External Motor Temperature Exceeded

¿Qué significa Ext Mot Temp ?

This fault is triggered when an external temperature sensor (e.g., PT100, PTC) connected to the motor detects that the motor's temperature has risen above a predefined safe limit. This typically indicates motor overload, inadequate motor cooling, or an issue with the motor itself. Prolonged high motor temperatures severely reduce insulation life and can lead to motor failure. This is a crucial protective measure.

• Motor operating under sustained overload, causing its internal temperature to rise above the safe limit.
• Insufficient motor cooling (e.g., blocked motor cooling fins, failed shaft-mounted fan, obstructed airflow).
• High ambient temperature surrounding the motor exceeding its specified operating range (e.g., >40°C).
• Faulty external temperature sensor (e.g., PT100, PTC) or its wiring (e.g., open circuit, short circuit).
• Incorrect VSD parameter for external temperature threshold (e.g., P1-54) or incorrect sensor type selected (e.g., P1-53).

Haga clic en los pasos para seguir su progreso.

1. 1

   Measure motor winding temperature directly using a thermal camera or contact thermometer. Compare to motor insulation class rating (e.g., Class F, max 155°C).

2. 2

   Inspect the motor cooling fan for damage or obstruction. Thoroughly clean motor cooling fins and ensure adequate airflow.

3. 3

   Verify the external temperature sensor wiring connections at the VSD input terminals (e.g., AI1, AI2) and the motor. Check for open or short circuits.

4. 4

   Measure the resistance of the external temperature sensor (e.g., PT100 should be 100 Ohms at 0°C, PTC changes significantly with temp).

5. 5

   Check VSD parameters P1-53 (external sensor type) and P1-54 (external temperature trip threshold) are correctly configured for the installed sensor.