Fan interlocking control system based on PLC (Programmable Logic Controller) and control method of fan interlocking control system

Abstract

The invention discloses a fan interlocking control system based on a PLC (Programmable Logic Controller) and a control method thereof. The fan interlocking control system comprises a PLC control subsystem, a fan manual control subsystem and two interlocking control alternating current contactors, wherein the PLC sub-control system comprises an air switch QF1, a PLC controller, a plurality of relays, a plurality of common alternating current contactors, a plurality of socket loads and a touch screen; the fan manual control subsystem comprises a switching power supply QF0, a manual control stop button SB0, a manual control start button SB2, an operation indicating lamp HG1, a fault indicating lamp HY1, a thermal relay KH1, an alternating current contactor KM1 of a fan and the fan M. Aiming at the problem that the fan in a charging room cannot be subjected to interlocking control in places where the fan operation needs to be automatically controlled in an industrial automation field, remote automatic control of the fan is realized through interlocking control.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial automation, and particularly to a fan interlock control system and a control method based on a PLC controller. Background Art

[0002] With the rapid development and progress of intelligent technologies, industrial manufacturing is constantly moving towards intelligent development. In the past, manual control of fans was difficult to meet on-site requirements, and it was necessary to develop a fan linkage control method. Summary of the Invention

[0003] In view of the problem that the fan in the charging room cannot be interlocked and controlled in places where the industrial automation site requires the fan operation to be linked and controlled, the present invention proposes a fan interlock control system and a control method based on a PLC controller, in order to achieve remote automatic interlock control of the fan, thereby reducing the labor intensity and attention of personnel and improving the working efficiency of the fan manual system.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A fan interlock control system based on a PLC controller according to the present invention is characterized by comprising: a PLC control subsystem, a fan manual control subsystem, and two AC contactors for interlock control;

[0006] The PLC sub-control system includes: an air switch QF1, a PLC controller, several relays, several ordinary AC contactors, several socket-type loads, and a touch screen;

[0007] The air switch QF1 is connected to the PLC controller through a cable;

[0008] The PLC controller is connected to the touch screen through an Ethernet cable;

[0009] The PLC controller is connected to the relay through a cable;

[0010] The relay is respectively connected to several ordinary AC contactors through a cable; each ordinary AC contactor is connected to a socket-type load through a cable;

[0011] The fan manual control subsystem includes: a switching power supply QF0, a manual control stop button SB0, a manual control start button SB2, an operation indicator light HG1, a fault indicator light HY1, a thermal relay KH1, an AC contactor KM1 of the fan, and a fan M;

[0012] The switching power supply QF0 is connected to the manual control stop button SB0 through a cable;

[0013] The manual control stop button SB0 is connected to the manual control start button SB2 via a cable;

[0014] The manual start button SB2 is connected to the AC contactor KM1 via a cable;

[0015] The running indicator light HG1 is connected to the AC contactor KM1 via a cable;

[0016] The fault indicator light HY1 is connected to the thermal relay KH1 via a cable;

[0017] The AC contactor KM1 is connected to the thermal relay KH1 via a cable;

[0018] The thermal relay KH1 is connected to the fan M via a cable.

[0019] The control signal connection between the PLC subsystem and the manual control subsystem of the fan is carried out through two interlocked AC contactors KM2 and KM3;

[0020] The PLC subsystem is connected to the coils of the two interlocked AC contactors via a cable;

[0021] The manual control subsystem of the fan is connected to the auxiliary contacts of the two interlocked AC contactors via a cable;

[0022] The stop button and the start button of the manual control system of the fan are connected in series with the normally closed contact of KM3 via a cable;

[0023] The start button of the manual control system of the fan is connected in parallel with the normally open contact of KM2 via a cable.

[0024] The control method of the fan interlock control system based on the PLC controller according to the present invention is characterized in that it includes the following steps:

[0025] Step 1: When the air switch QF1 and the switch power supply QF0 are in the power-on state and the touch screen obtains a start signal through a button, the PLC controller controls the relay to close according to the start signal, so that the corresponding ordinary AC contactor closes, and then the corresponding socket-type load is powered;

[0026] Step 2: The PLC controller sends a pulse signal with a duration of T 1 to the first interlocked AC contactor KM2 through the digital output point Q1.6, so that the first interlocked AC contactor KM2 closes within the duration T 1 ;

[0027] Step 3: When the first interlocked AC contactor KM2 is within the duration T 1When the fan is pulled in, the AC contactor KM1 coil of the fan is energized through the normally open contact of the AC contactor KM2 and forms a self-locking state, thereby starting the fan M to run. At this time, the running indicator light HG1 is on, and the fault indicator light HY1 is off;

[0028] Step 4: When the touch screen obtains a disconnection signal through another button, the PLC controller controls the relay to disconnect according to the disconnection signal, so that the corresponding ordinary AC contactor is disconnected, thereby causing the corresponding socket-type load to lose power;

[0029] Step 5: The PLC controller sends a signal of duration T through the digital output point Q1.7. 2 The pulse signal is given to the second interlock controlled AC contactor KM3, so that the second interlock controlled AC contactor KM3 is in the duration T 2 Lower suction;

[0030] Step 6: The second interlocking controlled AC contactor KM3 is in the duration T 2 When the fan is pulled in downward, the AC contactor KM1 coil of the fan is disconnected and de-energized through the normally closed contact of the AC contactor KM3, thereby stopping the fan M. At this time, the operation indicator light HG1 is off and the fault indicator light HY1 is off;

[0031] Step 7, when the fan M is started through the first interlock controlled AC contactor KM2, if the manual control stop button SB0 sends a stop signal to the fan M to stop it, the running indicator light HG1 will turn from the lit state to the extinguished state;

[0032] Step 8, when the fan M stops running through the AC contactor KM3 controlled by the second interlock, if the manual control start button SB2 sends a start signal to the fan M to start it, the running indicator light HG1 will turn from off to on;

[0033] Step 9: When the fan M is overloaded or short-circuited, the thermal relay KH1 is activated, the fault indicator light HY1 is on, and the fan M stops running.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention adopts the application technology of PLC series products in the field of industrial automation control, PLC programming and application technology, electrical product installation and wiring specifications, etc., and designs a simple and easy interlocking control method, which can combine the manual fan control system and the PLC control system for linkage control, thereby improving the working efficiency of the fan manual system.

[0036] 2. The practicality and practicability of the present invention are stronger. By adopting the interlock control method, the PLC subsystem and the manual control system of the fan are interlocked and controlled, and 2 interlock AC contactors are used to solve the problems of high labor intensity and high attention brought by the existing manual control of the fan. Only by operating the touch screen in the PLC subsystem, the operation of the fan can be interlocked to start or stop, and it is not necessary to operate the manual control button of the fan separately to start the fan system normally, thereby reducing the labor intensity of the operator and the attention during the use process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is the circuit diagram for the interlock control of the fan;

[0038] Figure 2 is the flow block diagram for the interlock control of the fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] In this embodiment, through the research on the Siemens 200SMART control system and the manual fan control system in the charging room of our factory, the manual start button and the manual stop button in the manual control system are simulated software-wise, and a fan interlock control system based on a PLC controller is proposed, including: a PLC control subsystem, a manual fan control subsystem, and 2 interlock-controlled AC contactors;

[0040] The PLC sub-control system includes: an air switch QF1, a PLC controller of the Siemens 200SMART model, several relays, several ordinary AC contactors, 10 socket-type loads, and a touch screen MP377;

[0041] The air switch QF1 is connected to the PLC controller through a cable;

[0042] The PLC controller is connected to the touch screen through an Ethernet cable;

[0043] The PLC controller is connected to the relay through a cable;

[0044] The relays are respectively connected to several ordinary AC contactors through cables; each ordinary AC contactor is connected to a socket-type load through a cable; the function of this system is to supply power to 10 sockets through the Siemens 200SMART and through the touch screen.

[0045] The manual fan control subsystem includes: a switching power supply QF0, a manual control stop button SB0, a manual control start button SB2, an operating indicator light HG1, a fault indicator light HY1, a thermal relay KH1, an AC contactor KM1 of the fan, and a fan M;

[0046] As Figure 1 shown, the switching power supply QF0 is connected to the manual control stop button SB0 through a cable;

[0047] The manual control stop button SB0 is connected to the manual control start button SB2 via a cable;

[0048] The manual start button SB2 is connected to the AC contactor KM1 via a cable;

[0049] The running indicator light HG1 is connected to the AC contactor KM1 via a cable;

[0050] The fault indicator light HY1 is connected to the thermal relay KH1 via a cable;

[0051] The thermal relay KH1 is connected to the AC contactor KM1 via a cable;

[0052] The AC contactor KH1 is connected to the fan M via a cable.

[0053] As Figure 2 shown, the interlock control links the Siemens 200SMART model PLC subsystem with the fan manual control subsystem, adding the normally open point of KM2 and the normally closed point of KM3 on the basis of the fan manual control system, so as to connect the control signals between the two through the two interlocked AC contactors KM2 and KM3;

[0054] The PLC subsystem is connected to the coils of the two interlocked AC contactors via a cable;

[0055] The fan manual control subsystem is connected to the auxiliary contacts of the two interlocked AC contactors via a cable;

[0056] The stop button and the start button in the fan manual control system are connected in series with the normally closed contact of KM3 via a cable;

[0057] The start button of the fan manual control system is connected in parallel with the normally open contact of KM2 via a cable.

[0058] This system controls the energization of the hardware AC contactors KM2 and KM3 through the output signal of the s7-200 SMART controller, which are respectively involved in the interlock control of the fan. The signal output is processed by programming the Siemens 200SMART controller. The fan is started by the energization of KM2 and released after 1 s; the fan operation is stopped by the energization of the KM3 AC contactor for 1 s and then released, so as to realize the interlock control of the fan as required.

[0059] Specifically, a control method for a fan interlock control system based on a PLC controller includes the following steps:

[0060] Step 1: When the air switch QF1 and the switching power supply QF0 are in the powered-on state and the touch screen obtains a start signal through a button, the PLC controller controls the relay to close according to the start signal, so that the corresponding ordinary AC contactor closes, and then the corresponding socket-type load is powered.

[0061] Step 2: The PLC controller sends a pulse signal with a duration of T 1 to the first interlocked AC contactor KM2 through the digital output point Q1.6, so that the first interlocked AC contactor KM2 closes within the duration T 1 .

[0062] Step 3: When the first interlocked AC contactor KM2 closes within the duration T 1 , the coil of the AC contactor KM1 of the fan is energized and self-locked through the normally open contact of the AC contactor KM2, so as to start the operation of the fan M. At this time, the operation indicator light HG1 is in the lit state and the fault indicator light HY1 is in the extinguished state.

[0063] Step 4: When the touch screen obtains a disconnection signal through another button, the PLC controller controls the relay to disconnect according to the disconnection signal, so that the corresponding ordinary AC contactor disconnects, and then the corresponding socket-type load loses power.

[0064] Step 5: The PLC controller sends a pulse signal with a duration of T 2 to the second interlocked AC contactor KM3 through the digital output point Q1.7, so that the second interlocked AC contactor KM3 closes within the duration T 2 .

[0065] Step 6: When the second interlocked AC contactor KM3 closes within the duration T 2 , the coil of the AC contactor KM1 of the fan is de-energized and disconnected through the normally closed contact of the AC contactor KM3, so that the fan M stops running. At this time, the operation indicator light HG1 is in the extinguished state and the fault indicator light HY1 is in the extinguished state.

[0066] Step 7: When the fan M is started through the first interlocked AC contactor KM2, if the manual control stop button SB0 sends a stop signal to the fan M to stop its operation, at this time, the operation indicator light HG1 will change from the lit state to the extinguished state.

[0067] Step 8: When the fan M stops running through the second interlocked AC contactor KM3, if the manual control start button SB2 sends a start signal to the fan M to start it, at this time, the operation indicator light HG1 will change from the extinguished state to the lit state.

[0068] Step 9: When the fan M is overloaded or short-circuited, the thermal relay KH1 operates, the fault indicator light HY1 is in the lit state, and the fan M stops running.

Claims

1. A fan interlocking control system based on a PLC controller, characterized in that: include: PLC control subsystem, fan manual control subsystem, 2 interlocking controlled AC contactors; The PLC sub-control system includes: air switch QF1, PLC controller, several relays, several common AC contactors, several socket-type loads, and a touch screen; The air switch QF1 is connected to the PLC controller via a cable; The PLC controller is connected to the touch screen via an Ethernet cable; The PLC controller is connected to the relay via a cable; The relays are respectively connected to a number of common AC contactors through cables; each common AC contactor is connected to a socket-type load through a cable; The fan manual control subsystem includes: a switch power supply QF0, a manual control stop button SB0, a manual control start button SB2, a running indicator light HG1, a fault indicator light HY1, a thermal relay KH1, an AC contactor KM1 of the fan, and a fan M; The switch power supply QF0 is connected to the manual control stop button SB0 via a cable; The manual control stop button SB0 is connected to the manual control start button SB2 via a cable; The manual start button SB2 is connected to the AC contactor KM1 via a cable; The operation indicator light HG1 is connected to the AC contactor KM1 via a cable; The fault indicator light HY1 is connected to the thermal relay KH1 through a cable; The AC contactor KM1 is connected to the thermal relay KH1 via a cable; The thermal relay KH1 is connected to the fan M via a cable; The PLC subsystem and the fan manual control subsystem are connected by two interlocking controlled AC contactors KM2 and KM3 for control signals; The PLC subsystem is connected to the coils of two interlocking controlled AC contactors via cables; The manual control subsystem of the fan is connected to the auxiliary contacts of two interlocking controlled AC contactors via cables; The stop button and the start button of the manual control system of the fan are connected in series with the normally closed contact of KM3 through a cable; The start button of the manual control system of the fan is connected in parallel with the normally open contact of KM2 through a cable.

2. A control method for a fan interlocking control system based on a PLC controller according to claim 1, characterized in that: The steps include: Step 1: When the air switch QF1 and the switching power supply QF0 are in the power-on state, and the touch screen obtains a start signal through a button, the PLC controller controls the relay to be attracted according to the start signal, so that the corresponding ordinary AC contactor is attracted, and then the corresponding socket load is powered; Step 2, the PLC controller sends a pulse signal with a duration of T1 to the first interlocking controlled AC contactor KM2 through the digital output point Q1.6, so that the first interlocking controlled AC contactor KM2 is energized at the duration T1; Step 3, when the first interlocking controlled AC contactor KM2 is energized at the time T1, the AC contactor KM1 coil of the fan is energized through the normally open contact of the AC contactor KM2 and forms a self-locking state, thereby starting the fan M to run, at which time the running indicator light HG1 is on, and the fault indicator light HY1 is off; Step 4: When the touch screen obtains a disconnection signal through another button, the PLC controller controls the relay to disconnect according to the disconnection signal, so that the corresponding ordinary AC contactor is disconnected, thereby causing the corresponding socket-type load to lose power; Step 5, the PLC controller sends a pulse signal of duration T2 to the second interlocking controlled AC contactor KM3 through the digital output point Q1.7, so that the second interlocking controlled AC contactor KM3 is energized at duration T2; Step 6, when the second interlocking controlled AC contactor KM3 is energized at the time T2, the AC contactor KM1 coil of the fan is disconnected and de-energized through the normally closed contact of the AC contactor KM3, thereby stopping the fan M. At this time, the running indicator light HG1 is off, and the fault indicator light HY1 is off; Step 7, when the fan M is started through the first interlock controlled AC contactor KM2, if the manual control stop button SB0 sends a stop signal to the fan M to stop it, the running indicator light HG1 will turn from the lit state to the extinguished state; Step 8, when the fan M stops running through the AC contactor KM3 controlled by the second interlock, if the manual control start button SB2 sends a start signal to the fan M to start it, the running indicator light HG1 will turn from off to on; Step 9: When the fan M is overloaded or short-circuited, the thermal relay KH1 is activated, the fault indicator light HY1 is on, and the fan M stops running.

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