What should I do if the gear reduction motor is overloaded?
The geared motor can rotate, but the operating current exceeds the rated value, called overload.
The basic reflection of motor overload is that although the current exceeds the rated value, the magnitude of the excess is not large, and generally no large inrush current is formed. Once the gear reduction motor has an overload phenomenon, we should find out the cause of the overload, and then use the correct method to solve the overload problem of the geared motor.
Analysis of the main causes of overload of geared motor
1. The mechanical load is too heavy. The main feature of the overload is that the motor is hot and can be found by reading the running current from the display.
2. The three-phase voltage is unbalanced, causing the running current of a certain phase to be too large, resulting in an overload trip. The characteristic is that the geared motor is not heated evenly. It is not always found when reading the running current from the display (because the display only shows One phase current).
3. Malfunction, the current detection part inside the inverter fails, and the detected current signal is too large, causing tripping.
Gear reduction motor overload check method
1. Check if the gear reduction motor is hot. If the temperature rise of the motor is not high, first check whether the electronic thermal protection function of the inverter is pre-determined. If the inverter still has a margin, the electronic thermal protection function should be relaxed. Pre-value.
If the temperature rise of the motor is too high and the overload that occurs is a normal overload, it means that the load of the motor is too heavy. At this time, it is first necessary to increase the transmission ratio appropriately to reduce the load on the shaft of the gear reduction motor. If it can be increased, increase the transmission ratio. If the gear ratio cannot be increased, increase the capacity of the motor.
2. Check whether the three-phase voltage on the motor side is balanced. If the three-phase voltage on the side of the gear reduction motor is unbalanced, check whether the three-phase voltage at the output of the inverter is balanced. If it is not balanced, the problem is inside the inverter.
If the voltage at the output of the inverter is balanced, the problem is on the line from the inverter to the motor. Check that all the screws on the terminals are tightened. If there is a contactor or other electrical device between the inverter and the motor, Check that the terminals of the electrical appliance are tight and that the contact is in good condition.
3, the motor side three-phase voltage balance, you should understand the operating frequency when tripping
If the gear reduction motor has a lower operating frequency and no vector control (or no vector control), the U/f ratio is first lowered. If the load is still driven after the reduction, the U/f ratio of the original pre-turn is too high. The peak value of the excitation current is too large, and the current can be reduced by lowering the U/f ratio. If the load is reduced after the reduction, the capacity of the inverter should be increased. If the inverter has a vector control function, the vector should be used. control method.
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