A rectifier control device and method for an electric desalination system

Abstract

The application relates to a rectifying electric control device and method for an electric desalting system, which comprises a power supply, a device electric control loop, a rectifying controller module and an on-site manual controller module; the power supply is electrically connected with the device electric control loop, the rectifying controller module and the on-site manual controller module; wherein the device electric control loop comprises a device electric primary loop and a device electric secondary loop. The application has the beneficial effect that the EDI system can realize rapid emergency shutdown after receiving a system water interruption signal, avoids the occurrence of production accidents caused by the fact that the direct current cannot be cut off in the water interruption state, realizes long-term stability of water production resistivity of the system in the remote control state through the PID adjusting function of the PLC system, reduces the workload of the operation personnel and can realize unattended operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical water treatment electric desalination, more particularly, it relates to a rectifier electric control device and method for an electric desalination system. BACKGROUND

[0002] With the gradual popularization of chemical water treatment electric desalination (EDI) technology, the integration and automation of the EDI device are required more and more, in the current design, the current of the EDI rectifier controller is mainly adjusted manually by a panel, the current value of the rectifier module is displayed on the panel, and the purpose of adjusting the current size is achieved.

[0003] However, in the manual mode of the EDI device, the workload of the operator is large, and after realizing remote automation, unattended operation can be realized. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art, and provides a rectifier electric control device and method for an electric desalination system.

[0005] In a first aspect, a rectifier electric control device for an electric desalination system is provided, comprising:

[0006] A power supply, a device electrical control circuit, a rectifier controller module and a local manual controller module; the power supply is electrically connected with the device electrical control circuit, the rectifier controller module and the local manual controller module; wherein the device electrical control circuit comprises a device electrical primary circuit and a device electrical secondary circuit; the rectifier controller module comprises a first rectifier controller U1, a second rectifier controller U3 and a third rectifier controller U5; the local manual controller module comprises a first local manual controller U2, a second local manual controller U4 and a third local manual controller U6;

[0007] In the device electrical primary circuit, a primary circuit breaker Q1 and an AC contactor KM1 are arranged, which are used for on-off of the power supply of the rectifier controller module, and a power-on indicator lamp H1 is arranged between phases, which is used for indicating whether the rectifier controller module is in a power-on state;

[0008] In the electrical secondary circuit of the device, a secondary circuit breaker Q2 is arranged for switching the secondary circuit power on and off, a two-position knob S1 is arranged for switching the local or remote control, the normally open auxiliary contact of the two-position knob S1 is arranged for remote status indication, a first lighted button S2 is arranged for local panel control starting of the rectifier, a second lighted button S3 is arranged for local panel control stopping of the rectifier, a button S4 is arranged in series in the self-locking loop of the first lighted button S2, the second lighted button S3 and the button S4, and is arranged for resetting the rectifier alarm local panel control; the coil of a first intermediate relay K1 is connected in series with the normally open contact of the water cut-off flow switch; the coils of a second intermediate relay K2, a third intermediate relay K3 and a fourth intermediate relay K4 are connected in series with the alarm normally open contacts of a first rectification controller U1, a second rectification controller U3 and a third rectification controller U5 respectively, one of the normally open contacts of the second intermediate relay K2, the third intermediate relay K3 and the fourth intermediate relay K4 is arranged for self-locking, one of the normally open contacts is arranged in series in the circuit of a second indicator light D2, a third indicator light D3 and a fourth indicator light D4 for indication, and one of the normally open contacts is arranged for outputting a signal to a remote control system, and the other normally closed contact is arranged in series in the water cut-off shutdown port of the first rectification controller U1, the second rectification controller U3 and the third rectification controller U5.

[0009] As a preferred, the power supply of the first rectification controller U1, the second rectification controller U3 and the third rectification controller U5 is taken from the output side of an AC contactor KM1 respectively; the 9th and 10th terminals of a first terminal block JP1 of the first rectification controller U1, the second rectification controller U3 and the third rectification controller U5 are rectifier fault alarm output terminals, and the 1st and 2nd terminals are water cut-off shutdown input terminals; the 1st, 2nd, 3rd and 4th terminals of a second terminal block JP2 are signal conversion terminals of a first local manual controller U2, a second local manual controller U4 and a third local manual controller U6; a third terminal block JP3 is a power supply output terminal, and is connected to an EDI module through a cable;

[0010] The 1st and 2nd terminals of the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 are power supply terminals, the 3rd and 4th terminals are remote current setting terminals, and the 5th, 6th, 7th and 8th terminals are signal exchange terminals with the rectification controller.

[0011] As a preferred, the rectification electric control device reserves interface terminals for remote status monitoring and control.

[0012] As a preferred, the power supply is an AC 380V power supply.

[0013] In a second aspect, a rectification electric control method for an electric deionization system is provided, which is executed by the rectification electric control device for the electric deionization system according to any one of the first aspect, and comprises:

[0014] Step 1, system power on: close the primary circuit breaker Q1 and secondary circuit breaker Q2, at this time the power indicator H1 is lit, indicating that the power supply of the device has been powered on;

[0015] Step 2, system start: the two-position knob S1 is set to the local side, and the DC output of the rectifier is manually adjusted through the local manual controller; after debugging is completed, the two-position knob S1 is set to the remote control side, and the PLC system automatically adjusts the DC output of the rectifier according to the rectifier current given signal through the local manual controller;

[0016] Step 3, system shutdown: including protection shutdown, local shutdown and remote shutdown;

[0017] Step 3.1, protection shutdown: when the EDI water flow switch detects insufficient flow, the first intermediate relay K1 is powered on after water is cut off, the auxiliary contact is triggered to protect the rectifier, and the DC output is automatically cut off; the first indicator D1 of the device is lit to alarm; when any one of the three sets of rectifiers fails, the 9, 10 terminals of the first terminal block JP1 send out a short pulse signal, the second intermediate relay K2, the third intermediate relay K3 or the fourth intermediate relay K4 is powered on and self-locked, and the second indicator D2, the third indicator D3 or the fourth indicator D4 is lit; at this time, the PLC system receives the rectifier fault signal and triggers the shutdown sequence control, the remote side circuit loses power, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the second lighted button S3 is lit, the rectifier loses power, and the system is shut down;

[0018] Step 3.2, when the second lighted button S3 is pressed while the two-position knob S1 is in the local side, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the indicator of the second lighted button S3 is lit, the rectifier loses power, and the system is shut down;

[0019] Step 3.3, remote shutdown: when the operator triggers the shutdown instruction on the upper computer, the PLC system triggers the shutdown sequence control, the remote side circuit loses power, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the indicator of the second lighted button S3 is lit, the rectifier loses power, and the system is shut down.

[0020] As preferred, step 2 comprises:

[0021] Step 2.1, manual start: the two-position knob S1 is turned to the local side, at this time the secondary circuit local side circuit is connected, the first lighted button S2 is pressed, the AC contactor KM1 coil is energized and attracted, the AC contactor KM1 main contact in the primary circuit is closed, the auxiliary contact is closed to self-lock the secondary circuit, the primary circuit is powered, the first lighted button S2 is lighted, the rectifier starts output after judging that the system is in the non-water interruption state, the third terminal block JP3 terminal outputs the default DC current, the EDI module is driven to produce water, and the water production resistivity is detected by the resistivity meter on the EDI system water production pipeline to realize local and remote display; the running and debugging personnel judge whether the water resistivity meets the requirements through the resistivity meter, if not, the size of the rectifier DC output is manually adjusted through the up and down arrow buttons on the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 panel, so that the EDI system water production resistivity can meet the standard;

[0022] Step 2.2, remote start: after the system debugging is completed, the automatic operation mode is switched; the two-position knob S1 is turned to the remote control side, at this time the secondary circuit remote control side circuit is connected, the running personnel press the start button on the upper computer manual, the PLC system sends a remote start long pulse instruction to the 7 and 8 terminals of the X1 terminal row, the AC contactor KM1 coil is energized and attracted, the primary circuit is powered, the first lighted button S2 is lighted, the rectifier starts output after judging that the system is in the non-water interruption state, the third terminal block JP3 terminal outputs the default DC current, the EDI module is driven to produce water, and the water production resistivity is detected by the resistivity meter on the EDI system water production pipeline to realize local and remote display; the PLC system compares and calculates the 4-20mA signal sent from the local resistivity meter with the target resistivity value set in the PID regulator in advance, and sends a 4-20mA rectifier current given signal to the 3 and 4 terminal posts of the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 to adjust the size of the rectifier DC output in real time, so that the EDI water production resistivity is closer and closer to the initial target value in the PID regulator.

[0023] The beneficial effects of the present application are: the present application solves the requirement of EDI system remote unattended, can realize the rapid emergency shutdown of EDI system after receiving the system water interruption signal, avoids the occurrence of production accidents caused by the failure of DC current to be cut off in the water interruption state; in the remote control state, the long-term stability of the system water production resistivity is realized through the PID regulation function of the PLC system, the workload of the running personnel is reduced, and unattended operation can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an electrical control circuit diagram;

[0025] Figure 2 Circuit diagram for the first rectifier controller U1 and the first local manual controller U2;

[0026] Figure 3 Circuit diagram for the second rectifier controller U3 and the second local manual controller U4;

[0027] Figure 4 Circuit diagram for the third rectifier controller U5 and the third local manual controller U6;

[0028] Legend: primary circuit breaker Q1, secondary circuit breaker Q2, AC contactor KM1, two-position knob S1, first lighted button S2, second lighted button S3, button S4, first intermediate relay K1, second intermediate relay K2, third intermediate relay K3, fourth intermediate relay K4, first rectifier controller U1, second rectifier controller U3, third rectifier controller U5, first local manual controller U2, second local manual controller U4, third local manual controller U6, first indicator light D1, second indicator light D2, third indicator light D3, fourth indicator light D4, power-on indicator light H1, first terminal block JP1, second terminal block JP2, third terminal block JP3. DETAILED DESCRIPTION

[0029] The application will be further described below in connection with embodiments. The following description of embodiments is merely intended to help understand the application. It should be pointed out that for those skilled in the art, several modifications can be made to the application without departing from the principles of the application, and these modifications and improvements also fall within the scope of protection of the claims of the application.

[0030] Example 1:

[0031] A rectification electric control device for an electric desalination system, as shown in Figure 1 , comprising:

[0032] a power supply, a device electrical control circuit, a rectifier controller module, and a local manual controller module; the power supply is an AC 380V power supply, and the power supply is electrically connected with the device electrical control circuit, the rectifier controller module, and the local manual controller module; wherein the device electrical control circuit comprises a device electrical primary circuit and a device electrical secondary circuit; the rectifier controller module comprises a first rectifier controller U1, a second rectifier controller U3, and a third rectifier controller U5; the local manual controller module comprises a first local manual controller U2, a second local manual controller U4, and a third local manual controller U6;

[0033] In the primary circuit of the device, a primary circuit breaker Q1 and an AC contactor KM1 are arranged to turn on and off the power supply of the rectifier controller module, and a power-on indicator H1 is arranged between the phases to indicate whether the rectifier controller module is powered on or not.

[0034] In the secondary circuit of the device, a secondary circuit breaker Q2 is arranged to turn on and off the power supply of the secondary circuit, a two-position knob S1 is arranged to switch between local and remote control, the normally open auxiliary contact of which is used for remote status indication, a first lighted button S2 is arranged to locally control the start of the rectifier, a second lighted button S3 is arranged to locally control the stop of the rectifier, and a button S4 is arranged in series in the self-locking circuit of the first lighted button S2, the second lighted button S3, and the button S4, which is used for local control reset of the rectifier alarm; the coil of the first intermediate relay K1 is connected in series with the normally open contact of the water flow switch; the coils of the second intermediate relay K2, the third intermediate relay K3, and the fourth intermediate relay K4 are connected in series with the alarm normally open contacts of the first rectifier controller U1, the second rectifier controller U3, and the third rectifier controller U5, respectively; one of the normally open contacts of the second intermediate relay K2, the third intermediate relay K3, and the fourth intermediate relay K4 is used for self-locking, one is connected in series in the circuit of the second indicator D2, the third indicator D3, and the fourth indicator D4 for indication, and one is used to output a signal to the remote control system; the other normally closed contact is connected in series in the water shutdown port of the first rectifier controller U1, the second rectifier controller U3, and the third rectifier controller U5.

[0035] As shown in Figures 2-4 the power supply of the first rectifier controller U1, the second rectifier controller U3, and the third rectifier controller U5 is taken from the output side of the AC contactor KM1; the 9 and 10 terminals of the first terminal block JP1 of the first rectifier controller U1, the second rectifier controller U3, and the third rectifier controller U5 are the rectifier fault alarm output terminals, and the 1 and 2 terminals are the water shutdown input terminals; the 1, 2, 3, and 4 terminals of the second terminal block JP2 are the signal conversion terminals of the first local manual controller U2, the second local manual controller U4, and the third local manual controller U6; the third terminal block JP3 is a power supply output terminal connected to the EDI module through a cable;

[0036] The 1 and 2 terminals of the first local manual controller U2, the second local manual controller U4, and the third local manual controller U6 are power supply terminals, the 3 and 4 terminals are remote current setting terminals, and the 5, 6, 7, and 8 terminals are signal exchange terminals with the rectifier controller.

[0037] In addition, the rectifier control device reserves interface terminals for remote status monitoring and control.

[0038] The electrical control circuit in this embodiment includes the control of three sets of rectifier controllers, which can be adjusted according to specific conditions when the system needs more.

[0039] Embodiment 2:

[0040] A method for installing a rectifier electrical control device for an electric desalination system, comprising:

[0041] Step 1, install the rectifier electrical control device for the electric desalination system on the electric desalination carriage, and connect the power supply through the cable;

[0042] In step 1, whether the power supply for the electrical control device is normal is displayed on the device panel through the power-on indicator light H1, and the power supply is an AC 380V power supply;

[0043] Step 2, connect the #1 EDI module to the 1 and 2 terminals of the X3 terminal block through the cable, wherein the 1 terminal block is positive; connect the #2 EDI module to the 7 and 8 terminals of the X3 terminal block through the cable, wherein the 7 terminal block is positive; connect the #3 EDI module to the 13 and 14 terminals of the X3 terminal block through the cable, wherein the 13 terminal block is positive; connect the remaining signals of the X1 terminal block to the remote programmable controller (PLC) through the cable;

[0044] Step 3, connect the normally open contact of the EDI system's water inflow switch to the 9 and 10 terminals of the X1 terminal block;

[0045] Step 4, close the primary circuit breaker Q1, at this time the indicator light H1 is on, and the primary circuit is in the power-on state.

[0046] Step 5, close the secondary circuit breaker Q2, at this time the secondary circuit is in the power-on state.

[0047] Embodiment 3:

[0048] A method for rectifier electrical control for an electric desalination system, executed by a rectifier electrical control device for the electric desalination system, comprising:

[0049] Step 1, system power-on: close the primary circuit breaker Q1 and the secondary circuit breaker Q2, at this time the power-on indicator light H1 is on, indicating that the power supply of the device has been powered on and completed;

[0050] Step 2, system start: turn the two-position knob S1 to the local side, manually adjust the DC output size of the rectifier through the local manual controller; after debugging is completed, turn the two-position knob S1 to the remote control side, and the PLC system automatically adjusts the DC output size of the rectifier according to the rectifier current given signal through the local manual controller;

[0051] Step 2 includes:

[0052] Step 2.1, manual start: Turn the two-position knob S1 to the local side, at this time the secondary circuit local side circuit is connected, press the first lighted button S2, the AC contactor KM1 coil is energized and closed, the AC contactor KM1 main contact in the primary circuit is closed, the auxiliary contact is closed to lock the secondary circuit, the primary circuit is powered, the first lighted button S2 is lit, the rectifier starts output after judging that the system is in a non-water break state, the third terminal block JP3 terminal outputs the default DC current, drives the EDI module to produce water, and the water production resistivity is displayed locally and remotely after being detected by the resistivity meter on the EDI system water production pipeline; the operation and debugging personnel judge whether the water resistivity meets the requirements through the resistivity meter, if not, manually adjust the DC output of the rectifier through the up and down arrow buttons on the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 panel, so that the EDI system water production resistivity can meet the standard;

[0053] Step 2.2, remote start: After the system debugging is completed, switch to automatic operation mode; turn the two-position knob S1 to the remote control side, at this time the secondary circuit remote control side circuit is connected, the operator presses the start button on the upper computer, the PLC system sends a remote start long pulse command to terminals 7 and 8 of the X1 terminal row, the AC contactor KM1 coil is energized and closed, the primary circuit is powered, the first lighted button S2 is lit, the rectifier starts output after judging that the system is in a non-water break state, the third terminal block JP3 terminal outputs the default DC current, drives the EDI module to produce water, and the water production resistivity is displayed locally and remotely after being detected by the resistivity meter on the EDI system water production pipeline; the PLC system compares and calculates the 4-20mA signal sent from the local resistivity meter with the target resistivity value set in the PID regulator, and sends a 4-20mA rectifier current given signal to the 3 and 4 terminals of the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 to adjust the DC output of the rectifier in real time, so that the EDI water production resistivity is closer and closer to the initial target value in the PID regulator, achieving the purpose of automatic operation of the system.

[0054] Step 3, system shutdown: including protection shutdown, local shutdown and remote shutdown;

[0055] Step 3 includes:

[0056] Step 3.1, protection shutdown: when the EDI water flow switch detects insufficient flow, the first intermediate relay K1 is powered on after the water is cut off, the auxiliary contact is triggered to protect the rectifier, and the DC output is automatically cut off; the first indicator light D1 on the device is lit to alarm; when any one of the three sets of rectifiers fails, the 9 and 10 terminals of the first terminal block JP1 send out a short pulse signal, the second intermediate relay K2, the third intermediate relay K3 or the fourth intermediate relay K4 is powered on and self-locked, the second indicator light D2, the third indicator light D3 or the fourth indicator light D4 is lit, and the operator can determine which rectifier is faulty; at this time, the PLC system receives the rectifier failure signal and triggers the shutdown sequence control, the remote side circuit loses power, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the second lighted button S3 is lit, the rectifier loses power, and the system is shut down.

[0057] Step 3.2, when the two-position knob S1 is in the local side, the second lighted button S3 is pressed, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the second lighted button S3 is lit, the rectifier loses power, and the system is shut down.

[0058] Step 3.3, remote shutdown: when the operator triggers the shutdown instruction on the upper computer, the PLC system triggers the shutdown sequence control, the remote side circuit loses power, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the second lighted button S3 is lit, the rectifier loses power, and the system is shut down.

Claims

1. A rectifier control method for an electric desalination system, the method being performed by a rectifier control device for an electric desalination system, characterized by, The device comprises a power supply, a device electrical control circuit, a rectifier controller module and a local manual controller module; the power supply is electrically connected with the device electrical control circuit, the rectifier controller module and the local manual controller module; wherein the device electrical control circuit comprises a device electrical primary circuit and a device electrical secondary circuit; the rectifier controller module comprises a first rectifier controller U1, a second rectifier controller U3 and a third rectifier controller U5; the local manual controller module comprises a first local manual controller U2, a second local manual controller U4 and a third local manual controller U6; In the device electrical primary circuit, a primary circuit breaker Q1 and an alternating current contactor KM1 are arranged for on-off of the power supply of the rectifier controller module, and an on-off indicator lamp H1 is arranged between phases for indicating whether the rectifier controller module is in the on-off state; In the device electrical secondary circuit, a secondary circuit breaker Q2 is arranged for on-off of the secondary circuit power supply, a two-position knob S1 is arranged for switching between local control and remote control, the normally open auxiliary contact of the two-position knob S1 is used for remote state indication, a first lighted button S2 is arranged for local panel control start of the rectifier, a second lighted button S3 is arranged for local panel control stop of the rectifier, a button S4 is arranged in series in the self-locking loop of the first lighted button S2, the second lighted button S3 and the button S4, and is used for local panel control reset of the rectifier alarm; the coil of a first intermediate relay K1 is connected in series with the normally open contact of the water cut-off flow switch; the coils of a second intermediate relay K2, a third intermediate relay K3 and a fourth intermediate relay K4 are respectively connected in series with the alarm normally open contacts of the first rectifier controller U1, the second rectifier controller U3 and the third rectifier controller U5; one of the normally open contacts of the second intermediate relay K2, the third intermediate relay K3 and the fourth intermediate relay K4 is used for self-locking, one of the normally open contacts is connected in series in the circuit of a second indicator lamp D2, a third indicator lamp D3 and a fourth indicator lamp D4 for indication, and one of the normally open contacts is used for output of a signal to a remote control system, and the other normally closed contact is connected in series in the water cut-off stop port of the first rectifier controller U1, the second rectifier controller U3 and the third rectifier controller U5; The method comprises: Step 1, system power-on: the primary circuit breaker Q1 and the secondary circuit breaker Q2 are closed, at this time the on-off indicator lamp H1 is lighted, indicating that the power supply of the device has been powered on; Step 2, system start: the two-position knob S1 is turned to the local side, and the DC output of the rectifier is manually adjusted through the local manual controller; after the adjustment is completed, the two-position knob S1 is turned to the remote control side, and the PLC system automatically adjusts the DC output of the rectifier according to the rectifier current given signal through the local manual controller; Step 3, system shutdown: including protection shutdown, local shutdown and remote shutdown.

2. The rectifier control method for an electric desalination system according to claim 1, characterized in that, The power supply of the first rectifier controller U1, the second rectifier controller U3 and the third rectifier controller U5 is taken to the output side of the AC contactor KM1; the 9 and 10 terminals of the first terminal block JP1 of the first rectifier controller U1, the second rectifier controller U3 and the third rectifier controller U5 are rectifier fault alarm output terminals, and the 1 and 2 terminals are water cut-off input terminals; the 1, 2, 3 and 4 terminals of the second terminal block JP2 are signal conversion terminals of the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6; the third terminal block JP3 is a power supply output terminal and is connected to the EDI module through a cable; The 1 and 2 terminals of the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 are power supply terminals, the 3 and 4 terminals are remote current setting terminals, and the 5, 6, 7 and 8 terminals are signal exchange terminals of the rectifier controller.

3. The rectifier control method for an electric desalination system according to claim 2, characterized in that, The rectifier control device is provided with interface terminals for remote state monitoring and control.

4. The rectifier control method for an electric desalination system according to claim 3, characterized in that, The power supply is an AC 380V power supply.

5. The method of claim 1, wherein the method further comprises: Step 3 includes: Step 3.1, protection shutdown: when the EDI water inflow switch detects insufficient flow, the first intermediate relay K1 is powered on after water cut-off, the auxiliary contact is triggered to protect the rectifier, the DC output is automatically cut off, the first indicator light D1 on the device is turned on to alarm, when any one of the three sets of rectifiers fails, the 9 and 10 terminals of the first terminal block JP1 send out a short pulse signal, the second intermediate relay K2, the third intermediate relay K3 or the fourth intermediate relay K4 is powered on and self-locked, the second indicator light D2, the third indicator light D3 or the fourth indicator light D4 is turned on; at this time, the PLC system receives the rectifier fault signal and triggers the shutdown control, the remote side circuit loses power, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the second lighted button S3 is turned on, the rectifier loses power, and the system is shut down; Step 3.2, when the two-position knob S1 is at the local side, the second lighted button S3 is pressed, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the indicator light of the second lighted button S3 is turned on, the rectifier loses power, and the system is shut down; Step 3.3, remote shutdown: when the operator triggers the shutdown instruction on the upper computer, the PLC system triggers the shutdown control, the remote side circuit loses power, the AC contactor KM1 coil loses power, the main contact is opened, the primary circuit is disconnected, the indicator light of the second lighted button S3 is turned on, the rectifier loses power, and the system is shut down.

6. The method of claim 1, wherein the method further comprises: Step 2 includes: Step 2.1, manual start: the two-position rotary knob S1 is turned to the local side, at this time the secondary circuit local side circuit is connected, the first lighted button S2 is pressed, the AC contactor KM1 coil is energized, the AC contactor KM1 main contact in the primary circuit is closed, the auxiliary contact is closed to lock the secondary circuit, the primary circuit is powered, the first lighted button S2 indicator is lit, the rectifier starts output after judging that the system is in a non-water break state, the third terminal block JP3 terminal outputs the default DC current, the EDI module drives water production, and the water production resistivity is displayed locally and remotely after being detected by the resistivity meter on the EDI system water production pipeline; the operation and debugging personnel judge whether the water resistivity meets the requirements through the resistivity meter, if not, the size of the rectifier DC output is manually adjusted through the up and down arrow buttons on the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 panel, so that the EDI system water production resistivity can meet the standard; Step 2.2, remote start: after the system debugging is completed, the automatic operation mode is switched; the two-position rotary knob S1 is turned to the remote control side, at this time the secondary circuit remote control side circuit is connected, the operator presses the start button on the upper computer, the PLC system sends a remote start long pulse command to terminals 7 and 8 of the X1 terminal row, the AC contactor KM1 coil is energized, the primary circuit is powered, the first lighted button S2 indicator is lit, the rectifier starts output after judging that the system is in a non-water break state, the third terminal block JP3 terminal outputs the default DC current, the EDI module drives water production, and the water production resistivity is displayed locally and remotely after being detected by the resistivity meter on the EDI system water production pipeline; the PLC system compares and calculates the 4-20mA signal sent by the local resistivity meter with the target resistivity value set in the PID regulator in advance, and sends a 4-20mA rectifier current given signal to the 3 and 4 terminals of the first local manual controller U2, the second local manual controller U4 and the third local manual controller U6 to adjust the size of the rectifier DC output in real time, so that the EDI water production resistivity is closer and closer to the initial target value in the PID regulator.

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