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
Check the ballast resistor for defects, including open circuits or incorrect resistance values.
- 2
Verify the correct wiring and connection of the ballast resistor to the KPS module.
Verified technical data. Last updated: March 2026
Related Faults
Source: Kuka KR C2 Robot Controller