In the daily maintenance of the screw air compressor, the customer often cannot judge some small faults, but let the service provider rush to the customer, just to easily replace a device, which is a waste of money for the customer. And delayed the work. Here, according to the description of several air compressor engineers, Kelly summarized the most common eight types of faults and basic maintenance plans in daily life as follows:
1. The air compressor cannot start
First check for control voltage. If not, check if the fuses are intact. If there is control voltage, check if the control relay and time relay are running normally.
2. The air compressor is not starting smoothly
After a few seconds of starting up, it will automatically stop from the electrical side, such as whether the automatic air switch starts to jump, whether the voltage is normal, whether the intake butterfly valve is closed properly (the compressor can not be started with load), and the Y-△ start contactor and Whether the three phases of the motor are normal, etc.
3. Air compressor is not supplied with air
Check the suction valve solenoid valve for any action. If there is any action, check the butterfly valve for mechanical failure. If there is no fault, check whether the electromagnetic ISV coil has suction. After removing the ISV solenoid valve mechanical failure and coil failure, check the solenoid valve one by one. The sub-circuit where the ISV is located.
4. Air compressor exhaust pressure is too low
First, check the pressure before and after the separation, manual valve and adjust the solenoid valve 2SV, etc. whether to leak; then check the gas pipeline for leaks, whether the butterfly valve is fully open, whether the air intake regulator works normally, whether the solenoid valve 3SV, 8SV leaks, Whether the pressure switch IPS needs to be re-adjusted, etc.
5. Air compressor inlet injection and shutdown
First check the oil shut-off solenoid valve 5SV for voltage, whether the mechanical part is normal; if it is normal, check the check valve and reassemble or replace it.
6. Air compressor exhaust temperature is too high
The exhaust gas temperature is generally between 80 and 95 °C. If there is not enough oil to cool, it will cause the temperature to be too high and cause a malfunction. First check whether the ambient temperature, compressor oil, oil level, oil quality, cooling fan, etc. are normal; then check whether the oil cooler and aftercooler are clean, the temperature control valve components, the oil shutoff solenoid valve voltage and the valve body part Whether it is normal, if there is diaphragm damage, temperature control spool does not work, etc., need to be replaced; finally check whether the oil filter is dirty or need to be replaced.
7. Air compressor fuel consumption is large
Check if the oil content of the condensate discharged from the trap is too large, whether the compressor oil level is high, whether the minimum pressure valve opening pressure is normal, whether the oil return pipe is blocked, and whether the oil separation core is blocked. The above problems will affect fuel consumption and should be dealt with in a timely manner.
8. Automatic stop during air compressor operation
First, check if the machine is normal and stop automatically; then check if the automatic switch and the thermal relay are moving, whether the cooling fan motor is stopped, or the exhaust temperature is too high, or the pressure is too high, and the motor voltage is normal.
