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.
Common Causes
- Supply voltage dropped below the minimum threshold (e.g., P1-01).
- Power supply unit failure.
- Loose electrical connection on the power input terminals.
- Overload condition drawing excessive current, causing voltage sag.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Rectify the undervoltage fault condition.
- 2
Reset the fault by pressing the hardware acknowledgement button 'ACK' on the DSE I module.
Verified technical data. Last updated: March 2026
Related Faults
Source: Kuka KRC2 KSS System Message