Requirements for centrifugal fans during high-temperature trial operation

1. When starting the motor, ensure that there are no abnormal phenomena or friction noises in all parts before proceeding with operation;

2. After the centrifugal fan reaches normal speed, it should first operate under light load with the regulating damper opening between 0° and 5°. Once the bearing temperature has stabilized, continuous operation should not be less than 20 minutes;

3. After normal operation at low load, gradually increase the damper opening, but the motor current must not exceed the rated value, until the specified load is reached. Continuous operation time should not be less than 2 hours;

4. For centrifugal fans with sliding bearings, after 2 hours of load testing, the fan should be shut down for bearing inspection. The bearings should show no abnormalities. If there are localized wear marks on the alloy surface, they should be repaired, and continuous operation should not be less than 6 hours;

5. When conducting high-temperature test runs, the temperature rise rate should not exceed 50°C per minute. During cold-state test runs, the motor should not operate under overload conditions;

6. During test runs, the temperature rise of rolling bearings should not exceed the ambient temperature by more than 40°C. The temperature of sliding bearings should not exceed 65°C. The effective value (root mean square velocity) of vibration at the bearing location should not exceed 6.3 mm/s.