JF

Mastering Error

Kuka · KR C4 compact

What does JF mean?

This error indicates that at least one robot axis is not mastered, which subsequently deactivates the space monitoring function. The 'JF' signal's state '0' signifies an active mastering error, while '1' indicates no error. This condition poses a significant risk as it disables critical safety monitoring capabilities.

Repair Steps

  1. 1

    Review the mastering status of all robot axes using the controller's diagnostic interface to identify unmastered axes.

  2. 2

    Execute the official mastering procedure for any identified unmastered or improperly mastered axes as per the robot's operational manual.

  3. 3

    Confirm that the controller parameters related to space monitoring are re-enabled after successful mastering of all axes.

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Verified technical data. Last updated: March 2026