7953 A830

CC SRG rot. speed = 0 %.2s

Heidenhain · NC Control

What does 7953 A830 mean?

The maximum permissible velocity in SRG (Safe Reduced Speed) mode is detected as 0, which is incorrect. This can be due to an illegal operating mode selected by the keylock switch, a circuit error or disturbance at input I19 of the operator safety module, or an internal software error.

Common Causes

  • The maximum permissible velocity is 0 (as per parameter).
  • An illegal operating mode was selected by keylock switch.
  • There is a circuit error, or a disturbance at input I19 of the operator safety module.
  • Internal software error.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the position of the keylock switch to ensure a valid operating mode is selected, not one where SRG (Safe Reduced Speed) is configured for zero speed.

  2. 2

    Check the wiring and connections of input I19 on the operator safety module for any loose terminals, damage, or electrical disturbance.

  3. 3

    Review the specified parameters: MP540.x/MP541 (Operating mode BA3/BA4), MP552.x/MP551 (Special operating mode), and MP590.x/MP591 (Operating mode BA2) to confirm their values are correct and not inadvertently setting SRG to zero.

  4. 4

    Perform a system reboot of the NC control to clear any transient software errors.

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Verified technical data. Last updated: March 2026

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