123

Under voltage

Kuka · KRC2 KSS System Message

What does 123 mean?

The internal servo output stage is not ready due to an undervoltage condition. This will cause maximum braking and inhibit all active commands.

Repair Steps

  1. 1

    Rectify the undervoltage fault condition.

  2. 2

    Reset the fault by pressing the hardware acknowledgement button 'ACK' on the DSE I module.

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Verified technical data. Last updated: March 2026
Source: Kuka KRC2 KSS System Message
Kuka Error 123: Under voltage — Troubleshooting Guide | ErrorLib