PTC thermistor operation

What does E.PTC mean?

This fault indicates that the resistance of the PTC thermistor, connected between inverter terminals 2 and 10, has exceeded the threshold set in Pr. 561 (PTC thermistor protection level), causing the inverter to trip. This typically signals motor overheating due to overload. This protective function is active only when Pr. 561 is set to a value other than '9999'. Continued overload and overheating can severely damage the motor.

Complete Troubleshooting Guide

1. 1

   Inspect the PTC thermistor wiring between terminals 2 and 10 for loose connections, damage, or incorrect polarity.

2. 2

   Verify the setting of Pr. 561 (PTC thermistor protection level) is appropriate for the motor and not set to the disabled value ('9999').

3. 3

   Check the motor for signs of overload or overheating and reduce the mechanical load if necessary.