Linkage control circuit for multiple dehumidifiers

Abstract

The invention relates to the technical field of dehumidifier control, and particularly discloses a linkage control circuit for multiple dehumidifiers, which comprises a user controller, the multiple dehumidifiers and a through-wall wiring terminal XT, the user controller is provided with a COMP and a 24V AC connecting end; the through-wall wiring terminals XT are arranged on all the dehumidifiers; the control circuit comprises parallel connection and end-to-end connection. In the parallel connection, a COMP connection end and a 24V AC connection end on the user controller are respectively connected in parallel with a DHUM and a COM of a wiring terminal of each dehumidifier. A COMP connecting end and a 24V AC connecting end of the user controller are respectively connected with a DHUM and a COM of a wiring terminal of the first dehumidifier, a DEH and a COM2 on a wiring terminal XT of the first dehumidifier are respectively connected with a DHUM and a COM of a wiring terminal of the second dehumidifier, and so on. The linkage mode can be flexibly selected according to actual scenes, and the dehumidification requirements of spaces of different scales are met.

Description

Technical Field

[0001] The present invention relates to the technical field of dehumidifier control, and particularly to a linkage control circuit for multiple dehumidifiers. Background Art

[0002] An agricultural dehumidifier is a dehumidification device used for greenhouse cultivation, which can accurately control the humidity in the greenhouse and improve the growth quality of cash crops. In many regions, there are special weather conditions such as the plum rain season, resulting in the relative humidity in the air often reaching 80% or even higher. Excessive moisture will have many adverse effects on the planting industry. For greenhouse cultivation, such a high-humidity environment will have a greater impact on the plant growth environment.

[0003] In the greenhouse cultivation environment, precise control of humidity is crucial for the healthy growth of crops. At present, although agricultural dehumidifiers can adjust the humidity in the greenhouse to a certain extent, there are still many problems. On the one hand, the existing dehumidifiers are inconvenient to operate. Each time power is restored, it is necessary to manually operate the start and stop buttons on the device to control the start and stop of the unit. When the greenhouse area is large and multiple dehumidifiers need to be deployed, the workload of the operator is huge. On the other hand, due to the differences in the spatial layout in the greenhouse and the installation positions of the dehumidifiers, there are deviations in the humidity sensed by each dehumidifier, resulting in some dehumidifiers being unable to fully exert their dehumidification effect and unable to achieve uniform and effective control of the humidity in the greenhouse. Summary of the Invention

[0004] The present invention aims to provide a linkage control circuit for multiple dehumidifiers. By optimizing the connection method and control logic of the control circuit, the collaborative work of multiple dehumidifiers can be realized, the dehumidification efficiency can be improved, the circulation problem can be avoided, the impact on the power grid caused by the simultaneous start of the motor load can be reduced, and the problem of greenhouse humidity regulation can be effectively solved.

[0005] The object of the present invention can be achieved by the following technical solutions: A linkage control circuit for multiple dehumidifiers includes a user controller, multiple dehumidifiers, and a wall-through wiring terminal XT; the user controller has COMP and 24V AC connection terminals; the wall-through wiring terminal XT is provided on each dehumidifier and includes FLOAT, DHUM, FAN, COM, DEH, and COM2 connection positions; The control circuit includes a parallel connection method and a head-to-tail connection method. Among them, the parallel connection method: The COMP connection terminal and the 24V AC connection terminal on the user controller are respectively connected in parallel with the DHUM connection position and the COM connection position of the wiring terminal of each dehumidifier, and the maximum number of dehumidifiers connected is 5; Among them, the head-to-tail connection method: The COMP connection terminal and the 24V AC connection terminal of the user controller are respectively connected to the DHUM connection position and the COM connection position of the wiring terminal of the first dehumidifier. The DEH connection position and the COM2 connection position on the wiring terminal XT of the first dehumidifier are respectively connected to the DHUM connection position and the COM connection position of the wiring terminal of the second dehumidifier, and so on. The maximum number of connected dehumidifiers is greater than 5.

[0006] As a further solution of the present invention: it further includes a switching power supply V, a main control board PCB, and a text screen HMI; The AC input terminal of the switching power supply V is connected in parallel to both ends of the control power supply. The DC output terminal of the switching power supply V is connected in parallel with the power supply interface of the main control board PCB and then connected to the wall-through wiring terminal XT to supply power to the main control board PCB and the text screen HMI. The text screen HMI is connected to the main control board PCB with a 4-core cable for power supply and communication to the text screen HMI; The main control board PCB controls the operation of the compressor to control the AC contactor KM1 and the operation of the fan to control the AC contactor KM2 according to the internal logic, realizing the control of the compressor and the fan. The temperature and humidity sensor B transmits the collected data to the main control board PCB. The main control board PCB controls the operation state of the dehumidifier according to the data and preset parameters, and controls the corresponding output port to act and display an alarm message when an abnormal situation is detected.

[0007] As a further solution of the present invention: when the control circuit is in a head-to-tail connection mode and the linkage function is enabled, the following logic is used for control: Set the forced control enable mode of the dehumidifier to enabled. The forced control enable mode means that the power-on and power-off functions of the text screen and the upper computer are invalid; If the COMP connection terminal and the 24V AC connection terminal of the user controller are closed, and the DHUM connection position and the COM connection position of the wiring terminal of the first dehumidifier detect a closed signal, the compressor and the fan of the first dehumidifier will be started to enter the dehumidification mode. At the same time, the DEH connection position and the COM2 connection position of the wiring terminal of the first dehumidifier output a closed signal; When the DHUM connection position and the COM connection position of the wiring terminal of the second dehumidifier detect the closed signal output by the DEH connection position and the COM2 connection position of the wiring terminal of the first dehumidifier, the compressor and the fan of the second dehumidifier will be started to enter the dehumidification mode. At the same time, the DEH connection position and the COM2 connection position of the wiring terminal of the second dehumidifier output a closed signal; And so on, until the last dehumidifier is reached.

[0008] As a further solution of the present invention: in the case where the control circuit is in a parallel connection mode: If the COMP connection terminal and the 24V AC connection terminal of the user controller are closed, and the DHUM connection position and the COM connection position of all the dehumidifier terminal blocks detect a closed signal, the compressor and the fan of the dehumidifier will be started, and the dehumidification mode will be entered synchronously.

[0009] As a further solution of the present invention: The start time of the fan and the start time of the compressor of each dehumidifier are set at preset time intervals, and the staggered start is realized by setting different start times.

[0010] As a further solution of the present invention: It further includes a temperature and humidity sensor B, and the temperature and humidity sensor B is connected to the main control board PCB temperature input port AI4 and the humidity input port AI5, and is used for the main control board to obtain the current return air temperature and return air humidity data. When the return air humidity exceeds the sum of the humidity preset value and the humidity hysteresis, the main control board PCB controls the compressor output port to be connected, and the compressor starts to run; when the return air humidity drops below the humidity preset value, the main control board PCB controls the compressor output port to be disconnected, and the compressor stops running.

[0011] As a further solution of the present invention: When the return air temperature exceeds the high temperature alarm point and meets the preset duration, a high temperature alarm is carried out, and the main control board PCB controls the compressor output port to be disconnected, and the compressor stops running; after a delay of 15 minutes, if the fault still exists, the main control board PCB controls the fan output port to be disconnected, and the fan stops running.

[0012] As a further solution of the present invention: When the return air temperature is lower than the low temperature alarm point and meets the preset duration, a low temperature alarm is carried out, and the main control board PCB controls the compressor output port to be disconnected, and the compressor stops running; after a delay of 15 minutes, if the fault still exists, the main control board fan control output port is disconnected, and the fan stops running.

[0013] The beneficial effects of the present invention: The linkage of multiple dehumidifiers is realized through a specific wiring method. For example, according to Figure 2 wiring, multi-voltage isolation can be achieved, and countless dehumidifiers can be connected; according to Figure 3 wiring, multiple units can receive signals and start simultaneously. The linkage method can be flexibly selected according to the actual scenario to meet the dehumidification requirements of different-scale spaces, improve the dehumidification efficiency, and reduce the overall energy consumption. For example, in a large warehouse, multiple dehumidifiers can be connected through Figure 2 mode to achieve comprehensive dehumidification; The start time of the fan and the compressor of each dehumidifier can be set separately. The technical effect is to avoid the impact on the power grid caused by the simultaneous start of multiple motor-type loads, ensure the stable operation of the power grid, reduce the loss of the starting current to the equipment itself, and improve the operation reliability of the equipment. In the scenario of centralized start of multiple dehumidifiers, the equipment can be started orderly, reducing the adverse impact on the power grid. Description of the Drawings

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 is a schematic diagram of the overall structure of a linkage control circuit for multiple dehumidifiers in the present invention; Figure 2 is a schematic diagram of the structure of the end-to-end connection method in a linkage control circuit for multiple dehumidifiers of the present invention; Figure 3 is a schematic diagram of the structure of the parallel connection method in a linkage control circuit for multiple dehumidifiers of the present invention. Specific embodiments

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0017] Please refer to Figure 1 As shown, the present invention is a linkage control circuit for multiple dehumidifiers. The control power supply voltage of the dehumidifier can be AC220V, but is not limited to this voltage. The control circuit includes a switching power supply V, a main control board PCB, a text screen HMI, a compressor operation control AC contactor KM1, a fan operation control AC contactor KM2, a temperature and humidity sensor B, and a 10-position wall-through terminal block XT. Among them, the text screen HMI is used as a display for human-computer interaction, and is used to input commands, parameters, and control switches.

[0018] The AC input terminal of the switching power supply V is connected in parallel to both ends of the control power supply. The DC output terminal of the switching power supply V is connected in parallel with the power supply interface of the main control board PCB and then connected to the 10-position wall-through terminal block XT, which is used to supply power to the main control board PCB and the text screen HMI.

[0019] The text screen HMI is connected to the main control board PCB with a 4-core cable, which is used to supply power and communicate with the text screen HMI, facilitating manufacturers and users to adjust parameter settings, as well as switch the dehumidifier, view the current temperature and humidity of the device, view the dehumidifier status information such as fault alarms, etc.

[0020] The compressor operation control AC contactor KM1 is connected to the compressor control output port DO1 of the main control board PCB, which is used for the main control board to control the operation of the compressor according to the internal logic.

[0021] The AC contactor KM2 for controlling the operation of the fan and the thermal protection switch TK of the fan are connected in series to the fan control output port DO2 of the main control board PCB, forming a fan thermal protection circuit. When the operating temperature of the fan exceeds the limit value of the thermal protection switch, the thermal protection switch TK disconnects, causing the fan to stop running; it is used for the main control board to control the operation of the fan according to the internal logic.

[0022] The high-pressure protection switch HP of the refrigeration system is connected to the digital input port DI1 of the main control board PCB. When the main control board detects that the high-pressure protection switch HP of the refrigeration system is disconnected, the main control board will control the compressor output port DO1 to disconnect, thereby shutting down the compressor, and the text screen HMI will display a high-pressure alarm.

[0023] The three-phase monitoring relay KVS, the compressor thermal relay FR1, and the fan thermal relay FR2 are connected in series to the digital input port DI2 of the main control board PCB. When there is a phase loss, phase reversal abnormality in the customer input power supply or the current of the compressor and the fan is too large, the main control board will control the compressor output port DO1 and the fan output port DO2 to disconnect, thereby shutting down the compressor and the fan, and the text screen HMI will display a phase sequence or overload alarm.

[0024] The filter air pressure switch FP is connected to the digital input port DI3 of the main control board PCB. When the main control board detects that the filter air pressure switch FP is disconnected, the text screen HMI will display a filter blockage alarm to remind the user to clean the filter of the dehumidifier.

[0025] The low-pressure protection switch LP of the refrigeration system is connected to the digital input port DI4 of the main control board PCB. When the compressor starts and delays for the low-pressure delay of the compressor, and the main control board detects that the low-pressure protection switch LP of the refrigeration system is disconnected and meets the duration, the main control board will control the compressor output port DO1 to disconnect, thereby shutting down the compressor, and the text screen HMI will display a low-pressure alarm.

[0026] The temperature and humidity sensor B is connected to the temperature input port AI4 and the humidity input port AI5 of the main control board PCB, and is used for the main control board to obtain the current return air temperature and return air humidity data. When the return air humidity exceeds the sum of the humidity setting value and the humidity hysteresis, the main control board compressor control output port is turned on to make the compressor run; when the return air humidity drops below the humidity setting value, the main control board compressor control output port is disconnected to make the compressor stop; when the return air temperature exceeds the high-temperature alarm point and meets the duration, a high-temperature alarm is reported, the main control board compressor control output port is disconnected to make the compressor stop, and after a 15-minute delay, if the fault still exists, the main control board fan control output port is disconnected to make the fan stop; when the return air temperature is lower than the low-temperature alarm point and meets the duration, a low-temperature alarm is reported, the main control board compressor control output port is disconnected to make the compressor stop, and after a 15-minute delay, if the fault still exists, the main control board fan control output port is disconnected to make the fan stop.

[0027] The 10-bit through-wall terminal block XT is connected to the terminal block of the main control board PCB and the DC output of the switching power supply V, facilitating users to connect the float switch, remote controller, 15VDC switching power supply, RS485 communication, and linkage signal without removing the dehumidifier housing.

[0028] The user's float switch can be connected between pin 1 (FLOAT) and pin 4 (COM) of the 10-bit through-wall terminal block XT, and is connected to the input port AI3 of the main control board PCB through internal wiring. When the water in the user's water storage tank is full and the main control board PCB detects that the float switch is disconnected, the compressor control output port DO1 of the main control board will disconnect, causing the compressor to stop and stop generating condensate.

[0029] The dehumidification relay of the user's remote controller can be connected between pin 2 (DHUM) and pin 4 (COM) of the 10-bit through-wall terminal block XT, and is connected to the input port AI1 of the main control board PCB through internal wiring. When the user's remote controller determines to turn on the dehumidification mode and closes the dehumidification relay, and the main control board PCB detects that the dehumidification relay is closed, the compressor control output port DO1 and the fan control output port DO2 of the main control board will be connected, causing the compressor and the fan to operate.

[0030] The ventilation relay of the user's remote controller can be connected between pin 3 (FAN) and pin 4 (COM) of the 10-bit through-wall terminal block XT, and is connected to the input port AI2 of the main control board PCB through internal wiring. When the user's remote controller determines to turn on the ventilation mode and closes the ventilation relay, and the main control board PCB detects that the ventilation relay is closed, the fan control output port DO2 of the main control board will be connected, causing the fan to operate.

[0031] If the user's remote controller is powered by DC15V, it can be connected between pin 5 (+) and pin 6 (-) of the 10-bit through-wall terminal block XT, and takes power from the 15VDC switching power supply through internal wiring.

[0032] The user's host computer MODBUS interface can be connected between pin 7 (A) and pin 8 (B) of the 10-bit through-wall terminal block XT, and is connected to the communication ports A1 and B1 of the main control board PCB through internal wiring. By programming the host computer according to the communication protocol provided by the main control board PCB, functions such as controlling the power on and off of the main control board PCB, obtaining sensor data, operating status, and alarm information of the main control board PCB can be achieved.

[0033] The dehumidification linkage signal is between pin 9 (DEH) and pin 10 (COM2) of the 10-bit through-wall terminal block XT, and is connected to the relay output port DO3 and COM3 / 4 of the main control board PCB through internal wiring. When multiple dehumidifiers are connected end to end, the 2nd pin (DHUM) and 4th pin (COM) of the terminal block XT of the next dehumidifier can be connected.

[0034] As shown Figure 2 In the end-to-end connection method, it includes a user controller, dehumidifier UNIT#1, dehumidifier UNIT#2, and dehumidifier UNIT#3.

[0035] The user controller COMP and 24VAC are respectively connected to the 2nd position (DHUM) and 4th position (COM) of the terminal block of dehumidifier UNIT#1. The 9th position (DEH) and 10th position (COM2) of the terminal block of dehumidifier UNIT#1 are respectively connected to the 2nd position (DHUM) and 4th position (COM) of the terminal block of dehumidifier UNIT#2. The 9th position (DEH) and 10th position (COM2) of the terminal block of dehumidifier UNIT#2 are respectively connected to the 2nd position (DHUM) and 4th position (COM) of the terminal block of dehumidifier UNIT#3.

[0036] To use the linkage function, it is necessary to set the forced control enable mode to "enabled" on the dehumidifier display screen. At this time, the power-on and power-off functions of the text screen and the upper computer are invalid, and the unit is controlled according to the following logic: If the connection between the user controller COMP and 24VAC is closed, and the 2nd position (DHUM) and 4th position (COM) of the terminal block of dehumidifier UNIT#1 detect the closed signal, the compressor and fan of dehumidifier UNIT#1 will be turned on, and it will enter the dehumidification mode. At the same time, the 9th position (DEH) and 10th position (COM2) of the terminal block of dehumidifier UNIT#1 will output a closed signal.

[0037] When the 2nd position (DHUM) and 4th position (COM) of the terminal block of dehumidifier UNIT#2 detect the closed signal from the 9th position (DEH) and 10th position (COM2) of the terminal block of UNIT#1, the compressor and fan of dehumidifier UNIT#2 will be turned on, and it will enter the dehumidification mode. At the same time, the 9th position (DEH) and 10th position (COM2) of the terminal block of dehumidifier UNIT#2 will output a closed signal.

[0038] When the 2nd position (DHUM) and 4th position (COM) of the terminal block of dehumidifier UNIT#3 detect the closed signal from the 9th position (DEH) and 10th position (COM2) of the terminal block of UNIT#2, the compressor and fan of dehumidifier UNIT#3 will be turned on, and it will enter the dehumidification mode. At the same time, the 9th position (DEH) and 10th position (COM2) of the terminal block of dehumidifier UNIT#3 will output a closed signal. Thus, the linkage function of the three dehumidifiers is realized.

[0039] As shown Figure 3 In the parallel connection method: The user controller COMP and 24VAC are respectively connected in parallel with the 2-bit (DHUM) and 4-bit (COM) of the wiring terminals of dehumidifier UNIT#1, and at the same time are connected in parallel with the 2-bit (DHUM) and 4-bit (COM) of the wiring terminals of dehumidifier UNIT#2, and at the same time are connected in parallel with the 2-bit (DHUM) and 4-bit (COM) of the wiring terminals of dehumidifier UNIT#3.

[0040] If the user controller COMP and 24VAC are closed, the 2-bit (DHUM) and 4-bit (COM) of the wiring terminals of dehumidifier UNIT#1 detect the closed signal, the compressor and fan of dehumidifier UNIT#1 will be turned on, and enter the dehumidification mode; at the same time, the 2-bit (DHUM) and 4-bit (COM) of the wiring terminals of dehumidifier UNIT#2 detect the closed signal, the compressor and fan of dehumidifier UNIT#2 will be turned on, and enter the dehumidification mode; at the same time, the 2-bit (DHUM) and 4-bit (COM) of the wiring terminals of dehumidifier UNIT#3 detect the closed signal, the compressor and fan of dehumidifier UNIT#3 will be turned on, and enter the dehumidification mode. Thus, the linkage function of 3 dehumidifiers is realized.

[0041] From Figure 1 it can be seen that the dehumidification relay of the user remote controller is connected between the 2-bit (DHUM) and 4-bit (COM) of the 10-bit through-wall wiring terminal XT, and is connected to the input port AI1 of the main control board PCB through internal wiring; the dehumidification linkage signal is between the 9-bit (DEH) and 10-bit (COM2) of the 10-bit through-wall wiring terminal XT, and is connected to the relay output port DO3 and COM3 / 4 of the main control board PCB through internal wiring. When the two points of the main control board AI1 are open, there is a DC3.3V voltage, but there will be a slight deviation in the voltage of AI1 of each main control board in actual production. If wired according to Figure 3 the wiring, the AI1 of the main control boards of 3 dehumidifiers are connected in parallel together, and there will be a circulating current between different voltages, Figure 3 and this wiring method can connect at most 5 dehumidifiers. If wired according to Figure 2 the wiring, the PCB input ports AI1 of 3 dehumidifiers are not directly connected in parallel, but the relay output port DO3 of the previous one is connected to the AI1 of the next one, and the isolation between multiple voltages is realized. Wired according to Figure 2 the wiring, an infinite number of dehumidifiers can be connected.

[0042] The fan start time and compressor start time of each dehumidifier can be set separately on the display screen. By setting different start times, for example, setting the fan start time of dehumidifier UNIT#1 to 5s, the compressor start time of dehumidifier UNIT#1 to 20s; the fan start time of dehumidifier UNIT#2 to 45s, the compressor start time of dehumidifier UNIT#2 to 20s; the fan start time of dehumidifier UNIT#3 to 85s, the compressor start time of dehumidifier UNIT#3 to 20s. If wired according to Figure 2Or Figure 3 Wiring. When the dehumidifier UNIT#1 detects the closing signal of the user controller, the fan of the dehumidifier UNIT#1 is started after 5s, and the compressor of the dehumidifier UNIT#1 is started after (5 + 20)s; the fan of the dehumidifier UNIT#2 is started after 45s, and the compressor of the dehumidifier UNIT#2 is started after (45 + 20)s; the fan of the dehumidifier UNIT#3 is started after 85s, and the compressor of the dehumidifier UNIT#3 is started after (85 + 20)s. In this way, peak-shifted starting can be achieved to avoid the impact on the power grid when multiple motor-type loads are started simultaneously.

[0043] The above has described an embodiment of the present invention in detail, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A linkage control circuit for multiple dehumidifiers, characterized in that, It includes a user controller, multiple dehumidifiers, and a through-wall terminal block XT; the user controller has COMP and 24V AC connection terminals; the through-wall terminal block XT is provided on each dehumidifier and includes connection positions of FLOAT, DHUM, FAN, COM, DEH, and COM2; The control circuit includes a parallel connection method and a series connection method. Among them, the parallel connection method: The COMP connection terminal and the 24V AC connection terminal on the user controller are respectively connected in parallel with the DHUM connection position and the COM connection position of the terminal block of each dehumidifier, and the maximum number of connected dehumidifiers is 5; Among them, the series connection method: The COMP connection terminal and the 24V AC connection terminal of the user controller are respectively connected to the DHUM connection position and the COM connection position of the terminal block of the first dehumidifier. The DEH connection position and the COM2 connection position on the terminal block XT of the first dehumidifier are respectively connected to the DHUM connection position and the COM connection position of the terminal block of the second dehumidifier, and so on. The maximum number of connected dehumidifiers is greater than 5.

2. The linkage control circuit of multiple dehumidifiers according to claim 1, characterized in that, It also includes a switching power supply V, a main control board PCB, and a text screen HMI; The AC input terminal of the switching power supply V is connected in parallel to both ends of the control power supply. The DC output terminal of the switching power supply V is connected in parallel with the power supply interface of the main control board PCB and then connected to the through-wall terminal block XT to supply power to the main control board PCB and the text screen HMI; the text screen HMI is connected to the main control board PCB with a 4-core cable for power supply and communication to the text screen HMI; The main control board PCB controls the operation of the compressor to control the AC contactor KM1 and the operation of the fan to control the AC contactor KM2 according to the internal logic, realizes the control of the compressor and the fan. The temperature and humidity sensor B transmits the collected data to the main control board PCB. The main control board PCB controls the operation state of the dehumidifier according to the data and preset parameters. When an abnormal situation is detected, it controls the corresponding output port to act and displays an alarm message.

3. The linkage control circuit of multiple dehumidifiers according to claim 2, characterized in that, When the control circuit is in the series connection method and the linkage function is enabled, the control is carried out according to the following logic: Set the forced control enable mode of the dehumidifier to enabled. The forced control enable mode means that the power-on and power-off functions of the text screen and the upper computer are invalid; If the COMP connection terminal and the 24V AC connection terminal of the user controller are closed, and the DHUM connection position and the COM connection position of the terminal block of the first dehumidifier detect a closed signal, the compressor and the fan of the first dehumidifier will be started and enter the dehumidification mode; at the same time, the DEH connection position and the COM2 connection position of the terminal block of the first dehumidifier output a closed signal; When the DHUM connection position and the COM connection position of the terminal block of the second dehumidifier detect the closed signal output by the DEH connection position and the COM2 connection position of the terminal block of the first dehumidifier, the compressor and the fan of the second dehumidifier will be started and enter the dehumidification mode; at the same time, the DEH connection position and the COM2 connection position of the terminal block of the second dehumidifier output a closed signal; And so on, until the last dehumidifier.

4. The linkage control circuit for multiple dehumidifiers according to claim 1, characterized in that, When the control circuit is in the parallel connection method: If the COMP connection terminal and the 24V AC connection terminal of the user controller are closed, and the DHUM connection bit and the COM connection bit of all the dehumidifier wiring terminals detect a closed signal, the compressor and the fan of the dehumidifier will be started, and the dehumidification mode will be entered synchronously.

5. The linkage control circuit of multiple dehumidifiers according to claim 1, characterized in that The start time of the fan and the start time of the compressor of each dehumidifier are set at preset time intervals, and the staggered start is achieved by setting different start times.

6. The linkage control circuit of multiple dehumidifiers according to claim 2, characterized in that, It also includes a temperature and humidity sensor B. The temperature and humidity sensor B is connected to the main control board PCB temperature input port AI4 and the humidity input port AI5, and is used for the main control board to obtain the current return air temperature and return air humidity data. When the return air humidity exceeds the sum of the humidity preset value and the humidity hysteresis, the main control board PCB controls the compressor output port to be connected, and the compressor starts to run; when the return air humidity drops below the humidity preset value, the main control board PCB controls the compressor output port to be disconnected, and the compressor stops running.

7. The linkage control circuit of multiple dehumidifiers according to claim 6, characterized in that, When the return air temperature exceeds the high temperature alarm point and meets the preset duration, a high temperature alarm is issued, and the main control board PCB controls the compressor output port to be disconnected, and the compressor stops running; after a delay of 15 minutes, if the fault still exists, the main control board PCB controls the fan output port to be disconnected, and the fan stops running.

8. The linkage control circuit of multiple dehumidifiers according to claim 6, characterized in that When the return air temperature is lower than the low temperature alarm point and meets the preset duration, a low temperature alarm is issued, and the main control board PCB controls the compressor output port to be disconnected, and the compressor stops running; After a delay of 15 minutes, if the fault still exists, the main control board fan control output port is disconnected, and the fan stops running.

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