Replaced MCB- PB
Allen-Bradley · PowerFlex 750
What does 107 mean?
This fault occurs when the main control board has been moved to a different power structure, causing all stored data to reset to default values. It signifies that the drive requires a complete re-commissioning. Failure to re-enter application-specific parameters will result in incorrect or no drive operation.
Common Causes
- Main control board (MCB) physically moved from one power board to a different power board, triggering a hardware change detection.
- Power board itself was replaced with a new one while retaining the existing main control board.
- Internal drive logic incorrectly detected a change in the power structure ID due to a transient event.
- Corrupted power board identification data causing the MCB to perceive a "new" power board.
- Incorrect drive assembly or service procedure where boards were swapped without following recommissioning steps.
Repair Steps & Checklist
Click steps to track your progress.
- 1
1. Acknowledge the fault, noting that drive parameters have reverted to factory default values.
- 2
2. Upload the most recent parameter backup file from a PC or HMI memory module (e.g., using DriveTools SP or a HIM).
- 3
3. If no backup exists, manually re-enter all motor, application, and I/O parameters based on commissioning documentation or previous settings.
- 4
4. Perform a controlled test run (e.g., jog mode, auto tune) to verify the drive operates correctly with the re-entered parameters.
- 5
5. If this fault appears without a physical MCB/PB change, check for stable control power (e.g., 24VDC) and potential power board internal identification circuit failure.