CN113325794A - Remote variable frequency control system based on PLC - Google Patents
Remote variable frequency control system based on PLC Download PDFInfo
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- CN113325794A CN113325794A CN202110587167.2A CN202110587167A CN113325794A CN 113325794 A CN113325794 A CN 113325794A CN 202110587167 A CN202110587167 A CN 202110587167A CN 113325794 A CN113325794 A CN 113325794A
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- 238000004891 communication Methods 0.000 claims description 20
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1101—Remote I-O
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Abstract
The invention discloses a remote variable frequency control system based on a PLC, which relates to the technical field of constant-pressure water supply and comprises the following components: the system comprises a plurality of groups of water supply units, a frequency conversion module and a remote control module, wherein the plurality of groups of water supply units comprise water pump motors, flow sensors, pressure sensors and rotating speed sensors; the water pump motor is connected in parallel in a water supply network, the flow sensor and the pressure sensor are assembled at a water outlet of the water pump motor, and the rotating speed sensor is assembled in the water pump motor. The invention realizes double-channel constant-pressure water supply regulation, has high adaptability, realizes the timeliness of water pressure regulation, has the advantages of low energy consumption, high precision and high automation degree, can effectively avoid the problem of overlarge power waste, and controls the water pump motor to carry out frequency conversion by setting multiple threshold values through the PLC control module, so that the rotating speed of the water pump motor reaches smaller error in the regulation process, and the pressure in the water supply process is ensured to be constant.
Description
Technical Field
The invention relates to the technical field of constant-pressure water supply, in particular to a remote variable-frequency control system based on a PLC (programmable logic controller).
Background
In the era of gradual shortage of water resources and electric energy, water and energy conservation become important subjects for building a sustainable development society, and the technology in the aspects of municipal water supply, high-rise water supply, factory production circulating water supply and the like is lagged behind for a long time and has low automation degree. The variable-frequency speed-regulating constant-pressure water supply control system takes the water pressure of a pipe network as a set parameter, and automatically regulates the rotating speed of a water pump motor by controlling the output frequency of a frequency converter, so that closed-loop regulation of the water pressure of the pipe network is realized, and the water supply system is automatically constant at a set pressure value. According to the water consumption, the quantity of the water pumps is controlled by the control system and the speed of the frequency converter to the water pumps is controlled, so that constant-pressure water supply is realized. The variable-frequency speed-regulating constant-pressure water supply system has the characteristics of stable starting and braking of the motor, no water hammer effect, low noise and the like. And simultaneously, the stability and the reliability of the water supply system are improved.
At present, in the research of a domestic and overseas variable-frequency speed-regulating constant-pressure water supply system, if the variable-frequency speed-regulating constant-pressure water supply system is applied to a medium-capacity and large-capacity variable-frequency constant-pressure water supply system, different required water consumption is met, the pressure of a water pipe network is ensured to be constant, and a pressure closed-loop regulating device needs to be provided outside a frequency converter. And the control of the circulation mode of the multiple water pumps needs to provide a logic control link externally. In the switching technology of frequency conversion and power frequency, a voltage reduction starting method of a main circuit connected in series with a soft starter is mostly adopted. The problems of water pressure closed-loop control and undisturbed and stable switching between the variable frequency power supply and the power frequency power supply in medium and large-capacity constant-pressure water supply systems are not fundamentally solved. The engineering of the water supply system generally adopts foreign frequency converters to control the rotating speed of the water pumps, closed-loop regulation of the water pressure of a pipe network and circulating mode control of a plurality of water pumps, and some of the engineering of the water supply system are realized by adopting programmable controllers; some of them are implemented by adopting single-chip microcomputer and correspondent software. On the switching technology of frequency conversion and power frequency, the voltage reduction starting is mostly carried out by adopting a method that a main circuit is connected with a soft starter in series; and a few control pulses for sealing the frequency converter during switching are adopted to enable the output of the frequency converter to be zero, and then the motor (water pump) is switched to a power frequency power supply. The former is easy to realize, the soft starter is a finished product, but the equipment investment is large, and the latter has small equipment investment but large frequency fluctuation, so that the pressure of a water pipe is easy to be unstable, and the water hammer effect is generated.
The invention patent CN 111042269A of retrieval China discloses a constant-pressure water supply system, which comprises a control system, a water supply device, a pressure detection device, a waterproof backflow device, a display device and a water storage device; the method comprises the following steps: the control system is used for controlling the whole constant-pressure water supply system; the water supply device conveys the underground water to a constant-pressure water supply system; the pressure detection device is used for detecting pressure; the water backflow prevention device is used for preventing water backflow; the display device is used for displaying the working state and pressure of the constant-pressure water supply system; the water storage device is used for storing water. But the adaptability is poor, and the method has limitations and can not meet the use requirements of different environments.
The invention patent CN 104712019A of retrieval China discloses a constant-pressure water supply control system, and belongs to the technical field of automatic control. The constant-pressure water supply control system comprises a single chip microcomputer, an alarm module, a pressure detection module, a pump driving module, a pump, a liquid crystal display module, a frequency converter module and a communication interface module. The method has the advantages of high stability, low noise, high reliability, undisturbed switching and the like. But the method has the defects of poor adaptability, low automation degree, high energy consumption and low precision.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides a remote variable frequency control system based on a PLC (programmable logic controller), which has the advantages of high adaptability, timeliness of water pressure regulation, low energy consumption, high precision and high automation degree by virtue of double-channel constant-pressure water supply regulation, can effectively avoid the problem of overlarge power waste, and can be used for controlling a water pump motor to carry out variable frequency by virtue of multi-threshold setting of a PLC control module, so that the rotating speed of the water pump motor reaches smaller error in the regulation process, the pressure in the water supply process is ensured to be constant, and the technical problems in the related art are solved.
The technical scheme of the invention is realized as follows:
a remote variable frequency control system based on PLC comprises: the system comprises a plurality of groups of water supply units, a frequency conversion module and a remote control module, wherein the frequency conversion module is connected with the water supply units;
the water supply units comprise water pump motors, flow sensors, pressure sensors and rotating speed sensors;
the water pump motor is connected in parallel in a water supply network, the flow sensor and the pressure sensor are assembled at a water outlet of the water pump motor, and the rotating speed sensor is assembled in the water pump motor;
the frequency conversion module comprises a PLC control module, a constant voltage actuator, a frequency conversion start-stop module, a relay and a frequency converter;
the constant-voltage control module and the variable-frequency start-stop module are electrically connected with the PLC control module, and the constant-voltage actuator is respectively electrically connected with the constant-voltage control module and the water pump motor;
the variable-frequency starting and stopping module is electrically connected with the relay and the frequency converter in sequence, and the frequency converter is electrically connected with the water pump motor;
the remote control module comprises a communication module and a server, and the communication module is electrically connected with the PLC control module.
Further, the water supply pipe network is connected to underground water, and the water pump motor is used for conveying water in the water supply pipe network to constant-pressure water supply;
the flow sensor is used for detecting flow information of a water outlet of the water pump motor and sending water pressure information to the PLC control module;
the pressure sensor is used for detecting water pressure information of the water outlet of the water pump motor and sending the water pressure information to the PLC control module;
and the rotation speed sensor is used for detecting and driving the working rotation speed information of the water pump motor and sending the water pressure information to the PLC control module.
Further, the PLC control module is used for receiving and sending instructions and performing constant-pressure water supply control;
the constant pressure control module is used for receiving flow information, water pressure information and rotating speed information, generating a control signal according to the flow information, the water pressure information and the rotating speed information, and sending the control signal to the constant pressure actuator;
and the constant-pressure actuator is used for receiving the control signal and controlling and driving the water pump motor according to the control signal.
Further, the frequency conversion start-stop module is used for receiving the PLC control module instruction signal to carry out frequency conversion start-stop of the frequency converter;
and the frequency converter is used for receiving the instruction signal and controlling and driving the water pump motor according to the instruction signal.
Further, the PLC control module further includes a PID processing unit, and the PID processing unit sets a pressure threshold in advance, where the pressure threshold includes a first pressure threshold and a second pressure threshold, and the second pressure threshold is greater than the first pressure threshold.
Further, the constant pressure control module generates a control signal according to the flow information, the water pressure information and the rotating speed information, and sends the control signal to the constant pressure actuator, and the method comprises the following steps:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
if the current water pressure information is smaller than the first pressure threshold value, the constant-pressure control module generates a first control signal for controlling the rotation speed of the water pump motor to be reduced, controls the frequency of the frequency converter to be reduced, and reduces the power of the water pump motor;
and if the current water pressure information is greater than the first pressure threshold and less than the second pressure threshold, the constant-pressure control module generates a second control signal for controlling the rotation speed of the water pump motor to be reduced, controls the frequency of the frequency converter to be reduced, and reduces the power of the water pump motor.
Further, the method also comprises the following steps:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
and if the current pressure signal is greater than the second pressure threshold value, the PLC control module generates a third control signal for controlling the rotation speed of the water pump motor to be reduced, controls the frequency of the frequency converter to be increased and improves the power of the water pump motor.
Further, still including the early warning module that is used for the information early warning, the early warning module with PLC control module electric connection includes following step:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
and if the current pressure signal is an abnormal signal, performing information interaction with the server through the communication module.
Further, the communication module is 2G/3G/4G/5G communication or ZigBee communication.
The invention has the beneficial effects that:
the invention relates to a remote variable frequency control system based on PLC, which regulates and controls a plurality of groups of water supply units by a variable frequency module, receives flow information, water pressure information and rotating speed information by a constant voltage control module, generates control signals according to the flow information, the water pressure information and the rotating speed information, sends the control signals to a constant voltage actuator to control and drive a water pump motor, receives a PLC control module instruction signal by a variable frequency start-stop module to carry out variable frequency start-stop of a frequency converter, controls and drives the water pump motor according to the instruction signal, realizes double-channel constant voltage water supply regulation, has the advantages of high adaptability, timeliness of water pressure regulation, low energy consumption, high precision and high automation degree, can effectively avoid the problem of overlarge power waste, and in addition, the PLC control module carries out multi-threshold setting to control the water pump motor to carry out variable frequency, so that the rotating speed of the water pump motor achieves smaller error in the regulation process, ensuring the constant pressure of the water supply process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a first schematic block diagram of a PLC-based remote variable frequency control system according to an embodiment of the present invention;
FIG. 2 is a second schematic block diagram of a PLC-based remote variable frequency control system according to an embodiment of the present invention;
fig. 3 is a first schematic flow chart of a PLC-based remote variable frequency control system according to an embodiment of the present invention;
fig. 4 is a second schematic flowchart of a PLC-based remote variable frequency control system according to an embodiment of the present invention.
In the figure:
1. a water supply unit;
11. a water pump motor; 12. a flow sensor; 13. a pressure sensor; 14. a rotational speed sensor;
2. a frequency conversion module;
21. a PLC control module; 22. a constant voltage control module; 23. a constant pressure actuator; 24. a variable frequency start-stop module; 25. a relay; 26. a frequency converter;
3. a remote control module;
31. a communication module; 32. a server side;
4. an early warning module;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
According to an embodiment of the invention, a remote variable frequency control system based on a PLC is provided.
As shown in fig. 1 to 2, a PLC-based remote variable frequency control system according to an embodiment of the present invention includes: the system comprises a plurality of groups of water supply units 1, a frequency conversion module 2 and a remote control module 3, wherein the frequency conversion module is connected with the water supply units;
the multi-group water supply unit 1 comprises a water pump motor 11, a flow sensor 12, a pressure sensor 13 and a rotating speed sensor 14;
the water pump motor 11 is connected in parallel in a water supply network, the flow sensor 12 and the pressure sensor 13 are assembled at the water outlet of the water pump motor 11, and the rotating speed sensor 14 is assembled in the water pump motor 11;
the frequency conversion module 2 comprises a PLC control module 21, a constant voltage control module 22, a constant voltage actuator 23, a frequency conversion start-stop module 24, a relay 25 and a frequency converter 26;
the constant-voltage control module 22 and the variable-frequency start-stop module 24 are electrically connected with the PLC control module 21, and the constant-voltage actuator 23 is electrically connected with the constant-voltage control module 22 and the water pump motor 11 respectively;
the variable frequency starting and stopping module 24 is electrically connected with the relay 25 and the frequency converter 26 in sequence, and the frequency converter 26 is electrically connected with the water pump motor 11;
the remote control module 3 comprises a communication module 31 and a service end 32, and the communication module 31 is electrically connected with the PLC control module 21.
Wherein, the water supply network is connected with the underground water, and the water pump motor 11 is used for conveying the water in the water supply network to the constant-pressure water supply;
the flow sensor 12 is used for detecting flow information of a water outlet of the water pump motor 11 and sending water pressure information to the PLC control module 21;
the pressure sensor 13 is used for detecting water pressure information of the water outlet of the water pump motor 11 and sending the water pressure information to the PLC control module 21;
and the rotating speed sensor 14 is used for detecting the working rotating speed information of the water pump motor 11 and sending the water pressure information to the PLC control module 21.
The PLC control module 21 is used for receiving and sending instructions and performing constant-pressure water supply control;
the constant pressure control module 22 is used for receiving the flow information, the water pressure information and the rotating speed information, generating a control signal according to the flow information, the water pressure information and the rotating speed information, and sending the control signal to the constant pressure actuator 23;
and the constant pressure actuator 23 is used for receiving the control signal and controlling the motor 11 of the water pump according to the control signal.
The variable-frequency start-stop module 24 is configured to receive an instruction signal of the PLC control module 21 and perform variable-frequency start-stop of the frequency converter 26;
and the frequency converter 26 is used for receiving the instruction signal and controlling the motor 11 for driving the water pump according to the instruction signal.
By means of the above technical scheme, regulate and control multiunit water supply unit 1 through carrying out frequency conversion module 2, realized the ageing of water pressure regulation, it is low to have an energy consumption, and the precision is high, and the advantage that degree of automation is high can effectively avoid the too big problem of power waste, in addition, carry out many threshold values by PLC control module 21 and set for control water pump motor and carry out the frequency conversion, make water pump motor 11's rotational speed reach littleer error in accommodation process, ensure the invariant of water supply process pressure.
In addition, as shown in fig. 3, the PLC control module 21 further includes a PID processing unit, and the PID processing unit sets a pressure threshold in advance, where the pressure threshold includes a first pressure threshold and a second pressure threshold, and the value of the second pressure threshold is greater than the value of the first pressure threshold.
The constant pressure control module 22 generates a control signal according to the flow information, the water pressure information and the rotating speed information, and sends the control signal to the constant pressure actuator 23, and the method includes the following steps:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
if the current water pressure information is smaller than the first pressure threshold, the constant pressure control module 22 generates a first control signal for controlling the rotation speed of the water pump motor 11 to be reduced, controls the frequency of the frequency converter 26 to be reduced, and reduces the power of the water pump motor 11;
if the current water pressure information is greater than the first pressure threshold and less than the second pressure threshold, the constant-pressure control module 22 generates a second control signal for controlling the rotation speed of the water pump motor 11 to be reduced, and controls the frequency of the frequency converter 26 to be reduced, so as to reduce the power of the water pump motor 11.
By means of the above scheme, receive flow information, water pressure information and rotational speed information and according to flow information, water pressure information and rotational speed information generation control signal through constant voltage control module 22 to control signal transmission to constant voltage executor 23 control drive water pump motor 11, realize the constant voltage water supply and adjust, not only the response is timely, and the energy consumption is low, and the precision is high, and the advantage that degree of automation is high can effectively avoid the too big problem of power waste.
In addition, as shown in fig. 4, specifically, the method further includes the following steps:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
if the current pressure signal is greater than the second pressure threshold, the PLC control module 21 generates a third control signal for controlling the rotation speed of the water pump motor 11 to be reduced, and controls the frequency of the frequency converter 26 to be increased, so as to increase the power of the water pump motor 11.
Wherein, still including the early warning module 4 that is used for the information early warning, early warning module 4 and PLC control module 21 electric connection include following step:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
if the current pressure signal is an abnormal signal, the communication module 31 performs information interaction with the server 32.
The communication module 31 is 2G/3G/4G/5G communication or ZigBee communication.
With the help of the above scheme, start to stop module 24 through the frequency conversion and receive PLC control module 21 command signal and carry out the frequency conversion of converter 26 and start to stop to according to command signal control drive water pump motor 11, realize the constant voltage water supply and adjust, not only the response is timely, and the energy consumption is low, and the precision is high, and the advantage that degree of automation is high can effectively avoid the too big problem of power waste.
In summary, according to the above technical solution of the present invention, the plurality of sets of water supply units 1 are regulated and controlled by the frequency conversion module 2, the constant voltage control module 22 receives flow rate information, water pressure information and rotation speed information, generates control signals according to the flow rate information, the water pressure information and the rotation speed information, and sends the control signals to the constant voltage actuator 23 to control the driving of the water pump motor 11, and the frequency conversion start-stop module 24 receives an instruction signal of the PLC control module 21 to start and stop the frequency converter 26 in a frequency conversion manner, and controls the driving of the water pump motor 11 according to the instruction signal, so as to realize two-channel constant voltage water supply regulation, which not only has high adaptability, but also realizes timeliness of water pressure regulation, has the advantages of low energy consumption, high precision, high automation degree, and can effectively avoid the problem of excessive power waste, and in addition, the PLC control module 21 performs multi-threshold setting to control the water pump motor to perform frequency conversion, the rotating speed of the water pump motor 11 is enabled to achieve smaller error in the adjusting process, and the pressure in the water supply process is ensured to be constant.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a long-range variable frequency control system based on PLC which characterized in that includes: the system comprises a plurality of groups of water supply units (1), a frequency conversion module (2) and a remote control module (3), wherein the frequency conversion module is connected with the water supply units;
the water supply units (1) comprise water pump motors (11), flow sensors (12), pressure sensors (13) and rotating speed sensors (14);
the water pump motor (11) is connected in a water supply network in parallel, the flow sensor (12) and the pressure sensor (13) are assembled at a water outlet of the water pump motor (11), and the rotating speed sensor (14) is assembled in the water pump motor (11);
the frequency conversion module (2) comprises a PLC control module (21), a constant voltage control module (22), a constant voltage actuator (23), a frequency conversion start-stop module (24), a relay (25) and a frequency converter (26);
the constant-voltage control module (22) and the variable-frequency start-stop module (24) are electrically connected with the PLC control module (21), and the constant-voltage actuator (23) is respectively electrically connected with the constant-voltage control module (22) and the water pump motor (11);
the variable-frequency starting and stopping module (24) is electrically connected with the relay (25) and the frequency converter (26) in sequence, and the frequency converter (26) is electrically connected with the water pump motor (11);
the remote control module (3) comprises a communication module (31) and a service end (32), and the communication module (31) is electrically connected with the PLC control module (21).
2. The PLC-based remote variable frequency control system according to claim 1, wherein the water supply network is connected to ground water, and the water pump motor (11) thereof is used for delivering water in the water supply network to constant pressure water supply;
the flow sensor (12) is used for detecting flow information of a water outlet of the water pump motor (11) and sending water pressure information to the PLC control module (21);
the pressure sensor (13) is used for detecting water pressure information of a water outlet of the water pump motor (11) and sending the water pressure information to the PLC control module (21);
and the rotating speed sensor (14) is used for detecting and driving the working rotating speed information of the water pump motor (11) and sending the water pressure information to the PLC control module (21).
3. The PLC-based remote variable frequency control system according to claim 2, wherein the PLC control module (21) is configured to receive and transmit commands and perform constant pressure water supply control;
the constant pressure control module (22) is used for receiving the flow information, the water pressure information and the rotating speed information, generating a control signal according to the flow information, the water pressure information and the rotating speed information, and sending the control signal to the constant pressure actuator (23);
and the constant-pressure actuator (23) is used for receiving a control signal and controlling and driving the water pump motor (11) according to the control signal.
4. The PLC-based remote variable-frequency control system according to claim 3, wherein the variable-frequency start-stop module (24) is configured to receive a PLC control module (21) instruction signal to start and stop the variable-frequency of the frequency converter (26);
and the frequency converter (26) is used for receiving the instruction signal and controlling the motor (11) for driving the water pump according to the instruction signal.
5. The PLC-based remote variable frequency control system according to claim 4, wherein the PLC control module (21) further comprises a PID processing unit, the PID processing unit sets a pressure threshold in advance, wherein the pressure threshold comprises a first pressure threshold and a second pressure threshold, and the second pressure threshold is greater than the first pressure threshold.
6. The PLC-based remote variable frequency control system according to claim 5, wherein the constant pressure control module (22) generates a control signal according to flow information, water pressure information and rotation speed information and transmits the control signal to the constant pressure actuator (23), comprising the steps of:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
if the current water pressure information is smaller than the first pressure threshold value, the constant pressure control module (22) generates a first control signal for controlling the rotation speed of the water pump motor (11) to be reduced, controls the frequency of the frequency converter (26) to be reduced, and reduces the power of the water pump motor (11);
if the current water pressure information is larger than the first pressure threshold and smaller than the second pressure threshold, the constant pressure control module (22) generates a second control signal for controlling the rotation speed of the water pump motor (11) to be reduced, controls the frequency of the frequency converter (26) to be reduced, and reduces the power of the water pump motor (11).
7. The PLC-based remote variable frequency control system of claim 6, further comprising the steps of:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
and if the current pressure signal is greater than the second pressure threshold value, the PLC control module (21) generates a third control signal for controlling the rotation speed of the water pump motor (11) to be reduced, controls the frequency of the frequency converter (26) to be increased, and improves the power of the water pump motor (11).
8. The PLC-based remote variable frequency control system according to claim 7, further comprising an early warning module (4) for information early warning, wherein the early warning module (4) is electrically connected with the PLC control module (21), and the PLC-based remote variable frequency control system comprises the following steps:
the PID processing unit judges the relationship between the received pressure signal and a preset pressure threshold value;
and if the current pressure signal is an abnormal signal, performing information interaction with the server (32) through the communication module (31).
9. The PLC-based remote variable frequency control system according to claim 1, wherein the communication module (31) is 2G/3G/4G/5G communication or ZigBee communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110587167.2A CN113325794A (en) | 2021-05-27 | 2021-05-27 | Remote variable frequency control system based on PLC |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110587167.2A CN113325794A (en) | 2021-05-27 | 2021-05-27 | Remote variable frequency control system based on PLC |
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| CN113325794A true CN113325794A (en) | 2021-08-31 |
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| CN202110587167.2A Pending CN113325794A (en) | 2021-05-27 | 2021-05-27 | Remote variable frequency control system based on PLC |
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| CN (1) | CN113325794A (en) |
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