What are the main reasons for the overload of the screw air compressor motor?

Author : RUNNINGWAY

Update time : 2021-08-06 13:28:10

One of the most prone failures of screw air compressors is the overload of the main engine motor. I believe that many companies have similar experiences when using them, mainly due to the following 5 reasons:

1. Loose wiring
Check the screw air compressor power cord for signs of heat and burn, mainly check the three-phase power line and the motor line, if there is looseness or short circuit, deal with it in time.

2. The voltage is too low
The normal working rated voltage of screw air compressor is 380V, which can fluctuate up and down around 5%. This refers to the voltage during normal operation. The transformer is relatively small. When the device is not turned on, the voltage is 400V, but when the device is turned on, the voltage drops to 350V. After normal operation, the voltage is only 360V. Short-term use is not a big problem. Long-term use will cause electrical systems. Cause great damage, so the air compressor must ensure that the rated voltage does not produce too much fluctuation.

3. The air compressor oil fine separator is blocked
The oil separation core is blocked, the internal pressure is high, the load is large, and the current will become high, so it will be overloaded. Misunderstanding: Many people think that the newly replaced oil separation core will not be blocked. In fact, this idea is wrong and has a lot to do with the working environment and working hours of the air compressor.

4. The pressure of the screw air compressor unit exceeds the rated pressure.
For example, if the actual pressure reaches 0.85MPa, the machine with 0.8MPa is prone to overload. It is recommended to purchase suitable machines according to the company's own needs and not to use equipment beyond the regulations.

5. Contactor failure of screw air compressor
The contactor of the screw air compressor is aging, the suction is not good, and the contact surface is small, which causes the current to increase. In this case, the electrical system is easily burned out. This reason is also the most likely to cause more extensive damage. If you find that the air compressor contact is not very good when checking the air compressor contactor, it is recommended to replace it as soon as possible.

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