CN201347852Y - PLC control device for linkage starting of three air compressors - Google Patents

Abstract

The utility model discloses a PLC controlling means of three air compressor machine chain starts, it is including a first air compressor machine fault detection input unit, a second air compressor machine fault detection input unit, a third air compressor machine fault detection input unit, a CPU, a first control output unit, a first timing start unit, a second control output unit, a second timing start unit, a third control output unit, a third timing start unit, a electrical unit. The utility model aims at providing a PLC controlling means of three air compressor machine chain startings that structural design is reasonable, can in time start reserve unit.

Description

A PLC control device for chain start of three air compressors

[technical field]

The utility model relates to a PLC control device for chain start of three air compressors.

[Background technique]

At present, most of the compressed air supply design schemes are: "dual use and one backup" with a total of three screw air compressors. In this design scheme, when a certain operating air compressor fails, the backup unit cannot be started in time, causing the continuous production line to trip . In order to ensure production safety, the standby unit has always been in operation. The annual power consumption of the standby unit is as high as 240,000 kWh (30% of the rated power), which increases the failure rate of equipment and maintenance costs.

[utility model content]

The utility model overcomes the disadvantages of the above-mentioned technology, and provides a PLC control device with a reasonable structure design, which can start the three air compressors of the standby unit in time and start in chain.

In order to achieve the above object, the utility model adopts the following technical solutions:

A PLC control device for chain start of three air compressors, characterized in that it includes:

A fault detection input unit for the first air compressor, which transmits the no-cooling and water shortage signal, exhaust high temperature signal, and electrical fault signal detected from the first air compressor to the CPU;

A second air compressor fault detection input unit, which transmits the no-cooling and water shortage signal, exhaust high temperature signal, and electrical fault signal detected from the second air compressor to the CPU;

A third air compressor fault detection input unit, which transmits the no-cooling and water shortage signal, exhaust high temperature signal, and electrical fault signal detected from the third air compressor to the CPU;

A CPU, after receiving any one of the three signals output by the air compressor fault detection input unit: no cooling and water shortage signal, exhaust high temperature signal, and electrical fault signal, confirms that it is related to the fault detection of the air compressor. The air compressor corresponding to the input unit is faulty;

A first control output unit, when the first air compressor fails, outputs a stop signal to the first air compressor, and outputs a start signal to the first timing start unit;

A first timing start unit, which sends a timing start signal to the second air compressor and the third air compressor after receiving the start signal of the first control output unit;

A second control output unit, when the second air compressor fails, outputs a stop signal to the second air compressor, and outputs a start signal to the second timing start unit;

A second timing start unit, which sends a timing start signal to the first air compressor and the third air compressor after receiving the start signal of the second control output unit;

A third control output unit, when the third air compressor fails, outputs a stop signal to the third air compressor, and outputs a start signal to the third timing start unit;

A third timing start unit, which sends a timing start signal to the first air compressor and the second air compressor after receiving the start signal of the third control output unit;

A power supply unit converts AC power to DC power to power the above circuits.

Compared with the prior art, the beneficial effects of the utility model are:

1. When using the utility model to control three air compressors, any two air compressors can be used as the operating unit, and the remaining one air compressor can be used as the standby unit. When any of the two air compressors used When there are abnormal problems such as no cooling water, high exhaust temperature, electrical failure, etc., through the control of the utility model, the standby unit can be started smoothly without stopping, so as to achieve the purpose of starting the standby unit in time and ensure continuous operation. to ensure production safety.

2. When the utility model is used to control the three air compressors, it can avoid the standby unit to be used as standby in operation all the time, avoid the idle power consumption of the standby unit during operation, and reduce the equipment failure rate and maintenance cost.

[Description of drawings]

Fig. 1 is a block diagram of the utility model.

[Detailed ways]

Below in conjunction with accompanying drawing and embodiment of the present utility model, further describe in detail:

Referring to Fig. 1, the utility model is a PLC control device for chain start of three air compressors, which includes: a first air compressor fault detection input unit 1, a second air compressor fault detection input unit 2. A third air compressor failure detection input unit 3, a CPU, a first control output unit 4, a first timing start unit 5, a second control output unit 6, a second timing start unit 7, A third control output unit 8 , a third timing start unit 9 , and a power supply unit 10 .

The fault detection input unit 1 of the first air compressor can detect the no-cooling and water-shortage signal, the exhaust high-temperature signal, and the electrical fault signal from the first air compressor, and transmit the three signals to the CPU;

The fault detection input unit 2 of the second air compressor can detect no cold water shortage signal, exhaust high temperature signal, and electrical fault signal from the second air compressor, and transmit the three signals to the CPU;

The third air compressor failure detection input unit 3 can detect no cold water shortage signal, exhaust high temperature signal, and electrical fault signal from the third air compressor, and transmit the three signals to the CPU;

After the CPU receives any one of the three signals output by the above three air compressor fault detection input units: no cold water shortage signal, exhaust high temperature signal, and electrical fault signal, it confirms that it is related to the air compressor. The air compressor corresponding to the machine fault detection input unit is faulty.

When the first air compressor breaks down, the first control output unit 4 outputs a stop signal to the first air compressor under the control of the CPU, so that the first air compressor stops working immediately. The control output unit 4 outputs a starting signal to the first timing starting unit 5 at the same time; the first timing starting unit 5 sends the second air compressor and the third air compressor after receiving the starting signal of the first control output unit 4. Timing start signal to make the second air compressor and the third air compressor start within the set time, if the second air compressor and the third air compressor do not start within the set time, the The control signal sent by the start unit 5 will no longer work at a certain time, preventing the second air compressor and the third air compressor from also being in a fault state.

When the second air compressor breaks down, the second control output unit 6 outputs a stop signal to the second air compressor under the control of the CPU, so that the second air compressor stops working immediately. The control output unit 6 outputs the starting signal to the second timing starting unit 7 simultaneously; the second timing starting unit 7 sends the first air compressor and the third air compressor after receiving the starting signal of the second control output unit 6. Timing start signal to make the first air compressor and the third air compressor start within the set time, if the first air compressor and the third air compressor do not start within the set time, the The control signal that two timing starting unit 7 sends just no longer takes effect, prevents that first air compressor, the 3rd air compressor are also in failure state.

When the third air compressor breaks down, the third control output unit 8 outputs a stop signal to the third air compressor under the control of the CPU, so that the third air compressor stops working immediately, and the third air compressor stops working immediately. The control output unit 8 outputs start signal to the 3rd timing start unit 9 simultaneously; Timing start signal, so that the first air compressor and the second air compressor start within the set time, if the first air compressor and the second air compressor do not start within the set time, the second The control signal that three timing starting unit 9 sends just no longer takes effect, prevents the first air compressor, the second air compressor from also being in failure state.

The power supply unit 10 converts AC power into DC power to supply power for the above circuits.

When using the utility model to control three air compressors, any two of the air compressors can be used as the use unit, and the remaining one air compressor can be used as the standby unit. When there are no abnormal problems such as cooling water, exhaust high temperature, electrical failure (overload of the main motor, high temperature of the main motor coil, high pressure difference of the oil-fine separator, etc.), through the control of the utility model, it can be operated without stopping the vehicle. Start the standby unit smoothly to ensure the continuity of work.

Claims (1)

1, a kind of PLC control device of three air compressors chain start, it is characterized in that comprising: A first air compressor failure detection input unit (1), which transmits the no-cooling and water-shortage signal, the exhaust high temperature signal, and the electrical failure signal detected from the first air compressor to the CPU; A second air compressor fault detection input unit (2), which transmits the no-cooling and water-shortage signal, the exhaust high temperature signal, and the electrical fault signal detected from the second air compressor to the CPU; A third air compressor fault detection input unit (3), which transmits the no-cooling and water-shortage signal, the exhaust high temperature signal, and the electrical fault signal detected from the third air compressor to the CPU; A CPU, after receiving any one of the three signals output by the air compressor fault detection input unit: no cooling and water shortage signal, exhaust high temperature signal, and electrical fault signal, confirms that it is related to the fault detection of the air compressor. The air compressor corresponding to the input unit is faulty; A first control output unit (4), when the first air compressor fails, outputs a stop signal to the first air compressor, and outputs a start signal to the first timing start unit (5); A first timing start unit (5), which sends a timing start signal to the second air compressor and the third air compressor after receiving the start signal of the first control output unit (4); A second control output unit (6), when the second air compressor fails, outputs a stop signal to the second air compressor, and outputs a start signal to the second timing start unit (7); A second timing start unit (7), which sends a timing start signal to the first air compressor and the third air compressor after receiving the start signal of the second control output unit (6); A third control output unit (8), when the third air compressor fails, outputs a stop signal to the third air compressor, and outputs a start signal to the third timing start unit (9); A third timing start unit (9), which sends a timing start signal to the first air compressor and the second air compressor after receiving the start signal of the third control output unit (8); A power supply unit (10) converts AC power into DC power to power the above circuits.

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