After each maintenance and repair, the parameters of the screw air compressor need to be calibrated. Today, we'll discuss how to calibrate these parameters.
1. Loading, Unloading, and Proportional Value Calibration
To calibrate these three parameters, first determine the unloading value, which should be based on the air compressor's rated pressure and the required pressure. Then determine the loading value. The pressure difference between the unloading and loading values should be between 0.1 and 0.2 MPa. The proportional value should be between the unloading and loading values. Calibration method: Set the parameters in the microcomputer controller. If the air compressor uses push-button control, the loading and unloading parameters should be adjusted via the pressure switch, and the proportional value should be adjusted via the adjusting nut on the proportional valve.
2. Unit Internal Pressure Calibration
The unit's internal pressure is generally between 0.2 and 0.45 MPa. Calibration method: Internal pressure calibration should be performed when the unit is unloaded, and the value should be adjusted via the adjusting nut on the small pressure valve. To facilitate reading the setpoint, a pressure gauge should be installed before the small pressure valve. If the microcomputer controller has a function to display internal pressure parameters, then installing a pressure gauge is unnecessary.
3. High Temperature Protection Value Calibration
During normal operation of the screw air compressor, the temperature is generally between 65 and 98℃. Calibration method: Adjust the automatic high-temperature shutdown temperature value in the controller so that it does not exceed 105℃.