来源：https://www.sdqyjn.com/ 日期：2021-06-23 浏览量：
Some users often encounter frequent loading and unloading of air compressor in the process of using air compressor, and the main reasons for this situation are as follows:
Loading and unloading of air compressor
1. The set values of air supply pressure and unloading pressure are too close
When the air compressor reaches the air supply pressure, if the air consumption suddenly decreases and the frequency converter has no time to control the motor deceleration, it will cause excessive gas production and unloading.
Solution: set the difference between gas supply pressure and unloading pressure larger, usually the difference is greater than or equal to 0.05Mpa
2. When the motor runs at a constant frequency, the panel shows that the pressure fluctuates up and down
Solution: change a pressure sensor.
3. Unstable gas consumption
The user's gas consumption is unstable, which will suddenly increase and reduce a lot of gas consumption. At this time, the air supply pressure will change, and the frequency converter controls the motor to change the output air volume to maintain the stable air supply pressure. But the change of motor speed has speed. When this speed can't keep up with the change speed of gas end, it will cause the pressure fluctuation of the machine, and then loading and unloading may occur.
Solution: avoid the sudden use of multiple gas equipment, you can turn on the gas equipment one by one（ 2) Adjust the frequency conversion speed of frequency converter to make the change speed of output gas increase to adapt to the change of gas consumption（ 3) Buffer with a large capacity air tank.
4. The gas consumption of users is too small
Generally, the frequency range of variable frequency air compressor is 30% ~ 100%, and the frequency range of asynchronous variable frequency air compressor is 50% ~ 100%. When the user's gas consumption is less than the lower limit output gas of the compressor, and the gas volume reaches the set gas supply pressure, the frequency converter will control the motor to reduce the frequency below the lower limit frequency and limit the output gas volume to output compressed gas. However, because the gas consumption is too small, the gas supply pressure will continue to rise until the unloading pressure and the machine unloading. Then the air supply pressure drops, and when the pressure drops below the loading pressure, the machine reloads.
Make an analysis of this situation. That is, when the gas consumption is very small, when the machine is unloaded, should the compressor enter the sleep state, or how much time after unloading to enter the sleep state. When the machine is unloaded, the gas end is also using gas, but once the compressor enters the sleep state, the compressor will no longer produce gas. At this time, the gas supply pressure will drop. When it drops to the loading pressure, the machine will load.
There will be a situation here, that is, when the machine starts to restart from the sleep state, the user's pressure is still falling. It is very likely that the air supply pressure is lower than the loading pressure, or even far lower than the loading pressure, resulting in the situation that the air supply pressure is too low or the air supply pressure fluctuates greatly. Therefore, it is suggested that the time to enter the sleep state after unloading should not be too short.