Air compressors are used in various production fields. Due to the different quality of equipment, there will be more or less faults when they are used. Common faults include high temperature shutdown, frequent loading and unloading, and failure to start due to high voltage. When the air compressor fails, many users often don’t know how to deal with it. Let’s talk about the countermeasures when the air compressor suddenly fails to start or the screw air compressor fails to start due to high pressure and low voltage.
1. Failure to start due to high voltage
The screw air compressor unit is equipped with a voltage protection device. Generally, the equipment starts automatically at low pressure and stops automatically at high pressure. It is normal. All pressure-related problems are automatically controlled by pressure switches or pressure sensors. Therefore, if the machine has a pressure problem, it is generally only necessary to adjust the pressure of the air compressor, the action range of the pressure switch, and the starting pressure set on the sensor. The pressure switch has a RANGE and DIFFE. Adjust the RANGE according to the production needs of the enterprise, and the DIFFE is generally not moved. Adjust the start and stop pressure value set by the pressure sensor. You can find the pressure setting option on the air compressor panel for adjustment.
2. Low voltage
This is a problem that many users are prone to, and the harm is often great. If the company uses an industrial frequency air compressor, it can only change the voltage by adjusting the transformer. For example, if the grid voltage is only 360V, then 380V to 220V requires a transformer replacement. However, since the cost of replacing the motor transformer is often high, it is recommended to consult the manufacturer whether the motor can bear it before deciding on the subsequent method.
If it is a variable frequency air compressor, there are many solutions. For variable frequency models, due to the circuit principle inside the inverter: the inverter changes the output power by changing the output voltage, but this voltage cannot be higher than the input voltage. If,
the input voltage is only 360V, then a machine with a rated voltage of 380V can only output to 360V. If the voltage is not enough, the inverter will increase the current. In fact, as long as the current is not too large, it can also be used. If the current is too large, the upper limit frequency can also be reduced to ensure the normal operation of the machine.
It is inevitable that the screw air compressor will fail during use. Only by mastering the basic fault handling methods can the unit be ensured to operate normally.