Power management system, control panel, and control method for the control panel

Abstract

To maintain control panels simply and inexpensively. [Solution] The first control device 1 includes a control circuit 13 that operates by receiving power from a power line PL via a breaker 11, a contactor 12 electrically connected between the breaker 11 and the control circuit 13, and a switching circuit 14 that opens and closes the contactor 12. When the first condition is met, the control circuit 13 outputs a trigger to the second control device 2, the second control device 2 outputs a power interruption request to the switching circuit 14 in response to the trigger, and the switching circuit 14 outputs an open command to the contactor 12 in response to the power interruption request, thereby interrupting the power supply to the control circuit 14. When the second condition is met after the first condition is met, the second control device 2 outputs a power supply request to the switching circuit 14, the switching circuit 14 outputs a close command to the contactor 12 in response to the power supply request, thereby restarting the power supply to the control circuit 13.

Description

Technical Field

[0001] The present disclosure relates to a power management system, a control panel, and a method for controlling a control panel, and more particularly, to a power management system for a control panel, a control panel, and a method for controlling the power supply of a control panel.

Background Art

[0002] In a power management system, techniques for controlling power supply and interruption have been proposed. For example, Japanese Patent Application Publication No. 2022-544810 (Patent Document 1) discloses a current interruption device using a disconnection line. The power supply device disclosed in Japanese Patent Application Laid-Open No. 2013-258836 (Patent Document 2) ensures safety and reliably prevents contact fusion and the like for various connection and disconnection operations between power supply devices with different potential differences.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, a control panel provided in electrical equipment is configured to receive power supply from a power line. The control panel includes a breaker and a control circuit. The breaker is configured to cut off the power line. The control circuit operates by receiving power supply from the power line via the breaker.

[0005] There is a requirement to temporarily interrupt and then re-enable power to the control circuit for maintenance of the control panel (including the removal of temporary malfunctions). Traditionally, this required a worker to manually operate the circuit breaker. However, dispatching a worker to the site where the electrical equipment is installed is time-consuming and costly.

[0006] This disclosure was made to solve the above-mentioned problems, and one of the purposes of this disclosure is to provide a power management system, a control panel, and a control method for the control panel that enable easy and inexpensive maintenance of the control panel. [Means for solving the problem]

[0007] A power management system according to one aspect of the present disclosure comprises a first control device that receives power from a power line, and a second control device that is communicatively connected to the first control device. The first control device includes a circuit breaker configured to interrupt the power line, a control circuit that operates by receiving power from the power line via the circuit breaker, a switch electrically connected between the circuit breaker and the control circuit, and a switching circuit that opens and closes the switch. When a first condition is met, the control circuit outputs a trigger to the second control device, the second control device outputs a power interruption request to the switching circuit in response to the trigger, the switching circuit outputs an open command to the switch to open the switch in response to the power interruption request, thereby interrupting the power supply to the control circuit. When a second condition is met after the first condition has been met, the second control device outputs a power supply request to the switching circuit, the switching circuit outputs a close command to the switch to close the switch in response to the power supply request, thereby restoring the power supply to the control circuit.

[0008] A control panel according to another aspect of the present disclosure receives power from a power line. The control panel includes a circuit breaker configured to interrupt a power line, a control circuit that operates by receiving power from a power line via the circuit breaker, a switch electrically connected between the circuit breaker and the control circuit, and a switching circuit for opening and closing the switch. When the first condition is met, the switching circuit receives a power interruption request from outside the control panel and, in response to the power interruption request, outputs an open command to the switch to open the switch, thereby interrupting the power supply to the control circuit. When the second condition is met after the first condition is met, the switching circuit receives a power supply request from outside the control panel and, in response to the power supply request, outputs a close command to the switch to close the switch, thereby restoring the power supply to the control circuit.

[0009] A control method for a control panel according to yet another aspect of the present disclosure is a control method for a first control device that receives power from a power line. The first control device includes a circuit breaker configured to interrupt a power line, a control circuit that operates by receiving power from a power line via the circuit breaker, a switch electrically connected between the circuit breaker and the control circuit, and a switching circuit that opens and closes the switch. The control method includes the steps of: outputting a trigger from the control circuit to a second control device when a first condition is met; outputting a power interruption request from the second control device to the switching circuit in response to the trigger; and outputting an open command from the switching circuit to the switch in response to the power interruption request, thereby interrupting the power supply to the control circuit. The control method also includes the steps of: outputting a power supply request from the second control device to the switching circuit when a second condition is met after the first condition is met; and outputting a close command from the switching circuit to the switch in response to the power supply request, thereby restoring the power supply to the control circuit. [Effects of the Invention]

[0010] In a power management system, control panel, and control method for the control panel according to one aspect of this disclosure, when the first condition is met, a trigger is output to the second control device, and a power interruption request from the second control device is output to the switchgear. As a result, the power supply to the control circuit is interrupted. Subsequently, when the second condition is met, a power supply request from the second control device is output to the switchgear. As a result, the power supply to the control circuit is restored. Therefore, the control panel can be maintained simply and inexpensively without workers having to manually operate the breakers. [Brief explanation of the drawing]

[0011] [Figure 1] This is a block diagram showing the overall configuration of the power management system according to Embodiment 1. [Figure 2] This is a circuit block diagram showing in more detail the configuration of the first control device and the second control device in Embodiment 1. [Figure 3] This figure shows an example of the hardware configuration of a control circuit. [Figure 4] This is a sequence diagram showing the processing procedure of the control method for the control panel according to Embodiment 1. [Figure 5] This is a circuit block diagram showing in more detail the configuration of the first control device and the second control device in a modified example of Embodiment 1. [Figure 6] This is a circuit block diagram showing in more detail the configuration of the first control device and the second control device in Embodiment 2. [Figure 7] This is a sequence diagram showing the processing procedure of the control method for the control panel according to Embodiment 2. [Modes for carrying out the invention]

[0012] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated.

[0013] [Embodiment 1] <Overall Structure> FIG. 1 is a block diagram showing the overall configuration of the power management system according to Embodiment 1. The power management system 100 includes electrical equipment 10. The electrical equipment 10 is, for example, power conversion equipment. The electrical equipment 10 includes a first control device 1, a second control device 2, a main circuit 3, and a communication device 4. The power management system 100 further includes a server 5.

[0014] The first control device 1 and the second control device 2 are, for example, installed adjacent to each other. The first control device 1 and the second control device 2 are connected to each other so as to be communicable (typically wired communication). The first control device 1 controls the electrical equipment 10 (typically the main circuit 3). The second control device 2 executes control (described later) regarding the stop / start of the operation of the first control device 1. The configurations of the first control device 1 and the second control device 2 will be described in detail in FIGS. 2 and 3. Note that the first control device 1 corresponds to the "control panel" according to the present disclosure.

[0015] The main circuit 3 includes, for example, a power conversion circuit (such as a switching element using a power semiconductor) and operates according to a command (such as a pulse signal) from the first control device 1. However, the configuration and function of the main circuit 3 are not particularly limited. The main circuit 3 may be, for example, a circuit that controls a power storage device (such as a secondary battery).

[0016] The communication device 4 is configured to communicate bidirectionally with the server 5. Each of the first control device 1 and the second control device 2 can communicate with the server 5 via the communication device 4.

[0017] Server 5 is arranged, for example, in the central monitoring center of an operator who manages electrical equipment 10. Server 5 is configured to be able to remotely monitor and remotely operate electrical equipment 10 by communicating with electrical equipment 10. More specifically, when electrical equipment 10 (the first control device 1 and the main circuit 3) is stopped and the conditions necessary to start electrical equipment 10 are satisfied, Server 5 transmits a start command for starting electrical equipment 10 to the first control device 1. Server 5 periodically receives, for example, an operation report regarding the operation status of electrical equipment 10 (such as sharing of operation parameters during normal operation and reporting of detection of an abnormality) from the first control device 1. Server 5 monitors the operation status of electrical equipment 10 by collecting the operation reports and stores them in the equipment database 51. When electrical equipment 10 is operating and the conditions necessary to stop electrical equipment 10 are satisfied, Server 5 transmits a stop command for stopping electrical equipment 10 to the first control device 1.

[0018] <Configuration of the control panel> FIG. 2 is a circuit block diagram showing in more detail the configurations of the first control device 1 and the second control device 2 in Embodiment 1. Referring to FIGS. 1 and 2, the first control device 1 includes a breaker 11, a contactor 12, a control circuit 13, and an opening / closing circuit 14. The second control device 2 includes a logic circuit 21 and a timer 22.

[0019] The breaker 11 is electrically connected to the power line PL. The breaker 11 is configured to cut off the power line PL when the power line PL is overloaded (such as when the current exceeds the allowable current).

[0020] The contactor 12 is electrically connected between the breaker 11 and the control circuit 13. The contactor 12 is closed (on) or opened (off) according to a command from the opening / closing circuit 14. When the contactor 12 is closed, power is supplied from the power line PL to the control circuit 13 through the breaker 11 and the contactor 12. On the other hand, when the contactor 12 is open, the power supply from the power line PL to the control circuit 13 is cut off.

[0021] The control circuit 13 operates by receiving power from the power line PL via the breaker 11. In this example, the control circuit 13 controls the main circuit 3. However, the control circuit 13 does not necessarily have to have a control function for the main circuit 3.

[0022] Figure 3 shows an example of the hardware configuration of the control circuit 13. The control circuit 13 includes a processor 61, ROM (Read Only Memory) 62, RAM (Random Access Memory) 63, storage 64, and interface 65.

[0023] The processor 61 is an arithmetic processing unit such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit). ROM 62 is a non-volatile memory device. RAM 63 is a volatile memory device such as DRAM (Dynamic Random Access Memory) or SRAM (Static Random Access Memory). Storage 64 is a non-volatile memory device such as an HDD (Hard Disk Drive), SSD (Solid State Drive), or flash memory. Storage 64 stores a system program including the OS (Operating System), a control program including computer-readable code, and various parameters for controlling the first control unit 1. Interface 65 provides the functionality for exchanging signals between the control circuit 13 and other components (main circuit 3, logic circuit 21). The processor 61 performs various arithmetic processing by reading the system program, control program, and parameters from storage 64, loading them into RAM 63, and executing them.

[0024] Although Figure 3 shows an example where the control circuit 13 includes only one processor 61, the control circuit 13 may include multiple processors 61. That is, the control circuit 13 includes one or more processors 61. The control circuit 13 may be divided into multiple components (individual control units) for each function. The same applies to the ROM 62, RAM 63, and storage 64.

[0025] In this disclosure, "processor" is not limited to processors in the narrow sense that execute processing using stored programs, but may also include hardwired circuits such as ASICs (Application Specific Integrated Circuits) and FPGAs (Field-Programmable Gate Arrays). Therefore, the term "processor" can also be interpreted as processing circuitry in which processing is predefined by computer-readable code and / or hardwired circuits.

[0026] Referring again to Figure 2, the switching circuit 14 opens and closes the contactor 12. More specifically, the switching circuit 14 outputs an open command to the contactor 12 to open it. The switching circuit 14 also outputs a close command to the contactor 12 to close it.

[0027] The contactor 12 is preferably a B-contact (normally closed contact) type conductor. This is from the viewpoint of improving the reliability (lifespan and operational continuity) of the electrical equipment 10. Two reasons for this are explained below.

[0028] Firstly, while the electrical equipment 10 is operating, the contactor 12 must be kept closed in order to continue supplying power from the power line PL to the control circuit 13. If the contactor 12 is an A-contact (normally open contact) type, the coil of the contactor 12 must be constantly energized. On the other hand, if the contactor 12 is a B-contact type, the contactor 12 can be kept closed without energizing the coil. Therefore, if the contactor 12 is a B-contact type, the coil excitation time can be shorter compared to the case where the contactor 12 is an A-contact type, thus extending the lifespan of the contactor 12.

[0029] Secondly, if the contactor 12 is a normally closed contact type, even if a malfunction occurs in the contactor 12 and it becomes impossible to control the contactor 12, the contactor 12 will remain in a closed state. Therefore, power can be supplied from the power line PL to the control circuit 13, and the operation of the main circuit 3 can continue.

[0030] Contactor 12 is an example of a "switch" as defined in this disclosure. The "switch" as defined in this disclosure may include all switches that operate electrically (or electromagnetically) (such as relays and contactors).

[0031] The logic circuit 21 of the second control device 2 may be powered by a power line PL common to the control circuit 13 of the first control device 1. Alternatively, the logic circuit 21 may be powered by a power supply from a different path than the control circuit 13 (another power line not shown, an uninterruptible power supply, etc.). The logic circuit 21 receives a signal from the timer 22 indicating the elapsed time. The hardware configuration of the logic circuit 21 of the second control device 2 may be basically the same as the hardware configuration of the control circuit 13. Therefore, a detailed explanation of the hardware configuration of the logic circuit 21 will not be repeated.

[0032] <Processing Procedure> The control circuit 13 can experience both irreversible malfunctions (such as physical damage to hardware) and reversible malfunctions (such as software defects). The control circuit 13 constantly monitors itself and, if any malfunction occurs, can broadly classify the type of malfunction (whether it is reversible or not). In this embodiment, the first control device 1 and the second control device 2 are configured to temporarily stop the control circuit 13 and then restart it (so-called reboot) in order to eliminate (resolve) the malfunction that occurs in the control circuit 13 when a reversible malfunction occurs. The control methods of the first control device 1 and the second control device 2 will be described in detail below.

[0033] Figure 4 is a sequence diagram showing the processing procedure of the control method for the control panel (first control device 1 and second control device 2) according to Embodiment 1. In the figure, from left to right, the processing (operation) performed by the control circuit 13, logic circuit 21, switching circuit 14, and contactor 12 is shown. Each message may be implemented by software processing by each circuit, or by hardware (electrical circuits) arranged within each circuit.

[0034] Referring to Figures 2 and 4, in SQ11, the control circuit 13 outputs a trigger to the logic circuit 21 to start a series of processes when it detects the occurrence of a reversible abnormality in the control circuit 13 (when the abnormality removal condition, which states that the abnormality should be removed, is met). The abnormality removal condition is an example of the "first condition" relating to this disclosure.

[0035] In response to a trigger from the control circuit 13, the logic circuit 21 outputs a power interruption request to the switchgear circuit 14 requesting the interruption of the power supply to the control circuit 13 (SQ12). In response to the power interruption request from the logic circuit 21, the switchgear circuit 14 outputs an open command to the contactor 12 (SQ13). As a result, the contactor 12 is opened (SQ14). Consequently, the power supply from the power line PL to the control circuit 13 is interrupted, and the control circuit 13 stops operating (SQ15).

[0036] The timer 22 of the second control device 2 measures the elapsed time since the logic circuit 21 outputted a power cut-off request and outputs the measured elapsed time to the logic circuit 21. The logic circuit 21 waits until the elapsed time reaches a predetermined time (for example, several tens of seconds to several minutes). When the elapsed time reaches the predetermined time, the logic circuit 21 determines that the condition for resuming power supply to the control circuit 13 has been met. This condition is an example of the "second condition" relating to this disclosure.

[0037] In SQ16, logic circuit 21 outputs a power supply request to switch circuit 14 requesting the resumption of power supply to control circuit 13. Switch circuit 14 responds to the power supply request from logic circuit 21 by outputting a closing command to contactor 12 (SQ17). As a result, contactor 12 is closed (SQ18). Consequently, power supply from power line PL to control circuit 13 is resumed. Control circuit 13 is restarted and resumes operation (SQ19).

[0038] As described above, in Embodiment 1, a trigger from the first control device 1 to the second control device 2 initiates control of the switching circuit 14 by the second control device 2. The second control device 2 outputs a power interruption request to the switching circuit 14, and then outputs a power supply request to the switching circuit 14. In response to the power interruption request, the switching circuit 14 outputs an open command to the contactor 12, and in response to the subsequent power supply request, outputs a close command to the contactor 12. As a result, the contactor 12 is opened and then closed. This interrupts and restarts the power supply from the power line PL to the first control device 1, and the first control device 1 is automatically restarted. Therefore, workers do not need to manually operate the breaker 11. Thus, according to Embodiment 1, the first control device 1 can be maintained simply and inexpensively.

[0039] [Modified example of Embodiment 1] Figure 5 is a circuit block diagram showing in more detail the configuration of the first control device and the second control device in a modified example of Embodiment 1. The first control device 1A in this modified example differs from the first control device 1 in Embodiment 1 (see Figure 2) in that it includes the second control device 2A. This indicates that the second control device 2A is located inside the first control device 1A, in other words, the first control device 1A and the second control device 2A are integrally formed. The first control device 1A and the second control device 2A may be located in the same housing. The second control device 2A may be configured to operate by receiving power from a power line PL.

[0040] The processing procedure for the control methods of the first control device 1A and the second control device 2A in this modified example is the same as the processing procedure shown in the sequence diagram in Figure 4, so no further explanation will be given.

[0041] When a second control device is installed to add a power on / off function to an existing first control device, the second control device 2 may be located outside the first control device 1 (see Figure 2). On the other hand, when the functions of the second control device 2 are to be incorporated into the first control device 1 from the beginning, the first control device 1A and the second control device 2A may be formed integrally, as in this modified example. According to this modified example, the configuration of the first control device and the second control device is simplified compared to the configuration of Embodiment 1. Therefore, the overall size of the electrical equipment 10 can be reduced.

[0042] [Embodiment 2] The trigger source is not limited to the control circuit 13 of the first control device 1. The trigger may be provided from outside the electrical equipment 10.

[0043] Figure 6 is a circuit block diagram showing in more detail the configuration of the first control device 1 and the second control device 2 in Embodiment 2. Embodiment 2 differs from Embodiment 1 (see Figure 2) in that the server 5 outputs the trigger to the second control device 2 instead of the first control device 1.

[0044] As described above, the control circuit 13 periodically sends an operation report regarding the operating status of the electrical equipment 10 to the server 5. The control circuit 13 may also notify the server 5 if it detects that a reversible abnormality has occurred in the control circuit 13. When the server 5 receives such notification from the control circuit 13, it determines that the abnormality removal condition has been met and outputs a trigger to the second control device 2.

[0045] Alternatively, if the periodic operation reports from the control circuit 13 cease, the server 5 may determine that a reversible malfunction may have occurred in the control circuit 13 and that the malfunction removal condition has been met. In this case as well, the server 5 outputs a trigger to the logic circuit 21 of the second control device 2.

[0046] The conditions under which server 5 outputs a trigger are not particularly limited. Server 5 may output a trigger to the second control device 2 according to manual operation by the administrator of server 5 (the person in charge of the business operator managing the electrical equipment 10).

[0047] Figure 7 is a sequence diagram showing the processing procedure of the control method for the control panel according to Embodiment 2. In the figure, from left to right, the processing (operation) performed by the server 5, logic circuit 21, switching circuit 14, contactor 12, and control circuit 13 is shown.

[0048] Referring to Figures 6 and 7, in SQ21, server 5 outputs a trigger to logic circuit 21 when a reversible abnormality occurs in control circuit 13 (when the abnormality removal condition is met).

[0049] The logic circuit 21 outputs a power cut-off request to the switching circuit 14 in response to a trigger from the server 5 (SQ22). The switching circuit 14 outputs an open command to the contactor 12 in response to the power cut-off request from the logic circuit 21 (SQ23). As a result, the contactor 12 is opened (SQ24). Consequently, the power supply from the power line PL to the control circuit 13 is cut off, and the control circuit 13 stops operating (SQ25).

[0050] In SQ26, the logic circuit 21 determines that the conditions for resuming power supply to the control circuit 13 have been met when the elapsed time since outputting the power interruption request reaches a specified time. The logic circuit 21 then outputs a power supply request to the switchgear circuit 14. In response to the power supply request from the logic circuit 21, the switchgear circuit 14 outputs a closing command to the contactor 12 (SQ27). As a result, the contactor 12 is closed (SQ28). Consequently, power supply from the power line PL to the control circuit 13 is resumed, and the operation of the control circuit 13 resumes (SQ29).

[0051] As described above, in Embodiment 2, the control of the switching circuit 14 by the second control device 2 is initiated by a trigger from the server 5 to the second control device 2. As with Embodiment 1, this also interrupts and restarts the power supply from the power line PL to the first control device 1, so the first control device 1 is automatically restarted. Therefore, workers do not need to manually operate the breaker 11. Thus, according to Embodiment 2, the first control device 1 can be maintained simply and inexpensively.

[0052] Embodiment 1 and Embodiment 2 may be combined. That is, the logic circuit 21 of the second control device 2 may be configured to output a power cut-off request to the switching circuit 14 regardless of whether it receives a trigger from the control circuit 13 or the server 5 of the first control device 1.

[0053] A modified configuration of Embodiment 1 (see Figure 5) may also be applied to Embodiment 2. That is, in Embodiment 2 as well, the first control device 1 and the second control device 2 may be integrally formed.

[0054] Although not shown in the diagram, the second control device 2 may be located in a remote location, similar to the server 5. The functions of the second control device 2 (logic circuit 21) may be implemented within the server 5. In this case, instead of the logic circuit 21, power interruption requests and power supply requests may be output from the server 5 to the switching circuit 14.

[0055] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0056] 100 Power management system, 10 Electrical equipment, 1.1A first control unit, 11 Circuit breaker, 12 Contactor, 13 Control circuit, 14 Switching circuit, 2.2A second control unit, 21 Logic circuit, 22 Timer, 3 Main circuit, 4 Communication device, 5 Server, 61 Processor, 62 ROM, 63 RAM, 64 Storage, 65 Interface, PL Power line.

Claims

1. A first control device that receives power from a power line, The system comprises a second control device that is communicatively connected to the first control device, The first control device is A circuit breaker configured to interrupt the aforementioned power line, A control circuit that operates by receiving power from the power line via the aforementioned breaker, A switch electrically connected between the breaker and the control circuit, The circuit includes a switch that opens and closes the switch, If the first condition is met, The control circuit outputs a trigger to the second control device, The second control device outputs a power interruption request to the switching circuit in response to the trigger. The switching circuit, in response to the power interruption request, outputs an open command to the switch to open the switch, thereby interrupting the power supply to the control circuit. If the second condition is met after the first condition is met, The second control device outputs a power supply request to the switching circuit, The switching circuit is a power management system that, in response to the power supply request, outputs a closing command to the switch to close the switch, thereby resuming the power supply to the control circuit.

2. The power management system according to claim 1, wherein the first condition includes the condition that a reversible abnormality in the control circuit has been detected.

3. The power management system according to claim 1, wherein the second condition includes the condition that a specified time has elapsed since the second control device output the power cutoff request.

4. The power management system according to any one of claims 1 to 3, wherein the switch is a normally closed contactor.

5. The power management system according to any one of claims 1 to 3, wherein the second control device is configured to further receive the triggers from a server located outside the first control device and the second control device.

6. The power management system according to any one of claims 1 to 3, wherein the first control device and the second control device are integrally formed.

7. A control panel that receives power from a power line, The aforementioned control panel is A circuit breaker configured to interrupt the aforementioned power line, A control circuit that operates by receiving power from the power line via the aforementioned breaker, A switch electrically connected between the breaker and the control circuit, The circuit includes a switch that opens and closes the switch, When the first condition is met, the switching circuit receives a power cut-off request from outside the control panel, and in response to the power cut-off request, outputs an open command to the switch to open the switch, thereby cutting off the power supply to the control circuit. A control panel wherein, if the second condition is met after the first condition is met, the switching circuit receives a power supply request from outside the control panel, and in response to the power supply request, outputs a closing command to the switch to close the switch, thereby resuming power supply to the control circuit.

8. The control panel according to claim 7, wherein the first condition includes the condition that a reversible malfunction of the control circuit has been detected.

9. The control panel according to claim 7, wherein the second condition includes the condition that a specified time has elapsed since the output of the power cutoff request.

10. The control panel according to any one of claims 7 to 9, wherein the switch is a normally closed contactor.

11. A control method for a control panel, The control panel includes a first control device that receives power from a power line, The first control device is A circuit breaker configured to interrupt the aforementioned power line, A control circuit that operates by receiving power from the power line via the aforementioned breaker, A switch electrically connected between the breaker and the control circuit, The circuit includes a switch that opens and closes the switch, If the first condition is met, The steps include: outputting a trigger from the control circuit to the second control device; In response to the trigger, the second control device outputs a power interruption request to the switching circuit, In response to the power interruption request, the switching circuit outputs an open command to the switch to open the switch, thereby interrupting the power supply to the control circuit. If the second condition is met after the first condition is met, The steps include outputting a power supply request from the second control device to the switching circuit, A control method for a control panel, comprising the steps of: outputting a closing command from the switching circuit to the switch to close the switch in response to the power supply request, thereby restarting the power supply to the control circuit.

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