CN116032019B - A rectifier control device and method for an electrostatic desalination system - Google Patents

Abstract

This invention relates to a rectifier control device and method for an electrostatic desalination (EDI) system, comprising: a power supply, an electrical control circuit, a rectifier controller module, and a local manual controller module; the power supply is electrically connected to the electrical control circuit, the rectifier controller module, and the local manual controller module; wherein the electrical control circuit includes a primary electrical circuit and a secondary electrical circuit. The advantages of this invention are: it enables rapid emergency shutdown of the EDI system upon receiving a water inlet interruption signal, preventing production accidents caused by the inability to cut off DC current during water interruption; in remote control mode, the PID control function of the PLC system achieves long-term stability of the system's water resistivity, reducing the workload of operators and enabling unattended operation.

Description

Rectifying electric control device and method for electric desalting system

Technical Field

The invention relates to the technical field of chemical water treatment electric desalting, in particular to a rectifying electric control device and a rectifying electric control method for an electric desalting system.

Background

Along with the gradual popularization of the chemical water treatment Electric Desalting (EDI) technology, the requirements on the integration level and the automation degree of an EDI device are higher and higher, in the current design, the current of an EDI rectification controller is manually adjusted to be the main current by adopting a disk cabinet, and the current value of a rectification module is displayed on a local panel, so that the purpose of adjusting the current is achieved.

However, in the case of the manual mode of the EDI device, the workload of the operator is large, and the unattended operation can be realized after the remote automation is realized.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a rectifying electric control device and a rectifying electric control method for an electric desalting system.

In a first aspect, there is provided a rectifying electronic control device for an electrical desalination system, comprising:

The power supply is electrically connected with the device electric control loop, the rectification 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 rectification controller module comprises a first rectification controller U1, a second rectification controller U3 and a third rectification controller U5, and the on-site manual controller module comprises a first on-site manual controller U2, a second on-site manual controller U4 and a third on-site manual controller U6;

In the electric primary loop of the device, a primary loop breaker Q1 and an alternating current contactor KM1 are arranged for supplying power to the on-off rectification controller module, and an energizing indicator lamp H1 is arranged at the phase to indicate whether the rectification controller module is in an energizing state or not;

in the electric secondary circuit of the device, a secondary circuit breaker Q2 is arranged for switching on/off a secondary circuit power supply, a two-position knob S1 is used for switching on-site or remote control, a normally open auxiliary contact is used for remote state indication, a first button S2 with a lamp is used for on-site disk control starting a rectifier, a second button S3 with a lamp is used for on-site disk control stopping the rectifier, a button S4 is connected in series with a self-locking loop of the first button S2 with the lamp, the second button S3 with the lamp and the button S4 for on-site disk control resetting of the rectifier, a coil of a first intermediate relay K1 is connected with a normally open contact of a water cut-off flow switch in series, coils of a second intermediate relay K2, a third intermediate relay K3 and a fourth intermediate relay K4 are connected in series with alarm normally open contacts of a first rectifying controller U1, a second rectifying controller U3 and a third rectifying controller U5 respectively, one normally open contact of the second intermediate relay K2, the third intermediate relay K3 and the fourth intermediate relay K4 is used for self-locking, one normally open contact of the first intermediate relay K2, the third intermediate relay K3 and the fourth intermediate relay K4 is connected with the normally open contact in series with the second indicating lamp D3 and the third intermediate relay D4 for switching off the normally open contact, the normally open contact is connected with the normally open contact of the third intermediate relay K4, and the normally open contact is used for controlling the output of the normally open contact of the first intermediate relay and the third relay and the normally open contact.

Preferably, the power supplies of the first rectifying controller U1, the second rectifying controller U3 and the third rectifying controller U5 are respectively taken to the output side of the alternating current contactor KM1, the 9 terminal and the 10 terminal of a first wiring terminal board JP1 of the first rectifying controller U1, the second rectifying controller U3 and the third rectifying controller U5 are rectifier fault alarm output terminals, and the 1 terminal and the 2 terminal are water-break shutdown input terminals;

the terminals 1 and 2 of the first on-site manual controller U2, the second on-site manual controller U4 and the third on-site manual controller U6 are power supply terminals, the terminals 3 and 4 are remote current given terminals, and the terminals 5, 6, 7 and 8 are signal exchange terminals with the rectification controller.

Preferably, the rectifying electronic control device is provided with an interface terminal for remote state monitoring and control.

Preferably, the power supply is an Alternating Current (AC) 380V power supply.

In a second aspect, there is provided a rectifying electronic control method for an electric salt removal system, performed by the rectifying electronic control device for an electric salt removal system of any one of the first aspects, comprising:

Step 1, powering up a system, namely closing a primary circuit breaker Q1 and a secondary circuit breaker Q2, and turning on an energizing indicator lamp H1 at the moment to indicate that the power supply of the device is powered up;

step 2, starting the system, namely beating the two-position knob S1 to the local side, and manually adjusting the direct current output of the rectifier through the local manual controller, wherein after debugging is finished, beating the two-position knob S1 to the remote control side, and automatically adjusting the direct current output of the rectifier through the local manual controller by the PLC system according to a current given signal of the rectifier;

step 3, system shutdown, including protection shutdown, on-site shutdown and remote shutdown;

Step 3.1, protection stopping, namely when an EDI water inflow switch detects that the flow is insufficient and water is cut off, a first intermediate relay K1 is powered on, an auxiliary contact starts rectifier self-protection and automatically cuts off direct current output, a first indicator lamp D1 is arranged on the device to be lightened and give an alarm, when any 1 set of 3 sets of rectifiers breaks down, the 9 terminals and 10 terminals of a first wiring terminal board JP1 send out a short pulse signal, a second intermediate relay K2, a third intermediate relay K3 or a fourth intermediate relay K4 are powered on and self-locked, the second indicator lamp D2, the third indicator lamp D3 or the fourth indicator lamp D4 are lightened, at the moment, a PLC system triggers stopping sequence control after receiving a rectifier fault signal, a remote side loop is in power failure, an alternating current contactor KM1 coil is in power failure, a main contact is disconnected, a primary loop is disconnected, a second lamp-carrying button S3 is lightened, and the rectifier is in power failure;

Step 3.2, when the two-position knob S1 is positioned on the on-site side, when the second button S3 with the lamp is pressed, the coil of the alternating current contactor KM1 is powered off, the main contact is disconnected, the primary loop is disconnected, the indicator lamp of the second button S3 with the lamp is lighted, the rectifier is powered off, and the system is stopped;

And 3.3, remotely stopping, namely triggering shutdown sequence control by the PLC system after a soft manual operation triggering stopping instruction is performed on an upper computer by an operator, powering down a remote side loop, powering down an alternating current contactor KM1 coil, disconnecting a main contact, disconnecting a primary loop, turning on an indicator lamp of a second button S3 with a lamp, powering down a rectifier and stopping the system.

Preferably, step 2 includes:

Step 2.1, manually starting, namely, beating a two-position knob S1 to the on-site side, at the moment, the on-site side loop of a secondary loop is on, pressing a first button S2 with a lamp, conducting electricity and closing by an alternating current contactor KM1 coil, closing a main contact of the alternating current contactor KM1 in a primary loop, closing an auxiliary contact to lock the secondary loop, conducting electricity on the primary loop, lighting an indicator lamp of the first button S2 with the lamp, starting output after judging that the system is in a non-water-break state by a rectifier, outputting a default direct current by a third wiring terminal board JP3 terminal, driving an EDI module to produce water, and detecting the resistivity of the produced water by a resistivity meter on a water production pipeline of the EDI system to realize on-site and remote display;

Step 2.2, remote starting, namely switching to an automatic operation mode after system debugging is finished, beating a two-position knob S1 to a remote control side, at the moment, beating a secondary circuit remote control side loop to be on, manually pressing a starting button by an operator at an upper computer, namely sending a remote starting long pulse instruction to terminals 7 and 8 of an X1 terminal row by a PLC system, powering on an alternating current contactor KM1 coil, powering on a primary loop, lighting an indicator lamp of a first lamp button S2, starting and outputting a rectifier after judging that the system is in a non-water-cutting state, outputting a default direct current by a terminal JP3 of a third wiring terminal board, driving an EDI module to produce water, realizing on-site and remote display of the produced water resistivity through a resistivity meter on a water production pipeline of the EDI system, and sending a 4-20mA signal by the PLC system to a target value of the first on-site manual controller U2, a second on-site manual controller U4 and a target value of the third EDI controller U6 after comparing and calculating the target resistivity value of the target resistivity value set in advance in the PID controller, and outputting the target value of the first on-site rectifier U4 mA controller to enable the current to be close to the initial resistor to be large.

The remote control system has the beneficial effects that the remote unattended requirement of the EDI system is solved, the rapid emergency stop of the EDI system after receiving the water inlet and water interruption signals of the system can be realized, the occurrence of production accidents caused by incapability of cutting off direct current in a water interruption state is avoided, the long-term stability of the water production resistivity of the system is realized through the PID regulation function of the PLC system in a remote control state, the workload of operators is reduced, and the unattended operation can be realized.

Drawings

FIG. 1 is a diagram of an electrical control loop;

FIG. 2 is a schematic circuit diagram of a first rectifier controller U1 and a first in-situ manual controller U2;

FIG. 3 is a schematic circuit diagram of a second rectifier controller U3 and a second in-situ manual controller U4;

FIG. 4 is a schematic circuit diagram of a third rectifier controller U5 and a third in-situ manual controller U6;

the reference numerals indicate that the primary circuit breaker Q1, the secondary circuit breaker Q2, the alternating-current contactor KM1, the two-position knob S1, the first button with lamp S2, the second button with lamp S3, the button S4, the first intermediate relay K1, the second intermediate relay K2, the third intermediate relay K3, the fourth intermediate relay K4, the first rectifying controller U1, the second rectifying controller U3, the third rectifying controller U5, the first on-site manual controller U2, the second on-site manual controller U4, the third on-site manual controller U6, the first indicator lamp D1, the second indicator lamp D2, the third indicator lamp D3, the fourth indicator lamp D4, the energizing indicator lamp H1, the first wiring terminal board JP1, the second wiring terminal board JP2 and the third wiring terminal board JP3.

Detailed Description

The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Example 1:

A rectifying electronic control device for an electrodeionization system, as shown in fig. 1, comprising:

The power supply is an Alternating Current (AC) 380V power supply, and the power supply is electrically connected with the device electric control loop, the rectification controller module and the local manual controller module, wherein the device electric control loop comprises a device electric primary loop and a device electric secondary loop, the rectification controller module comprises a first rectification controller U1, a second rectification controller U3 and a third rectification controller U5, and 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 electric primary loop of the device, a primary loop breaker Q1 and an alternating current contactor KM1 are arranged for supplying power to the on-off rectification controller module, and an energizing indicator lamp H1 is arranged at the phase to indicate whether the rectification controller module is in an energizing state or not;

In the electric secondary circuit of the device, a secondary circuit breaker Q2 is arranged for switching on/off a secondary circuit power supply, a two-position knob S1 is used for switching on-site or remote control, a normally open auxiliary contact is used for remote state indication, a first button S2 with a lamp is used for on-site disk control starting a rectifier, a second button S3 with a lamp is used for on-site disk control stopping the rectifier, a button S4 is connected in series with a self-locking loop of the first button S2 with the lamp, the second button S3 with the lamp and the button S4 for on-site disk control resetting of the rectifier, a coil of a first intermediate relay K1 is connected with a normally open contact of a water cut-off flow switch in series, coils of a second intermediate relay K2, a third intermediate relay K3 and a fourth intermediate relay K4 are connected in series with alarm normally open contacts of a first rectifying controller U1, a second rectifying controller U3 and a third rectifying controller U5 respectively, one of 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 normally open contact of the second intermediate relay K2, the third intermediate relay K3 and the fourth intermediate relay K4 is connected with a normally open contact in series with a normally closed end of the second rectifying controller U4, and the normally open contact is connected with the normally open contact of the first intermediate relay D3 and the third intermediate relay K4 to the normally open contact is used for controlling the output of the normally open contact of the first intermediate relay.

As shown in fig. 2-4, the power supplies of the first rectifying controller U1, the second rectifying controller U3 and the third rectifying controller U5 are respectively taken to the output side of the alternating current contactor KM1, the 9 terminal and 10 terminal of a first wiring terminal board JP1 of the first rectifying controller U1, the second rectifying controller U3 and the third rectifying controller U5 are rectifier fault alarm output terminals, the 1 terminal and 2 terminal are water-break shutdown input terminals, the 1 terminal, 2 terminal, 3 terminal and 4 terminal of a second wiring terminal board JP2 are signal conversion terminals of a first on-site manual controller U2, a second on-site manual controller U4 and a third on-site manual controller U6, and the third wiring terminal board JP3 is a power supply output terminal and is connected to an EDI module through a cable;

the terminals 1 and 2 of the first on-site manual controller U2, the second on-site manual controller U4 and the third on-site manual controller U6 are power supply terminals, the terminals 3 and 4 are remote current given terminals, and the terminals 5, 6, 7 and 8 are signal exchange terminals with the rectification controller.

In addition, the rectification electric control device is reserved with an interface terminal for remote state monitoring and control.

The electrical control loop in this embodiment comprises 3 sets of control of the rectifying controller, and can be adjusted according to the specific situation when the system needs more.

Example 2:

a method of installing a rectifying electronic control device for an electrodeionization system comprising:

Step 1, installing a rectifying electric control device for an electric desalting system on an electric desalting carriage, and accessing a power supply through a cable;

in the step 1, whether the power supply of the electric control device is normally displayed on the panel of the device through the power-on indicator lamp H1 is judged, and the power supply is an alternating current AC380V power supply;

Step 2, the #1EDI module is connected to the terminals 1 and 2 of the X3 terminal row through a cable, wherein the terminal 1 is the positive electrode, the #2EDI module is connected to the terminals 7 and 8 of the X3 terminal row through a cable, the terminal 7 is the positive electrode, the #3EDI module is connected to the terminals 13 and 14 of the X3 terminal row through a cable, the terminal 13 is the positive electrode, and the rest signals of the X1 terminal row are connected to a remote programmable controller (PLC) through cables respectively;

step3, normally open contacts of a water inflow flow switch of the EDI system are connected to terminals 9 and 10 of an X1 terminal row;

and 4, closing the primary circuit breaker Q1, and at the moment, turning on the indicator lamp H1, wherein the primary circuit is in an electrified state.

And 5, closing the secondary circuit breaker Q2, wherein the secondary circuit is in an electrified state.

Example 3:

A rectifying electronic control method for an electrodeionization system, performed by a rectifying electronic control device for an electrodeionization system, comprising:

Step 1, powering up a system, namely closing a primary circuit breaker Q1 and a secondary circuit breaker Q2, and turning on an energizing indicator lamp H1 at the moment to indicate that the power supply of the device is powered up;

step 2, starting the system, namely beating the two-position knob S1 to the local side, and manually adjusting the direct current output of the rectifier through the local manual controller, wherein after debugging is finished, beating the two-position knob S1 to the remote control side, and automatically adjusting the direct current output of the rectifier through the local manual controller by the PLC system according to a current given signal of the rectifier;

The step 2 comprises the following steps:

Step 2.1, manually starting, namely, beating a two-position knob S1 to the on-site side, at the moment, the on-site side loop of a secondary loop is on, pressing a first button S2 with a lamp, conducting electricity and closing by an alternating current contactor KM1 coil, closing a main contact of the alternating current contactor KM1 in a primary loop, closing an auxiliary contact to lock the secondary loop, conducting electricity on the primary loop, lighting an indicator lamp of the first button S2 with the lamp, starting output after judging that the system is in a non-water-break state by a rectifier, outputting a default direct current by a third wiring terminal board JP3 terminal, driving an EDI module to produce water, and detecting the resistivity of the produced water by a resistivity meter on a water production pipeline of the EDI system to realize on-site and remote display;

Step 2.2, remote starting, namely switching to an automatic operation mode after system debugging is finished, beating a two-position knob S1 to a remote control side, at the moment, beating a secondary circuit remote control side loop to be on, manually pressing a starting button by an operator at an upper computer, namely sending a remote starting long pulse instruction to terminals 7 and 8 of an X1 terminal row by a PLC system, powering on an alternating current contactor KM1 coil, powering on a primary loop, starting and outputting a first indicator lamp with a lamp button S2 after judging that the system is in a non-water-break state, outputting a default direct current by a rectifier after judging that the system is in a non-water-break state, driving an EDI module to produce water, realizing on-site and remote display of the water production resistivity through a resistivity meter on a water production pipeline of the EDI system, and sending a 4-20mA signal by the PLC system to a first on-site manual controller U2, a second on-site manual controller U4 and a target value U6 of the third EDI controller after comparing and calculating the target resistivity value in advance, and outputting the target value of the first on-site manual controller U4 mA to enable the current to be larger and smaller than the initial resistor to be in the PID regulator, and enabling the current to be smaller and smaller than the initial resistor to be operated.

Step 3, system shutdown, including protection shutdown, on-site shutdown and remote shutdown;

the step 3 comprises the following steps:

step 3.1, protection stopping, namely when an EDI water inflow switch detects that the flow is insufficient and water is cut off, a first intermediate relay K1 is electrified, an auxiliary contact starts rectifier self-protection and automatically cuts off direct current output, a first indicator lamp D1 is arranged on the device to light and alarm, when any 1 set of 3 sets of rectifiers breaks down, the 9 terminal and 10 terminal of a first wiring terminal board JP1 send out a short pulse signal, a second intermediate relay K2, a third intermediate relay K3 or a fourth intermediate relay K4 is electrified and self-locked, the second indicator lamp D2, the third indicator lamp D3 or the fourth indicator lamp D4 lights, so that an operator can conveniently judge which rectifier breaks down, at the moment, a PLC system triggers the shutdown sequence control after receiving the rectifier fault signal, a remote side loop loses electricity, an alternating current contactor KM1 coil loses electricity, a main contact is disconnected, a primary loop is disconnected, a second lamp-carrying button S3 is lighted, and the rectifier loses electricity, and the system stops operating;

Step 3.2, when the two-position knob S1 is positioned on the on-site side, when the second button S3 with the lamp is pressed, the coil of the alternating current contactor KM1 is powered off, the main contact is disconnected, the primary loop is disconnected, the indicator lamp of the second button S3 with the lamp is lighted, the rectifier is powered off, and the system is stopped;

And 3.3, remotely stopping, namely triggering shutdown sequence control by the PLC system after a soft manual operation triggering stopping instruction is performed on an upper computer by an operator, powering down a remote side loop, powering down an alternating current contactor KM1 coil, disconnecting a main contact, disconnecting a primary loop, turning on an indicator lamp of a second button S3 with a lamp, powering down a rectifier and stopping the system.

Claims (6)

1. The rectification electric control method for the electric desalting system is executed by a rectification electric control device for the electric desalting system and is characterized by comprising a power supply, a device electric control loop, a rectification controller module and a local manual controller module, wherein the power supply is electrically connected with the device electric control loop, the rectification controller module and the local manual controller module, the device electric control loop comprises a device electric primary loop and a device electric secondary loop, the rectification controller module comprises a first rectification controller U1, a second rectification controller U3 and a third rectification controller U5, and 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 electric primary loop of the device, a primary loop breaker Q1 and an alternating current contactor KM1 are arranged for supplying power to the on-off rectification controller module, and an energizing indicator lamp H1 is arranged at the phase to indicate whether the rectification controller module is in an energizing state or not;

In the electric secondary circuit of the device, a secondary circuit breaker Q2 is arranged for switching on/off a secondary circuit power supply, a two-position knob S1 is used for switching on-site or remote control, a normally open auxiliary contact is used for remote state indication, a first button S2 with a lamp is used for on-site disk control starting a rectifier, a second button S3 with a lamp is used for on-site disk control stopping the rectifier, a button S4 is connected in series with a self-locking loop of the first button S2 with the lamp, the second button S3 with the lamp and the button S4 with the lamp and used for on-site disk control resetting of the rectifier, a coil of a first intermediate relay K1 is connected with a normally open contact of a water cut-off flow switch in series, coils of the second intermediate relay K2, a third intermediate relay K3 and a fourth intermediate relay K4 are connected in series with alarm normally open contacts of the first rectifying controller U1, the second rectifying controller U3 and the third rectifying 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 of the normally open contacts of the first intermediate relay D3 and the fourth intermediate relay K4 is connected with the normally open contacts of the second intermediate relay D3 and the fourth intermediate relay K4 is used for switching off the normally open contacts of the first intermediate relay and the third rectifying controller to the normally open contacts of the third intermediate relay K4, and the normally open contacts of the third intermediate relay D3 are connected with the normally open contacts and the normally open contacts of the third normally open contacts are used for outputting normally open signals of the normally open control signal to the normally close control circuit and the normally down;

The method comprises the following steps:

Step 1, powering up a system, namely closing a primary circuit breaker Q1 and a secondary circuit breaker Q2, and turning on an energizing indicator lamp H1 at the moment to indicate that the power supply of the device is powered up;

step 2, starting the system, namely beating the two-position knob S1 to the local side, and manually adjusting the direct current output of the rectifier through the local manual controller, wherein after debugging is finished, beating the two-position knob S1 to the remote control side, and automatically adjusting the direct current output of the rectifier through the local manual controller by the PLC system according to a current given signal of the rectifier;

And 3, system shutdown, including protection shutdown, in-situ shutdown and remote shutdown.

2. The rectification electrical control method for an electric desalination system according to claim 1, wherein power sources of a first rectification controller U1, a second rectification controller U3 and a third rectification controller U5 are respectively taken to an output side of an alternating current contactor KM1, terminals 9 and 10 of a first wiring terminal board JP1 of the first rectification controller U1, the second rectification controller U3 and the third rectification controller U5 are rectifier fault alarming output terminals, terminals 1 and 2 are water-break shutdown input terminals, terminals 1,2 and 3 of a second wiring terminal board JP2 are signal conversion terminals of a first on-site manual controller U2, a second on-site manual controller U4 and a third on-site manual controller U6, and a third wiring terminal board JP3 is a power supply output terminal and is connected to an EDI module through a cable;

the terminals 1 and 2 of the first on-site manual controller U2, the second on-site manual controller U4 and the third on-site manual controller U6 are power supply terminals, the terminals 3 and 4 are remote current given terminals, and the terminals 5, 6, 7 and 8 are signal exchange terminals with the rectification controller.

3. The method of rectifying an electrical control for an electrical desalination system of claim 2 wherein the rectifying electrical control device is provided with interface terminals for remote status monitoring and control.

4. A rectifying electric control method for an electric desalination system according to claim 3, characterized in that said power supply is an alternating current AC380V power supply.

5. The commutating electronic control method for an electric desalting system according to claim 1, wherein step 3 comprises:

Step 3.1, protection stopping, namely when an EDI water inflow switch detects that the flow is insufficient and water is cut off, a first intermediate relay K1 is powered on, an auxiliary contact starts rectifier self-protection and automatically cuts off direct current output, a first indicator lamp D1 is arranged on the device to be lightened and give an alarm, when any 1 set of 3 sets of rectifiers breaks down, the 9 terminals and 10 terminals of a first wiring terminal board JP1 send out a short pulse signal, a second intermediate relay K2, a third intermediate relay K3 or a fourth intermediate relay K4 are powered on and self-locked, the second indicator lamp D2, the third indicator lamp D3 or the fourth indicator lamp D4 are lightened, at the moment, a PLC system triggers stopping sequence control after receiving a rectifier fault signal, a remote side loop is in power failure, an alternating current contactor KM1 coil is in power failure, a main contact is disconnected, a primary loop is disconnected, a second lamp-carrying button S3 is lightened, and the rectifier is in power failure;

Step 3.2, when the two-position knob S1 is positioned on the on-site side, when the second button S3 with the lamp is pressed, the coil of the alternating current contactor KM1 is powered off, the main contact is disconnected, the primary loop is disconnected, the indicator lamp of the second button S3 with the lamp is lighted, the rectifier is powered off, and the system is stopped;

And 3.3, remotely stopping, namely triggering shutdown sequence control by the PLC system after a soft manual operation triggering stopping instruction is performed on an upper computer by an operator, powering down a remote side loop, powering down an alternating current contactor KM1 coil, disconnecting a main contact, disconnecting a primary loop, turning on an indicator lamp of a second button S3 with a lamp, powering down a rectifier and stopping the system.

6. The commutating electronic control method for an electric desalting system according to claim 1, wherein step 2 comprises:

Step 2.1, manually starting, namely, beating a two-position knob S1 to the on-site side, at the moment, the on-site side loop of a secondary loop is on, pressing a first button S2 with a lamp, conducting electricity and closing by an alternating current contactor KM1 coil, closing a main contact of the alternating current contactor KM1 in a primary loop, closing an auxiliary contact to lock the secondary loop, conducting electricity on the primary loop, lighting an indicator lamp of the first button S2 with the lamp, starting output after judging that the system is in a non-water-break state by a rectifier, outputting a default direct current by a third wiring terminal board JP3 terminal, driving an EDI module to produce water, and detecting the resistivity of the produced water by a resistivity meter on a water production pipeline of the EDI system to realize on-site and remote display;

Step 2.2, remote starting, namely switching to an automatic operation mode after system debugging is finished, beating a two-position knob S1 to a remote control side, at the moment, beating a secondary circuit remote control side loop to be on, manually pressing a starting button by an operator at an upper computer, namely sending a remote starting long pulse instruction to terminals 7 and 8 of an X1 terminal row by a PLC system, powering on an alternating current contactor KM1 coil, powering on a primary loop, lighting an indicator lamp of a first lamp button S2, starting and outputting a rectifier after judging that the system is in a non-water-cutting state, outputting a default direct current by a terminal JP3 of a third wiring terminal board, driving an EDI module to produce water, realizing on-site and remote display of the produced water resistivity through a resistivity meter on a water production pipeline of the EDI system, and sending a 4-20mA signal by the PLC system to a target value of the first on-site manual controller U2, a second on-site manual controller U4 and a target value of the third EDI controller U6 after comparing and calculating the target resistivity value of the target resistivity value set in advance in the PID controller, and outputting the target value of the first on-site rectifier U4 mA controller to enable the current to be close to the initial resistor to be large.