Intelligent water supply simulation device

Abstract

The utility model provides an intelligent water supply simulation device, comprising a frequency converter, a PLC, a motor, a contactor KM, a digital display instrument, a trigger, a relay, a thermistor and a transmitter, the PLC is respectively connected with a button, the digital display instrument, the frequency converter, the relay and the trigger, and a DC power supply is connected with the trigger, the PLC, the transmitter and the relay; the digital display instrument is connected with the PT100 thermistor through the transmitter; the main loop of the frequency converter is connected with the contactor KM and the motor; the relay is connected with the contactor, simulation fault removal can be carried out at any time, and through manual fault design, a learner can have a comprehensive understanding of the intelligent water supply system, so that the purpose of simulation training can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance electrician training, in particular to an intelligent water supply simulation device. Background Art

[0002] The intelligent water supply system has stable performance and good effect, and is favored by many domestic heating companies. However, once the system fails, maintenance personnel are required to repair it quickly, which puts a higher demand on the skill level of maintenance personnel. Maintenance personnel can only follow experienced masters to carry out maintenance learning when there is a problem with the water supply system. It does not take advantage of the improvement of maintenance personnel's level and the limited training time. In order to enhance maintenance personnel's understanding of the intelligent water supply system, this device is specially made. Utility Model Content

[0003] The utility model aims to solve the problem that the training time of maintenance personnel of the intelligent water supply system is limited, which is not conducive to the improvement of the maintenance personnel's level. It thus provides an intelligent water supply simulation device that can perform simulated troubleshooting at any time. By artificially designing faults, learners can have a comprehensive understanding of the intelligent water supply system, thereby achieving the purpose of simulation training.

[0004] In order to achieve the above-mentioned utility model purpose, the utility model provides an intelligent water supply simulation device, including a frequency converter, a PLC, a motor, a contactor KM, a digital display, a trigger, a relay, a thermistor, and a transmitter. The PLC is connected to the button, the digital display, the frequency converter, the relay, and the trigger respectively, and the DC power supply is connected to the trigger, the PLC, the transmitter, and the relay; the digital display is connected to the PT100 thermistor through the transmitter; the frequency converter main circuit is connected to the contactor KM and the motor; the relay is connected to the contactor;

[0005] The three-phase power supply is connected to the upper side of the three-phase main contact of the contactor KM through the 3P circuit breaker QF1, the lower side of the three-phase main contact of the contactor KM is connected to the three-phase power supply terminal of the inverter, and the three-phase load terminal of the inverter is connected to the motor;

[0006] The I0.0 terminal of the PLC is connected to the start button. When the start button is pressed, the start button is connected to the PLC input point I0.0, and is connected to the relay KA1 through the output point Q0.0 after programming. The relay KA1 coil is energized, and the normally open auxiliary contact of KA1 is turned on. The relay KA1 is connected in series with the contactor KM, and the contactor KM is energized, and the inverter is powered on; the I0.1 terminal of the PLC is connected to the stop button. When the stop button is pressed, the stop button is connected to the input of the PLC input point I0.1, and the relay KA1 is de-energized through the PLC program, and the water supply system stops running;

[0007] The A1.0 and M terminals of the PLC are connected to the trigger, and the AQ.0 and M terminals are connected to the 3 and 4 terminals of the inverter. The trigger simulates the water consumption and adjusts the input of the PLC analog quantity. According to the PLC program setting, the analog quantity signal is output to the 3 and 4 terminals of the inverter through AQ.0; the Q0.4 and 2L terminals of the PLC are connected to the 5 and 9 terminals of the inverter. The PLC sends the inverter switch quantity signal to the 5 and 9 terminals of the inverter through the Q0.4 and 2L terminals. The inverter receives the start signal and then starts according to the start mode set by the inverter. After the start is completed, it runs according to the frequency set by the PLC program;

[0008] The thermistor is connected to the transmitter and the digital display. The thermistor converts the temperature signal into a resistance signal, and the resistance signal is converted into an analog voltage signal through the transmitter and sent to the digital display. The digital display displays the actual temperature. The upper and lower limits are set through the parameter setting of the digital display. The upper limit output contact AH and the lower limit output contact AL of the digital display are connected to the input terminals I0.2 and I0.3 of the Siemens PLC. Through PLC programming, the relay KA2 is automatically started or stopped to start or stop heating.

[0009] Furthermore, it also includes a display screen, which is connected to the PLC and the DC power supply.

[0010] The utility model intelligent water supply simulation device is simple and light, easy to move and carry, and can meet the needs of personnel training anytime and anywhere. With this device, the training of maintenance personnel is no longer restricted by the venue, which greatly improves the training efficiency and strengthens the training effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the main circuit diagram of the electrical schematic diagram of the utility model;

[0012] Figure 2 This is a schematic diagram of the electrical schematic control circuit of the utility model. DETAILED DESCRIPTION

[0013] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of an intelligent water supply simulation device of the utility model in conjunction with the accompanying drawings.

[0014] The intelligent water supply simulation device includes a frequency converter, a PLC, a motor, a contactor KM, a digital display, a trigger, a relay, a thermistor, and a transmitter.

[0015] The device uses Siemens PLCS7-200SMART controller as the main control element. This element has stable performance, low cost, simple programming and easy operation, simple maintenance and easy learning, and is particularly suitable for this simple program control. Thermistor is used as the temperature measuring element, which is a compression spring type temperature sensing element with good vibration resistance, high temperature measurement accuracy, high mechanical strength, and good high temperature and pressure resistance. The use of inverter to control and protect the motor can better play the performance of the motor, protect the safe and reliable operation of the motor, and improve the utilization rate of electric energy. The CH6 series digital display is used to display the target temperature and actual temperature. This element cooperates with sensors and transmitters output by various simulators to complete the measurement, conversion, display and control of physical quantities such as temperature, pressure, liquid level, and composition. It is suitable for standard voltage, current, thermal resistance, thermocouple and other signal types, with an error of less than 0.5% FS, and has adjustment and digital filtering functions, transmission output, and can output the measured and converted display value in the form of standard current and voltage for use by other equipment. The transmitter is used to convert the resistance signal of the thermistor into an analog voltage signal and supply it to the CH6 digital display. The transmitter is very important and is one of the key components to realize temperature display. The JS-020ISG trigger is used to simulate water consumption, and the trigger generates a 0-20MA current signal. The touch screen will demonstrate the user's current water flow and pipeline pressure values ​​through the PLC program.

[0016] The bottom plate of the simulation device is equipped with air switch QF1, air switch QF2, air switch QF3, relays, contactors, buttons, Siemens PLCS7-200SMART controller, inverter, touch screen, DC power supply, CH6 series digital display, PT100 thermistor, transmitter, trigger, indicator light, etc.

[0017] The Siemens PLC is connected to the button, digital display, frequency converter, relay, indicator light, trigger, and touch screen respectively; the DC power supply is connected to the trigger, Siemens PLC, touch screen, transmitter, relay, and indicator light; the digital display is connected to the PT100 thermistor through the transmitter; the frequency converter main circuit is connected to the contactor and the motor; the relay is connected to the contactor

[0018] Through the above connection, the temperature signal is converted into a resistance signal with PT100, and the resistance signal is converted into an analog voltage signal through the transmitter and sent to the CH6 digital display to display the actual temperature. Then, through the parameter setting of the digital display, the upper and lower limits are set, and the upper limit output contact AH and the lower limit output contact AL of the digital display are connected to the input point of the Siemens PLC. With reasonable programming, the PLC outputs to the relay KA2, and the start of the relay is used to simulate the automatic control of the temperature.

[0019] The digital display can not only identify temperature signals, but also liquid level signals, pressure signals, etc. If a liquid level meter is added to the plate, and then by reasonably setting parameters and programming, constant liquid level water supply can be achieved, which can expand functions and be practical.

[0020] Use JS-020ISG current signal trigger to simulate water flow, and send the 0-20MA current signal analog quantity generated by it to PLC. Through programming of PLC, the change of water flow can be automatically calculated, and the analog quantity signal and switch quantity signal output by PLC are transmitted to Siemens 440 series inverter. Through the change of inverter frequency, the motor speed can be changed according to the demand of water consumption. At the same time, the data of PLC is transmitted to the touch screen, and the current water supply flow value and pressure value are displayed on the touch screen.

[0021] Figure 1 This is the main circuit of the electrical schematic diagram of this device. The following is an analysis of the schematic diagram.

[0022] (1) Main circuit analysis

[0023] The three-phase 380V power supply is connected to the upper side of the three-phase main contacts of the contactor through the 3P circuit breaker QF1, the lower side of the three-phase main contacts of the contactor is connected to the three-phase power supply terminals (L1, L2, L3) of the inverter, and the three-phase load terminals (U, V, W) of the inverter are connected to the motor.

[0024] Figure 2 This is the electrical schematic control circuit of this device. The following is an analysis of the schematic.

[0025] (2) Analysis of control circuit

[0026] Speed ​​regulation function of the frequency converter: This function adopts analog signal input control. The A1.0 and M terminals of the PLC are connected to the trigger, and AQ.0 and M are connected to the 3 and 4 terminals of the frequency converter. The trigger simulates the 0-20MA analog current signal of water consumption adjustment and inputs the PLC analog quantity. According to the PLC program setting, the analog signal is output through AQ.0 to the 3 and 4 terminals of the frequency converter to adjust the speed of the motor.

[0027] The starting function of the inverter: This function adopts the external terminal control method. The Q0.4 and 2L terminals of the PLC are connected to the 5 and 9 terminals of the inverter. The PLC sends the inverter switch signal to the 5 and 9 terminals of the inverter through the Q0.4 and 2L terminals. The inverter receives the starting signal and then starts according to the starting method set by the inverter. After the startup is completed, it runs according to the frequency set by the PLC program.

[0028] Temperature display and control: Thermistor is connected to the transmitter and digital display. Through the cooperation of PT100 thermistor and transmitter, thermistor converts temperature signal into resistance signal, and the resistance signal is converted into analog voltage signal through transmitter and sent to digital display. The measured temperature is converted into analog voltage signal that can be recognized by CH6 series digital display and sent to digital display. The digital display will automatically change according to the change of temperature and display the actual temperature. Then, through the parameter setting of the digital display, the upper and lower limits of water temperature are set, and the upper limit output contact AH and lower limit output contact AL of the digital display are connected to the input terminals I0.2 and I0.3 of Siemens PLC. Through PLC programming, relay KA2 is automatically started or stopped to start or stop heating.

[0029] Start: When the start button is pressed, the start button is connected to the PLC input point I0.0, and then connected to the relay KA1 through the output point Q0.0 after programming. The relay KA1 coil is energized, the KA1 normally open auxiliary contact is turned on, the relay KA1 is connected in series with the contactor KM, the contactor KM is energized, the inverter is powered on, and the JS-020ISG trigger is used to simulate the water consumption to adjust the input PLC analog quantity. After programming through the PLC, the analog quantity signal is output to the inverter terminals 3 and 4 through AQ.0, and then the inverter switch quantity signal received from the PLC is received to the inverter terminals 5 and 9. The action signal is input into the PLC, and the PLC output is started through the internal program setting, the start relay KA1 then runs the main contactor to power the inverter, and the running indicator light is on. After receiving the start signal, the inverter starts the motor, and the motor speed is determined by the simulated water consumption. At the same time, the current water flow and pressure display are displayed on the touch screen.

[0030] Stop: Connect the stop button to the I0.1 terminal of the PLC. Press the stop button. The stop button is connected to the input of the PLC input point I0.1. The relay KA1 is de-energized through the PLC program, and the water supply system stops running.

Claims

1. An intelligent water supply simulation device, characterized in that: It includes frequency converter, PLC, motor, contactor KM, digital display, trigger, relay, thermistor and transmitter. PLC is connected with button, digital display, frequency converter, relay and trigger respectively. DC power supply is connected with trigger, PLC, transmitter and relay. Digital display is connected with PT100 thermistor through transmitter. Frequency converter main circuit is connected with contactor KM and motor. Relay is connected with contactor. The three-phase power supply is connected to the upper side of the three-phase main contact of the contactor KM through the 3P circuit breaker QF1, the lower side of the three-phase main contact of the contactor KM is connected to the three-phase power supply terminal of the inverter, and the three-phase load terminal of the inverter is connected to the motor; The I0.0 terminal of the PLC is connected to the start button. When the start button is pressed, the start button is connected to the PLC input point I0.0, and is connected to the relay KA1 through the output point Q0.0 after programming. The relay KA1 coil is energized, and the normally open auxiliary contact of KA1 is turned on. The relay KA1 is connected in series with the contactor KM, and the contactor KM is energized, and the inverter is powered on; the I0.1 terminal of the PLC is connected to the stop button. When the stop button is pressed, the stop button is connected to the input of the PLC input point I0.1, and the relay KA1 is de-energized through the PLC program, and the water supply system stops running; The A1.0 and M terminals of the PLC are connected to the trigger, and the AQ.0 and M terminals are connected to the 3 and 4 terminals of the inverter. The trigger simulates the water consumption and adjusts the input of the PLC analog quantity. According to the PLC program setting, the analog quantity signal is output to the 3 and 4 terminals of the inverter through AQ.0; the Q0.4 and 2L terminals of the PLC are connected to the 5 and 9 terminals of the inverter. The PLC sends the inverter switch quantity signal to the 5 and 9 terminals of the inverter through the Q0.4 and 2L terminals. The inverter receives the start signal and then starts according to the start mode set by the inverter. After the start is completed, it runs according to the frequency set by the PLC program; The thermistor is connected to the transmitter and the digital display. The thermistor converts the temperature signal into a resistance signal, and the resistance signal is converted into an analog voltage signal through the transmitter and sent to the digital display. The digital display displays the actual temperature. The upper and lower limits are set through the parameter setting of the digital display. The upper limit output contact AH and the lower limit output contact AL of the digital display are connected to the input terminals I0.2 and I0.3 of the Siemens PLC. Through PLC programming, the relay KA2 is automatically started or stopped to start or stop heating.

2. The intelligent water supply simulation device according to claim 1, characterized in that: It also includes a display screen, which is connected to the PLC and a DC power supply.

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