Cause : Motor thermistor over temp comes when the thermistor might be disconnected. Select whether the frequency converter gives a warning or an alarm in 1-90 Motor Thermal Protection.

• Check for motor overheating.
• Check if the motor is mechanically overloaded.
• Check that the thermistor is connected correctly between either terminal 53 or 54 (analog voltage input) and terminal 50 (+10 V supply) and that the terminal switch for 53 or 54 is set for voltage.
• Check 1-93 Thermistor Source selects terminal 53 or 54.
• When using digital inputs 18 or 19, check that the thermistor is connected correctly between either terminal 18 or 19 (digital input PNP only) and terminal 50.
• If using a thermal switch or thermistor, check that the programming if matches sensor wiring.