Automatic control device for electrodeionized water treatment system

Abstract

The present invention relates to an automatic control device for an electrodeionized water treatment system, comprising a PLC controller, a three-phase four-wire power supply, a main circuit breaker, and ten branch circuit breakers; one end of each of the ten branch circuit breakers is connected to the three-phase four-wire power supply via the main circuit breaker, and the other end is connected to each drive component to form multiple drive branches; each drive branch connecting the branch circuit breaker to the drive component is connected in series with a contactor or a frequency converter; the output terminals of the PLC controller are connected to multiple intermediate relays, which are respectively connected to the contactor or frequency converter to form multiple control loops; the input terminals of the PLC controller are respectively connected to the contactor, frequency converter, and input instrument; the automatic control device is also equipped with local, remote, and maintenance control circuits. Compared with the prior art, the present invention realizes automatic control of each drive component of the electrodeionized water treatment equipment, and simultaneously realizes local and remote switching control.

Description

Technical Field

[0001] The present invention relates to the field of automatic control of electrodeionized water treatment equipment, in particular to an automatic control device of an electrodeionized water treatment system. Background Art

[0002] A chemical industry requires high-quality pure water for the production of a certain product, requiring the use of electrodeionization (EDI) technology. Electrodeionization (EDI) water treatment equipment integrates various processing units with different functions throughout the entire process flow, including a reverse osmosis water storage area, a safety filtration area, an EDI area, and a concentrated water return area.

[0003] In order to realize automatic control of the above-mentioned electrodeionization water treatment equipment, it is necessary to design a corresponding automatic control device. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic control device for an electrodeionized water treatment system in order to overcome the defects of the prior art, such as a large number of driving components and inconvenient control.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The present invention provides an automatic control device for an electrodeionized water treatment system, which is used to automatically control various drive components of the electrodeionized water treatment equipment, and includes a PLC controller, a three-phase four-wire power supply, a main circuit breaker, and ten branch circuit breakers; one end of each of the ten branch circuit breakers is connected to the three-phase four-wire power supply through the main circuit breaker, and the other end is connected to each drive component to form a plurality of drive branches; each drive branch connecting the branch circuit breaker to the drive component is connected in series with a contactor or a frequency converter;

[0007] The output terminals of the PLC controller are respectively connected to a plurality of intermediate relays, and the plurality of intermediate relays are respectively connected to contactors or frequency converters to form a plurality of control loops; the input terminals of the PLC controller are respectively connected to the contactors, frequency converters and input instruments;

[0008] The automatic control device is also provided with local, remote and maintenance control circuits.

[0009] Preferably, the driving components include a first water feed pump, a second water feed pump, an electrodeionization (EDI) module, a 24V DC power supply, lighting and sockets, a three-phase backup power supply, a single-phase backup power supply, a water inlet valve, a water production valve, and a concentrated water valve.

[0010] Preferably, the drive branches to which the first water feed pump and the second water feed pump are connected are both connected in series with frequency converters; the drive branches to which the electrodeionization EDI module, water inlet valve, water production valve and concentrated water valve are connected are both connected in series with contactors.

[0011] Preferably, the digital input module of the PLC controller is connected to a contactor that reflects the start and stop status of the first water feed pump and the second water feed pump, and a frequency converter that reflects the opening and closing status of the water inlet valve, the water production valve and the concentrate valve; an intermediate relay for controlling the start and stop of the first water feed pump and the second water feed pump and the opening and closing of the water inlet valve, the water production valve and the concentrate valve is connected between the digital output module of the PLC controller and the contactor or the frequency converter;

[0012] The analog input module of the PLC controller is connected to an input instrument; the analog output module of the PLC controller is an analog output module for outputting a frequency control signal to a frequency converter.

[0013] Preferably, the automatic control device further includes an Ethernet switch and a touch screen; the PLC controller is connected to the touch screen via the Ethernet switch.

[0014] Preferably, the drive branches to which the first water feed pump, the second water feed pump, the electrodeionization EDI module, the water inlet valve, the water production valve and the concentrated water valve are connected are all connected with a switching switch for switching between local, remote and maintenance control circuits.

[0015] Preferably, the local control circuit is: a live wire, a local selection position of a transfer switch, a stop button, a start button, a normally closed contact of a fault indication relay, a coil of a start relay, and a neutral line are connected in series in sequence; wherein, the normally open contacts of the start relay are connected in parallel at both ends of the start button;

[0016] The remote control circuit is: a live wire, a transfer switch, a coil of an intermediate relay, and a neutral wire are connected in series in sequence; wherein, the terminal of the PLC controller is connected to the remote selection position of the transfer switch and the normally open contact of the intermediate relay, the normally open contact of the intermediate relay is connected to the terminal of the PLC and the normally closed contact of the fault indication relay, and the other end of the normally closed contact of the fault indication relay is connected to the coil of the starting relay.

[0017] Preferably, the electrical cabinet where the PLC controller is located is also provided with a frequency converter panel for adjusting the frequency of the frequency converter.

[0018] Preferably, the touch screen is a Siemens SMART LINE 700IE V3 touch screen, which is used to display instrument data input into the PLC controller.

[0019] Preferably, the PLC controller is Siemens S7-Smart SR40 PLC; the analog input module is EMAE08, and the analog output module is EM AQ04.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1) The present invention controls the on / off of the intermediate relay through a PLC controller, thereby affecting the on / off of the control branch, thereby realizing control of each drive branch, and realizing automatic control of each drive component of the electrodeionized water treatment equipment, greatly improving the treatment efficiency, and realizing independent control of each drive component, which is safe, reliable and highly operable;

[0022] 2) Each driving device in the present invention can be controlled locally or remotely from a control room. Remote control can be manual or automatic.

[0023] 3) The present invention connects a frequency converter in series with the drive branch connected to the water supply pump, and realizes flexible adjustment of the frequency of the water supply pump through the frequency converter panel;

[0024] 4) The present invention uses PLC to control the system, realizing the automatic operation of the process of the electrodeionized water treatment system. It can be manually controlled for each device individually, or the entire device can be automatically linked;

[0025] 5) The present invention is connected to a touch screen via an Ethernet switch, making operation very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a simplified circuit diagram of the first to seventh drive branches of the automatic control device of this embodiment;

[0027] Figure 2 This is a simplified circuit diagram of the eighth to tenth drive branches of the automatic control device of this embodiment;

[0028] Figure 3 This is the principle wiring diagram of the water feed pump 1, water feed pump 2 and electrodeionization EDI module in the driving branch of the automatic control device of this embodiment;

[0029] Figure 4 This is the principle wiring diagram of the 24V DC power supply, socket lighting, backup power supply and water inlet valve switch in the automatic control device drive branch of this embodiment;

[0030] Figure 5 This is the principle wiring diagram of the water production valve and the concentrated water valve in the driving branch of the automatic control device of this embodiment;

[0031] Figure 6This is the principle wiring diagram of the frequency converter 1 in the control loop of the automatic control device of this embodiment;

[0032] Figure 7 This is the principle wiring diagram of the frequency converter 2 in the control loop of the automatic control device of this embodiment;

[0033] Figure 8 This is a schematic wiring diagram of the DC power supply of the electrodeionization (EDI) module and the DC power supply module 1 in the control loop of the automatic control device of this embodiment;

[0034] Figure 9 This is the principle wiring diagram of the DC power supply module 2 in the control loop of the automatic control device of this embodiment;

[0035] Figure 10 This is the principle wiring diagram of the DC power supply module 3 in the control loop of the automatic control device of this embodiment;

[0036] Figure 11 This is a schematic wiring diagram of the DC power supply module 4 in the control loop of the automatic control device of this embodiment;

[0037] Figure 12 This is the principle wiring diagram of the water inlet valve opening in the automatic control device of this embodiment;

[0038] Figure 13 This is the principle wiring diagram of the water inlet valve in the automatic control device of this embodiment;

[0039] Figure 14 This is the wiring diagram of the water production valve opening principle in the automatic control device of this embodiment;

[0040] Figure 15 This is the wiring diagram of the water production valve closing principle in the automatic control device of this embodiment;

[0041] Figure 16 This is the wiring diagram of the concentrated water valve opening principle in the automatic control device of this embodiment;

[0042] Figure 17 This is the wiring diagram of the concentrated water valve closing principle in the automatic control device of this embodiment;

[0043] Figure 18 This is the principle wiring diagram of the power indicator light in the automatic control device of this embodiment;

[0044] Figure 19 This is a schematic diagram of the main circuits QF1 to QF5 of the PLC control cabinet in the automatic control device of this embodiment;

[0045] Figure 20 This is the principle and wiring diagram of the main circuits QF1 to QF5 of the PLC control cabinet in the automatic control device of this embodiment;

[0046] Figure 21This is a layout diagram of the PLC modules in the PLC control cabinet of the automatic control device in this embodiment;

[0047] Figure 22 This is the CPU wiring diagram in the PLC control cabinet of the automatic control device in this embodiment;

[0048] Figure 23 This is the wiring diagram of the CPU and digital input module in the PLC control cabinet of the automatic control device in this embodiment;

[0049] Figure 24 This is the wiring diagram of the analog input module in the PLC control cabinet of the automatic control device in this embodiment;

[0050] Figure 25 This is the wiring diagram of the analog input module in the PLC control cabinet of the automatic control device in this embodiment;

[0051] Figure 26 This is the wiring diagram of the analog output module in the PLC control cabinet of the automatic control device in this embodiment;

[0052] Figure 27 This is the basic process flow chart of the electrodeionization water treatment device;

[0053] Among them: AC380V / 50Hz is a three-phase four-wire power input, QF is the main circuit breaker, QF1~QF10 are branch circuit breakers; VDF1 and VDF2 are inverters, KA1~KA21 are intermediate relays, KM1~KM7 are contactors; SF1~SF9 are start buttons, SS1~SS9 are stop buttons;

[0054] PLC controller: I0.0~I2.7, I8.0~I8.7 are the first to thirty-second logic input terminals, Q0.0~Q1.7 are the first to sixteenth logic output terminals, AIW32~AIW62 are the first to sixteenth analog input terminals, and AQW64~AQW70 are the first to fourth analog output terminals. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0056] This embodiment provides an automatic control device for an electrodeionized water treatment system, which is used to automatically control various drive components of the electrodeionized water treatment equipment. The automatic control device includes a PLC controller, an Ethernet switch, a touch screen, and a power supply for the entire device. The PLC controller is connected to the touch screen via the Ethernet switch.

[0057] The automatic control device also includes a main circuit and a control circuit. The main circuit includes a three-phase four-wire power supply, a main circuit breaker, and multiple drive branches connected in sequence. Each drive branch is connected in series with a branch circuit breaker and a contactor or inverter, and the drive components are connected in series.

[0058] The control circuit includes multiple control branches and is connected to the power supply. Each control branch includes an intermediate relay. The intermediate relay controls the contactor or inverter.

[0059] The output terminals of the PLC controller are connected to the intermediate relay and 4-20mA output control signal respectively; the input terminals are connected to the contactor, frequency converter, on-site pH, flow, pressure and conductivity 4-20mA input respectively.

[0060] The drive branch to which the water pump P1 is connected is also connected in series with a first frequency converter via a small circuit breaker, and the output terminals of the PLC controller are respectively connected to the intermediate relay corresponding to the water pump P1;

[0061] The drive branch to which the water pump P2 is connected is also connected in series with a second frequency converter via a small circuit breaker, and the output terminals of the PLC controller are respectively connected to the intermediate relay corresponding to the water pump P2;

[0062] Other QF3~QF10 miniature circuit breakers respectively supply power to EDI DC power supply, lighting and sockets, backup three-phase power supply, backup single-phase power supply, water inlet valve, water production valve and concentrated water valve.

[0063] Among them, the drive branch connected to the water pump is also connected in series with a frequency converter, and the three positions of the control loop switch are local, remote and maintenance.

[0064] The water supply pump is divided into local control and remote control. The local control is on the electrical cabinet next to the equipment.

[0065] When the transfer switch is in the local position, the pump can be started and stopped by pressing the start / stop button, and the motor frequency can be adjusted. Whether controlled locally or remotely, the inverter is started by controlling the start relay, and the run indicator relay provides the run indication. The inverter's run signal controls the run indicator relay and run indicator light, and the run indicator relay then transmits the run signal to the PLC controller.

[0066] The inverter transmits the fault signal to the fault indication relay and indicator light, which then transmits the fault signal to the PLC controller. When the selector switch is in the remote position, the intermediate relay switches on and transmits the remote signal to the PLC. The PLC's digital output controls the output start relay, which in turn starts and stops the inverter, controlling the start and stop of the water supply pump motor. The inverter's frequency is set by the buttons on the frequency panel.

[0067] The control of the EDI module and the opening and closing of the water inlet valve, water production valve and concentrated water valve are all based on the same principles as above.

[0068] The PLC controller is an S7-200 Smart CPU SR40, equipped with input and output modules and a Siemens SMART LINE 700IE V touchscreen. Digital inputs, connected to intermediate relays, reflect the start / stop and opening / closing status of pumps and valves. Digital outputs, controlling intermediate relays, control contactors and inverters to achieve pump start / stop and valve opening / closing control. The analog input module receives 4-20mA signals from a pH meter, pressure, flow, frequency, current, and conductivity, and displays them on the industrial computer and touchscreen, where they can be used as control parameters. The analog output module outputs 4-20mA signals to control the inverter frequency.

[0069] Specific implementation:

[0070] like Figure 1 The seven miniature circuit breakers QF1~QF7 are used to supply power to water pump 1, water pump 2, EDI DC power supply, +24VDC power supply, lighting and socket, standby three-phase power supply and standby single-phase power supply respectively.

[0071] like Figure 2 As shown: three single-phase 2A circuit breakers QF8~QF10 supply power to the water inlet valve, water production valve and concentrated water valve respectively.

[0072] like Figure 3 As shown: two three-phase 32A miniature circuit breakers QF1~QF2 supply power to water pump 1 and water pump 2 respectively; a three-phase 50A miniature circuit breaker QF3 supplies power to the EDI DC power supply module; the three-phase power supply passes through the circuit breaker QF1 and is connected to the frequency converter VDF1, and the output end of the frequency converter VDF1 is then connected to the U1, V1, and W1 terminals, and from the terminals to the water pump 1; the three-phase power supply passes through the circuit breaker QF2 and is connected to the frequency converter VDF2, and the output end of the frequency converter VDF2 is then connected to the U2, V2, and W2 terminals, and from the terminals to the water pump 2; the three-phase power supply passes through the circuit breaker QF3 and is connected to the upper end of the contactor KM1, and the lower end of the contactor KM1 is connected to the input end of the EDI DC power supply module through fuses FU4~FU15, and the output line is connected to the EDI module through U3, V3, U4, V4, U5, V5, U6, and V6.

[0073] like Figure 4 As shown: two single-phase 10A miniature circuit breakers QF4 and QF5 respectively provide power for the +24VDC power supply, three-dimensional lighting in the electrical cabinet and sockets; a three-phase 10A miniature circuit breaker QF6 provides a backup three-phase power supply; a single-phase 6A miniature circuit breaker QF7 provides a backup single-phase power supply; a single-phase 2A miniature circuit breaker QF8 is connected to contactors KM2 and KM3 to supply power for opening and closing the water inlet valve respectively.

[0074] like Figure 5 As shown: the single-phase 2A miniature circuit breaker QF9 is connected to the contactors KM4 and KM5 respectively to supply power for opening and closing the water production valve; the single-phase 2A miniature circuit breaker QF10 is connected to the contactors KM6 and KM7 respectively to supply power for opening and closing the concentrated water valve.

[0075] like Figure 6 As shown: This figure shows the principle and wiring diagram of the main circuit and control circuit of the water pump 1 in the main circuit controlled by the inverter VDF1. Among them, the three-phase power supply L1, L2, and L3 is connected to the three-phase input terminal of the inverter VFD1 through the circuit breaker QF1, and the output terminals U1, V1, and W1 of the inverter VDF1 are connected to the water pump 1;

[0076] Connect the live wire L3 to the terminal FU1 fuse, and the other end of the fuse is connected to the switch of the electrical cabinet, the inverter's run normally open contact, the fault signal normally open contact, and the run indication relay KA2's normally closed contact;

[0077] Contacts 1 and 2 of the transfer switch are for local control, and contacts 3 and 4 are for remote control;

[0078] When the transfer switch is turned to terminals 1 and 2, the live wire L3 passes through terminal 31 of the stop button SS1 to terminal 32, and terminal 32 passes through the start button SF1 to the normally closed terminal 33 of the fault indication relay KA3, and the other end is connected to the coil 34 of the start relay KA1, and the other end of the coil is connected to the neutral line N.

[0079] When the transfer switch is set to the 1 / 2 local position and the start button SF1 is pressed, the start relay KA1 is energized and closed. The normally open terminal of the start relay KA1 is connected to the 28 terminal of the inverter VFD1 and the +24VDC power supply terminal. The start relay KA1 activates the inverter VFD1. The ABB inverter panel on the electrical cabinet can now adjust the frequency of the inverter VFD1. The inverter VFD1's frequency display output is a 4-20mA signal, which is connected to the analog input channel of the PLC via the AO1 and COM terminals. The PLC program processes the signal and displays it on the touch screen.

[0080] The inverter operation signal is connected to the No. 30 live wire and No. 37 wire through the R02B and R02C terminals on the inverter VFD1 to turn on the operation indication relay KA2 and the red operation display relay. There is a red light HR on the electrical cabinet to show that the inverter VFD1 is in the operating state; after the operation indication relay KA2 is energized, its normally open point is closed, and the operation digital signal is transmitted to the PLC by connecting to No. 100 and No. 102 wires. No. 102 wire is connected to terminal 8 of the terminal block; the motor running current is transmitted to the PLC through the AO2 and GND terminals of the inverter VFD1, and can be displayed on the touch screen after being processed and converted by the PLC.

[0081] When VFD1 stops, the normally closed contact of run indicator relay KA2 connects live wire 30 to the green light HG on the electrical cabinet. When VFD1 fails, its fault output signal connects live wire 30 and wire 38 via terminals R03B and R03C on VFD1, energizing fault indicator relay KA3 and simultaneously turning on the yellow fault indicator light HY. When fault indicator relay KA3 energizes, its normally open contact closes, transmitting the fault signal to the PLC via wires 100 and 103. Wire 103 is connected to terminal 9 on the terminal block.

[0082] When the transfer switch is turned to the 3rd and 4th remote terminals, the live wire is transmitted to line 35 through terminal 30, and connected to terminal 18 of the terminal block. Terminal 18 is then connected to the coil of the intermediate relay KA0, and the other end of the coil of the intermediate relay KA0 is connected to the neutral line; a normally open point of the intermediate relay KA0 connects lines 33 and 36, so that when lines 35 and 36 are connected, the starting relay KA1 can be energized to start the inverter VDF1.

[0083] When the PLC's digital output signal drives intermediate relay KA13, its normally open contact connects lines 35 and 36, closing starter relay KA1 and starting inverter VFD1. The other normally open contact of intermediate relay KA0 connects to lines 100 and 101, providing the PLC with a digital input signal indicating that the field switch is in the remote control position, allowing the PLC to start and stop the motor. Line 100 is connected to terminal 6 of the terminal block, and line 101 to terminal 7.

[0084] like Figure 7 This figure shows the principle and wiring diagram of the main circuit and control circuit of the inverter-controlled main circuit for water pump 2. The three-phase power supply L1, L2, and L3 is connected to the three-phase input terminals of the inverter VFD2 through circuit breaker QF2. The output terminals U2, V2, and W2 of the inverter VFD2 are connected to water pump 2.

[0085] The live wire L3 is connected to the terminal FU2 fuse, and the other end of the fuse is connected to the switch of the electrical cabinet, the normally open contact of the inverter, the normally open contact of the fault signal and the normally closed point of the operation indication relay KA6.

[0086] Contacts 1 and 2 of the transfer switch are for local control, while contacts 3 and 4 are for remote control. When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 41 of stop button SS2 to terminal 42. Terminal 42 passes through start button SF2 to the normally closed terminal (wire 43) of fault indication relay KA7. The other end is connected to the coil (wire 44) of start relay KA5, and the other end of the coil is connected to the neutral wire (N).

[0087] When the switch is set to the 1 / 2 local position and the start button SF2 is pressed, the start relay KA5 energizes. KA5's normally open terminal is connected to terminal 29 of the VFD and the +24VDC power supply. Activation of the start relay KA5 starts the VFD. At this point, the ABB VFD panel on the electrical cabinet can adjust the frequency of VFD2. The VFD2's frequency display output, a 4-20mA signal, is connected to the PLC's analog input channel via terminals AO1 and COM. The PLC program processes and displays it on the touch screen. The VFD's run signal is connected to live wires 40 and 47 via terminals R02B and R02C on VFD2, energizing the KA6 run indicator relay and the red run indicator light. A red HR light on the electrical cabinet indicates the VFD is running. When KA6 energizes, its normally open terminal closes, transmitting the digital run signal to the PLC via terminals 100 and 105. Terminal 105 is connected to terminal 8 on the terminal block.

[0088] The motor running current is transmitted to the PLC through the AO2 and GND terminals of the inverter VFD2, and can be displayed on the touch screen after being processed and converted by the PLC.

[0089] When inverter VFD2 stops, the normally closed contact of run indicator relay KA6 connects live wire 40 to the green light HG on the electrical cabinet. If the inverter fails, the inverter's fault output signal connects live wire 40 and wire 48 via terminals R03B and R03C on the inverter, activating fault indicator relay KA7 and simultaneously turning on the yellow fault indicator light HY. When KA7 is energized, its normally open contacts close, transmitting the fault signal to the PLC via wires 100 and 106. Wire 106 is connected to terminal 9 on the terminal block.

[0090] When the transfer switch is in the remote position 3 or 4, the live wire is transmitted through terminal 40 to line 45, which is then connected to terminal 18 on the terminal block. Terminal 18 is then connected to the coil of intermediate relay KA4, the other end of which is connected to the neutral wire. One normally open terminal of intermediate relay KA4 connects lines 46 and 43. This allows lines 45 and 46 to energize start relay KA5, starting inverter VFD2. When the PLC's digital output signal drives intermediate relay KA14, the relay's normally open terminal connects lines 45 and 46, energizing start relay KA5 and starting inverter VFD2. The other normally open terminal of intermediate relay KA4 is connected to lines 100 and 104, providing a digital input signal to the PLC, indicating that the field switch is in the remote control position and enabling the PLC to start and stop the motor. Line 100 is connected to terminal 6 on the terminal block, and line 104 is connected to terminal 7 on the terminal block.

[0091] like Figure 8 As shown in the figure: Live wire L3 is connected to fuse FU3, and the other end of the fuse is connected to the normally open and normally closed auxiliary contacts of the transfer switch, contactor KM1, the normally open contact of KA9, and the normally closed contact of KA12. Contacts 1 and 2 of the transfer switch are for local control, and contacts 3 and 4 are for remote control.

[0092] When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 51 of stop button SS3 to terminal 52. Terminal 52 then passes through start button SF3 to terminal 53. Terminal 53 is connected to the normally open point of intermediate relay KA12 and then to terminal 54. Wire 54 is then connected to the coil of intermediate relay KA9, the other end of which is connected to the neutral line (N). The normally open point of KA9 is connected in parallel with the start button SF3, providing a self-locking function when the start button SF3 is pressed.

[0093] When intermediate relay KA9 energizes, its other normally open contact connects to the 220VAC coil of KM1 via live wire 50, with the other end of the coil connected to the neutral wire. After contactor KM1 energizes, its normally open contact connects to live wire 50 and the coil of intermediate relay KA10, closing it. After intermediate relay KA10 energizes, its normally open contact connects to wires 100 and 107, transmitting the run signal to the PLC. HR, the red run indicator, illuminates simultaneously when contactor KM1 activates. Once contactor KM1 activates, the three-phase main power is supplied to all EDI power modules via the fuse. At this point, contactor KM1's normally closed contact opens, disconnecting power to the stop indicator HG.

[0094] LS1, LS2, LS3, and LS4 are water shutoff switches connected in series. All of these switches must be closed, meaning there is water on the concentrated water inlet side of each EDI module. Only then will intermediate relay KA12 energize, its normally open point connecting to intermediate relay KA9 and powering the EDI module. Intermediate relay KA12's normally closed point opens, disconnecting the power to the water shutoff indicator.

[0095] Line numbers 1002, 1003, 1004, and 1005 are the fault signals of EDI module 1, EDI module 2, EDI module 3, and EDI module 4, respectively. When any one of the fault signals is connected, the live wire 50 is connected to the coil of the intermediate relay KA11, the intermediate relay KA11 is energized, the yellow fault light HY lights up, and its normally closed point disconnects the KA9 coil to disconnect the contactor KM1, stop supplying power, and protect the EDI module.

[0096] When the transfer switch is in the position of terminals 3 and 4, the live wire is connected to terminal 4 of the transfer switch via wire 50. Terminal 4 is then connected to the coil of intermediate relay KA8, with the other terminal of intermediate relay KA8 connected to the neutral wire. When intermediate relay KA8 is energized, its normally open contact connects wires 56 and 53. At this point, the other normally open contact of intermediate relay KA8 is connected to wires 100 and 116, providing a digital input signal to the PLC, indicating that the field switch has been set to the remote control position and that the PLC can control the opening and closing of the contactor. Wire 100 is connected to terminal 11 of the terminal block, and wire 116 is connected to terminal 15 of the terminal block.

[0097] Connect wires 1000 and 1001 from terminals 4 and 5 of DC power module 1 to terminals 8 and 7 of the display control instrument on the electrical cabinet panel. Connect terminals 1 and 3 to the 220VAC input. Connect terminals 9, 11, 15, and 16 to voltage signals V+ and V-, and current signals I+ and I-, respectively. Connect wires 61, 62, and 63 to terminals R2, S2, and T2, respectively. Connect IC+ to the positive terminal of U3 on EDI module 1, and ID- to the negative terminal of V3.

[0098] like Figure 9 This figure shows the wiring diagram for DC power module 2. Connect wires 1003 and 1004 from terminals 4 and 5 of DC power module DC2 to terminals 8 and 7 of the display control instrument on the electrical cabinet panel. Terminals 1 and 3 connect to the 220VAC input. Terminals 9, 11, 15, and 16 connect to voltage signals V+ and V-, and current signals I+ and I-, respectively. Wires 64, 65, and 66 connect to terminals R2, S2, and T2, respectively. Connect IC+ to the positive terminal of U4 on EDI module 2, and ID- to the negative terminal of V4.

[0099] like Figure 10This figure shows the wiring diagram for DC power module 3. Connect wires 1006 and 1007 from terminals 4 and 5 of DC power module 3's regulated inputs to terminals 8 and 7 of the display control instrument on the electrical cabinet panel. Terminals 1 and 3 connect to the 220VAC input. Terminals 9, 11, 15, and 16 connect to voltage signals V+ and V-, and current signals I+ and I-, respectively. Wires 67, 68, and 69 connect to terminals R2, S2, and T2, respectively. Connect IC+ to the positive terminal of U5 on EDI module 3, and ID- to the negative terminal of V5.

[0100] like Figure 11 This diagram shows the wiring diagram for DC power module 4. Connect wires 1009 and 1010 from terminals 4 and 5 of DC power module DC4 to terminals 8 and 7 of the display control instrument on the electrical cabinet panel. Terminals 1 and 3 connect to the 220VAC input. Terminals 9, 11, 15, and 16 connect to voltage signals V+ and V-, and current signals I+ and I-, respectively. Wires 290, 291, and 292 connect to terminals R2, S2, and T2, respectively. Connect IC+ to the positive terminal of U6 on EDI module 4, and ID- to the negative terminal of V6.

[0101] like Figure 12 This diagram shows the principle and wiring diagram for opening the water inlet valve. A single-phase 220VAC power supply is connected to lines 20 and 21 of contactor KM2 via a miniature circuit breaker QF8. The lower end of contactor KM2 is connected to terminals U7 and V7, which are then connected to the power supply for opening the water inlet valve. The opening of the water inlet valve is controlled by controlling the connection of contactor KM2.

[0102] Live wire L1 is connected to one end of the FU20 fuse. The other end of the fuse is connected to the transfer switch, the open and closed position wires of the water inlet valve, and the open point of the KA29 intermediate relay. When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 71 of the stop button SS4 to terminal 72. Terminal 72 then passes through the start button SF4 to terminal 73. Terminal 73 is connected to the normally closed point of the intermediate relay KA31, and the normally open points of KA29 and KA30. The normally closed point of KA31 prevents KA29 from energizing when the water inlet valve is fully opened, thereby preventing KM2 from energizing and preventing the water inlet valve from opening. It can also disconnect KA29's power supply when energized. The open point of KA29 ensures that KA29 will self-lock after energizing. The normally open point of KA30 ensures that the live wire can be connected remotely. Connect the other end of KA31's normally closed contact, wire 88, to the normally closed contact of KA33. The other end of KA33's normally closed contact is connected to the coil of KA29, and the other end of KA29's coil is connected to the neutral line N. KA33's normally closed contact is an interlocking point, ensuring that the water inlet valve cannot be opened while it is closed. When the start button SF4 is pressed, the KA29 intermediate relay energizes and locks, and one of its normally open contacts connects to contactor KM2. The water inlet valve is now open.

[0103] When the transfer switch is in the position of terminals 3 and 4, the live wire is connected to the transfer switch's terminal 4 via line 70. Terminal 4 is then connected to the coil of intermediate relay KA30, with the other end of the KA30 coil connected to the neutral wire. When KA30 is energized, its normally open contact connects lines 73 and 76, allowing the circuit to connect to KA29 after the PLC remote signal KA16 is activated. At this point, KA30's other normally open contact is connected to lines 100 and 117, providing a digital input signal to the PLC, indicating that the switch has been moved to the remote control position and allowing the PLC to control the opening and closing of the contactor. Line 100 is connected to terminal 9 of the terminal block, and line 117 is connected to terminal 12 of the terminal block. The PLC controls KA16 to energize, connecting its normally open contacts 75 and 76, energizing KA29, and finally KM2, which opens the water inlet valve.

[0104] When the water inlet valve is fully opened, intermediate relay KA31 is energized, simultaneously activating the green indicator light HG, indicating the valve is fully opened. One normally closed contact on KA31 cuts off power to KA29, disconnecting KM2 and de-energizing the water inlet valve. The other normally open contact is connected to terminals 9 and 10 on the terminal block, transmitting the signal to the PLC via lines 100 and 110.

[0105] When the water inlet valve is fully closed, relay KA32 is energized, simultaneously activating the red indicator light HR, indicating the valve is fully closed. One normally closed contact on KA32 disconnects power to KA33, disconnecting KM3 and shutting off power to the water inlet valve. The other normally open contact is connected to terminals 9 and 11 on the terminal block, transmitting the signal to the PLC via lines 100 and 111.

[0106] like Figure 13 This diagram shows the principle and wiring diagram for closing the water inlet valve. A single-phase 220VAC power supply is connected to lines 20 and 21 of the KM3 contactor via a miniature circuit breaker QF8. The lower end of KM3 is connected to terminals U8 and V8, which are then connected to the water inlet valve's closing power supply. The water inlet valve is closed by controlling the connection of KM3.

[0107] Live wire L1 is connected to one end of fuse FU21, and the other end of the fuse is connected to the open point of the transfer switch and intermediate relay KA33, respectively. When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 81 of stop button SS5 to terminal 82. Terminal 82 then passes through start button SF5 to terminal 83. Terminal 83 is connected to the normally closed point of intermediate relay KA32, and the normally open points of KA33 and KA34. The normally closed point of KA32 prevents KA33 from energizing when the water inlet valve is fully closed. This prevents KM3 from energizing when the water inlet valve is fully closed. It also disconnects KA33 from power when energized. The open point of KA33 ensures that KA33 self-locks after energizing. The normally open point of KA34 ensures that the live wire can be connected remotely. The other end of KA32's normally closed point, wire 89, is connected to the normally closed point of KA29. The other end of KA29's normally closed point is connected to the coil of KA33, and the other end of the coil of KA33 is connected to the neutral line N. The normally closed position of KA29 is an interlocking point, ensuring that when the water inlet valve is powered on, it cannot be powered off. When the start button SF5 is pressed, the KA33 intermediate relay is powered and self-locks, and one of its normally open positions connects to the KM3 contactor. The water inlet valve is powered off.

[0108] When the transfer switch is in the position of terminals 3 and 4, the live wire is connected to the transfer switch's terminal 4 via line 80. Terminal 4 is then connected to the coil of intermediate relay KA34, the other end of which is connected to the neutral line. When KA34 is energized, its normally open contact connects lines 83 and 86, allowing the circuit to connect to KA33 after the PLC remote signal KA17 is activated. At this point, KA34's other normally open contact is connected to lines 100 and 118, providing a digital input signal to the PLC, indicating that the switch has been moved to the remote control position and enabling the PLC to control the opening and closing of the contactor. Line 100 is connected to terminal 8 of the terminal block, and line 118 is connected to terminal 9 of the terminal block. The PLC controls KA17 to energize, connecting its normally open contacts 85 and 86, energizing KA33, and finally KM3, which in turn powers the water inlet valve to close.

[0109] like Figure 14 This diagram shows the principle and wiring diagram for opening the water production valve. A single-phase 220VAC power supply is connected to lines 22 and 23 of the KM4 contactor via a small circuit breaker QF9. The lower end of KM4 is connected to terminals U9 and V9, which are then connected to the water production valve's power supply. Controlling the connection of KM4 controls the opening of the water production valve.

[0110] Live wire L1 is connected to one end of the FU22 fuse. The other end of the fuse is connected to the transfer switch, the open and closed position wires of the water production valve, and the open point of the KA35 intermediate relay. When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 91 of the stop button SS6 to terminal 92. Terminal 92 then passes through the start button SF6 to terminal 93. Terminal 93 is connected to the normally closed point of the intermediate relay KA37 and the normally open points of KA35 and KA36. The normally closed point of KA37 prevents KA35 from energizing when the water production valve is fully opened. This prevents KM4 from energizing, preventing the water production valve from opening. It also disconnects KA35 from powering it when energized. The open point of KA35 ensures that KA35 will self-lock after energizing. The normally open point of KA36 ensures that the live wire can be connected remotely. Connect the other end of KA37's normally closed contact, wire 258, to the normally closed contact of KA39. The other end of KA39's normally closed contact is connected to the coil of KA35, and the other end of KA35's coil is connected to the neutral line N. KA39's normally closed contact is an interlocking point, ensuring that the water production valve cannot be powered when it is closed. When the start button SF6 is pressed, the KA35 intermediate relay energizes and locks, and one of its normally open contacts connects to the KM4 contactor. The water production valve is powered.

[0111] When the transfer switch is in the position of terminals 3 and 4, the live wire is connected to the transfer switch's terminal 4 via line 90. Terminal 4 is then connected to the coil of intermediate relay KA36, the other end of which is connected to the neutral wire. When KA36 is energized, its normally open contact connects lines 93 and 96, allowing the circuit to connect to KA35 after the PLC remote signal KA18 is activated. At this point, KA36's other normally open contact is connected to lines 100 and 119, providing a digital input signal to the PLC, indicating that the switch is in the remote control position and enabling the PLC to control the opening and closing of the contactor. Line 100 is connected to terminal 9 of the terminal block, and line 119 is connected to terminal 12 of the terminal block. The PLC controls KA18 to energize, connecting its normally open contacts 95 and 96, energizing KA35, and KM4, thus opening the water production valve.

[0112] When the water production valve is fully opened, the KA37 intermediate relay is energized, and the HG green indicator light turns on, indicating that the water inlet valve is fully opened. One normally closed contact on KA37 cuts off power to KA35, disconnecting KM4 and de-energizing the water inlet valve. The other normally open contact is connected to terminals 9 and 10 on the terminal block, transmitting information to the PLC via lines 100 and 112.

[0113] When the water valve is fully closed, the intermediate relay KA38 is energized, and the red indicator light HR turns on, indicating the valve is fully closed. One normally closed contact on KA38 cuts off power to KA39, disconnecting KM5 and shutting off power to the water valve. The other normally open contact is connected to terminals 9 and 11 on the terminal block, transmitting information to the PLC via lines 100 and 113.

[0114] like Figure 15 This diagram shows the principle and wiring diagram for the water production valve's closing function. A single-phase 220VAC power supply is connected to lines 22 and 23 of the KM5 contactor via a small circuit breaker (QF9). The lower end of KM5 is connected to terminals U10 and V10, which are then connected to the water production valve's closing power supply. The water production valve's closing function is controlled by controlling the connection of KM5.

[0115] Live wire L1 is connected to one end of the FU23 fuse, and the other end of the fuse is connected to the open point of the transfer switch and the KA39 intermediate relay, respectively. When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 251 of the stop button SS7 to terminal 252. Terminal 252 then passes through the start button SF7 to terminal 253. Terminal 253 is connected to the normally closed point of the intermediate relay KA38, and the normally open points of KA39 and KA40. The normally closed point of KA38 ensures that KA39 cannot be energized and closed when the water production valve is fully closed. This prevents KM5 from energizing and prevents the water production valve from being closed. It can also disconnect the power supply to KA39 when energized. The open point of KA39 ensures that KA39 will self-lock after energizing. The normally open point of KA40 ensures that the live wire can be connected remotely. Connect the other end of KA38's normally closed contact, wire 259, to the normally closed contact of KA35. Connect the other end of KA35's normally closed contact to the coil of KA39, and the other end of KA39's coil to the neutral line N. KA35's normally closed contact is an interlocking point, ensuring that the water inlet valve cannot be powered when it is open. When the start button SF7 is pressed, the KA39 intermediate relay energizes and self-locks, and one of its normally open contacts connects to contactor KM5. The water production valve is powered off.

[0116] When the transfer switch is in the position of terminals 3 and 4, the live wire is connected to the transfer switch's terminal 4 via line 250. Terminal 4 is then connected to the coil of intermediate relay KA40, the other end of which is connected to the neutral wire. When KA40 is energized, its normally open contact connects lines 253 and 256, allowing the circuit to connect to KA39 after the PLC remote signal KA19 is activated. At this point, KA40's other normally open contact is connected to lines 100 and 120, providing a digital input signal to the PLC, indicating that the switch is in the remote control position and enabling the PLC to control the opening and closing of the contactor. Line 100 is connected to terminal 8 of the terminal block, and line 120 is connected to terminal 9 of the terminal block. The PLC controls KA19 to energize, connecting its normally open contacts 255 and 256, energizing KA39, and KM5, which in turn powers the water production valve to close.

[0117] like Figure 16 This diagram shows the principle and wiring diagram for opening the brine valve. A single-phase 220VAC power supply is connected to lines 24 and 25 of the KM6 contactor via a small circuit breaker (QF10). The lower end of KM6 is connected to terminals U11 and V11, which are then connected to the brine valve opening power supply. Controlling the opening of KM6 controls the opening of the brine valve.

[0118] Live wire L1 is connected to one end of fuse FU24. The other end of the fuse is connected to the transfer switch, the open and closed position wires of the concentrate valve, and the open point of intermediate relay KA41. When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 261 of stop button SS8 to terminal 262. Terminal 262 then passes through start button SF8 to terminal 263. Terminal 263 is connected to the normally closed point of intermediate relay KA43 and the normally open points of KA41 and KA42. The normally closed point of KA43 prevents KA41 from energizing when the concentrate valve is fully open. This prevents KM6 from energizing, preventing the concentrate valve from opening. It also allows KA41 to be disconnected when energized. The open point of KA41 ensures that KA41 will self-lock after energizing. The normally open point of KA42 ensures that the live wire can be connected remotely. The other end of the normally closed contact of KA43, wire 264, is connected to the normally closed contact of KA45. The other end of the normally closed contact of KA45 is connected to the coil of KA41, and the other end of the coil of KA41 is connected to the neutral line N. The normally closed contact of KA45 is an interlocking point, ensuring that the concentrate valve cannot be energized when it is closed. When the start button SF8 is pressed, the intermediate relay KA41 is energized and locked, and one of its normally open contacts connects to the contactor KM6, allowing the concentrate valve to open.

[0119] When the transfer switch is in terminals 3 and 4, the live wire is connected to terminal 4 of the transfer switch via line 260. Terminal 4 is then connected to the coil of intermediate relay KA42, with the other end of the KA42 coil connected to the neutral wire. When KA42 is energized, its normally open contact connects lines 263 and 266, allowing the circuit to connect to KA41 after the PLC remote signal KA20 is activated. At this point, KA42's other normally open contact is connected to lines 100 and 121, providing a digital input signal to the PLC, indicating that the switch has been moved to the remote control position and allowing the PLC to control the opening and closing of the contactor. Line 100 is connected to terminal 9 of the terminal block, and line 121 is connected to terminal 12 of the terminal block. The PLC controls KA20 to energize, connecting its normally open contacts 266 and 267, energizing KA41, and KM6, thus opening the concentrated water valve.

[0120] When the concentrate valve is fully opened, relay KA43 is energized, simultaneously activating the green HG indicator light, indicating the valve is fully opened. One normally closed contact on KA43 disconnects power to KA41, disconnecting KM6 and de-energizing the concentrate valve. The other normally open contact is connected to terminals 9 and 10 on the terminal block, transmitting the information to the PLC via lines 100 and 114.

[0121] When the brine valve is fully closed, relay KA44 is energized, simultaneously activating the red indicator HR, indicating the valve is fully closed. One normally closed contact on KA44 disconnects power to KA45, disconnecting KM7 and shutting off power to the brine valve. The other normally open contact is connected to terminals 9 and 11 on the terminal block, transmitting information to the PLC via lines 100 and 115.

[0122] like Figure 17 This diagram shows the principle and wiring diagram for closing the brine valve. A single-phase 220VAC power supply is connected to lines 24 and 25 of contactor KM7 via a miniature circuit breaker QF10. The lower end of contactor KM7 is connected to terminals U12 and V12, which are then connected to the brine valve's closing power supply. The brine valve is closed by controlling the connection of contactor KM7.

[0123] Live wire L1 is connected to one end of the FU25 fuse, and the other end of the fuse is connected to the open point of the transfer switch and the KA45 intermediate relay, respectively. When the transfer switch is set to terminals 1 and 2, the live wire passes through terminal 281 of the stop button SS9 to terminal 282. Terminal 282 then passes through the start button SF9 to terminal 283. Terminal 283 is connected to the normally closed point of the intermediate relay KA44 and the normally open points of KA45 and KA46. The normally closed point of KA44 prevents KA45 from energizing when the concentrate valve is fully closed. This prevents KM7 from energizing, preventing the concentrate valve from energizing. It also disconnects KA45 from power even when energized. The open point of KA45 ensures that KA45 will self-lock after energizing. The normally open point of KA46 ensures that the live wire can be connected remotely. The other end of KA44's normally closed contact, wire 284, is connected to KA41's normally closed contact. The other end of KA41's normally closed contact is connected to KA45's coil, and the other end of KA45's coil is connected to neutral line N. KA41's normally closed contact is an interlocking point, ensuring that the concentrate valve cannot be closed while it is energized. When the start button SF9 is pressed, the intermediate relay KA45 energizes and self-locks, and one of its normally open contacts connects to contactor KM7. The concentrate valve is now energized.

[0124] When the transfer switch is in the position of terminals 3 and 4, the live wire is connected to the transfer switch's terminal 4 via line 280. Terminal 4 is then connected to the coil of intermediate relay KA46, with the other end of the KA46 coil connected to the neutral wire. When KA46 is energized, its normally open contact connects lines 283 and 287, allowing the circuit to connect to KA45 after the PLC remote signal KA21 is activated. At this point, KA46's other normally open contact is connected to lines 100 and 122, providing a digital input signal to the PLC, indicating that the switch has been moved to the remote control position and that the PLC can control the opening and closing of the contactor. Line 100 is connected to terminal 8 of the terminal block, and line 122 is connected to terminal 9 of the terminal block. The PLC controls KA21, energizing its normally open contacts 286 and 287, energizing KA45, connecting KM7, and energizing the concentrated water valve to close.

[0125] like Figure 18 Shown: This figure is the wiring diagram of the power indicator light.

[0126] like Figure 19 This figure is a simplified diagram of the main circuit of the PLC control cabinet. Five miniature circuit breakers QF1 to QF5 supply the PLC power supply, +24V power supply, lighting and sockets, backup three-phase power supply, and backup single-phase power supply respectively.

[0127] like Figure 20 This figure shows the main circuit wiring diagram of the PLC control cabinet. Five miniature circuit breakers QF1 to QF5 supply the PLC power supply, +24V power supply, lighting and sockets, backup three-phase power supply, and backup single-phase power supply, respectively.

[0128] like Figure 21 This figure shows the PLC layout. The PLC and touch screen are connected via Ethernet through an industrial switch. The IP address of the PLC is 192.168.2.1; the IP address of the touch screen is 192.168.2.2.

[0129] like Figure 22 Shown: This figure is the wiring diagram of CPU SR40.

[0130] I0.0 is connected to the remote signal of water feed pump 1; I0.1 is connected to the operation signal of water feed pump 1; I0.2 is connected to the fault signal of water feed pump 1; I0.3 is connected to the remote signal of water feed pump 2; I0.4 is connected to the operation signal of water feed pump 2; I0.5 is connected to the fault signal of water feed pump 2; I0.6 is connected to the DC power supply operation signal.

[0131] Q0.0 is connected to the start signal of water pump 1; Q0.1 is connected to the start signal of water pump 2; Q0.2 is connected to the DC power supply signal; Q0.3 is connected to the water inlet valve to open; Q0.4 is connected to the water inlet valve to close; Q0.5 is connected to the water production valve to open; Q0.6 is connected to the water production valve to close; Q0.7 is connected to the concentrated water valve to open.

[0132] like Figure 23 Shown: This figure is the wiring diagram of CPU SR40.

[0133] I0.7 is the DC power supply failure signal; I1.0 is the water presence signal; I1.1 is the water inlet valve fully open signal; I1.2 is the water inlet valve fully closed signal; I1.3 is the water production valve fully open signal; I1.4 is the water production valve fully closed signal; I1.5 is the concentrate valve fully open signal; I1.6 is the concentrate valve fully closed signal; I1.7 is the DC power supply remote signal; I2.0 is the water inlet valve open remote signal; I2.1 is the water inlet valve closed remote signal; I2.2 is the water production valve open remote signal; I2.3 is the water production valve closed remote signal; I2.4 is the concentrate valve open remote signal; I2.5 is the concentrate valve closed remote signal; I2.6 is the standby signal; I2.7 is the emergency stop signal; I8.0~I8.7 are standby signals.

[0134] Q1.0 is the concentrated water valve closing signal; Q1.1~Q1.7 are standby signals.

[0135] like Figure 24 This diagram shows the wiring diagram for the first analog input module. Channels 1 through 4 are connected to the frequency signal of feedwater pump 1, the current signal of feedwater pump 1, the frequency signal of feedwater pump 2, and the current signal of feedwater pump 2, respectively. The remaining four channels are for backup.

[0136] like Figure 25 This figure shows the wiring diagram of the second analog input module. Channels one to eight are connected to the inlet flow input signal, inlet pH signal input, inlet pressure input, EDI inlet flow input, product water flow input, concentrate flow input, product water conductivity input, and concentrate conductivity input, respectively.

[0137] like Figure 26 This figure shows the wiring diagram of the analog output module. Analog output channels 1 and 2 are the frequency reference signals for feedwater pumps 1 and 2, respectively, while channels 3 and 4 are standby channels.

[0138] Combine Figure 27 The process flow chart of the automatic control device of this embodiment is as follows:

[0139] (a) First, close the main circuit breaker QF of the electrical cabinet and PLC control cabinet. The control cabinet is powered on and the power indicator light is on.

[0140] (b) Close all circuit breakers in the cabinet; turn the transfer switch on the electrical cabinet to local, remote or maintenance; the PLC control cabinet automatically controls the electrodeionized water treatment equipment;

[0141] (c) Input the value to be worked on the control screen of the touch screen, select water pump 1 or water pump 2, select automatic mode, press the start button, and the equipment will run automatically;

[0142] (d) To stop the machine, press the stop button;

[0143] (e) In case of emergency, press the emergency stop button on the PLC control cabinet panel to stop all equipment;

[0144] (g) The touch screen HMI displays the operating status and operating parameters of each pump and valve, as well as process parameters, including pressure, pH, flow rate and conductivity.

[0145] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An automatic control device for an electrodeionized water treatment system, used for automatically controlling various driving components of an electrodeionized water treatment device, characterized in that: The device comprises a PLC controller, a three-phase four-wire power supply, a main circuit breaker, and ten sub-circuit breakers; one end of each of the ten sub-circuit breakers is connected to the three-phase four-wire power supply through the main circuit breaker, and the other end is connected to each drive component to form multiple drive branches; each drive branch connecting the sub-circuit breaker to the drive component is connected in series with a contactor or a frequency converter; The output terminals of the PLC controller are respectively connected to a plurality of intermediate relays, and the plurality of intermediate relays are respectively connected to contactors or frequency converters to form a plurality of control loops; the input terminals of the PLC controller are respectively connected to the contactors, frequency converters and input instruments; The automatic control device is also provided with local, remote and maintenance control circuits; The drive components include a first water feed pump, a second water feed pump, an electrodeionization (EDI) module, a 24V DC power supply, lighting and sockets, a three-phase backup power supply, a single-phase backup power supply, a water inlet valve, a water production valve, and a concentrated water valve; the drive branches to which the first water feed pump and the second water feed pump are connected are connected in series with a frequency converter; the drive branches to which the electrodeionization (EDI) module, the water inlet valve, the water production valve, and the concentrated water valve are connected are connected in series with a contactor; The drive branches to which the first water feed pump, the second water feed pump, the electrodeionization EDI module, the water inlet valve, the water production valve and the concentrated water valve are connected are all connected with a transfer switch for switching between local, remote and maintenance control circuits; The local control circuit is composed of: a live wire, a local selection position of a transfer switch, a stop button, a start button, a normally closed contact of a fault indication relay, a coil of a start relay, and a neutral wire connected in series in sequence; wherein, the normally open contacts of the start relay are connected in parallel at both ends of the start button; The remote control circuit is: a live wire, a transfer switch, a coil of an intermediate relay, and a neutral wire are connected in series in sequence; wherein, the terminal of the PLC controller is connected to the remote selection position of the transfer switch and the normally open contact of the intermediate relay, the normally open contact of the intermediate relay is connected to the terminal of the PLC and the normally closed contact of the fault indication relay, and the other end of the normally closed contact of the fault indication relay is connected to the coil of the starting relay.

2. The automatic control device of an electrodeionized water treatment system according to claim 1, characterized in that: The digital input module of the PLC controller is connected to a frequency converter that reflects the start and stop status of the first and second water supply pumps, and a contactor that reflects the opening and closing status of the water inlet valve, the water production valve, and the concentrated water valve; an intermediate relay for controlling the start and stop of the first and second water supply pumps and the opening and closing of the water inlet valve, the water production valve, and the concentrated water valve is connected between the digital output module of the PLC controller and the contactor or the frequency converter; The analog input module of the PLC controller is connected to an input instrument; the analog output module of the PLC controller is an analog output module for outputting a frequency control signal to a frequency converter.

3. The automatic control device of an electrodeionized water treatment system according to claim 1, characterized in that: The automatic control device further includes an Ethernet switch and a touch screen; the PLC controller is connected to the touch screen via the Ethernet switch.

4. The automatic control device of an electrodeionized water treatment system according to claim 1, characterized in that: The electrical cabinet where the PLC controller is located is also provided with a frequency converter panel for adjusting the frequency of the frequency converter.

5. The automatic control device for an electrodeionized water treatment system according to claim 3, characterized in that: The touch screen is a Siemens SMART LINE 700 IE V3 touch screen, which is used to display data input from instruments in the PLC controller.

6. The automatic control device of an electrodeionized water treatment system according to claim 2, characterized in that: The PLC controller is Siemens S7-Smart SR40 PLC; the analog input module is EM AE08, and the analog output module is EM AQ04.

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