Buffer battery voltage low

Buffer Battery Undervoltage (U<22V)

Kuka · KR C2 Robot Controller

What does Buffer battery voltage low mean?

The buffer battery voltage has dropped below 22V, indicating an undervoltage condition. This requires attention to maintain system integrity and prevent data loss.

Common Causes

  • Buffer battery voltage dropped below P0-50 threshold (e.g., <22V).
  • External power supply failure affecting buffer battery charging.
  • Internal battery protection mechanism triggered due to low voltage.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Charge the battery.

  2. 2

    Manually save the mastering data via KUKA HMI (`Setup > Master > Save current data`) before any battery exchange or power cycle.

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Verified technical data. Last updated: March 2026

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