111

PwrBd Invalid ID

Allen-Bradley · PowerFlex 750

What does 111 mean?

The power structure ID is invalid, meaning the main control board cannot correctly identify the connected power structure. This suggests a communication issue or a fundamental mismatch between the boards. The drive cannot start or operate safely without proper identification of its power components, leading to a shutdown.

Common Causes

  • The main control board (MCB) cannot read or incorrectly reads the power board's unique identification code.
  • Physical damage to the power board's ID chip or related circuitry on the power board.
  • Corrupted power board ID data stored in its non-volatile memory due to power disturbance.
  • Intermittent or poor connection between the main control board and the power board backplane.
  • Installation of a power board from a different product family or incompatible series.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Perform a drive power cycle by disconnecting input power (e.g., 480VAC) for 30 seconds.

  2. 2

    2. Ensure the main control board (MCB) is fully and correctly seated into its slot on the power board backplane.

  3. 3

    3. Visually inspect the backplane connector between the MCB and PB for bent, damaged, or corroded pins.

  4. 4

    4. Verify the power board part number and series against compatibility charts for the installed MCB using product documentation.

  5. 5

    5. If the issue persists after these checks, replace the power board as its identification circuit or data may be faulty.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley PowerFlex 750