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ErrorLib — Industrial Fault Code Library

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107

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

    1. Acknowledge the fault, noting that drive parameters have reverted to factory default values.

  2. 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

    3. If no backup exists, manually re-enter all motor, application, and I/O parameters based on commissioning documentation or previous settings.

  4. 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

    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.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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