Q Q: 506615608
The start and stop of the air compressor is usually controlled by the air pressure automatic switch (air pressure relay) directly driving the AC contactor to realize the automatic control of the motor. Most of the pneumatic automatic switches adopt mechanical structure, and use spring to compress and release energy to operate the contacts. It may be due to the congenital lack of air pressure automatic switch or the influence of improper adjustment, mechanical shock and other different reasons.
Air compressor generally does not have automatic exhaust device. After shutdown, exhaust and depressurize automatically, when the air pressure reaches the set pressure. If the exhaust valve fails, the air pressure in the air compressor cylinder can not be released, which means that the motor starts with load, which may cause starting difficulty or locked rotor fault.
Sudden power cut-off during operation: the air compressor controlled by automatic gear will be restarted in case of sudden power cut-off (such as power supply, self-contained power supply conversion) because the air pressure in the air compressor cylinder is too late to release. When the motor starts under heavy load, it is likely to cause locked rotor fault. Too frequent starting: due to the irregular peripheral gas consumption, when the gas consumption is large, the motor is forced to start frequently. When starting, the accumulation of heat allowance caused by large current is not easy to disperse, which makes the temperature rise of the motor overheat and may cause the motor to burn down.
Heavy load shutdown: the shutdown of air compressor, different from other equipment, is to stop when the maximum pressure reaches the set upper limit. Under heavy load, the AC contactor operates in sections. At this time, the arc spark is the most serious, which poses a great threat to the damage of AC contactor. The damage of AC contactor will lead to power failure. Such as unbalanced (lack of phase), etc.
Screw air compressor mechanical property fault: the air compressor is uneven load property, mechanical vibration noise, transmission parts blocked caused by wear damage and other mechanical faults, it is very easy to cause motor overload (locked rotor, blocking, etc.)