How to Solve the Motor Overload Alarm?
A motor overload alarm during operation typically indicates that the load applied to the motor has exceeded its rated capacity, leading to an abnormal rise in current or activation of the thermal protection mechanism. The primary causes of motor overload alarms and their corresponding solutions are as follows:
3) Mechanical failure causes motor overload alarm
Issues such as bearing damage, rotor friction or coupling misalignment in mechanical equipment can increase internal resistance, leading to motor overload alarms. Another scenario involves the failure of the mechanical cooling system— such as a malfunctioning fan or blocked air duct, which can cause rapid temperature rise and likewise trigger an overload alarm.
4) Equipment configuration or parameter problems lead to motor overload alarm
If an undersized motor is selected during equipment configuration, it will operate at full load for extended periods, eventually trigger a motor overload alarm. In addition, incorrect parameter settings on the inverter or driver, such as an excessively short acceleration time or an overly high current limit—can also lead to motor overload alarms.
1. Analysis of the core causes of motor overload alarm
1) Excessive load causes motor overload alarm An excessive load on the motor can lead to a sudden increase in mechanical resistance, resulting in issues such as seized bearings or jammed conveyor belts. In addition, prolonged high-load operation that exceeds the motor's design capacity can also trigger overload conditions. Excessive load inertia can also cause momentary motor overload. For example, when starting a large fan, the significant inertia that must be overcome can lead to an instantaneous overload. 2) Power supply abnormality causes motor overload alarm Power supply abnormalities can trigger motor overload alarms. When the voltage is too low, the motor must draw higher current to maintain output power, which can lead to overload. Voltage fluctuates can also destabilize the power supply, affecting the motor torque characteristics, further increasing the risk of motor overload.
3) Mechanical failure causes motor overload alarm
Issues such as bearing damage, rotor friction or coupling misalignment in mechanical equipment can increase internal resistance, leading to motor overload alarms. Another scenario involves the failure of the mechanical cooling system— such as a malfunctioning fan or blocked air duct, which can cause rapid temperature rise and likewise trigger an overload alarm.
4) Equipment configuration or parameter problems lead to motor overload alarm
If an undersized motor is selected during equipment configuration, it will operate at full load for extended periods, eventually trigger a motor overload alarm. In addition, incorrect parameter settings on the inverter or driver, such as an excessively short acceleration time or an overly high current limit—can also lead to motor overload alarms.