BRIDGE RATING FAULT
Otis · DSD 412 Elevator System
Was bedeutet 921 ?
The drive's computer cannot identify the drive size. The bridge type is determined by a sense resistor on the Cube ID PCB (plugged into the A2 Armature Interface PCB), which identifies the ampere rating and current feedback scaling of the physical hardware. This fault occurs if the sense resistor value is not recognized. This fault requires a DSD power down.
Häufige Ursachen
- J14 on Main Control PCB is not seated properly.
- Missing or wrong Cube ID PCB.
- Wrong PCU software in U13 & U14 EPROMs.
- Faulty Armature Interface PCB.
- Faulty Drive Control PCB.
Reparaturschritte & Checkliste
Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.
- 1
Ensure J14 on the Main Control PCB is seated properly.
- 2
Verify the presence and correctness of the Cube ID PCB.
- 3
Check that the correct PCU software is installed in U13 & U14 EPROMs.
- 4
Replace the Armature Interface PCB if faulty.
- 5
Replace the Drive Control PCB if faulty.
Verifizierte technische Daten. Zuletzt aktualisiert: March 2026
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Quelle: Otis DSD 412 Elevator System