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ErrorLib — Industrial Fault Code Library

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A00542

Speed Control Optimisation Active

Siemens · SINAMICS G120

What does A00542 mean?

This alarm indicates that the speed control optimization process (parameter P1960) is active or has been selected to run. This is a normal state when the drive is fine-tuning its speed control parameters to achieve optimal performance and responsiveness.

Common Causes

  • Speed controller optimization (e.g., P1960) has been manually activated from the HMI or engineering software.
  • The drive is configured to run automatic speed control optimization after specific parameter changes or a reset.
  • Changes to mechanical load conditions, motor parameters (e.g., P0304), or control loop settings (e.g., P1460, P1470) have necessitated re-optimization.
  • Internal tuning routines are being performed to improve dynamic response and speed accuracy.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Allow the speed control optimization process (P1960) to complete its cycle; this is a normal tuning operation.

  2. 2

    2. Ensure no external mechanical disturbances or abrupt load changes are occurring during the optimization process.

  3. 3

    3. Monitor the optimization progress via relevant status parameters (e.g., r0002, r1961) on the HMI or engineering tool.

  4. 4

    4. If the optimization fails or is stuck, cancel it (e.g., P1960=0) and manually adjust relevant speed controller parameters (e.g., P1460, P1462, P1470, P1472).

  5. 5

    5. Verify the motor's actual speed feedback (e.g., r0021) is stable and accurate during the optimization attempt.

Browse all codes in this manual (109)
Verified technical data. Last updated: April 2026

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Source: Siemens SINAMICS G120
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