Analysis of overload fault of main engine and motor of permanent magnet variable frequency air compressor
In China, with the development of the economy, many production enterprises have emerged. The fastest growing is still industry. As a general-purpose mechanical "permanent magnet inverter air compressor", it is an indispensable equipment for these manufacturers.
It is believed that many users of permanent magnet variable frequency air compressors have experienced the failure of permanent magnet inverter air compressor equipment to produce. The following small series gives you an analysis of the permanent magnet inverter air compressor mainframe and motor overload fault:
1, the wiring is loose
Check if there is any trace of heat and burn on the power cord of the input permanent magnet inverter air compressor. Mainly check the three-phase electric incoming line and the motor is incoming. If there is loose or short circuit, then it is good to give a reconnection.
2, the voltage is too low
The general permanent magnet variable frequency air compressor has a rated working voltage of 380V, and the upper and lower limits are allowed to float at around 5%. The voltage mentioned here is the normal operating voltage of the machine. Because there are many construction sites (the factory voltage supply is relatively stable, this is not the case). The transformer is relatively small. When the device is not turned on, the voltage is 400V, but the device is turned off. Up to 350V, normal operation, the voltage is only 360V, the short-term use problem is not big, if long-term use, it is bound to cause great damage to the electrical system.
3, permanent magnet variable frequency air compressor oil separator is blocked:
The oil core is clogged, the internal pressure is high, the load is hit, the current is high, so it will be overloaded. A misunderstanding: Do not think that you have not blocked the new things for a long time, the site environment is dirty, the impurities in the oil and gas barrels are easy to block the oil, do not think that your new oil core, the environment is OK, but run for 200 hours It is blocked again, and the quality of the oil is also very much related.
4. The permanent magnet variable frequency air compressor unit pressure exceeds the rated pressure:
For example, for a 0.7 MPa machine, the actual pressure is 0.75 MPa, which is prone to overload. The 7 kg air compressor should not be adjusted to 8 kg. First, the safety cannot be guaranteed. Second, the equipment has insufficient pressure resistance and the life is shortened. How much pressure to buy, how much pressure air compressor to buy, do not think that chasing its price, we should pursue cost-effective.
5, permanent magnet inverter air compressor contactor failure:
The contact inside the contactor is aging, the suction is poor, the contact surface is small, the current is large, and the overload of the air compressor is a trivial matter. The burning of the electrical system is something that people are not willing to do.
