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KUKA Robot Controller
Servo/Axis · Basic
KUKA Robot KRC0355 - ACKN. FAILURE OF HEAT SINK TEMPERATURE SENSOR <axis number>
This alarm indicates that the heat sink temperature sensor for the specified axis has failed or lost communication with the KRC controller. The controller cannot acknowledge a valid temperature reading from the thermal monitoring sensor on the motor's heat sink, which is critical for preventing thermal damage to the axis drive electronics. This is a critical safety fault that prevents axis motion until resolved.
KRC0355
KUKA Robot KRC0355 - ACKN. FAILURE OF HEAT SINK TEMPERATURE SENSOR <axis number>
ACKN. FAILURE OF HEAT SINK TEMPERATURE SENSOR <axis number>
This alarm indicates that the heat sink temperature sensor for the specified axis has failed or lost communication with the KRC controller. The controller cannot acknowledge a valid temperature reading from the thermal monitoring sensor on the motor's heat sink, which is critical for preventing thermal damage to the axis drive electronics. This is a critical safety fault that prevents axis motion until resolved.
Common Causes
- Damaged or disconnected temperature sensor wiring at the motor heat sink connector
- Corroded or oxidized sensor connector pins preventing proper electrical contact
- Faulty temperature sensor element (thermistor or RTD) that has degraded or failed
- Broken sensor cable between the heat sink and the servo drive module
- Defective servo drive module or amplifier with malfunctioning sensor input circuitry
Troubleshooting Steps
- 1Note the specific axis number from the alarm message and power down the robot controller safely
- 2Visually inspect the temperature sensor connector at the motor heat sink for corrosion, looseness, or physical damage; reseat the connector firmly if loose
- 3Measure continuity and resistance of the temperature sensor using a multimeter according to KUKA specifications for that sensor type
- 4Check the sensor cable routing for pinch points, cuts, or abrasion damage along the entire length from motor to servo drive
- 5Clean all connector pins with a soft brush or compressed air and apply a thin layer of dielectric grease to improve contact reliability
- 6If no physical damage is found, replace the temperature sensor unit and perform a controller reset; if alarm persists, replace the servo drive module for that axis
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