Motor control relay board and electrical cabinet

Abstract

The utility model discloses a motor control relay board and an electrical cabinet, and belongs to the field of electrical loop control, the motor control relay board comprises a circuit board, a terminal strip module and a relay module, the terminal strip module and the relay module are arranged on the circuit board, one end of the terminal strip module is used for being connected with a control button, the other end of the terminal strip module is connected with the relay module, and the relay module is used for being connected with main control equipment. The terminal strip module comprises a terminal strip X1, a terminal strip X2 and a terminal strip X3; the relay module comprises a relay K1 used for controlling start and stop of the main control device, a relay K2 used for controlling and feeding back the remote state of the main control device, a relay K3 used for controlling and feeding back the operation state of the main control device, and a relay K4 used for controlling and feeding back the fault state of the main control device. The motor control relay board provided by the utility model can be applied to the control of conventional motors inside and outside an electrical cabinet, achieves the standardization of products, reduces the working intensity of subsequent transformation, and greatly reduces the later maintenance cost.

Description

TECHNICAL FIELD

[0001] The application relates to an electric motor control relay board and an electric cabinet, and belongs to the field of electric circuit control. BACKGROUND

[0002] With the increasing popularity of automation or distributed control in factories, too many non-standardized links and diversified non-site devices in the industry lead to a very serious non-standardization of the whole industry. Different design requirements and ideas, combined with different design styles of designers, and after assembly by different assembly workers, the effects of assembly for realizing the same function are various, which leads to great difficulty in maintenance. For example, if a user needs a system of a link, different manufacturers will propose different design schemes, different engineers will produce more different detailed schemes according to different design schemes, and different processing manufacturers will produce various processing styles, which cannot be unified. Moreover, when a user needs a system of multiple links, the more links, the more difficult to find the same equipment. At the same time, due to product replacement, personnel flow, different technical levels and other factors, it is difficult for manufacturers to produce the same equipment as before, and thus problems such as function and quality problems are difficult to guarantee, production cycle is prolonged and other problems.

[0003] In addition, when the electric cabinet body is replaced, most of the modification projects cannot be re-purchased due to conditions, environment, funds and other problems, and it is difficult to meet the production demand in function, such as a heat company needs to modify multiple heat exchange stations. Since the construction of each heat exchange station is carried out gradually, it cannot be guaranteed to be purchased from the same company, and even if it is purchased from the same company, it is difficult to be unified. Further, the electric circuit in the cabinet needs to be re-assembled by personnel on site during project modification, and the maintenance cost is high. On the other hand, since the common cabinet electric circuit control in the field is connected by a control button and a terminal block, the terminal block is connected with a circuit device, and the circuit device is connected with an auxiliary contact of a contactor to form a feedback loop for action, the connection of each wire head is very complicated and is not conducive to identification, and occupies a large space, and the process is more, and it is difficult to quickly handle the fault. Therefore, it is necessary to find a standard for solidifying part of the function product from the non-standard industry. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the application is to provide an electric motor control relay board and an electric cabinet, which standardizes the connection line between the terminal block and the circuit device, can realize the start control and state feedback of most master control devices, and start and troubleshoot the motor in time.

[0005] To achieve the above purpose, the application provides an electric motor control relay board, which comprises:

[0006] A circuit board, a terminal block module and a relay module provided on the circuit board, one end of the terminal block module being connected to a control button and the other end being connected to the relay module, the relay module being connected to a main control device, wherein the terminal block module includes a terminal block X1, a terminal block X2, and a terminal block X3, and the relay module includes a relay K1 for controlling the start and stop of the main control device, a relay K2 for controlling and providing feedback on the remote status of the main control device, a relay K3 for controlling and providing feedback on the operating status of the main control device, and a relay K4 for controlling and providing feedback on the fault status of the main control device;

[0007] Terminal block X1 is used to send control signals to the main control device based on the control buttons and relay module to control the start, stop, and real-time status of the main control device. Terminal block X2 is used to send control signals to the main control device through the PLC based on the control buttons and relay module to collect the real-time status of the main control device. Terminal block X3 is used to send control signals to the main control device based on the control buttons and relay module to collect the real-time status of the main control device when a remote operation box or electrical control circuit is involved.

[0008] Optionally, the terminal block module further includes: a terminal block X4, and a terminal block X5 directly connected to the terminal block X4.

[0009] Optionally, a circuit breaker is further provided on the circuit board, the main control device controls the motor by active control, and the terminal block X1 includes terminal X101, terminal X102, terminal X103, terminal X104, terminal X105, terminal X106, terminal X107, terminal X108, terminal X109, and terminal X110;

[0010] Among them, terminal X101 is used to connect to the live wire, terminal X102 is used to connect to the neutral wire, terminal X103 and terminal X104 are both connected to relay K1, terminal X105 and terminal X106 are empty, terminal X107 and terminal X108 are both connected to the operation feedback point of the main control device, and terminal X109 and terminal X110 are both connected to the fault feedback point of the main control device.

[0011] Optionally, the main control device controls the motor by passive control, and the terminal block X1 includes terminal X101, terminal X102, terminal X103, terminal X104, terminal X105, terminal X106, terminal X107, terminal X108, terminal X109, and terminal X110;

[0012] The terminal X101 is used for connecting with the live wire, the terminal X102 is used for connecting with the zero wire, the terminal X103 and the terminal X104 are connected with the relay K1, the terminal X105 and the terminal X106 are remote state terminals, the terminal X107 and the terminal X108 are connected with the operation feedback point of the master control device, the terminal X109 and the terminal X110 are connected with the fault feedback point of the master control device.

[0013] Optionally, the terminal row X2 comprises: a terminal X201, a terminal X202, a terminal X203, a terminal X204.

[0014] The terminal X201 and the terminal X202 are connected with the dry contact of the relay K4 and the coil of the relay K1 respectively, so as to remotely control the start and stop of the master control device through the PLC, and the terminal X203 and the terminal X204 are empty.

[0015] Optionally, the real-time state of the master control device comprises a remote state, an operation state and a fault state of the master control device, and the terminal row X2 further comprises a terminal X205, a terminal X206, a terminal X207 and a terminal X208.

[0016] The terminal X205 is connected with the dry contact of the relay K2, so as to feed back the remote state of the master control device through the dry contact, the terminal X206 is connected with the dry contact of the relay K3, so as to feed back the operation state of the master control device through the dry contact, the terminal X207 is connected with the dry contact of the relay K4, so as to feed back the fault state of the master control device through the dry contact, and the terminal X208 is a common terminal.

[0017] Optionally, the terminal row X3 comprises a terminal X301, a terminal X302, a terminal X303, a terminal X304, a terminal X305, a terminal X306, a terminal X307 and a terminal X308.

[0018] The terminal X301 is connected with the live wire through the dry contact of the relay K4, the terminal X302 and the terminal X303 are connected with the self-locking point and the coil of the relay K1 respectively, the terminal X304 is connected with the coil of the relay K2, so as to feed back the remote state of the master control device actively, the terminal X305, the terminal X306 and the terminal X307 are connected with the AC220V power supply through the corresponding relays, so as to feed back the remote state, the operation state and the fault state of the master control device actively, and the terminal X308 is used for connecting with the zero wire.

[0019] Optionally, the terminal row X4 comprises a terminal X401, a terminal X402, a terminal X403 and a terminal X404, and the terminal row X5 comprises a terminal X501, a terminal X502, a terminal X503 and a terminal X504.

[0020] Wherein, the terminal X401 is in direct communication with the terminal X501, the terminal X402 is in direct communication with the terminal X502, the terminal X403 is in direct communication with the terminal X503, and the terminal X404 is in direct communication with the terminal X504.

[0021] The application also provides an electrical cabinet, wherein the electrical cabinet is provided with the motor control relay board.

[0022] The motor control relay board and the electrical cabinet provided by the application have the following beneficial effects: compared with the prior art, the motor control relay board provided by the application is applied to the control of conventional motors inside and outside the electrical cabinet, the connection lines between the terminal rows and the circuit devices are standardized by solidifying the design circuit and the production process, the starting control can be directly realized by automatic suction, the remote state, the running state and the fault state can be controlled and fed back, the motor can be started and the fault can be eliminated in time, the product is standardized, the production cost and the failure rate are lower, the occupied space is smaller, the application range is wider, the working strength of subsequent modification is reduced, and the maintenance cost in the later period is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 A structural schematic diagram of the motor control relay board provided by the embodiment of the application is shown in the figure.

[0025] Figure 2 A PCB wiring schematic diagram of the motor control relay board provided by the embodiment of the application is shown in the figure. Figure 3 A schematic diagram of a traditional wiring mode provided by the embodiment of the application is shown in the figure.

[0026] Figure 4 A schematic diagram of the wiring mode of the motor control relay board provided by the embodiment of the application is shown in the figure. Figure 5 A PCB wiring schematic diagram of another motor control relay board provided by the embodiment of the application is shown in the figure. Figure 6 A schematic diagram of another traditional wiring mode provided by the embodiment of the application is shown in the figure.

[0027] Figure 7 A schematic diagram of another wiring mode of the motor control relay board provided by the embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, further detailed description will be made to the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "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 used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying 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 limiting the present application.

[0031] As shown in Figure 1 The motor control relay board provided by the embodiment of the present application comprises:

[0032] a circuit board, a terminal block module and a relay module disposed on the circuit board, one end of the terminal block module is used for connecting with a control button, and the other end is connected with the relay module, the relay module is used for connecting with a master control device, wherein the terminal block module comprises a terminal block X1, a terminal block X2 and a terminal block X3, the relay module comprises a relay K1 used for controlling the start and stop of the master control device, a relay K2 used for controlling and feeding back the remote state of the master control device, a relay K3 used for controlling and feeding back the running state of the master control device, and a relay K4 used for controlling and feeding back the fault state of the master control device.

[0033] The terminal block X1 is used for sending a control signal to the corresponding master control device based on the control button and the relay module to control the start and stop of the master control device and / or collect the real-time state of the master control device; the terminal block X2 is used for sending a control signal to the corresponding master control device based on the control button and the relay module through PLC to remotely control the start and stop of the master control device and / or collect the real-time state of the master control device; and the terminal block X3 is used for sending a control signal to the corresponding master control device through the field control button of the remote operation box or other electrical control loop to control the start and stop of the master control device and / or collect the real-time state of the master control device when the remote operation box or other electrical control loop intervenes.

[0034] In an embodiment, the four relays K1, K2, K3 and K4 are connected with the corresponding terminal rows, the relay K1 is mainly responsible for controlling the start and stop of the master control device according to the start signal of the terminal row to control the conventional motor; the relay K2 belongs to the remote state relay, the relay K3 belongs to the running feedback relay, and the relay K4 belongs to the fault feedback relay. Among them, when the relay K2 is turned on, the terminal row X2 controls the start and stop of the master control device through PLC remote control; when the relay K2 is not turned on, the terminal row X3 controls the start and stop of the master control device through electrical control; at the same time, no matter what state the relay K2 is in, the relay K3 is used for running state feedback of the master control device, and the relay K4 is mainly responsible for the management and control of the fault state.

[0035] In an embodiment, the master control device is an active control contactor, a passive control frequency converter, a soft starter, etc. The connection mode of the motor control relay board can be determined according to the electrical main circuit and the control mode. When the master control device controls the motor through active control mode, that is, the motor control relay board is applied to the motor starting circuit controlled by the contactor, the PCB wiring diagram is as shown in Figure 2 At this time, the motor control relay board is called A type relay board. When the master control device controls the motor through passive control mode, that is, the motor control relay board is applied to the motor starting circuit controlled by the frequency converter, soft starter, etc., the PCB wiring diagram is as shown in Figure 5 At this time, the motor control relay board is called B type relay board.

[0036] It should be understood that controlling the start and stop of the master control device means controlling the start / stop of the master control device; collecting the real-time state of the master control device can reflect the remote state, running state and fault state of the master control device. Among them, the remote state means that the current device is under PLC control, automation control, remote control, etc., and the non-remote state means that the current master control device is under electrical control, field control, etc.; the running state means that the master control device is currently running, and the non-running state means that the master control device is currently stopped. The fault state means that the master control device is in a fault state, and the non-fault state means that the master control device is in standby / running.

[0037] In an embodiment, the size of the circuit board is 90*100cm, which occupies less space and has wide application range.

[0038] In an embodiment, in the relay module, the relays K1, K2, K3 and K4 are arranged side by side, the terminal row X1 is arranged on one side of the relay module, and the terminal rows X2 and X3 are arranged on the other side of the relay module, so as to form a fixed template hardware. Through the electrical circuit control of the fixed template hardware, the assembly difficulty is greatly reduced, and the convenience of later maintenance is ensured.

[0039] In an embodiment, the terminal strip module further comprises a terminal strip X4 and a terminal strip X5 passing through the terminal strip X4, so as to be used as a backup in later modification and innovation.

[0040] In an embodiment, the terminal strips X1 and X4 are used for wire connection inside the cabinet, and the terminal strips X2, X3 and X5 are used for cable connection outside the cabinet, the terminal strip X4 is arranged on the same side of the relay module as the terminal strip X1, and the terminal strip X5 is arranged on the same side of the relay module as the terminal strips X2 / X3.

[0041] In an embodiment, a rectangular space is reserved between the terminal strip X5 and the relay module, so as to arrange a LOGO later.

[0042] In an embodiment, the connection lines between the terminal strips and the loop devices are arranged in a standardized manner, and the connection of the wire ends is simplified, so as to realize the standardization of the product and to solidify the design of the loop PCB. As shown in Figure 2 and 5 The terminal strip X1 comprises 10 terminals, i.e., a terminal X101, a terminal X102, a terminal X103, a terminal X104, a terminal X105, a terminal X106, a terminal X107, a terminal X108, a terminal X109 and a terminal X110. The terminal strip X2 comprises 8 terminals, i.e., a terminal X201, a terminal X202, a terminal X203, a terminal X204, a terminal X205, a terminal X206, a terminal X207 and a terminal X208. The terminal strip X3 comprises 8 terminals, i.e., a terminal X301, a terminal X302, a terminal X303, a terminal X304, a terminal X305, a terminal X306, a terminal X307 and a terminal X308.

[0043] In an embodiment, the terminal strip X1 can realize control of devices arranged inside the electrical cabinet by controlling the contactor. The 10 terminals of the terminal strip X1 are divided into four areas, and each area is connected to a fault feedback point, an operation feedback point, a special backup area and a start-stop control point of a main control device from right to left. Specifically, the terminals X101 and X102 are external terminals for providing power supply for a motor control relay board, the terminal X101 is connected to a live wire and the terminal X102 is connected to a zero wire in the embodiment. The relay board of the A model is actively controlled, as shown in Figure 2 The terminal X103 is connected to a live wire through a dry contact point of a relay K1, the terminal X104 is connected to a zero wire, so as to realize active control, and the terminals X105 and X106 are reserved. The relay board of the B model is passively controlled, as shown in Figure 5As shown, the terminal X103 is connected with the terminal X104 through the dry contact of the relay K1, the terminal X105 is connected with the terminal X106 through the dry contact of the relay K2, so as to realize passive control. The terminal X107 is connected with the AC220V power supply through the relay K4, and the terminal X108 is connected with the running feedback point of the master control device through the dry contact of the relay K3, so as to realize feedback to the running state of the master control device; the terminal X109 is connected with the AC220V power supply through the relay K4, and the terminal X110 is connected with the fault feedback point of the master control device through the dry contact of the relay K4, so as to realize feedback to the fault of the master control device.

[0044] In an embodiment, since local control and remote automatic control and feedback are also required in actual application, the relay K2 is set as a remote state relay in the embodiment of the application. In this embodiment, the state of the relay K2 is controlled by the terminal row X2 / X3. The relay K2 is divided into an electric state and a non-electric state. The non-electric state is controlled by the terminal row X3, and the electric state is controlled by the terminal row X2, which meets the actual requirement that the priority of on-site control is higher than that of remote automatic control.

[0045] In an embodiment, the terminal X201 is connected with the live wire through the normally closed point of the relay K4, i.e. in the non-fault state. When a fault occurs, the power supply is automatically disconnected, so as to achieve the protection effect. Then, the terminal X201 is connected with the control point of the master control device through a cable, and then connected with the terminal X202 through the cable. When the relay K2 is powered, the relay K1 is controlled to be attracted, so as to control the start and stop of the master control device. In order to form a double-layer 8P terminal row with the terminal row X3, the terminals X203 and X204 are empty terminals. Meanwhile, the terminals X201 and X202 are isolated from the terminals X205, X206, X207 and X208. Since the voltage level of the terminals X201 and X202 is AC220V, and the voltage level of the terminals X205, X206, X207 and X208 is DC24V, once mixed, the DC24V circuit will be damaged. The terminal X205 is connected with one side of the dry contact of the relay K2, which is a remote feedback terminal. The terminal X206 is connected with one side of the dry contact of the relay K3, which is a running feedback terminal. The terminal X207 is connected with one side of the dry contact of the relay K4, which is a fault feedback terminal. The terminal X208 is connected with the other side of the dry contact of the relays K2, K3 and K4, which is a state feedback common terminal, i.e. a COM terminal.

[0046] In an embodiment, the terminal X301 is also connected with the firewire through the normally closed point of the relay K4, i.e. in the non-fault state; in the fault state, the control power is automatically disconnected to achieve the protection effect, and then connected with the control point of the field device through the cable, returned to the terminal X302 through the local contact side of the local-remote conversion switch and the stop button, returned to X303 through the start button, thereby controlling the power-on and power-off of the relay K1; at the same time, X301 is returned to X304 through the remote contact of the local-remote conversion switch, thereby controlling the power-on and power-off of the relay K2. X305 corresponds to the remote state, is a power indication terminal, and is connected with the firewire. X306 corresponds to the running state, is a running feedback terminal, is connected with one side of the dry contact of the relay K2, and the other side of the dry contact is connected with the firewire; X307 corresponds to the fault state, is a fault feedback terminal, is connected with one side of the dry contact of the relay K4, and the other side of the dry contact is connected with the firewire; and X308 is the zero line, thereby forming a closed AC220V loop with X305, X306 and X307.

[0047] In an embodiment, the terminal row X3 can be connected with an AC220V indicator lamp or other devices to form a closed loop. Specifically, X305 is connected with a power indicator lamp, X306 is connected with a running indicator lamp, and X307 is connected with a fault indicator lamp, and the other ends of the indicator lamps are connected with X308, thereby indicating the state of the field device. If not needed, the relevant terminals can be left floating, without affecting the use.

[0048] In an embodiment, the terminal row X4 includes terminals X401, X402, X403 and X404, and the terminal row X5 includes terminals X501, X502, X503 and X504; wherein the terminal X401 is directly connected with the terminal X501, the terminal X402 is directly connected with the terminal X502, the terminal X403 is directly connected with the terminal X503, and the terminal X404 is directly connected with the terminal X504. This design facilitates the expansion of other occasions and is designed as 4P due to the size of the space.

[0049] In an embodiment, the existing circuit board in the art first needs an electrical designer to draw a schematic diagram as shown in Figure 3 and 6 , and then manually wire. Due to different design styles of different designers, the terminal sequence, wire number, jumper, and placement position are all different, causing the complexity of devices and wiring. After the PCB solidification circuit of the motor control relay board provided in the embodiments of the present application, the wiring diagram is as shown in Figure 4 and 7 . The wiring content of each terminal is fixed, the manual wiring is simple and less prone to errors, and the design and maintenance troubles caused by multiple styles are greatly avoided.

[0050] In an embodiment, as shown inFigure 4 As shown, a fuse is connected between terminal X101 and the live wire for overload and short-circuit protection. Terminal block X1 is connected to the power supply, intermediate relay KM1, and circuit breaker QF1. Terminal block X2 cooperates with relay K2 to achieve remote control via the PLC. Terminal X208 serves as a common terminal and is connected to the 24V power supply G1, forming a common negative. Of the eight terminals on terminal block X3, the four left-hand terminals X301, X302, X303, and X304, from left to right, can sequentially connect to the four wiring ports of the various control buttons. The four right-hand terminals X305, X306, and X307 are connected to the power indicator H1, the run indicator H2, and the fault indicator H3, providing status feedback through the indicators.

[0051] In one embodiment, Figure 7 As shown, a fuse is connected between terminal X101 and the live wire for overload and short-circuit protection. Terminal block X1 is connected to the power supply and inverter (the inverter is used as an example in this diagram). Terminal block X2 works with relay K2 to enable remote control via the PLC. Terminal X208 serves as the common terminal and is connected to the 24V power supply G1, forming a common negative. Of the eight terminals on terminal block X3, the four left-hand terminals (X301, X302, X303, and X304) connect to the four wiring ports of the control buttons from left to right. The four right-hand terminals (X305, X306, and X307) connect to the power indicator H1, the run indicator H2, and the fault indicator H3, providing status feedback.

[0052] As can be seen from the above, the motor control relay board provided in the embodiment of the present application is standardized in the non-standard industry. By solidifying the design circuit and production process, the connecting wires between the terminal block and the circuit components are standardized. Not only is the production cost and failure rate lower, the space occupied is smaller, the scope of application is wide, and the workload of subsequent modifications is reduced, thereby greatly reducing the subsequent maintenance costs.

[0053] An embodiment of the present application further provides an electrical cabinet, in which the standard relay board described in any of the above embodiments is arranged.

[0054] As can be seen from the above, the electrical cabinet provided in the embodiment of the present application controls the electrical circuits inside and outside the cabinet through an electric motor controlling the relay board, has lower production costs and failure rates, occupies less space, has a wide range of applications, reduces the workload of subsequent modifications, and greatly reduces subsequent maintenance costs.

[0055] The motor control relay board and the electrical cabinet provided by the embodiment of the application are described in detail above, and for those skilled in the art, the specific implementation and application range can be changed according to the idea of the embodiment of the application. In conclusion, the content of the specification should not be understood as a limitation of the application, and any change made according to the design idea of the application is within the protection scope of the application.

Claims

1. An electric motor control relay board, characterized by, The utility model relates to a terminal block module and relay module for controlling the start and stop of a master control device, and a terminal block module for collecting the real-time state of the master control device. The terminal block module further comprises a terminal block X4 and a terminal block X5 connected in series with the terminal block X4. When the remote operation box or the electrical control circuit is involved, the terminal block X3 is used to send control signals to the master control device based on the control button and the relay module to collect the real-time state of the master control device.

2. The motor control relay board of claim 1, wherein, The terminal block X1 comprises a terminal X101, a terminal X102, a terminal X103, a terminal X104, a terminal X105, a terminal X106, a terminal X107, a terminal X108, a terminal X109, and a terminal X110.

3. The motor control relay board of claim 1 or 2, wherein, The terminal X101 is used to connect with the live wire, the terminal X102 is used to connect with the zero line, the terminals X103 and X104 are connected with the relay K1, the terminals X105 and X106 are empty, the terminals X107 and X108 are connected with the running feedback point of the master control device, and the terminals X109 and X110 are connected with the fault feedback point of the master control device. The terminal block X1 comprises a terminal X101, a terminal X102, a terminal X103, a terminal X104, a terminal X105, a terminal X106, a terminal X107, a terminal X108, a terminal X109, and a terminal X110.

4. The motor control relay board of claim 1 or 2, wherein, The terminal X101 is used to connect with the live wire, the terminal X102 is used to connect with the zero line, the terminals X103 and X104 are connected with the relay K1, the terminals X105 and X106 are empty, the terminals X107 and X108 are connected with the running feedback point of the master control device, and the terminals X109 and X110 are connected with the fault feedback point of the master control device. The terminal block X2 comprises a terminal X201, a terminal X202, a terminal X203, and a terminal X204.

5. The motor control relay board of claim 1 or 2, wherein, The terminals X201 and X202 are connected with the dry contact point of the relay K4 and the coil of the relay K1, respectively, to remotely control the start and stop of the master control device through the PLC, and the terminals X203 and X204 are empty. ​ 6. The motor control relay board of claim 5, wherein, The real-time state of the master device includes remote state, running state and fault state of the master device, and the terminal row X2 further includes a terminal X205, a terminal X206, a terminal X207 and a terminal X208; The terminal X205 is connected with the dry contact of the relay K2 to perform dry contact feedback on the remote state of the master device, the terminal X206 is connected with the dry contact of the relay K3 to perform dry contact feedback on the running state of the master device, the terminal X207 is connected with the dry contact of the relay K4 to perform dry contact feedback on the fault state of the master device, and the terminal X208 is a common terminal.

7. The motor control relay board of claim 1 or 2, wherein, The terminal row X3 includes a terminal X301, a terminal X302, a terminal X303, a terminal X304, a terminal X305, a terminal X306, a terminal X307 and a terminal X308; The terminal X301 is connected with the fire wire through the dry contact of the relay K4, the terminal X302 and the terminal X303 are respectively connected with the self-locking point and the coil of the relay K1, the terminal X304 is connected with the coil of the relay K2 to perform active feedback on the remote state of the master device, the terminal X305, the terminal X306 and the terminal X307 are respectively connected with the AC220V power supply through the corresponding relays to perform active feedback on the remote state, the running state and the fault state of the master device, and the terminal X308 is used for being connected with the zero line.

8. The motor control relay board of claim 2, wherein, The terminal row X4 includes a terminal X401, a terminal X402, a terminal X403 and a terminal X404, and the terminal row X5 includes a terminal X501, a terminal X502, a terminal X503 and a terminal X504; The terminal X401 is directly connected with the terminal X501, the terminal X402 is directly connected with the terminal X502, the terminal X403 is directly connected with the terminal X503, and the terminal X404 is directly connected with the terminal X504.

9. An electrical cabinet, characterized in that The electrical cabinet is provided with the motor control relay board according to any one of claims 1-8.

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