External Motor Temperature Exceeded

What does Ext Mot Temp mean?

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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the correct wiring and functionality of the external temperature sensor and its connection to the VSD.

2. 4

   Confirm that the motor thermal parameters (e.g., sensor type, trip threshold) in the VSD are correctly set.

3. 5

   Clean any dust, debris, or build-up from the motor cooling fins to improve heat dissipation.