ATEX Thermistor Overtemperature

What does 29 mean?

The ATEX thermistor has detected an overtemperature condition, indicating that the motor or an ATEX-rated component is exceeding its safe operating temperature. This is a critical safety fault that requires immediate attention to prevent damage or hazardous conditions.

• Motor winding temperature exceeding the specified ATEX limit due to mechanical overload, insufficient cooling, or prolonged operation at low speeds.
• Thermistor cable (e.g., connected to terminals THT+, THT-) is shorted, open, or has high resistance due to damage.
• ATEX rated component (e.g., gear reducer, fan, pump) connected to the thermistor input is overheating.
• Thermistor input parameter (e.g., P5-20) set incorrectly, leading to a false trip or incorrect temperature threshold.
• Cooling fan on the motor or component is malfunctioning, obstructed, or operating at reduced efficiency.

Click steps to track your progress.

1. 1

   Measure the resistance of the ATEX thermistor (e.g., connected to terminals THT+, THT-) at the motor side and compare it to the specified R/T curve for the sensor type (e.g., PTC, NTC).

2. 2

   Visually inspect the motor cooling fan for obstructions, damage to blades, or signs of sluggish operation.

3. 3

   Reduce the mechanical load on the motor and allow it to cool down to ambient temperature, then re-measure the thermistor resistance.

4. 4

   Verify the thermistor input type parameter (e.g., P5-20) is correctly configured for the installed ATEX sensor (e.g., PTC, KTY).

5. 5

   Check for adequate ventilation around the motor and any ATEX-rated components in the operating environment.