Overtemperature protection Above a temperature of approx. 75°C on the power board (corresponds to 65–72°C outside on the back cover), the power part of the controller switches off and the error bit is set (see objects 1001h and 1003h). After cooling down and confirming the error (see table for the controlword, "Fault reset"), the controller again functions normally. The following temperature test results provide information on the temperature behavior of this controller. Temperature tests are performed under the following conditions: Operating voltage: 48 V DC Motor current: 4.2 A (stepper motor) / 6 A (BLDC motor) rms Operation mode: Velocity mode, full step, 30/100 rpm Ambient temperature: 25 °C / 45 °C Altitude of site: 500 m above sea level No external cooling in the climatic chamber, e. g., via fan Motor not flanged mounted The following graphics show the results of the temperature tests: Summary: At 25°C (+48 V, 4.2/6 A rms, Velocity Mode 30 rpm), the controller was in operation for longer than 2 hours without having been switched off. The temperature on the cover was stable at approx. 60°C. At 45°C (+48 V, 4.2/6 A rms, Velocity Mode 30 rpm), temperature protection switched off the controller after approx. 21 (stepper motor) or 14 (BLDC motor) minutes. At 45°C (+48 V, 4.2/6 A rms, Velocity Mode 100 rpm), temperature protection switched off the controller after approx. 23 (stepper motor with integrated holding brake) or 18 (BLDC motor with integrated holding brake) minutes. Note: Aside from the motor, the exact temperature behavior is also dependent on the flange connection and the heat transfer there as well as on the convection in the application. For this reason, we recommend always performing an endurance test in the actual environment for applications in which current level and ambient temperature pose a problem.