2878 A100

Standstill monitoring %.2s

Heidenhain · NC Control

What does 2878 A100 mean?

The rotational speed limit for Safe Controlled Stop (SBH) was exceeded. This occurred while the protective door was open and the key switch was turned to 'automatic,' indicating a safety violation.

Common Causes

  • Rotational speed limit SBH was exceeded.
  • Protective door was open.
  • Key switch was in 'automatic' mode.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure all protective doors are fully closed and their interlock switches are correctly engaged before operating in 'automatic' mode or at any speed.

  2. 2

    Verify the function and wiring of the safety key switch, ensuring it correctly registers its position and transitions between operating modes.

  3. 3

    Check the SBH (Safe Controlled Stop) speed monitoring parameters to ensure they are configured correctly for the machine's safety requirements.

  4. 4

    Inspect the axis encoder feedback system for accurate speed measurement, as erroneous feedback could falsely trigger this fault.

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Verified technical data. Last updated: March 2026

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