F3123

Safety related holding system: brake check missing

Bosch Rexroth · IndraDrive MPx02

What does F3123 mean?

This non-fatal safety error indicates that a required brake check for the safety-related holding system has not been performed or successfully completed on the IndraDrive MPx02. Without a successful brake check, the reliability of the holding brake for safety functions cannot be guaranteed.

Common Causes

  • Brake check command was not issued or received by the IndraDrive MPx02.
  • Application conditions preventing the execution of the brake check (e.g., axis not at standstill).
  • Faulty brake or brake monitoring, causing the check to fail.
  • Incorrect configuration of the brake check function parameters (e.g., P-0-0536 for time interval).
  • Communication issues between the safety controller and the IndraDrive MPx02 regarding brake check initiation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Manually initiate a brake check via the HMI or control system to determine if it completes successfully.

  2. 2

    Review the machine sequence to ensure that the conditions for a brake check (e.g., axis at standstill, no active motion command) are met at the appropriate time.

  3. 3

    Verify all wiring and control signals for the motor holding brake and its feedback devices.

  4. 4

    Check brake check parameters in the IndraDrive MPx02, ensuring settings like time intervals and thresholds are correctly configured.

  5. 5

    Confirm communication integrity between the safety controller and the IndraDrive MPx02 if the brake check is externally triggered.

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Verified technical data. Last updated: March 2026

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Source: Bosch Rexroth IndraDrive MPx02