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Ballast switch energized for too long PMx during charging

KPS Ballast Switch Overload During Charging

Kuka · KR C2 Robot Controller

What does Ballast switch energized for too long PMx during charging mean?

The brake resistor experienced an I²t overload during the charging phase. This indicates that the ballast switch was energized for an excessive duration, possibly due to a defective ballast resistor or incorrect connection.

Common Causes

  • Ballast switch in KPS remains energized for too long during the charging phase.
  • Faulty ballast switch not de-energizing correctly.
  • Control signal for the ballast switch is stuck 'on'.
  • Incorrect timing in the charging sequence.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the ballast resistor for defects, including open circuits or incorrect resistance values.

  2. 2

    Verify the correct wiring and connection of the ballast resistor to the KPS module.

Browse all codes in this manual (58)
Verified technical data. Last updated: April 2026

Related Faults

-1General Path Replay Error-11Path Not Found-13Empty Path Data
Source: Kuka KR C2 Robot Controller
Open Manual (Page 29)Search more codes in this manual