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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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