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KUKA Robot Controller
Overheat/Thermal · Intermediate
KUKA Robot KRC0158 - Overtemperature fan
This alarm indicates that one of the dual redundant cooling fans in the KUKA KRC controller cabinet has failed or is operating abnormally, causing insufficient cooling airflow and elevated internal temperatures. The system monitors both fans for proper operation, and this alarm triggers when fan speed falls below acceptable thresholds or when thermal sensors detect overtemperature conditions correlating to fan malfunction.
KRC0158
KUKA Robot KRC0158 - Overtemperature fan
Overtemperature fan
This alarm indicates that one of the dual redundant cooling fans in the KUKA KRC controller cabinet has failed or is operating abnormally, causing insufficient cooling airflow and elevated internal temperatures. The system monitors both fans for proper operation, and this alarm triggers when fan speed falls below acceptable thresholds or when thermal sensors detect overtemperature conditions correlating to fan malfunction.
Common Causes
- Fan motor bearing failure or mechanical blockage
- Fan connector loose or corroded electrical contacts
- Dust accumulation or airflow obstruction in fan intake/exhaust
- Fan control circuit failure or PWM driver malfunction on control board
- Thermal sensor malfunction providing false overtemperature reading
Troubleshooting Steps
- 1Power down the robot controller completely and allow 15 minutes for safe discharge before inspection
- 2Visually inspect both cabinet fans for visible damage, debris obstruction, or bearing play; verify connector seating at fan motor terminals
- 3Clean fan intake filters and exhaust vents using compressed air to remove dust accumulation that restricts airflow
- 4Check thermal sensor connections and measure cabinet internal temperature with external thermometer; compare against controller display readings
- 5Test individual fan operation by applying 24VDC directly to suspect fan connector (with proper precautions) to isolate motor versus control circuit failure
- 6Replace the defective fan unit with an approved KUKA spare part matching the cabinet model specification; reinstall and verify alarm clears during thermal equilibration cycle
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