Air compressors are commonly used power units, mainly as a small power source for enterprises. However, the air supply volume of a single air compressor is not large. For a place or enterprise that requires a large amount of air supply, the air supply volume is insufficient, which affects normal production. If a large air compressor is used, the procurement, maintenance and operation costs will be greatly increased.

If the required air supply is not large, and several air compressors can be used, we can solve this problem by using multiple air compressors at the same time. However, when multiple air compressors are running at the same time, electrical control will occur. The problem is that each air compressor is controlled by the air pressure relay of the air compressor to keep the control pressure constant within a certain range. When running at the same time, it will be found that in most cases, no matter how The upper and lower limits of the air pressure relays of each device always have one (or two) devices running for a long time, while other devices are not operated unless the power is disconnected artificially. To this end, it is necessary to realize automatic control of each air compressor. Below we take the PLC to control the rotation of four air compressors as an example.

2 rotation work principle and realization

The device is controlled by the Delta DVP14ES00R2 PLC and is equipped with a touch screen. The entire device is highly reliable and easy to operate.

2. 1 hardware selection

Programmable controller: The input requires 2 points (high pressure, low point) and the output requires 4 points. Consider leaving room for future expansion, choose Delta DVP14ES00R2 with 8 input and 5 output.

Touch screen: Eview MT506L is selected; intermediate relay: OMRON MY2NJ - AC220 V is selected; rotation control part: To ensure the safe operation of the equipment, the pneumatic relay used by the original equipment is reserved. A 1. 6 MPa electrolysis point pressure gauge was used to control the starting and stopping pressure of each air compressor.

2. 2 control program

The air compressor rotation operation control includes two parts of control and monitoring settings.

The monitoring settings are implemented by a touch screen. It mainly includes the following interfaces (indicative interface of current operating status, setting interface of a certain air compressor damage, query interface of each air compressor running time, etc.).

The control software is the core of the rotation operation, which is realized by the PLC running program. After receiving the input signal, the PLC (including the upper limit and lower limit of the current electric contact pressure gauge, whether the air compressor is damaged or not, whether it can be operated, etc.) is pre-set. The fixed rotation time (set on the touch screen) to control the current operation of a certain air compressor, one for auxiliary operation and by whom to rotate. In this program, if there is a power outage and power is restored, the rotation will still be performed in the original order.

The artificial rotation control air compressor operation belongs to the forced disconnection motor operation. At this time, the pneumatic relay contact is not disconnected, and the pipeline pressure between the piston and the check valve is not eliminated, so that the air compressor is started with pressure when restarting. The motor is difficult to start and the motor is not safe to operate. In order to solve this problem, an electromagnetic reversing valve is installed to be connected in parallel with the pneumatic relay. When the motor starts, the solenoid valve energizes to close the valve; when the motor stops, the solenoid valve loses power to open the valve, and vents the pipe between the check valve and the piston.

3 Conclusion

The application of PLC to control the air compressor rotation operation not only solves the defect that a single air compressor can not provide large-flow compressed air, but also avoids the damage of the compression cylinder caused by the burnout of the motor and the long-term high temperature of the cylinder due to the long-term operation of a single air compressor. Failure, reducing maintenance costs and ensuring safe production.

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