Analysis of loading and unloading failure of screw air compressor
Loading and unloading are the basic qualities of an air compressor. If it cannot be loaded and unloaded, the air compressor is useless". If it is not loaded, the air compressor does not have compressed air output; if it cannot be unloaded, after the lower air pressure is not available, you can imagine the consequences of "inflating" into a balloon".
Can not load, unit idling, no compressed air output, waste of electricity. Check the time relay is normal, if the display panel does not display loading, most of the time relay problem. In addition, if the unit shows the load, but there is no compressed air output, then check the loading solenoid valve is intact, the intake valve is stuck, the unit has no leakage phenomenon.
Can not be unloaded, the unit continued to pressure, more than the compressor set protection value, the unit automatically overpressure protection or safety valve action open. Check the unloading solenoid valve and the PLC master controller.
The compressor is unable to build up pressure
Inspection of electrical parts:
Loading solenoid valve failure, please electrical personnel check, if necessary replacement. When starting the compressor, the control panel display loading, at this time, PLC control program for electromagnetic valve opening signal, such as solenoid valve failure, can not be opened, the compressed gas is not by the electromagnetic valve into the valve top.
Inspection of mechanical parts:
The air filter core is seriously clogged;
The intake valve is stuck in the closed position and cannot be opened;
Tracheal leak;
Minimum pressure valve leak.
The air filter element is seriously clogged
A large amount of gas can not be absorbed and compressed. Similarly, if the intake valve can not be opened, the gas can not enter, such as the host. When loading, the solenoid valve opens, the gas through the trachea, through the solenoid valve, the top open intake valve, so that the trachea leak, the intake valve can not open. The minimum pressure valve leakage: when the compressor has just started, dozens of seconds start Y / start, compressor internal atmospheric pressure lubricating oil and compression, the compressed air is used to produce a small amount of pressing off inlet valve, when the minimum pressure valve leakage, a small amount of compressed air is directly discharged through the minimum pressure valve, intake valve without the gas cap, will not open. Check the fault, the first to start the compressor intake valve at the upper part of the air filter is unloaded, loaded, observation of the intake valve can open, such as unable to open the intake valve, then check whether the electromagnetic valve action; if there is a cylinder intake valve side, a screwdriver manual tilt cylinder; finally check the minimum pressure valve.
Unable to uninstall or uninstall while still holding pressure to open the relief valve
Inspection of electrical parts:
Solenoid valve failure, when the control panel shows the unloading, the solenoid valve can not be closed, relative to the gas or through the solenoid valve, the intake valve can not be closed.
Inspection of mechanical parts:
Failure of pressure switch;
The intake valve is not working properly;
Oil core blocked;
Gas compressor gas production equipment is less than the pressure switch failure: if the compressor itself set unloading pressure of 0.8Mpa, and when the pressure switch fails, even when the pressure reaches 0.8Mpa, the compressor also cannot be converted to uninstall. The intake valve does not work properly: when the control panel is switched to uninstall, the intake valve is not closed in time, the compressor will still produce gas, thus opening the safety valve. When the oil core is blocked, the compressor is under loading, the gas production is greater than the speed of the exhaust gas, and the pressure inside the oil and gas barrel rises slowly, thus opening the safety valve. Equipment gas consumption is greater than the compressor gas production: at this point, the compressor will always display loading.
----http://www.hqcompressor.com
