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ErrorLib — Industrial Fault Code Library

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106

Incompat MCB- PB

Allen-Bradley · PowerFlex 750

What does 106 mean?

The main control board (MCB) did not recognize the power structure (PB), indicating a firmware or hardware incompatibility, or a communication issue between the two boards. This prevents proper drive initialization and operation. The drive will not be able to function until the firmware revisions are harmonized.

Common Causes

  • Firmware version mismatch between the main control board (MCB) and the power board (PB).
  • Improper seating or connection of the main control board to the power board backplane connector.
  • Damage to the backplane communication pins or connectors between the MCB and PB.
  • Installation of an incompatible main control board model or series with the existing power board.
  • Internal power board communication circuit failure or defective identification module.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Verify that the main control board (MCB) is correctly seated and fully engaged into its slot on the power board backplane.

  2. 2

    2. Carefully inspect for any visible damage, bent pins, or debris on the backplane connector between the MCB and PB.

  3. 3

    3. Compare the firmware versions of both the MCB and PB using programming software (e.g., DriveTools SP); update to compatible versions if necessary.

  4. 4

    4. Confirm the compatibility of the installed MCB with the specific power board model number and revision using product documentation.

  5. 5

    5. If physical connection and compatibility are confirmed, consider replacing the main control board (MCB); if the fault persists, replace the power board (PB).

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

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Source: Allen-Bradley PowerFlex 750
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