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:

空压机加卸载

Loading and unloading of air compressor

1、供气压力和卸载压力设定的数值过于接近

1. The set values of air supply pressure and unloading pressure are too close

当空压机达到供气压力时，若用气量突然减小，变频器来不及控制电机减速，就会造成产气量过大，从而造成卸载的情况。

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.

解决方法：将供气压力和卸载压力之间的差值设的大些，通常差值≥0.05MPa

Solution: set the difference between gas supply pressure and unloading pressure larger, usually the difference is greater than or equal to 0.05Mpa

2、当电机恒定频率运行时，面板显示压力上下波动

2. When the motor runs at a constant frequency, the panel shows that the pressure fluctuates up and down

解决方法：换一个压力传感器。

Solution: change a pressure sensor.

3、用户用气量不稳定

3. Unstable gas consumption

用户用气量不稳定，会突然增加减少很大的用气量。此时供气压力就会出现变动，变频器控制电机变频改变输出气量来维持供气压力稳定。但是电机的转速变化都是有速度的，当这个速度跟不上用气端的用气变化速度时就会造成机器的压力波动，然后可能会出现加卸载的情况。

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.

解决方法：避免突然使用多台用气设备，可以一台一台的开启用气的设备。（2）将变频器的变频速度调快，让输出气量的改变速度增快来适应用气量的变化。（3）用大容量的储气罐来缓冲。

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、用户用气量过小

4. The gas consumption of users is too small

通常变频空压机的变频范围为30%~100%，异步变频空压机的变频范围为50%~100%。当用户用气量小于压缩机下限输出气量时，气量达到设定的供气压力以后，这时候变频器会控制电机降频下限频率以下限输出气量来输出压缩气体，但是因为用气量太小，供气压力就会继续升高，直到卸载压力，机器卸载。然后供气压力下降，压力下降低于加载压力时，机器重新加载。

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.

对这种情况做一个分析。就是当用气量很小机器卸载时，该不该让压缩机进入休眠状态，或者说卸载多少时间以后再进入休眠状态。当机器卸载时，用气端也是在用气的，但是一旦压缩机进入休眠状态以后，压缩机不在产生用气，这时候供气压力会下降，下降加载压力后，机器加载。

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.

这里会出现一种情况，就是当机器从休眠状态开始重新启动时，用户的压力还在下降，很可能会出现供气压力低于加载压力，甚远低于加载压力的情况，造成供气压力过低或者供气压力波动大的情形。所以建议卸载后进入休眠状态的时间不宜过短。

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.