When operating an axial flow fan, the primary monitoring factor is the motor current. Current not only indicates the fan load but also serves as a predictor of abnormal changes. Additionally, it's essential to regularly check the vibration of the motor and fan for normalcy and to detect any friction or abnormal noises. For fans operating in parallel, it's crucial to check for surge conditions. During normal operation, the fan should be stopped immediately for inspection if any of the following situations occur:
1. The axial flow fan produces strong vibrations or rubbing sounds;
2. The motor current suddenly increases and exceeds the motor's rated current;
3. The motor bearing temperature rises rapidly.
