A contactor control module

Abstract

The application provides a contactor control module, comprising a control system connection end, a running feedback connection end and a controlled device connection end, the contactor control module is connected with a control system, a running feedback device and a controlled device through the control system connection end, the running feedback connection end and the controlled device connection end, and the contactor is connected through the controlled device connection end, so that the power supply of a frequency converter to the device is controlled through the contactor; wherein the control system connection end and the running feedback connection end are arranged in a low-voltage control area, and the controlled device connection end is arranged in a high-voltage control area. The contactor control module provided by the application can realize the input and interpretation of multiple contactor feedback signals by using only one set of I / O interface, thereby reducing the demand for the number of control system interfaces; the contactor control module provided by the application has great expansion potential, and the number of devices can be conveniently increased to support the control of more devices.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of automatic control technology, and particularly relates to a contactor control module. BACKGROUND

[0002] In a frequency converter control system, a contactor is often used to realize the connection and disconnection of a power supply line between the frequency converter and a power consuming device. For an automatic control system, the contactor state feedback is a key signal for the system to determine whether the operation is normal: generally, the frequency converter can be started only after the contactor is closed. When the contactor state is inconsistent with the requirement of the control system, it indicates that the control system or the device has a fault, and needs to be repaired in time.

[0003] The input of the contactor feedback signal inevitably needs to occupy the I / O interface of the contactor. The prior art generally provides a set of interfaces for each contactor. When a small controller is needed, the number of I / O interfaces provided by the controller is small, and the number of devices is large, which may result in insufficient number of interfaces. In order to ensure the complete function of the automatic control system, the occupation of the interfaces by the contactors should be reduced as much as possible, so as to leave more interfaces for other control functions.

[0004] In addition, the prior art generally adopts a direct wiring method to connect the control system, the contactor, the operation indicator lamp, and necessary relays, fuses and other devices, the line is complex, the construction and maintenance are difficult, and the system reliability is low. SUMMARY

[0005] To solve the above problems, the application provides a contactor control module, which can realize the input and judgment of the feedback signals of multiple contactors by using only one set of I / O interfaces, reduces the demand for the number of interfaces of the control system, reduces the number of wires, reduces the construction and maintenance difficulty, and improves the reliability of the system.

[0006] To achieve the above purpose, the technical scheme of the application is as follows:

[0007] As shown in Fig. 1-2 The application provides a contactor control module, which comprises a control system connection end, an operation feedback connection end, and a controlled device connection end. The contactor control module is connected with a control system, an operation feedback device, and a controlled device through the control system connection end, the operation feedback connection end, and the controlled device connection end respectively, is connected with a contactor through the controlled device end, and controls the power supply of a frequency converter to the device through the contactor. The control system connection end and the operation feedback connection end are arranged in a low-voltage control area, and the controlled device connection end is arranged in a high-voltage control area.

[0008] The control system connection end comprises at least an interface S K1 , SK2 , S K3 , S K4 , S K5 , S K6 ; the running feedback connection end at least includes interface S L1 , S L2 , S L3 ; the controlled device connection end at least includes interface S J1 , S J2 , S J3 , S J4 , S J5 , S J6 ;

[0009] The interface S K1 one end is connected with the positive pole of the contactor feedback signal of the control system end, and the other end is sequentially connected with resistors at least including R0, R1 and R2, and then connected with the negative pole of the contactor feedback signal through the interface S K2 , and the resistor R1 is connected with the switch C 1-1 in parallel through nodes S1 and S2, and the resistor R2 is connected with the switch C 2-1 in parallel through nodes S3 and S4.

[0010] The interface S K3 one end is connected with the DC 24V+ of the control system end, and the other end forms two parallel lines through nodes S5-S6:

[0011] The node S5 is sequentially connected with the switch C 2-2 and the fuse FU2, and then connected with the positive pole of the contactor C2 attraction signal of the running feedback end through the interface S L2 ;

[0012] The node S6 is sequentially connected with the switch C 1-2 and the fuse FU1, and then connected with the positive pole of the contactor C1 attraction signal of the running feedback end through the interface S L1 ;

[0013] The switches C 1-1 , C 1-2 are the linkage switches of the contactor C1, and when the contactor C1 is powered and attracted, C 1-1 , C 1-2 are synchronously closed.

[0014] The switches C 2-1 , C 2-2 are the linkage switches of the contactor C2, and when the contactor C2 is powered and attracted, C 2-1 , C 2-2 are synchronously closed.

[0015] The interface S K4 one end is connected with the DC 24V- of the control system end, and the other end is connected with the positive pole of the contactor C1 attraction signal of the running feedback end through the interface S L3Access to run feedback contactor closing signal common negative;

[0016] The interface S K5 One end connected to the control system contactor C1 closing signal, the other end of the series FU3 and relay Z1 coil, through the node S7 access DC 24V-;

[0017] The interface S K6 One end connected to the control system contactor C2 closing signal, the other end of the series FU4 and relay Z2 coil, through the node S7 access DC 24V-;

[0018] The interface S J3 One side connected to the AC 220V power zero line, the other side connected to the node S 13 ;

[0019] The interface S J4 One side connected to the AC 220V power line, the other side through the node S 11 Connect the node S9, S 12 , and then form two parallel lines:

[0020] Node S9 connected to the relay Z1 normally open switch Z 1-1 , and then through the interface S J2 Connect the controlled device end contactor C1 fire line, contactor C1 zero line end through the interface S J1 Back to the high voltage control area, and then connected to the node S 13 ;

[0021] Node S 12 Connected to the relay Z2 normally open switch Z 2-1 , and then through the interface S J6 Connect the controlled device end contactor C2 fire line, contactor C2 zero line end through the interface S J5 Back to the high voltage control area, and then connected to the node S 13 ;

[0022] The interface S J3 Through the node S 13 Connect the pressure sensitive resistor RV1, RV1 other side connected to the node S 10 , and then through the node S 11 Connected to the interface S J4 ;

[0023] The interface S J4 Through the node S 11 Connect the pressure sensitive resistor RV2, RV2 other side connected to the node S8, node S8 connected to the AC 220V power ground wire.

[0024] Further, the control system is used for outputting an operation signal of the controlled device, receiving a contactor feedback signal, and providing a DC 24V power supply.

[0025] Further, the control system comprises a DDC controller.

[0026] Further, the connection end of the control system is also provided with a plurality of interfaces for connecting the contactor attraction signal of the control system, and after connecting the fuse and the relay coil in series, the DC 24V is accessed.

[0027] Further, the resistance R0 is also connected in series with a plurality of resistances, and the series resistances correspond to the contactors one by one; each contactor is provided with two linkage normally open switches, one of which is connected in parallel with the resistance corresponding to the contactor, and the other end of the other linkage normally open switch is connected with the positive pole of the DC 24V, and the other end is connected in series with the fuse, and then connected with the operation feedback end corresponding to the contactor attraction signal interface, and the contactor attraction signal positive pole is accessed through a plurality of operation feedback end interfaces.

[0028] Further, the operation feedback end comprises at least two LED indicator lamps, and the positive poles of the indicator lamps are respectively connected with the positive poles of the corresponding contactor attraction signal, and the negative poles are all connected with the common negative pole of the contactor attraction signal.

[0029] Further, the controlled device end comprises at least two contactors, and each contactor is connected with a relay normally open switch.

[0030] Compared with the prior art, the contactor control module provided by the application has the following advantages:

[0031] 1. The contactor control module provided by the application can realize the input and interpretation of a plurality of contactor feedback signals by using only one set of I / O interfaces, thereby reducing the demand for the number of control system interfaces.

[0032] 2. The contactor control module provided by the application has great expansion potential, and can conveniently increase the number of devices to support automatic control of more devices.

[0033] 3. The contactor control module provided by the application, all control signals between the control system end, the operation feedback end and the controlled device end connected therewith are transmitted through the module, and the connection end can use standard plug-in wiring terminals, which greatly simplifies the wiring, facilitates construction and maintenance, and improves the reliability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0035] Fig. 1 A contactor control module circuit schematic created for the present invention;

[0036] Fig. 2 A contactor control module and external device connection schematic created for the present invention;

[0037] Fig. 3 A contactor control module expansion circuit schematic created for the present invention. DETAILED DESCRIPTION

[0038] It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood through specific circumstances.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] As Fig. 1 , 2The application provides a contactor control module, which comprises a circuit board and a control system connection end, an operation feedback connection end and a controlled device connection end arranged on the circuit board, the contactor control module is connected with a control system, an operation feedback device and a controlled device through the control system connection end, the operation feedback connection end and the controlled device connection end respectively, and is connected with a contactor through the controlled device connection end, so that the power supply of a frequency converter to the device is controlled through the contactor; wherein the control system connection end and the operation feedback connection end are arranged in a low-voltage control area, and the controlled device connection end is arranged in a high-voltage control area.

[0043] The control system connection end comprises at least an interface S K1 , S K2 , S K3 , S K4 , S K5 , S K6 ; the operation feedback connection end comprises at least an interface S L1 , S L2 , S L3 ; and the controlled device connection end comprises at least an interface S J1 , S J2 , S J3 , S J4 , S J5 , S J6 .

[0044] One end of the interface S K1 is connected with a contactor feedback signal positive pole of the control system end, and the other end is connected with a contactor feedback signal negative pole through a resistance R0, a resistance R1 and a resistance R2 in sequence and an interface S K2 ; the resistance R1 is connected with a switch C 1-1 in parallel through a node S1 and a node S2; and the resistance R2 is connected with a switch C 2-1 in parallel through a node S3 and a node S4.

[0045] One end of the interface S K3 is connected with a DC 24V+ of the control system end, and the other end forms two parallel lines through a node S5 and a node S6.

[0046] The node S5 is connected with a switch C 2-2 and a fuse FU2 in sequence, and is connected with a contactor C2 attraction signal positive pole of the operation feedback end through an interface S L2 .

[0047] The node S6 is connected with a switch C 1-2 and a fuse FU1 in sequence, and is connected with a contactor C1 attraction signal positive pole of the operation feedback end through an interface S L1 .

[0048] The switches C 1-1 , C1-2 The contactor C1 linkage switch, the contactor C1 on the electric suction, C 1-1 , C 1-2 Synchronous closing;

[0049] The switch C 2-1 , C 2-2 The contactor C2 linkage switch, the contactor C2 on the electric suction, C 2-1 , C 2-2 Synchronous closing;

[0050] The interface S K4 One end is connected to the control system end DC 24V-, the other end is connected to the contactor suction signal common negative through the interface S L3 Access to running feedback end;

[0051] The interface S K5 One end is connected to the control system end contactor C1 suction signal, the other end is connected to the node S7 through the series connection of the fuse FU3 and the relay Z1 coil after accessing DC 24V-;

[0052] The interface S K6 One end is connected to the control system end contactor C2 suction signal, the other end is connected to the node S7 through the series connection of the fuse FU4 and the relay Z2 coil after accessing DC 24V-;

[0053] The interface S J3 One side is connected to the AC 220V power zero line, the other side is connected to the node S 13 ,

[0054] The interface S J4 One side is connected to the AC 220V power fire line, the other side is connected to the node S 11 Connect nodes S9, S 12 , and then form two parallel lines:

[0055] The node S9 connects the relay Z1 normally open switch Z 1-1 , and then connects the controlled device end contactor C1 fire line through the interface S J2 The contactor C1 zero line end is connected back to the high-voltage control area through the interface S J1 , and then connected to the node S 13 ;

[0056] The node S 12 Connects the relay Z2 normally open switch Z 2-1 , and then connects the controlled device end contactor C2 fire line through the interface S J6 The contactor C2 zero line end is connected back to the high-voltage control area through the interface S J5 , and then connected to the node S 13 ;

[0057] The interface S J3 Through the node S 13 The voltage-sensitive resistor RV1 is connected, and the other side of the voltage-sensitive resistor RV1 is connected to the node S 10 , and further through the node S 11 Connected to the interface S J4 ;

[0058] The interface S J4 Through the node S 11 The voltage-sensitive resistor RV2 is connected, and the other side of the voltage-sensitive resistor RV2 is connected to the node S8, and the node S8 is connected to the ground wire of the AC 220V power supply.

[0059] Specifically, the control system is used to output the running signal of the controlled device, receive the contactor feedback signal, and provide a DC 24V power supply.

[0060] Specifically, the control system comprises a DDC controller.

[0061] Specifically, the control system end is also provided with a plurality of interfaces for connecting the contactor attraction signal of the control system end, and the fuse and the relay coil are connected in series, and then connected to DC 24V-.

[0062] Specifically, the resistor R0 is also connected in series with a plurality of resistors, and the connected resistors correspond to the contactors one by one; each contactor is provided with two linkage normally open switches, one of which is connected in parallel with the resistor corresponding to the contactor, and the other end of the other linkage normally open switch is connected to the positive electrode of DC 24V, and the other end is connected in series with the fuse, and then connected to the running feedback end corresponding to the contactor attraction signal interface, and the positive electrode of the plurality of running feedback end interfaces is connected to the positive electrode of the contactor attraction signal respectively.

[0063] Specifically, the running feedback end comprises at least two LED indicator lights, and the positive electrode of each indicator light is connected to the positive electrode of the corresponding contactor attraction signal, and the negative electrode is connected to the common negative electrode of the contactor attraction signal.

[0064] Specifically, the controlled device end comprises at least two contactors, and each contactor is connected to a relay normally open switch.

[0065] Taking the contactor C1 driving 1# device and the contactor C2 driving 2# device as an example, when the control system 1#-2# device DC 24V+ start signal is output through the interface S K5 -S K6 , and the contactors C1-C2 are controlled by the relays Z1-Z2 respectively. For example, when the 1# device starts, the interface S K5 outputs DC 24V voltage, the relay Z1 coil is powered on, the normally open switch Z 1-1 of the relay Z1 is attracted, the contactor C1 power supply circuit is turned on, the contactor C1 is attracted, and the linkage switch C1-1 C 1-2 Closed. Contactor C2 operates on the same principle.

[0066] The control system reads S K1 S K2 Determine the actual closing status of the contactors by checking the resistance value of the inter-circuit circuit (or the corresponding voltage and current values). For example, when all equipment is not running, all contactors are open, and the total resistance between the circuits is R0 + R1 + R2. When contactor C1 is energized and closed, the linkage switch C... 1-1 When the contactor is energized, resistor R1 is short-circuited, and the total resistance of the circuit becomes R0 + R2. If contactor C2 is also energized and closed, the total resistance becomes R0, and so on. By reading the total resistance value (or the corresponding voltage and current values), the state of each contactor can be determined. To achieve the above function, the resistance values ​​of R0 to R2 should be different, and the total resistance value of all their combined states must also be different to ensure that the total resistance value corresponds one-to-one with the open and closed states of the two contactors.

[0067] The operation feedback end is through interface S L1 ~S L2 Receives the contactor activation signal; for example, when contactor C1 is activated, switch C... 1-2 Synchronous closing converts the DC 24V+ power supplied by the control system through node S. L1 The signal is sent to the operation feedback terminal, and the corresponding indicator LED1 lights up. The negative terminals of the two contactor engagement signals mentioned above are connected via S... L3 It is connected to the control system DC 24V to form a complete circuit.

[0068] In this invention, varistor RV1 is connected to the AC 220V live wire and neutral wire at both ends, and varistor RV2 is connected to the AC 220V live wire and ground wire at both ends. Once the voltage of the live wire relative to the neutral or ground wire exceeds a certain value, such as reaching AC 250V, the resistance of the varistor drops sharply, short-circuiting both. The air switch of the AC 220V power supply trips after the short circuit, stopping the power supply and thus preventing equipment damage and safety accidents caused by high voltage.

[0069] Fuse FU1 to FU4 are used to prevent excessive current from damaging the module.

[0070] In summary, the contactor control module provided by this invention can realize the input and interpretation of at least two contactor feedback signals using only one set of I / O interfaces, reducing the requirement for the number of interfaces in the control system. All control signals between the control system end, the operation feedback end, and the controlled equipment end connected to this module are transmitted through this module, and the connection ends can all use standard pluggable terminals, which greatly simplifies wiring, facilitates construction and maintenance, and improves the reliability of the system.

[0071] At the same time, the contactor control module provided by this invention has great expansion potential; it can support more contactor controls with simple modifications. For example, simply increasing the resistance R3 to R4 according to the same rules... n Insurance FU5~FU n Relays Z3 to Z n and linkage switch Z 3-1 ~Z n-1 Z 3-2 ~Z n-2 With these components, the number of contactors it controls can be expanded to three or more, and the control principle is exactly the same.

[0072] For example, Fig. 3 This is a modular circuit containing four contactors. Fig. 3 In this system, only one set of I / O interfaces is used to implement the input and interpretation of the feedback signals of the four contactors.

[0073] Among them, resistors R3 to R4 pass through node S. 16 ~S 19 Respectively with switch C 3-1 ~C 4-1 in parallel;

[0074] Node S 21 Switch C connected in series 3-2 After insurance FU5, via node S L4 Connect the positive terminal of contactor C3 at the end of the linkage device to the activation signal;

[0075] Node S 20 Switch C connected in series 4-2 After insurance FU6, via node S L5 Connect the positive terminal of contactor C4 at the end of the linkage device to engage the signal.

[0076] Switch C 3-1 C 3-2 This is a linkage switch for contactor C3, meaning that when contactor C3 is energized and engaged, C... 3-1 C 3-2 Synchronous closure.

[0077] Switch C 4-1 C 4-2 This is a linkage switch for contactor C4, meaning that when contactor C4 is energized and engaged, C... 4-1 C 4-2 Synchronous closure.

[0078] Interface S K7 One end is connected to the control system contactor C3 to trigger the energizing signal, and the other end is connected in series with fuse FU7 and relay Z3 coil, and then connected to DC 24V through node S7.

[0079] Interface S K8 One end is connected to the control system contactor C4 to trigger the energizing signal, and the other end is connected in series with fuse FU8 and relay Z4 coil, and then connected to DC 24V through node S7.

[0080] Node S 14 One side connection node S 11 On the other side, the normally open relay Z3 is connected. 3-1 Then through interface S J8 Connect the live wire terminal of contactor C3, and connect the neutral wire terminal of contactor C3 via interface S. J7 Reconnect to the high-voltage control area, and then connect to node S. 13 ;

[0081] Node S 15 One side connection node S 11 On the other side, relay Z4 and normally open switch Z are connected. 4-1 Then through interface S J10 Connect the live wire terminal of contactor C4, and connect the neutral wire terminal of contactor C4 via interface S. J9 Reconnect to the high-voltage control area, and then connect to node S. 13 .

[0082] Taking contactor C1 driving device #1, contactor C2 driving device #2, contactor C3 driving device #3, and contactor C4 driving device #4 as an example, this invention controls the DC 24V+ start signal of devices #1 to #4 of the system to be transmitted through node S during operation. K5 ~S K8 The output is used to control contactors C1 to C4 via relays Z1 to Z4 respectively. For example, when device #1 starts, interface S... K5 When the output voltage is DC 24V, the coil of relay Z1 is energized, and its normally open switch Z... 1-1 When the contactor C1 is engaged, the power supply line to contactor C1 is connected, causing C1 to engage and drive its linkage switch C. 1-1 C 1-2 Close. Contactors C2 through C4 operate on the same principle.

[0083] The control system reads S K1 S K2 Determine the actual closing status of the contactors by checking the resistance value of the inter-circuit circuit (or the corresponding voltage and current values). For example, when all equipment is not running, all contactors are open, and the total resistance between the circuits is R0+R1+R2+R3+R4. When contactor C1 is energized and closed, the linkage switch C... 1-1Suction, short-circuiting resistor R1, total resistance of the loop becomes R0+R2+R3+R4. If contactor C2 is also powered to close, the total resistance becomes R0+R3+R4, and the rest can be analogously deduced. By reading the total resistance (or corresponding voltage, current value), the state of each contactor can be resolved. In order to achieve the above function, the resistance values of R0~R4 should be different from each other, and the total resistance of all combination states must also be different from each other, to ensure that the total resistance and the opening and closing state of the four contactors are one-to-one corresponding.

[0084] Operation feedback end through interface S L1 , S L2 , S L4 , S L5 Receive contactor suction signal. For example, when the contactor C1 is suctioned, the switch C 1-2 Synchronously close, send the DC 24V+ power provided by the control system through the node S L1 Into the operation feedback end, corresponding to the indicator light LED1 lighting. The negative pole of the above four-way contactor suction signal passes through S L3 Connect with the control system DC 24V-, form a complete loop.

[0085] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A contactor control module, characterized by: The contactor control module is connected with a control system, an operation feedback device and a controlled device through a control system connection end, an operation feedback connection end and a controlled device connection end respectively, and is connected with a contactor through the controlled device connection end, so as to control the power supply of a frequency converter to the device through the contactor; wherein the control system connection end and the operation feedback connection end are arranged in a low-voltage control area, and the controlled device connection end is arranged in a high-voltage control area. The control system connection end at least includes interface S K1 , S K2 , S K3 , S K4 , S K5 , S K6 ; the running feedback connection end at least includes interface S L1 , S L2 , S L3 ; the controlled device connection end at least includes interface S J1 , S J2 , S J3 , S J4 , S J5 , S J6 ; The interface S K1 One end is connected to the positive pole of the contactor feedback signal of the control system end, and the other end is sequentially connected with resistors at least including R0, R1 and R2, and then connected to the interface S K2 The negative pole of the contactor feedback signal is connected, and the resistor R1 is connected with the switch C through the nodes S1 and S2 1-1 In parallel, the resistor R2 is connected with the switch C through the nodes S3 and S4 2-1 In parallel; The interface S K3 One end is connected to the control system end DC 24V+, and the other end forms two parallel lines through nodes S5-S6: The node S5 is connected in series with the switch C 2-2 and the insurance FU2, through the interface S L2 The access operation feedback terminal contactor C2 is attracted to the positive pole; The node S6 is connected in series with the switch C 1-2 And the insurance FU1, through the interface S L1 Access to the operation feedback contactor C1 suction signal positive. Switch C 1-1 , C 1-2 For contactor C1 linkage switch, contactor C1 on the electric suction, C 1-1 , C 1-2 Synchronous closing; Switch C 2-1 , C 2-2 For contactor C2 linkage switch, contactor C2 on the electric suction, C 2-1 , C 2-2 Synchronous closing; The interface S K4 One end is connected to the control system end DC 24V-, and the other end is connected to the interface S L3 The access operation feedback end is connected to the contactor attraction signal common negative electrode; The interface S K5 One end is connected to the contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C1 contactor C The interface S K6 One end is connected to the contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C2 contactor C The interface S J3 One side is connected to the AC 220V power zero line, and the other side is connected to the node S 13 ; The interface S J4 One side is connected to the live wire of AC 220V power supply, and the other side is connected to the node S 11 Connect the nodes S9, S 12 , and further form two parallel lines: Node S9 connects relay Z1 normally open switch Z 1-1 , through interface S J2 Connect the controlled device end contactor C1 live line end, contactor C1 zero line end through interface S J1 Connect back to the high voltage control area, and then connect to node S 13 ; Node S 12 Connect relay Z2 normally open switch Z 2-1 , through interface S J6 Connect controlled device end contactor C2 live line end, contactor C2 zero line end through interface S J5 Connect back to high voltage control area, and then connect to node S 13 ; The interface S J3 Through the node S 13 The pressure sensitive resistor RV1 is connected, the other side of RV1 is connected to the node S 10 , and further through the node S 11 Connected to the interface S J4 ; The interface S J4 Through the node S 11 The pressure sensitive resistor RV2 is connected, the other side of the pressure sensitive resistor RV2 is connected with the node S8, and the node S8 is connected with the ground wire of the AC 220V power supply.

2. A contactor control module according to claim 1, characterized in that: The control system is used for outputting an operation signal of the controlled device, receiving a contactor feedback signal and providing a DC 24V power supply.

3. A contactor control module according to claim 2, wherein: The control system comprises a DDC controller.

4. A contactor control module according to claim 1, characterized in that: The control system connection end is further provided with a plurality of interfaces for connecting the contactor attraction signal of the control system end, connecting a fuse and a relay coil in series and then connecting a DC 24V.

5. A contactor control module according to claim 1, characterized in that: The resistance R0 is further connected with a plurality of resistances in series, and the series-connected resistances correspond to the contactors one by one. Each contactor is provided with two linkage normally-open switches, one of which is connected with the resistance corresponding to the contactor in parallel, and the other of which is connected with a DC 24V positive electrode at one end and a fuse at the other end, and then connected with the contactor attraction signal interface of the operation feedback end, and the contactor attraction signal positive electrode is connected through a plurality of operation feedback end interfaces.

6. A contactor control module according to claim 1, characterized by: The operation feedback end comprises at least two LED indicator lamps, the positive electrode of each indicator lamp is connected with the contactor attraction signal positive electrode corresponding to the contactor respectively, and the negative electrode is connected with the common negative electrode of the contactor attraction signal.

7. A contactor control module according to claim 4, characterized by: The controlled device end comprises at least two contactors, and each contactor is connected with a relay normally-open switch.

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