KUKA Robot codes
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KUKA Robot Controller

System · Basic

Alarm KRC0155

KUKA Robot KRC0155 - Warning: PC fan below nominal speed

The PC cooling fan within the KUKA KRC controller is operating below its nominal speed threshold, indicating degraded cooling performance. While the controller's thermal management is currently adequate, continued operation at reduced fan speed may lead to critical temperature conditions and potential system shutdown. This warning requires prompt investigation to prevent thermal throttling or emergency controller halt.

KUKA RobotSystemBasic

KRC0155

KUKA Robot KRC0155 - Warning: PC fan below nominal speed

Warning: PC fan below nominal speed

The PC cooling fan within the KUKA KRC controller is operating below its nominal speed threshold, indicating degraded cooling performance. While the controller's thermal management is currently adequate, continued operation at reduced fan speed may lead to critical temperature conditions and potential system shutdown. This warning requires prompt investigation to prevent thermal throttling or emergency controller halt.

Common Causes

  • Dust accumulation or obstruction in fan intake or exhaust vents
  • Bearing wear or mechanical degradation of the cooling fan motor
  • Loose or damaged fan mounting causing vibration and reduced RPM
  • Thermal sensor malfunction providing incorrect speed feedback to controller
  • Power supply voltage instability affecting fan motor performance

Troubleshooting Steps

  1. 1Power down the KRC controller and allow it to cool for 15-20 minutes before inspection
  2. 2Visually inspect the PC cooling fan and surrounding vents for dust, debris, or blockages; clean with compressed air if necessary
  3. 3Verify the fan connector is fully seated on the motherboard and check for corrosion on contacts
  4. 4Inspect the fan blades for damage, cracks, or contact with surrounding components that could impede rotation
  5. 5Monitor the cooling fan speed via the controller's diagnostic interface or system logs to confirm if speed recovers after cleaning
  6. 6If the alarm persists, replace the cooling fan unit and verify normal operation; contact KUKA service if thermal sensors require calibration

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