Restarting device for maintaining fault reset starting signal

Abstract

The utility model discloses a restarting device for maintaining a fault reset starting signal. The restarting device comprises a frequency converter VVVF, a logic control module, a timing module and an expansion relay, the frequency converter VVVF comprises a control button, a reset terminal and a starting terminal; the expansion relay is electrically connected with the frequency converter VVVF; the reset terminal is used for controlling the frequency converter VVVF to reset; the timing module is electrically connected with the logic control module and is used for presetting a time threshold value; the logic control module comprises a first contact and a second contact which are used for inputting a working power supply, the first contact is connected with a live wire L of a control power supply, and the second contact is connected with a null line and is used for detecting the voltage change of the power supply. Compared with the prior art, the restarting device provided by the utility model has the advantages that the operation signal of the frequency converter can be ensured to be in an on-line logic keeping mode, the efficiency is high when the frequency converter is judged and restarted, and the continuous production of factories and enterprises is further ensured.

Description

Technical Field

[0001] The present application relates to the technical field of industrial control devices, and in particular to a restart device capable of maintaining a fault reset start signal. Background Art

[0002] Frequency converters are widely used in the field of industrial control. Due to the perfect protection characteristics of the frequency converter itself, it has automatic reset and restart functions for some faults. In daily use of frequency converters, when the motor is running normally, the low voltage protection of the frequency converter may trip due to a momentary power "swing". Usually, when the power is automatically restored, manual operation is required to restore the operation of the motor, causing unnecessary shutdown of the running motor and interruption of production. This will cause great economic losses to continuous production enterprises such as petroleum, petrochemical, chemical, electric power, and metallurgy, and may even lead to safety accidents.

[0003] In existing technologies, the inverter itself lacks the ability to determine which faults warrant automatic reset and restart, and which faults are neither resettable nor restartable. This requires the user to determine and restart the inverter on their own, which is inefficient. Furthermore, transient grid faults may not always cause the inverter to shut down due to fault protection. This can occur due to the release of the inverter's start relay coil, or due to the inverter's fault protection tripping, which disconnects the start relay coil circuit and causes it to release. These factors can intertwine, making accurate determination and prompt restart difficult in existing technologies. Utility Model Content

[0004] The present invention mainly aims at the above problems and proposes a restart device with fault reset and start signal retention, aiming to solve the technical problems in the background technology.

[0005] To achieve the above object, the utility model provides a restart device with fault reset and start signal retention, comprising a frequency converter VVVF, a logic control module, a timing module, an output relay module, and an expansion relay;

[0006] The frequency converter VVVF includes a control button, a reset terminal, and a start terminal; the expansion relay is electrically connected to the frequency converter VVVF; the reset terminal is used to control the frequency converter VVVF to reset; the timing module is used to preset a time threshold;

[0007] The logic control module includes a first contact and a second contact for inputting a working power supply, wherein the first contact is connected to the live wire L of the control power supply, and the second contact is connected to the neutral wire and is used to detect changes in the power supply voltage;

[0008] The logic control module includes a third contact and a fourth contact, the third contact and the fourth contact being electrically connected to the frequency converter VVVF and being normally open contacts for inputting the frequency converter operation status into the logic control module;

[0009] The logic control module includes a fifth contact and a sixth contact for outputting a restart instruction, wherein the fifth contact and the sixth contact are electrically connected in parallel with two ends of the control button;

[0010] The logic control module includes a seventh contact and an eighth contact for outputting a reset pulse signal, wherein the seventh contact and the eighth contact are electrically connected to the reset terminal;

[0011] The logic control module includes a ninth contact and a tenth contact for inputting a fault signal of the frequency converter, wherein the ninth contact and the tenth contact are electrically connected to the extension relay and are normally open contacts for inputting a fault signal to the logic control module;

[0012] The logic control module includes an 11th contact and a 12th contact for inputting a start-up hold signal, and the 11th contact and the 12th contact are connected in parallel to the start terminal.

[0013] Furthermore, it includes a backup power supply module, which is electrically connected to the logic control module and the reset terminal, and is used to power the restart device according to the control instructions of the logic control module when the external power supply loses voltage or is undervoltage instantaneously.

[0014] Compared with the existing technology, the utility model provides a restart device with fault reset start signal retention, which can ensure that the operating signal of the inverter is in the online logic hold mode, is highly efficient in judging and restarting the inverter, and accurately judges the specific factors of shutdown caused by multiple factors, thereby ensuring the continuous production of factories and enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural block diagram of the connections between components of a restart device with fault reset and start signal retention according to the present application.

[0016] Figure 2 This is an example wiring schematic diagram of a restart device with fault reset and start signal retention in this application.

[0017] Reference numerals shown in the figure: 1. frequency converter VVVF; 110. control button; 120. reset terminal; 130. start terminal; 2. logic control module; 3. timing module; 4. output relay module; 5. extension relay; 6. backup power supply module. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It is understood that the drawings are only provided for reference and illustration purposes and are not used to limit the present invention. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0019] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field of the present invention. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms used in this document in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] It should also be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Please refer to Figure 1 and Figure 2 , this embodiment provides a restart device with fault reset start signal retention, including a frequency converter VVVF1, a logic control module 2, a timing module 3, an output relay module 4, and an expansion relay 5;

[0022] The frequency converter VVVF1 includes a control button 110, a reset terminal 120, and a start terminal 130; the expansion relay 5 is electrically connected to the frequency converter VVVF1; the reset terminal 120 is used to control the frequency converter VVVF1 to reset; the timing module 3 is used to preset a time threshold;

[0023] The logic control module 2 includes a first contact and a second contact for inputting a working power supply, wherein the first contact is connected to the live wire L of the control power supply, and the second contact is connected to the neutral wire and is used to detect changes in the power supply voltage;

[0024] The logic control module 2 includes a third contact and a fourth contact, which are electrically connected to the frequency converter VVVF1 and are normally open contacts for inputting the frequency converter operation status into the logic control module 2;

[0025] In addition, the third and fourth contacts are connected to a pair of normally open nodes of relay KA that starts the inverter, and are also electrically connected to VVVF.

[0026] The logic control module 2 includes a fifth contact and a sixth contact for outputting a restart instruction, and the fifth contact and the sixth contact are electrically connected in parallel to both ends of the control button 110;

[0027] The logic control module 2 includes a seventh contact and an eighth contact for outputting a reset pulse signal, and the seventh contact and the eighth contact are electrically connected to the reset terminal 120;

[0028] The logic control module 2 includes a ninth contact and a tenth contact for inputting a fault signal of the frequency converter. The ninth contact and the tenth contact are electrically connected to the extension relay 5 and are normally open contacts for inputting a fault signal to the logic control module 2.

[0029] The logic control module includes an 11th contact and a 12th contact for inputting a start-up hold signal, and the 11th contact and the 12th contact are connected in parallel to the start terminal.

[0030] The operating principle of the restart device with fault reset start signal retention is as follows: the timing module 3 pre-arranges the preset time 1, preset time 2, and preset time 3;

[0031] 1. When it is detected that the inverter VVVF1 is running, that is, the 3rd and 4th contacts are closed, the 11th and 12th contacts are closed within the preset time one; when the 3rd and 4th contacts detect that the inverter VVVF1 is in operation and the contact is disconnected, and the voltage drop amplitude of the 1st and 2nd contacts reaches the preset voltage threshold one, and the 9th and 10th contacts do not input the inverter fault signal within the preset time two, the 11th and 12th contacts continue to be closed. If the 9th and 10th contacts do not detect the fault signal input within the preset time two, when the voltage returns to the preset threshold 2, the 5th and 6th contacts output the restart signal.

[0032] Second, if contacts 9 and 10 detect a fault signal input within preset time 2, contacts 11 and 12 are momentarily disconnected. When contacts 1 and 2 detect that the voltage has returned to preset voltage threshold 2, contacts 7 and 8 output a reset pulse signal. When contacts 9 and 10 detect that the fault signal has disconnected, contacts 5 and 6 output a restart command. If contacts 9 and 10 still detect a fault signal input within preset time 3 after contacts 7 and 8 output the reset pulse signal, contacts 7 and 8 again output the reset pulse signal until contacts 9 and 10 no longer detect a fault signal input within preset time 2. Within preset time 3, as long as contacts 7 and 8 send a reset pulse and contacts 9 and 10 detect that the fault signal has disconnected, contacts 5 and 6 output the restart signal.

[0033] 3. When the 3rd and 4th contacts detect that the inverter operation signal is disconnected, and the 1st and 2nd contacts detect that the voltage drop does not reach the preset threshold 1, the 11th and 12th contacts of the start signal holding contacts are immediately disconnected, and the 5th and 6th contacts do not issue a restart command.

[0034] 4. When the 9th and 10th contacts detect the inverter fault signal input, and the 1st and 2nd contacts detect that the voltage drop does not reach the preset threshold 1, the 11th and 12th contacts start the signal holding contacts and immediately disconnect, and the 7th and 8th contacts do not send a reset pulse signal.

[0035] 5. When the 7th and 8th contacts send out the restart command, the 3rd and 4th contacts detect that the inverter operation signal is closed, then the 11th and 12th contacts continue to be closed.

[0036] In this embodiment, the three-phase coils L1 , L2 , L3 , the circuit breaker QF1 , the fuse Fuse, the frequency converter VVVF and the motor M form a main circuit, and the logic control module 2 is connected in parallel to the control circuit of the frequency converter VVVF1 .

[0037] The 3rd and 4th contacts are a pair of input terminals of the logic control module of the motor restart controller, which are input contacts for detecting the operating status of the inverter. They are a pair of normally open contacts of the operating signal of the starting relay KA of the inverter. After the inverter starts running, the starting relay KA of the inverter is energized and closed, and the pair of normally open contacts of the operating signal of the starting relay KA connected to the 3rd and 4th contacts are closed.

[0038] Please refer to Figure 1 and Figure 2 , including a backup power supply module 6, which is electrically connected to the logic control module 2 and the reset terminal 120, and is used to power the restart device according to the control instruction of the logic control module 2 when the external power supply loses voltage or is undervoltage instantaneously.

[0039] The restart device for maintaining the fault reset start signal provided in this application ensures that the operating signal of the inverter is in the online logic hold mode, the efficiency of judging and restarting the inverter is high, and the specific factors of the shutdown caused by multiple factors are accurately judged, thereby ensuring the continuous production of factories and enterprises.

[0040] It is in online logic hold mode. Specifically, "online" means that the inverter hold signal provided is held when the inverter is running, and "logic" means that it is held only in specific circumstances, not in all circumstances.

[0041] In the description and claims of this application, the words "include / comprise" and the words "have / include" and their variations are used to specify the existence of stated features, values, steps or components, but do not exclude the existence or addition of one or more other features, values, steps, components or their combinations.

[0042] Some features of the present invention are described in separate embodiments for clarity of explanation, however, these features may also be described in combination in a single embodiment. Conversely, some features of the present invention are described in a single embodiment for brevity, however, these features may also be described in different embodiments individually or in any suitable combination.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A restart device with a fault reset start signal maintained, characterized in that: Including frequency converter VVVF, logic control module, timing module, and expansion relay; The frequency converter VVVF includes a control button, a reset terminal, and a start terminal; the expansion relay is electrically connected to the frequency converter VVVF; the reset terminal is used to control the frequency converter VVVF to reset; the timing module is electrically connected to the logic control module and is used to preset a time threshold; The logic control module includes a first contact and a second contact for inputting a working power supply, wherein the first contact is connected to the live wire L of the control power supply, and the second contact is connected to the neutral wire and is used to detect changes in the power supply voltage; The logic control module includes a third contact and a fourth contact, the third contact and the fourth contact being electrically connected to the frequency converter VVVF and being normally open contacts for inputting the frequency converter operation status into the logic control module; The logic control module includes a fifth contact and a sixth contact for outputting a restart instruction, wherein the fifth contact and the sixth contact are electrically connected in parallel with two ends of the control button; The logic control module includes a seventh contact and an eighth contact for outputting a reset pulse signal, wherein the seventh contact and the eighth contact are electrically connected to the reset terminal; The logic control module includes a ninth contact and a tenth contact for inputting a fault signal of the frequency converter, wherein the ninth contact and the tenth contact are electrically connected to the extension relay and are normally open contacts for inputting a fault signal to the logic control module; The logic control module includes an 11th contact and a 12th contact for inputting a start-up hold signal, and the 11th contact and the 12th contact are connected in parallel to the start terminal.

2. A restart device with fault reset start signal retention according to claim 1, characterized in that: It includes a backup power supply module, which is electrically connected to the logic control module and the reset terminal, and is used to power the restart device according to the control instructions of the logic control module when the external power supply loses voltage or is undervoltage instantaneously.

3. A restart device with fault reset start signal retention according to claim 2, characterized in that: It includes an output relay module, which is electrically connected to the backup power supply module, and the logic control module blocks the startup instruction of the frequency converter VVVF; after the logic control module controls the backup power supply module to supply power to the output relay module, the output relay module blocks the startup instruction of the frequency converter VVVF.

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