BRIDGE RATING FAULT

What does 921 mean?

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.

• 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.

Click steps to track your progress.

1. 1

   Ensure J14 on the Main Control PCB is seated properly.

2. 2

   Verify the presence and correctness of the Cube ID PCB.

3. 3

   Check that the correct PCU software is installed in U13 & U14 EPROMs.

4. 4

   Replace the Armature Interface PCB if faulty.

5. 5

   Replace the Drive Control PCB if faulty.