Thermal motor model

Reference values for the thermal motor model: S-0-0012; S-0-0111, S-0-0135; S-0-0196, P-0-0052; P-0-0061; P-0-0062, P-0-0066 and P-0-0063.

The thermal motor model calculates the current thermal utilization (P-0-0063 in %) of the motor. This utilization display serves to determine the application-specific utilization reserves. Furthermore, the thermal motor model offers motor protection by means of the dynamic detection of overloads. The motor data for Beckhoff servo motors from the series AM8000 originate from the electronic name plate (offline from the motor data files *.xeds). The motor data generator can be used to create motor data files for third-party motors.

If a temperature sensor (e.g. KTY83-110, KTY84-130, PT1000) is installed in the motor that allows a temperature evaluation over the entire operating temperature range (see motor technical data), the motor is initialized in accordance with the current temperature.

The operating temperature cannot be measured if PTC thermistors are used that exhibit a fast increase in the resistance value in the region of the nominal response temperature (motor cut-off temperature). In this case the motor is initialized in accordance with the max. permissible ambient temperature (40 °C). It should be noted here that after switching off the 24 V system supply a waiting time (5 times the motor time constant P-0-0062, time constant 1) is required before switching on again. This ensures the thermal motor protection with the motor model. The value of the load display is incorrect if the waiting time is not adhered to.