Today we'll discuss common faults in the main unit and motor of a permanent magnet variable frequency air compressor. We hope this article will be helpful.
In China, with economic development, many manufacturing enterprises have emerged. The fastest-growing sector is industry. As a type of general-purpose machinery, the "permanent magnet variable frequency air compressor" is an indispensable piece of equipment for these manufacturing enterprises.
Many permanent magnet variable frequency air compressor users have likely experienced situations where their equipment malfunctions and production ceases. Below, we'll analyze overload faults in the main unit and motor of a permanent magnet variable frequency air compressor:
1. Loose wiring
Check the power cord of the permanent magnet inverter air compressor for signs of overheating or burning. Pay particular attention to the three-phase power input and the motor input. If any are loose or short-circuited, reconnect them.
2. Voltage is too low
A typical permanent magnet variable frequency air compressor has a rated operating voltage of 380V, with a permissible fluctuation of about 5%. This voltage refers to the voltage at which the machine operates normally. On many construction sites (factories generally have more stable voltage supplies and this situation is less common), transformers are smaller. The voltage may be 400V when the equipment is off, but drop to 350V when the equipment is on, and only 360V during normal operation. While this may not be a major problem in the short term, long-term use will inevitably cause significant damage to the electrical system.
3. Clogged oil separator in permanent magnet variable frequency air compressor:
When the oil separator element is clogged, the internal pressure increases, the load increases, and the current increases, leading to overload. A common misconception is that newly replaced parts won't clog. A dirty working environment and impurities in the oil and gas tank can easily cause oil separator clogging. Don't assume that a newly replaced oil separator element will clog again after 200 hours of operation just because the environment is okay; the quality of the oil separator also plays a significant role.
4. The pressure of the permanent magnet variable frequency air compressor unit exceeds the rated pressure:
For example, a machine rated at 0.7 MPa may easily overload if the actual pressure reaches 0.75 MPa. A 7 kg air compressor should not be set to 8 kg; firstly, safety cannot be guaranteed, and secondly, the equipment's pressure resistance will be insufficient, shortening its lifespan. Purchase an air compressor with the required pressure; don't focus on price, but rather on cost-effectiveness.
5. Contactor failure in permanent magnet variable frequency air compressor:
When the contacts inside the contactor age and become poorly engaged, the contact area becomes smaller, resulting in a larger current. Overloading the air compressor is a minor issue, but burning out the electrical system is something no one wants to see.
