Electronic device, program product and method

Abstract

An electronic device, a program product, and a method, the electronic device including: a detection unit that detects a size of a noise component superimposed on a metal frame of a device main body; and a processor that, when the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, notifies that the ground wire may not be in a correct connection state.

Description

Technical Field

[0001] The present invention relates to an electronic device, a program product, and a method. The present invention can also be applied to a program and a program product. Background Art

[0002] Patent Document 1 discloses an image forming apparatus that uses a 200V AC power source as a commercial power source for operating the apparatus.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-107866

[0004] In various devices that operate using commercial power supplies, it is sometimes necessary to connect the ground wire of the device body to a Class D ground in order to prevent electric shock to the human body in the event of a leakage. In particular, in electronic devices that use a single-phase 200V AC power supply, since the voltage generated in the event of a leakage also becomes high, it becomes more important to connect the ground wire of the device body to a Class D ground. However, even in the case where the ground wire of the device body is not connected to the Class D ground, the electronic device will operate normally if no leakage occurs. Therefore, it is difficult to determine whether the ground wire of the device body is correctly connected to the Class D ground. In addition, if the ground wire on the main body side is mistakenly connected to the neutral wire of a single-phase three-wire circuit or the ground side circuit of a three-phase three-wire circuit, the voltage to ground of the electronic device may increase due to a phase loss accident of the neutral wire or a poor insulation accident on the power supply equipment side, thereby causing an electric shock accident. Summary of the Invention

[0005] An object of the present invention is to provide an electronic device, a program product, and a method that can determine whether a ground wire of a device body is in a correct connection state.

[0006] An electronic device according to a first aspect of the present invention comprises: a detection unit for detecting the magnitude of a noise component superimposed on a metal frame of a device body; and a processor.

[0007] When the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, the processor notifies that the ground line may not be in a correctly connected state.

[0008] In the electronic device of the first aspect, the processor notifies a predetermined destination that the ground wire may not be correctly connected when the magnitude of the noise component detected by the detection unit exceeds a predetermined threshold.

[0009] According to a third aspect of the present invention, in the electronic device of the first aspect, when the magnitude of the noise component detected by the detection unit exceeds a preset threshold, the processor displays on the operation panel that the ground wire may not be correctly connected.

[0010] In the electronic device of the fourth embodiment of the present invention, in the electronic device of the third embodiment, when the size of the noise component detected by the detection unit exceeds a predetermined threshold value, the processor displays on the operation panel either one or both of the situations in which the ground wire may not be connected and the situation in which the ground wire may be mistakenly connected to the neutral wire of a single-phase three-wire or the ground side circuit of a three-phase three-wire.

[0011] An electronic device according to a fifth aspect of the present invention is the electronic device according to any one of the first to fourth aspects, wherein the detection unit includes:

[0012] 2 wires;

[0013] an amplifier for amplifying the potential difference between the two wires;

[0014] a filter that removes a DC component from the potential difference amplified by the amplifier; and

[0015] The comparator determines whether the potential difference after passing through the filter exceeds a preset threshold voltage.

[0016] An electronic device according to a sixth aspect of the present invention is the electronic device according to the fifth aspect, wherein one of the two electric wires is connected to a metal frame of the device body, and the other electric wire is provided so as to extend along the metal frame.

[0017] A program product according to a seventh aspect of the present invention records a program for causing a computer to execute the following steps: receiving information indicating the magnitude of a noise component detected by a detection unit for detecting the magnitude of a noise component superimposed on a metal frame of a device body; and

[0018] When the magnitude of the noise component included in the received information exceeds a preset threshold, it is notified that the ground line may not be in a correctly connected state.

[0019] The method of an eighth aspect of the present invention includes the steps of: receiving information indicating the magnitude of a noise component detected by a detection unit that detects the magnitude of a noise component superimposed on a metal frame of a device body; and

[0020] When the magnitude of the noise component included in the received information exceeds a preset threshold, it is notified that the ground line may not be in a correctly connected state.

[0021] Effects of the Invention

[0022] According to the electronic device of the first aspect of the present invention, it is possible to determine whether the ground wire of the device body is in a correct connection state.

[0023] According to the electronic device of the second aspect of the present invention, it is possible to notify a person at a remote location that the ground wire of the device body is not in a correctly connected state.

[0024] According to the electronic device of the third aspect of the present invention, it is possible to notify a user who is operating the device that the ground wire of the device body is not in a correctly connected state.

[0025] According to the electronic device of the fourth aspect of the present invention, when the ground wire of the device body is not in the correct connection state, it is possible to specifically notify what the incorrect connection state of the ground wire is.

[0026] According to the electronic device of the fifth aspect of the present invention, the electronic device itself can detect the connection state of the ground line without requiring external measurement.

[0027] According to the electronic device of the sixth aspect of the present invention, it is possible to detect noise components superimposed on the metal frame of the device body without requiring a complicated structure.

[0028] According to the program product of the seventh aspect of the present invention, it is possible to understand whether the ground wire of the device main body is in a correct connection state.

[0029] According to the method of the eighth aspect of the present invention, it is possible to understand whether the ground wire of the device main body is in a correct connection state. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Embodiments of the present invention will be described in detail with reference to the following drawings.

[0031] Figure 1 is a diagram showing a system configuration of an image forming system according to one embodiment of the present invention;

[0032] Figure 2 This diagram shows the correct connection state when using a single-phase three-wire 200V power supply.

[0033] Figure 3 It is used to implement Figure 2 The diagram shows the wiring status of the correct connection state;

[0034] Figure 4 This is a diagram for explaining a ground wire disconnected state as an example of an incorrect connection state when a single-phase three-wire 200V power supply is used;

[0035] Figure 5 This diagram shows an incorrect wiring state when using a single-phase three-wire 200V power supply.

[0036] Figure 6 This means that the socket plug of the image forming device 10 is connected to the Figure 5 FIG 5 is a diagram showing a connection state when the socket 53 is connected in the wiring state shown;

[0037] Figure 7 It means that in Figure 6 The diagram shows the state when a neutral phase loss occurs in the misconnection state.

[0038] Figure 8 This diagram shows the correct connection state when using a three-phase, three-wire, 200V power supply.

[0039] Figure 9 This figure shows an incorrect connection state when using a three-phase three-wire 200V power supply;

[0040] Figure 10 is a block diagram showing the hardware configuration of an image forming apparatus 10 according to one embodiment of the present invention;

[0041] Figure 11 is a block diagram showing the functional configuration of an image forming apparatus 10 according to one embodiment of the present invention;

[0042] Figure 12 Yes Figure 11 FIG. 18 shows a configuration of the noise detection unit 18;

[0043] Figure 13 This is a diagram showing the state of noise superimposed on the metal frame 22 when the ground wire is not correctly connected ( Figure 13 (A)) and a diagram showing the state of noise superimposed on the metal frame 22 when the ground wire is correctly connected ( Figure 13 (B));

[0044] Figure 14 1 is a diagram showing an example of a warning screen displayed on the operation panel 34 when the control unit 33 determines that the ground wire 21 may not be in a correctly connected state.

[0045] Explanation of symbols

[0046] 10-Image forming device, 11-CPU, 12-Memory, 13-Storage device, 14-Communication interface, 15-User interface device, 16-Scanning unit, 17-Image forming unit, 18-Noise detection unit, 19-Control bus, 20-Terminal device, 21-Ground wire, 22-Metal frame, 30-Network, 31, 32-Wires, 33-Control unit, 34-Operation panel, 35-Data transceiver, 40-Internet, 41-Amplifier, 42-Filter, 43-Comparator, 50-Management server, 51-Leakage circuit breaker, 52-Ground terminal, 53-Socket, 54-Ground wiring, 60-100V equipment. DETAILED DESCRIPTION

[0047] Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0048] Figure 1 This is a diagram showing the system configuration of an image forming system according to one embodiment of the present invention.

[0049] like Figure 1 As shown, an image forming system according to one embodiment of the present invention is composed of an image forming device 10 and a terminal device 20 connected to each other via a network 30, and a management server 50 connected to the image forming device 10 via the Internet 40. The terminal device 20 generates print data and transmits the generated print data to the image forming device 10 via the network 30. The image forming device 10 receives the print data transmitted from the terminal device 20 and outputs an image corresponding to the print data on paper. The image forming device 10 is a device known as a multifunction peripheral that has multiple functions such as printing, scanning, copying, and faxing. The management server 50 is a device that is installed at a location different from the location where the image forming device 10 is installed and manages various information of the image forming device 10.

[0050] In various devices that operate using commercial power supplies such as the image forming device 10, it is sometimes necessary to connect the ground wire of the device body to a Class D ground in order to prevent electric shock to the human body when leakage occurs. In particular, in electronic devices that use a single-phase 200V AC power supply, since the voltage generated when leakage occurs also becomes high, it becomes more important to connect the ground wire of the device body to a Class D ground. However, even in the case of an unconnected state where the ground wire of the device body is not connected to the Class D ground, if no leakage occurs, the electronic device will operate normally. Therefore, it is difficult to determine whether the ground wire of the device body is correctly connected to the Class D ground. In addition, in the case where the ground wire on the main body side is mistakenly connected to the neutral wire of a single-phase three-wire or the ground side circuit of a three-phase three-wire, the voltage to the ground of the electronic device may rise due to a phase loss accident of the neutral wire or a poor insulation accident on the power supply equipment side, and an electric shock accident may occur.

[0051] In the following description, Figure 1 The image forming apparatus 10 shown will be described as an apparatus that operates using a single-phase 200V commercial power supply. Figure 2 The figure shows the correct connection state when using a single-phase three-wire 200V power supply.

[0052] exist Figure 2 2 shows a state in which the ground line 21 of the image forming apparatus 10 is correctly connected to the D-type ground, and 200 V between two power lines excluding the neutral line of the single-phase three-wire system is used as the power supply connection.

[0053] In a single-phase three-wire circuit, the neutral line is grounded to Class B ground on the secondary side of the transformer, where the 6600V high voltage is stepped down. This Class B grounding prevents high voltage from being applied to the low voltage side, even if a transformer failure causes a mixture of high and low voltages, causing current from the high voltage side to flow to the low voltage side. This prevents electrical equipment on the low voltage side from malfunctioning. Furthermore, 100V power can be drawn between the neutral line and the two power lines, and 200V power can be drawn between the two power lines.

[0054] If in such Figure 2 In the correct connection state shown, even if leakage occurs in the image forming apparatus 10 and the leakage current flows through the metal frame, when a person touches the metal frame, the leakage current flows to the D-type ground via the ground wire 21, thereby preventing the person from electric shock.

[0055] exist Figure 3 The method for implementing Figure 2 The wiring status shown is the correct connection status. Figure 3 This figure shows the correct wiring when using a single-phase three-wire 200V power supply.

[0056] exist Figure 3 In the circuit, the single-phase three-wire circuit is connected to the leakage circuit breaker 51 of the distribution board, and the two power lines excluding the neutral line are connected to a 200V outlet 53 for connecting to the image forming apparatus 10. In addition, a ground wire 54 is connected to a ground terminal 52 connected to a D-type ground, and this ground wire 54 is connected to the ground terminal of the outlet 53.

[0057] If the socket plug of the image forming apparatus 10 is connected to the socket 53 correctly wired as described above, the following can be achieved: Figure 2 The correct connection status is shown.

[0058] Next, refer to Figures 4 to 7 This section explains incorrect connection conditions when using a single-phase, three-wire, 200V power supply.

[0059] Figure 4 This is a diagram for explaining the ground wire disconnection state as an example of an incorrect connection state when using a single-phase three-wire 200V power supply. Figure 4 In the example, the ground wire 21 is not connected, and thus not connected to the class D ground. Therefore, if leakage occurs in the image forming apparatus 10 and the leakage current flows through the metal frame, if a human body touches the metal frame, the leakage current may flow through the human body and cause electric shock.

[0060] And, in Figure 5 The figure shows an incorrect wiring state when using a single-phase three-wire 200V power supply.

[0061] exist Figure 5 In, with Figure 3 Compared to the correct wiring state shown in FIG. 5 , the grounding wire 54 connected to the grounding terminal of the socket 53 is mistakenly connected to the neutral line of the leakage circuit breaker 51. Figure 6 2 shows a connection state when the socket plug of the image forming apparatus 10 is connected to such a socket 53 . Figure 6 This is a diagram showing another example of an incorrect connection state when a single-phase three-wire 200V power supply is used.

[0062] refer to Figure 6 , it can be seen that the ground wire 21 of the image forming device 10 is incorrectly connected to the neutral wire of the single-phase three-wire system. Such an incorrect connection may cause malfunctions due to noise, etc. In the worst case, due to a phase loss in the neutral wire, the voltage of the metal frame of the image forming device 10 to the ground increases, which may cause electric shock.

[0063] exist Figure 7 As shown in Figure 6 In the incorrect connection state shown, a neutral phase loss occurs.

[0064] refer to Figure 7 , shows a state where, due to a disconnection of the neutral line, a circuit is formed via another 100V device 60 connected between the neutral line and one power line, and a human body that comes into contact with the metal frame of the image forming apparatus 10 is electrocuted.

[0065] Next, a description will be given of a case where a three-phase three-wire 200V power supply is used as the power supply for the image forming apparatus 10. In a three-phase three-wire circuit, one of the three power supply lines is connected to a Class B ground. Figure 8 This diagram shows the correct connection state when using a three-phase, three-wire, 200V power supply. Figure 8 , shows a state where the ground line 21 of the image forming apparatus 10 is connected to a D-type ground, and 200 V between two of the three power lines of the three-phase three-wire is connected as a power source.

[0066] And, in Figure 9 The following shows an incorrect connection state when using a three-phase three-wire 200V power supply. Figure 9 , it can be seen that the ground wire 21 of the image forming device 10 is mistakenly connected to one of the three power lines, which serves as the ground circuit. Even with this incorrect connection, malfunctions due to noise or other factors could occur. In the worst case, insulation defects on the power supply side could cause the metal frame of the image forming device 10 to rise in voltage relative to the ground, potentially resulting in an electric shock.

[0067] Therefore, in the image forming apparatus 10 of the present embodiment, by adopting the following configuration, it is possible to understand whether the ground wire of the apparatus main body is in a correct connection state.

[0068] First, in Figure 10 2 shows the hardware configuration of the image forming apparatus 10 according to the present embodiment.

[0069] like Figure 10 As shown, the image forming apparatus 10 includes a CPU 11, a memory 12, a storage device 13 such as a hard disk drive, a communication interface (IF) 14 for transmitting and receiving data with external devices via a network 30, a user interface (UI) 15 including a touch panel or liquid crystal display and a keyboard, a scanner unit 16, an image forming unit 17, and a noise detector 18. These components are interconnected via a control bus 19.

[0070] The CPU 11 is a processor that controls the actions of the image forming apparatus 10 by executing prescribed processing based on a control program stored in the memory 12 or the storage device 13. In addition, in this embodiment, the case where the CPU 11 reads and executes the control program stored in the memory 12 or the storage device 13 is described, but it is not limited to this. The control program can also be provided in a form recorded in a computer-readable recording medium. For example, the program can be provided in a form recorded in an optical disc such as a CD (Compact Disc)-ROM and a DVD (Digital Versatile Disc)-ROM, or in a semiconductor memory such as a USB (Universal Serial Bus) memory and a memory card. In addition, the control program can also be obtained from an external device via a communication line connected to the communication interface 14. In addition, the control program can be provided as a separate application software, or it can be incorporated into the software of each device as a function of the image forming apparatus 10.

[0071] Figure 111 is a block diagram showing the functional structure of the image forming apparatus 10 realized by executing the above control program. Figure 11 , only the structure related to the function of determining whether the ground wire is in a correct connection state is shown, and the structure related to the functions such as printing, scanning, and copying are omitted.

[0072] like Figure 11 As shown, the image forming apparatus 10 of this embodiment includes a noise detection unit 18 , a control unit 33 , an operation panel 34 , and a data transmission and reception unit 35 .

[0073] The data transmission and reception unit 35 transmits and receives data to and from an external device such as a management server 50 via a network such as the Internet 40 .

[0074] The control unit 33 controls the operation of the image forming apparatus 10 , displays various information for the user on the operation panel 34 , and inputs various operation information performed by the user through the operation panel 34 . The control unit 33 also transmits various information to the management server 50 via the data transceiver 35 .

[0075] Noise detection unit 18 includes two wires 31 and 32, and detects the magnitude of noise components superimposed on the metal frame 22 of the device body. If the magnitude of the noise components detected by noise detection unit 18 exceeds a preset threshold, control unit 33 notifies the user that ground wire 21 may not be properly connected.

[0076] Specifically, when the magnitude of the noise component detected by the noise detection unit 18 exceeds a preset threshold, the control unit 33 displays on the operation panel 34 a message indicating that the ground wire 21 may not be properly connected. For example, when the magnitude of the noise component detected by the noise detection unit 18 exceeds a preset threshold, the control unit 33 displays on the operation panel 34 a message indicating that the ground wire 21 may not be connected, or a message indicating that the ground wire 21 may be mistakenly connected to the neutral wire of a single-phase three-wire system or to the ground-side circuit of a three-phase three-wire system.

[0077] Furthermore, when the magnitude of the noise component detected by the noise detector 18 exceeds a preset threshold, the controller 33 may notify a preset destination, such as the management server 50 , that the ground wire 21 may not be properly connected.

[0078] exist Figure 12 Shown in Figure 11 The structure of the noise detection unit 18 is shown. Figure 12 The noise detection unit 18 includes two electric wires 31 and 32 , an amplifier 41 , a filter 42 , and a comparator 43 .

[0079] Amplifier 41 amplifies the potential difference between two wires 31 and 32. Filter 42 removes a DC component from the potential difference amplified by amplifier 41. Comparator 43 determines whether the potential difference after passing through filter 42 exceeds a preset threshold voltage and sends the determination result to control unit 33.

[0080] In addition, one of the two electric wires 31 and 32 is connected to the metal frame 22 of the device body, and the other electric wire 32 is provided so as to extend along the metal frame 22 .

[0081] Because current flows through the neutral line of a single-phase three-wire system or the ground-side circuit of a three-phase three-wire system, it generates significant noise. In contrast, a ground line connected to a Class D ground generates less noise. Therefore, when ground line 21 is properly connected to a Class D ground, the noise superimposed on the metal frame 22 of the device body is also reduced.

[0082] exist Figure 13 2 shows the state of noise superimposed on the metal frame 22 when the ground wire is not correctly connected and the state of noise superimposed on the metal frame 22 when the ground wire is correctly connected. Figure 13 (A) shows an example of the state of noise superimposed on the metal frame 22 when the ground wire is not correctly connected. It can be seen that the signal level of the noise exceeds the preset threshold value. Figure 13 (B) shows an example of the state of noise superimposed on the metal frame 22 when the ground wire is correctly connected. It can be seen that the signal level of the noise is a level that does not exceed a preset threshold value.

[0083] Therefore, the noise detector 18 detects the magnitude of the noise superimposed on the metal frame 22 of the device body and determines whether the magnitude of the noise exceeds a preset threshold, thereby determining whether the ground wire 21 is properly connected.

[0084] Furthermore, the control unit 33 acquires the determination result from the comparator 43 and determines whether the ground wire 21 is correctly grounded based on, for example, the period during which the noise component exceeds a preset threshold value.

[0085] Furthermore, when it is determined that the ground wire 21 may not be in a correct connection state, the control unit 33 sets the following Figure 14 The warning screen shown is displayed on the operation panel 34 .

[0086] refer to Figure 14, it can be seen that the message "The ground wire may not be correctly connected. Specifically, the following situations are conceivable." is displayed on the operation panel 34. Furthermore, as specific examples of when the ground wire is not correctly connected, the messages "Ground wire not connected." and "The ground wire is mistakenly connected to the neutral line of a single-phase three-wire system or the ground-side circuit of a three-phase three-wire system" are further displayed on the operation panel 34.

[0087] The user who expects to see such a display can check the connection state of the ground wire 21 of the image forming apparatus 10 and notice that the ground wire 21 is not connected or is incorrectly connected.

[0088] In the above embodiments, the processor refers to a processor in a broad sense, including general-purpose processors (such as CPU: Central Processing Unit, etc.) and special-purpose processors (such as GPU: Graphics Processing Unit, ASIC: Application Specific Integrated Circuit, FPGA: Field Programmable Gate Array, programmable logic devices, etc.).

[0089] Furthermore, the operations of the processors in the above embodiments may be performed not only by a single processor but also by a plurality of processors located in physically separate locations working together. Furthermore, the order of the operations of the processors is not limited to that described in the above embodiments and may be modified as appropriate.

[0090] The “system” in this embodiment includes both a system composed of a plurality of devices and a system composed of a single device.

[0091] [Modification]

[0092] In the above embodiment, the image forming apparatus 10 is described as an example of an electronic device connected to and using a ground wire, but the present invention is not limited thereto. As long as it is an electronic device such as a microwave oven, a washing machine, or a refrigerator that is connected to and using a ground wire, the present invention can be similarly applied.

[0093] [Note]

[0094] Hereinafter, aspects of the present invention will be supplementally described. (1)

[0096] An electronic device comprising:

[0097] a detection unit that detects the magnitude of a noise component superimposed on a metal frame of the device body; and

[0098] processor,

[0099] When the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, the processor notifies that the ground line may not be in a correctly connected state. (2)

[0101] The electronic device according to (1), wherein

[0102] When the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, the processor notifies a preset destination that the ground wire may not be in a correctly connected state. (3)

[0104] The electronic device according to (1), wherein

[0105] When the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, the processor displays on the operation panel that the ground wire may not be in a correctly connected state. (4)

[0107] The electronic device according to (3), wherein

[0108] When the size of the noise component detected by the detection unit exceeds a preset threshold, the processor displays on the operation panel either one or both of the situations in which the ground wire may not be connected and the situation in which the ground wire may be mistakenly connected to the neutral line of a single-phase three-wire circuit or the ground side circuit of a three-phase three-wire circuit. (5)

[0110] The electronic device according to any one of (1) to (4), wherein

[0111] The detection unit includes:

[0112] 2 wires;

[0113] an amplifier for amplifying the potential difference between the two wires;

[0114] a filter that removes a DC component from the potential difference amplified by the amplifier; and

[0115] The comparator determines whether the potential difference after passing through the filter exceeds a preset threshold voltage. (6)

[0117] The electronic device according to (5), wherein

[0118] One of the two electric wires is connected to a metal frame of the device body, and the other electric wire is provided so as to extend along the metal frame. (7)

[0120] A program for causing a computer to execute the following steps:

[0121] receiving information indicating the magnitude of a noise component detected by a detection unit that detects the magnitude of a noise component superimposed on a metal frame of a device main body; and

[0122] When the magnitude of the noise component included in the received information exceeds a preset threshold, it is notified that the ground line may not be in a correctly connected state.

[0123] The effects of the configuration according to the supplementary notes will be described below.

[0124] According to the electronic device of (1), it is possible to understand whether the ground wire of the device body is in a correct connection state.

[0125] According to the electronic device of (2), it is possible to notify a person at a remote location that the ground wire of the device body is not in a correctly connected state.

[0126] According to the electronic device of (3), it is possible to notify the user during operation that the ground wire of the device body is not in a correctly connected state.

[0127] According to the electronic device of (4), when the ground wire of the device body is not in a correct connection state, it is possible to specifically notify what the incorrect connection state of the ground wire is.

[0128] According to the electronic device of (5), the electronic device itself can detect the connection state of the ground line without requiring external measurement.

[0129] According to the electronic device of (6), it is possible to detect noise components superimposed on the metal frame of the device body without requiring a complicated structure.

[0130] According to the procedure of (7), it is possible to determine whether the ground wire of the device body is in a correct connection state.

[0131] The above-described embodiments of the present invention are provided for the purpose of illustration and explanation. In addition, the embodiments of the present invention do not fully and exhaustively include the present invention, and do not limit the present invention to the disclosed embodiments. It is obvious that various modifications and variations are self-evident to those skilled in the art to which the present invention belongs. The present embodiment is selected and described in order to most easily explain the principles of the present invention and its application. Thus, other technical personnel in this field can understand the present invention through various modifications optimized for specific uses of the assumed various embodiments. The scope of the present invention is defined by the above claims and their equivalents.

Claims

1. An electronic device comprising: a detection unit that detects the magnitude of a noise component superimposed on a metal frame of the device body; and processor, When the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, the processor notifies that the ground line may not be in a correctly connected state.

2. The electronic device according to claim 1, wherein When the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, the processor notifies a preset destination that the ground wire may not be in a correctly connected state.

3. The electronic device according to claim 1, wherein When the magnitude of the noise component detected by the detection unit exceeds a preset threshold value, the processor displays on the operation panel that the ground wire may not be in a correctly connected state.

4. The electronic device according to claim 3, wherein: When the size of the noise component detected by the detection unit exceeds a preset threshold, the processor displays on the operation panel either one or both of the situations in which the ground wire may not be connected and the situation in which the ground wire may be mistakenly connected to the neutral line of a single-phase three-wire circuit or the ground side circuit of a three-phase three-wire circuit.

5. The electronic device according to any one of claims 1 to 4, wherein: The detection unit includes: 2 wires; an amplifier for amplifying the potential difference between the two wires; a filter that removes a DC component from the potential difference amplified by the amplifier; and The comparator determines whether the potential difference after passing through the filter exceeds a preset threshold voltage. The electronic device according to claim 5 , wherein: One of the two electric wires is connected to a metal frame of the device body, and the other electric wire is provided so as to extend along the metal frame.

7. A program product recording a program for causing a computer to execute the following steps: receiving information indicating the magnitude of a noise component detected by a detection unit that detects the magnitude of a noise component superimposed on a metal frame of a device main body; and When the magnitude of the noise component included in the received information exceeds a preset threshold, it is notified that the ground line may not be in a correctly connected state.

8. A method comprising the steps of: receiving information indicating the magnitude of a noise component detected by a detection unit that detects the magnitude of a noise component superimposed on a metal frame of a device main body; and When the magnitude of the noise component included in the received information exceeds a preset threshold, it is notified that the ground line may not be in a correctly connected state.

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