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ErrorLib — Industrial Fault Code Library

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7951 A810

CC limit switch %.1s-

Heidenhain · NC Control

What does 7951 A810 mean?

The permissible negative traverse range for the specified axis was exceeded. This indicates the axis has moved beyond its programmed negative software limit or a physical negative limit switch has been activated.

Common Causes

  • Permissible negative traverse range exceeded.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the physical negative limit switch for the affected axis for any damage, obstruction, or incorrect adjustment.

  2. 2

    Verify the setting of parameter MP670 (Negative software limit switch) for the specified axis to ensure it is configured correctly according to the machine's travel limits.

  3. 3

    Inspect the axis position feedback system (encoder) for accuracy and potential errors that could lead to an overshoot.

  4. 4

    Manually jog the axis cautiously in the positive direction to move it off the limit switch, then verify it moves freely without mechanical binding before reaching the negative limit again.

Browse all codes in this manual (58)
Verified technical data. Last updated: April 2026

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Source: Heidenhain NC Control
Open Manual (Page 302)Search more codes in this manual