Geared motor can rotate, but the running current exceed the rating, called the overload.
Basic reflection of the motor overload is: although more than Micro Gear Motor the rating current, but more than modest, generally do not form a larger impact current. Once the gear reduction motor overload phenomenon, we should go to find out the cause of the overload, then the right method to solve the gear reduction motor overload.
The main reason for the gear reduction motor overload analysis
1, the mechanical load is overweight, motor overload is the main characteristics of fever, and can be read from the screen to find the running current.
2, three-phase voltage imbalance, cause a certain phase of running current is too large, lead to overload trip, its characteristic is geared motor heat imbalance, read from the screen running current can not found (because of the screen shows only one phase current).
3, misoperation, the malfunction of the inverter current part of Low Rpm Electric Motor the internal current signal of detected slants big, lead to trip.
Geared motor overload checking method
1, check whether the gear reduction motor is fever, if the rise of temperature of the motor is not high, the first check the inverter electronic thermal protection function of pre whether reasonable, if there are allowance in the inverter, should be relaxed pre value of the electronic thermal protection function.
If the motor temperature rise too high, and of overload and belongs to the normal overload, then is the overload of the machine. At this time, should first can increase the transmission ratio, appropriate to reduce the load of gear reduction motor shaft. If can increase, increase the transmission ratio. If the transmission ratio does not increase, should increase the capacity of the machine.
2, check to see if the motor three-phase voltage balance, if the Gear Reduction Motor gear reduction motor side of three-phase voltage imbalance, should check whether the three-phase voltage at the inverter output balance, such as imbalance, the problem inside the inverter.
If the inverter output voltage balance, the problem on the line between inverter and motor, should check all wiring the screws are tightened, if you have any contact between the inverter and motor or other appliances, is also should check on whether the electrical terminal has been tightened and contact status of contact are in good condition.
3, motor three-phase voltage balance, should understand the working frequency of tripping
Such as gear reduction motor working frequency is low, and not the use of vector control (or without) vector control, the first to reduce the U/f ratio, if can drive load, reducing the original pre U/f ratio is too high, the field current peak is big, can reduce the U/f ratios decrease current; If reduced after fixed load, should consider to increase the capacity of the inverter; If the inverter has the function of vector control, the vector control mode should be adopted.
