WO2024052994A1 - Dispositif de sortie de courant analogique, système fa, dispositif de prédiction de rupture, procédé de prédiction de rupture, et programme - Google Patents

Dispositif de sortie de courant analogique, système fa, dispositif de prédiction de rupture, procédé de prédiction de rupture, et programme Download PDF

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WO2024052994A1
WO2024052994A1 PCT/JP2022/033430 JP2022033430W WO2024052994A1 WO 2024052994 A1 WO2024052994 A1 WO 2024052994A1 JP 2022033430 W JP2022033430 W JP 2022033430W WO 2024052994 A1 WO2024052994 A1 WO 2024052994A1
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Prior art keywords
cable
time
resistance value
value
resistance
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PCT/JP2022/033430
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English (en)
Japanese (ja)
Inventor
圭祐 木本
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三菱電機株式会社
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Priority to PCT/JP2022/033430 priority Critical patent/WO2024052994A1/fr
Priority to JP2023508518A priority patent/JP7292550B1/ja
Publication of WO2024052994A1 publication Critical patent/WO2024052994A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity

Definitions

  • the present disclosure relates to an analog current output device, an FA system, a wire breakage prediction device, a wire breakage prediction method, and a program.
  • Patent Document 1 discloses a disconnection prediction device that determines that a cable disconnection is progressing when the measured resistance value of the cable exceeds a predetermined threshold value. has been done.
  • the disconnection prediction device described in Patent Document 1 has a problem in that it can only determine that the cable disconnection is progressing, but cannot predict when the cable will actually disconnect.
  • This disclosure has been made in view of the above circumstances, and aims to predict when a cable will break in the future.
  • an analog current output device outputs an analog current signal obtained by converting a control signal transmitted from a control device to an external device as a control target via a cable.
  • the analog current output device includes a D/A converter that converts input control signals into analog current signals, and an A/D converter that converts analog voltage signals applied to external equipment and cables into digital voltage signals.
  • a resistance value calculation unit that calculates the resistance value of the external device and the cable based on the control signal and the digital voltage signal, and an initial value of the resistance value calculated when the cable is first connected to the external device.
  • the present invention includes a wire breakage time calculation unit that calculates a wire breakage time based on the cable breakage time, and a wire breakage time output portion that outputs the wire breakage time.
  • FIG. 1 A diagram showing a functional configuration of an analog current output device according to Embodiment 1.
  • Block diagram showing the hardware configuration of the analog current output device according to Embodiment 1 A diagram illustrating a display example of a graph image of a resistance value change function according to Embodiment 1.
  • a diagram showing a display example of an input screen according to Embodiment 1 Flowchart of disconnection time output processing according to Embodiment 1
  • a diagram showing the functional configuration of a wire breakage prediction device according to Embodiment 2 Flowchart of replacement time output processing according to Embodiment 2
  • Analog current output device 100 according to Embodiment 1 of the present disclosure is an example of a disconnection prediction device that predicts disconnection of a cable connected to an external load.
  • an analog current output device 100 converts a control signal transmitted from a control device 2 into an analog current signal in an FA system 1 to an external device that is an example of an external load and is a control target. 3 via cable 4.
  • the control signal is, for example, a signal that controls the analog current signal output by the analog current output device 100 using a voltage value.
  • the analog current output device 100 includes a D/A converter 110 that converts a control signal received from the control device 2 into an analog current signal, and an analog voltage signal that is applied to the external device 3 and the cable 4. It includes an A/D converter 120 that converts the voltage into a digital voltage signal.
  • the analog current output device 100 also includes an information control section 130 that controls information, an information storage section 140 that stores information, and an information output section 150 that outputs information. That is, the analog current output device 100 is a computer device including a D/A converter 110 and an A/D converter 120.
  • the information control unit 130 includes a resistance value calculation unit 131 that calculates the resistance values of the external device 3 and the cable 4, a disconnection time calculation unit 132 that calculates the disconnection time when the cable 4 is disconnected, and information regarding calculation of the disconnection time. It includes a calculation-related information acquisition unit 133 that acquires certain calculation-related information.
  • the information storage unit 140 also includes a resistance value storage unit 141 that stores resistance values of the external device 3 and the cable 4, and a calculation-related information storage unit 142 that stores calculation-related information.
  • the information output unit 150 also includes an input screen display unit 151 that displays an input screen 160 (described later) on which the user of the analog current output device 100 inputs calculation-related information, a disconnection time output unit 152 that outputs the disconnection time, and a replacement unit (described later). It includes a replacement time output unit 153 that outputs the time.
  • the analog current output device 100 includes a control section 51 that executes processing according to a control program 59, for example.
  • the control unit 51 includes a CPU (Central Processing Unit).
  • the control unit 51 functions as the information control unit 130 shown in FIG. 2 according to the control program 59.
  • the analog current output device 100 includes a main storage section 52 that loads a control program 59 and is used as a work area for the control section 51.
  • the main storage unit 52 includes a RAM (Random Access Memory).
  • the analog current output device 100 includes an external storage section 53 that stores a control program 59 in advance.
  • the external storage section 53 supplies the data stored by this program to the control section 51 according to instructions from the control section 51, and stores the data supplied from the control section 51.
  • the external storage unit 53 includes a recording medium such as a ROM (Read Only Memory), a flash memory, an HDD (Hard Disk Drive), and an SSD (Solid State Drive).
  • the external storage section 53 functions as the information storage section 140 shown in FIG.
  • the analog current output device 100 includes an operation section 54 operated by the user.
  • the input information is supplied to the control section 51 via the operation section 54 .
  • the operation unit 54 includes information input components such as a keyboard, a mouse, and a touch panel.
  • the analog current output device 100 also includes a display section 55 that displays information input via the operation section 54 and information output from the control section 51.
  • the display unit 55 includes a display device such as an LCD (Liquid Crystal Display) or an OLED (Organic Light Emitting Diode) display.
  • the display section 55 functions as the information output section 150 shown in FIG.
  • the analog current output device 100 includes a transmitting/receiving section 56 that transmits and receives information.
  • the transmitting/receiving unit 56 includes information communication components such as a communication network termination device and a wireless communication device connected to the network.
  • the main storage section 52, external storage section 53, operation section 54, display section 55, and transmission/reception section 56 are all connected to the control section 51 via the internal bus 50. .
  • the analog current output device 100 includes a resistance value calculation step performed by the resistance value calculation unit 131 of the information control unit 130, a disconnection time calculation step performed by the disconnection time calculation unit 132, and a calculation related information acquisition performed by the calculation related information acquisition unit 133. Execute the steps. Further, for example, the analog current output device 100 executes a resistance value storage step performed by the resistance value storage unit 141 of the information storage unit 140 and a calculation related information storage step performed by the calculation related information storage unit 142.
  • the analog current output device 100 also includes an input screen display step performed by the input screen display section 151 of the information output section 150, a disconnection time output step performed by the disconnection time output section 152, and a replacement time output step performed by the replacement time output section 153. Execute the steps.
  • the D/A converter 110 converts the control signal input from the information control unit 130 into digital-to-analog, and outputs an analog current signal from the cable 4 to the external device 3.
  • the A/D converter 120 performs analog-to-digital conversion on an analog voltage signal generated by measuring the voltage applied to the external device 3 and the cable 4, and outputs the digital voltage signal to the information control unit 130.
  • the resistance value calculation unit 131 calculates the resistance values of the external device 3 and the cable 4 based on the control signal input to the D/A converter 110 and the digital voltage signal output from the A/D converter 120. .
  • the resistance value of the external device 3 and the cable 4 refers to the total value of the resistance value of the external device 3 and the resistance value of the cable 4.
  • the resistance value calculation unit 131 calculates the resistance values of the external device 3 and the cable 4 using Ohm's law.
  • the resistance value calculation unit 131 calculates an initial resistance value that is an initial value of the resistance values of the external device 3 and the cable 4 when the cable 4 is first connected to the external device 3.
  • the resistance value calculation unit 131 also calculates a resistance elapsed value which is the resistance value of the external device 3 and the cable 4 after a predetermined period of time, for example, one year has elapsed since the cable 4 was first connected to the external device 3. Calculate.
  • the initial resistance value is Z 0 and the resistance elapsed value is Z 1 .
  • the calculation-related information acquisition unit 133 obtains, as calculation-related information, the initial radius value, length and resistivity, which is the initial value of the radius of the cable 4, the resistance value of the external device 3, and the resistance predetermined by the user, which will be described later. Information including a slope threshold, which is a threshold for the slope of the tangent to the value change function, is acquired.
  • the wire breakage time calculation unit 132 calculates the wire breakage time based on the resistance initial value Z 0 , the resistance elapsed value Z 1 , and the calculation related information.
  • the disconnection time calculation unit 132 calculates the resistance initial value Z 0 , the resistance elapsed value Z 1 , the initial radius value r 0 , the length l, and the resistivity ⁇ of the cable 4 included in the calculation-related information stored in the information storage unit 140.
  • a resistance value change function which is a function indicating the correspondence between the passage of time and a change in resistance value, is specified using the resistance value RL of the external device 3.
  • the resistance value Z of the external device 3 and the cable 4 is calculated by the formula shown in Equation 1 below.
  • the radius elapsed value r1 of the cable 4 is calculated by the following equation 3 based on the equation 2 described above.
  • Equation 4 can be rephrased as a formula for a resistance value change function Z, which is a function indicating the correspondence between the elapsed number of years y and the change in the resistance value Z, as shown in FIG. be able to.
  • Z' is a formula obtained by differentiating the formula of the resistance value change function Z shown in Equation 4 above with respect to the number of elapsed years y, then the differentiated formula Z' [ ⁇ /year] can be expressed as the formula shown in Equation 5 below. Become.
  • Equation 5 the value of the differentiated mathematical expression Z' shown in the above-mentioned Equation 5 can be rephrased as the slope of the tangent to the resistance value change function Z shown in the above-mentioned Equation 4 with respect to the elapsed number of years y.
  • the values shown in FIG. 5 are the values of the resistance value Z and the slope Z' of the tangent line when the number of elapsed years y [years] is 0 to 12 years, calculated from the formulas shown in Equations 4 and 5 above.
  • the wire breakage time calculation unit 132 can calculate the predicted value of the wire breakage time based on the value of the slope Z' of the tangent to the resistance value change function Z. For example, the wire breakage time calculation unit 132 can calculate the elapsed number of years y at which the value of the slope Z' of the tangent to the resistance value change function Z suddenly increases as the wire breakage time. Note that the number of years y is calculated by the following formula shown in Equation 6 based on the above-mentioned Equation 5.
  • the disconnection timing calculation unit 132 calculates the value of the slope Z' of the tangent of the resistance value change function Z to the slope threshold value included in the calculation related information, based on the formula shown in Equation 6 above.
  • a tangent line is specified, and the value of the number of years y and the value of the resistance value Z, which are the points of contact between the tangent line and the resistance value change function Z, are calculated.
  • the slope threshold value is the slope Z' of the tangent to the resistance value change function Z at which the user recognizes that there is a strong possibility that the cable 4 will break and the cable 4 needs to be replaced if it becomes larger than this value.
  • the value of is predetermined by the user.
  • the wire breakage time calculation unit 132 calculates the calculated number of years y as the replacement time, and also calculates the time when a predetermined period, for example, three months has elapsed from the replacement time, as the wire breakage time.
  • the resistance value storage unit 141 stores the calculated resistance value Z. Therefore, the resistance value storage section 141 stores at least the resistance initial value Z 0 and the resistance elapsed value Z 1 . In this embodiment, when the resistance value calculation unit 131 calculates the resistance initial value Z 0 and the resistance elapsed value Z 1 , the resistance value calculation unit 131 stores the resistance initial value Z 0 and the resistance elapsed value Z 1 in the resistance value storage unit 141.
  • the calculation-related information storage unit 142 stores the acquired calculation-related information. Note that in this embodiment, when the calculation-related information acquisition unit 133 acquires the calculation-related information, the calculation-related information storage unit 142 stores the calculation-related information.
  • the input screen display unit 151 displays on the display unit 55 an input screen 160 shown in FIG. 6 in which calculation-related information is input by the user using the operation unit 54.
  • the input screen 160 includes, in order from the top, a radius initial value input field 161 in which the initial radius value r0 of the cable 4 is inputted by the user using the operation unit 54; It includes a length input field 162 in which the length 1 is input, and a resistivity input field 163 in which the resistivity ⁇ of the cable 4 is input.
  • the input screen 160 includes an external device resistance value input field 164 provided below the resistivity input field 163, into which the resistance value RL of the external device 3 is input by the user using the operation unit 54.
  • the input screen 160 includes a slope threshold input field 165 provided below the external device resistance value input field 164, into which a slope threshold predetermined by the user is inputted by the user using the operation unit 54.
  • the wire breakage time output unit 152 outputs the wire breakage time to the user by displaying the wire breakage time calculated by the wire breakage time calculation unit 132 on the display unit 55. Furthermore, the replacement time output unit 153 displays the replacement time calculated by the disconnection time calculation unit 132 on the display unit 55, thereby outputting the replacement time to the user.
  • the wire breakage time output section 152 and the replacement time output section 153 display a graph image of the resistance value change function Z shown in FIG. 4, and display an image indicating the wire breakage time and the replacement time in the graph image. Displays the time of wire breakage and the time of replacement.
  • the resistance value calculation unit 131 calculates the initial resistance of the external device 3 and the cable 4 based on the control signal input to the D/A converter 110 and the digital voltage signal output from the A/D converter 120.
  • a value Z 0 is calculated, and the resistance initial value Z 0 is stored in the resistance value storage unit 141 (step S103).
  • the information control unit 130 determines whether a predetermined period of time, for example, one year, has passed since the resistance value storage unit 141 stored the initial resistance value Z0 (step S104). If the predetermined period has not elapsed (step S104; N), the information control unit 130 repeats the process of step S104 until the predetermined period has elapsed.
  • step S104 when a predetermined period has elapsed (step S104; Y), the resistance value calculation unit 131 of the information control unit 130 outputs a control signal input to the D/A converter 110 and an output from the A/D converter 120.
  • the resistance elapsed value Z1 of the external device 3 and the cable 4 is calculated based on the digital voltage signal, and the resistance elapsed value Z1 is stored in the resistance value storage section 141 (step S105).
  • the wire breakage time calculation unit 132 calculates the wire breakage time and the replacement time based on the resistance initial value Z 0 and resistance elapsed value Z 1 stored in the resistance value storage unit 141 and the calculation related information (step S106). Specifically, the disconnection time calculation unit 132 calculates the resistance initial value Z 0 , the resistance elapsed value Z 1 , the initial radius value r 0 of the cable 4 included in the calculation-related information, the length l, the resistivity ⁇ , and the external device 3
  • the resistance value change function Z shown in Equation 4 above is specified using the resistance value R L of .
  • the wire breakage time calculation unit 132 identifies the tangent line whose slope Z' value of the tangent line of the resistance value change function Z is the slope threshold value included in the calculation related information based on the formula shown in Equation 6 above, and The value of the elapsed years y and the value of the resistance value Z, which are the points of contact between the tangent and the resistance value change function Z, are calculated. Then, the wire breakage time calculation unit 132 calculates the calculated number of years y as the replacement time, and also calculates the time when a predetermined period has elapsed from the replacement time as the wire breakage time.
  • the disconnection time output unit 152 and the replacement time output unit 153 display the disconnection time and replacement time calculated by the disconnection time calculation unit 132 (step S107), and the process ends.
  • the D/A converter 110 converts the control signal input from the control device 2 to the information control section 130 into an analog current signal.
  • the A/D converter 120 converts analog voltage signals applied to the external device 3 and the cable 4 into digital voltage signals.
  • the resistance value calculation unit 131 calculates the resistance value Z of the external device 3 and the cable 4 based on the control signal and the digital voltage signal, and calculates the resistance initial value Z 0 and resistance elapsed value as the calculated resistance value Z.
  • Z 1 is stored in the resistance value storage section 141.
  • the disconnection time calculation unit 132 calculates the disconnection time of the cable 4 based on the resistance initial value Z 0 and the resistance elapsed value Z 1 , and the disconnection time output unit 152 outputs the disconnection time to the user.
  • the analog current output device 100 can predict when the cable 4 will break in the future.
  • the initial resistance value Z 0 when the cable 4 is first connected to the external device 3 and the resistance initial value Z 0 when the cable 4 is first connected to the external device 3 are The breakage timing of the cable 4 can be calculated and output simply by measuring the resistance elapsed value Z1 at a time when a predetermined period has elapsed since the breakage of the cable 4.
  • the analog current output device 100 according to the present embodiment can reduce the workload of predicting cable breakage more than the breakage prediction device described in Patent Document 1.
  • the calculation related information acquisition unit 133 calculates the initial radius r 0 , length l, resistivity ⁇ , and resistance value R L of the external device 3 of the cable 4 . Obtain calculation-related information including. Then, the wire breakage time calculation unit 132 calculates the wire breakage time based on the resistance value change function Z specified using the resistance initial value Z 0 , the resistance elapsed value Z 1 , and the calculation related information. By doing so, the analog current output device 100 according to the present embodiment can predict the disconnection timing of the cable 4 more accurately than an analog current output device or a disconnection prediction device that does not calculate the disconnection timing based on the resistance value change function. Predictable.
  • the calculation related information includes the slope threshold value predetermined by the user. Then, the wire breakage time calculating section 132 calculates the replacement time when the value of the slope Z' of the tangent to the resistance value change function Z becomes the slope threshold value, and the replacement time output section 153 outputs the calculated replacement time. By doing so, the analog current output device 100 according to the present embodiment calculates the replacement time when the value of the slope of the tangent of the resistance value change function becomes the slope threshold value, and the analog current output device or disconnection prediction device that does not output the replacement time. It is possible to predict the breakage time and replacement time of the cable 4 with higher accuracy than the conventional method.
  • the threshold value of the resistance value used for determining whether or not the cable disconnection is progressing is determined by the temperature in the normal state where the disconnection has not progressed. This value is larger than the maximum value of the cable resistance value, excluding changes due to load fluctuation factors and load fluctuation factors. Specifically, the threshold value is set to a value obtained by adding a predetermined value to the initial value of the resistance value of the cable in a normal state.
  • the predetermined value used when setting the threshold value is a value whose basis is unclear, and therefore, the predetermined value used when setting the threshold value is a value whose basis is unclear, so There is a risk that the cable will be determined to have progressed to a disconnection, and there is a risk that the cable will be replaced at a stage where the cable has a much longer lifespan than its actual lifespan.
  • the slope threshold value is determined by the resistance value change function Z at which the user recognizes that there is a sufficient possibility that the cable 4 will break if it becomes larger than this value.
  • the value of the slope Z' of the tangent line is predetermined.
  • the analog current output device 100 capable of predicting the time of wire breakage has been described, but a device other than the analog current output device 100 may be used as long as it is possible to predict the time of wire breakage.
  • the disconnection prediction device 200 according to the second embodiment will be described in detail with reference to FIGS. 8 and 9. Note that in the second embodiment, configurations that are different from those in the first embodiment will be described, and descriptions of the same configurations as in the first embodiment will be omitted because they are redundant.
  • a disconnection prediction device 200 according to Embodiment 2 of the present disclosure is a computer device that predicts disconnection of a cable 4 connected to an external load 30.
  • the disconnection prediction device 200 includes an information control section 130, an information storage section 140, and an information output section 150 similar to those in the first embodiment.
  • the information control section 130 includes a resistance value calculation section 131, a wire breakage time calculation section 132, and a calculation-related information acquisition section 133 similar to those in the first embodiment.
  • the information storage section 140 includes a resistance value storage section 141 and a calculation-related information storage section 142 similar to those in the first embodiment.
  • the information output section 150 includes an input screen display section 151, a disconnection time output section 152, and a replacement time output section 153 similar to those in the first embodiment.
  • the resistance value calculation unit 131 calculates the resistance value Z of the external load 30 and the cable 4 based on the current output from the cable 4 to the external load 30 and the voltage applied to the external load 30 and the cable 4. .
  • the resistance value calculation unit 131 calculates the resistance value Z not only from the resistance initial value Z 0 and the resistance elapsed value Z 1 but also after a predetermined period has elapsed. For example, the resistance value calculation unit 131 calculates the resistance value Z every time a predetermined confirmation period, for example, one month passes.
  • disconnection time calculation unit 132 calculation-related information acquisition unit 133
  • input screen display unit 151 are the same as in the first embodiment by replacing “external device” with “external load” and “3” with “30”. This is an explanation. Therefore, illustrations and detailed descriptions of the wire breakage time calculation section 132, the calculation-related information acquisition section 133, and the input screen display section 151 will be omitted to avoid redundant explanations.
  • the wire breakage time calculation unit 132 calculates the value of the number of years y that has passed and the value of the resistance value Z, which is the point of contact between the broken line and the resistance value change function Z, where the value of the slope Z' is the slope threshold value.
  • the calculated resistance value Z is defined as a resistance threshold value that is a threshold value of the resistance value Z.
  • the resistance threshold Z s is Z s
  • r 0 0.512 ⁇ 10 ⁇ 3
  • l 1000
  • ⁇ 1.72 ⁇ 10 ⁇ 8
  • R L 250
  • c 0.035 ⁇ 10 ⁇ 3
  • y 10.157
  • the replacement time output unit 153 indicates the replacement time by displaying replacement time information, which is information indicating that it is time to replace, when the resistance value Z calculated by the resistance value calculation unit 131 reaches the resistance threshold value Zs . Output.
  • the replacement time output unit 153 may display a text image of “Please replace the cable” on the display unit 55, or output a notification sound from the speaker to notify that it is time to replace the cable. Displays replacement timing information.
  • the resistance value calculation unit 131 calculates initial resistance values of the external load 30 and the cable 4 based on the current output from the cable 4 to the external load 30 and the voltage applied to the external load 30 and the cable 4. Z 0 is calculated, and the resistance initial value Z 0 is stored in the resistance value storage unit 141 (step S113).
  • the information control unit 130 executes the process of step S104, and when a predetermined period of time has elapsed (step S104; Y), the resistance value calculation unit 131 of the information control unit 130 determines that the Based on the current output to the external load 30 and the voltage applied to the external load 30 and the cable 4, the resistance elapsed value Z1 of the external load 30 and the cable 4 is calculated, and the resistance elapsed value Z1 is stored in the resistance value storage section 141. 1 is stored (step S115).
  • the disconnection time calculation unit 132 executes the process of step S106. Note that the specific method for calculating the replacement time and disconnection time in step S106 can be explained in the same manner as in the first embodiment by replacing "external device” with “external load” and "3" with "30". Therefore, detailed explanation will be omitted to avoid redundant explanation.
  • the wire breakage time calculation unit 132 calculates a resistance threshold value that is the value of the resistance value Z at the replacement time (step S116), and the wire breakage time output unit 152 and the replacement time output unit 153 execute the process of step S107. .
  • the information control unit 130 determines whether a predetermined confirmation period, for example, one month, has passed since the resistance value calculation unit 131 calculated the resistance value Z (step S121). If the predetermined confirmation period has not elapsed (step S121; N), the information control unit 130 repeats the process of step S121 until the predetermined confirmation period has elapsed. On the other hand, if the predetermined confirmation period has elapsed (step S121; Y), the resistance value calculation unit 131 of the information control unit 130 calculates the current output from the cable 4 to the external load 30 and the relationship between the external load 30 and the cable 4. The resistance value Z of the external load 30 and the cable 4 is calculated based on the voltage applied to the external load 30 and the cable 4, and the calculated resistance value Z is stored in the resistance value storage unit 141 (step S122).
  • a predetermined confirmation period for example, one month
  • the information control unit 130 determines whether the calculated resistance value Z has reached the resistance threshold (step S123). If the calculated resistance value Z does not reach the resistance threshold value (step S123; N), the information control unit 130 returns to step S121 and repeats the processes of steps 121 to 123 until the calculated resistance value Z reaches the resistance threshold value. . On the other hand, when the calculated resistance value Z reaches the resistance threshold (step S123; Y), the information control unit 130 causes the replacement time output unit 153 to display replacement time information (step S124), and ends the process.
  • the resistance value calculation unit 131 calculates the current output from the cable 4 to the external load 30 and the current applied to the external load 30 and the cable 4.
  • the resistance value Z of the external load 30 and the cable 4 is calculated based on the voltage.
  • the disconnection time calculation unit 132 calculates the disconnection time of the cable 4 based on the resistance initial value Z 0 and the resistance elapsed value Z 1 , and the disconnection time output unit 152 outputs the disconnection time.
  • the calculation related information includes the slope threshold value predetermined by the user. Then, the wire breakage time calculation unit 132 calculates a resistance value at which the value of the slope Z' of the tangent to the resistance value change function Z becomes the slope threshold value as the resistance threshold value, and the replacement time output unit 153 calculates the resistance value calculated by the resistance value calculation unit 131. When the resistance value Z becomes the resistance threshold value, replacement time information is displayed. By doing so, the wire breakage prediction device 200 according to the present embodiment can predict cable breakage more accurately than an analog current output device or a wire breakage prediction device that does not output a replacement time when the calculated resistance value Z reaches the resistance threshold value. It is possible to predict the time of wire breakage and replacement time of 4. In addition, the disconnection prediction device 200 according to the present embodiment has the same effects as the analog current output device 100 according to the first embodiment.
  • the wire breakage time calculation unit 132 calculates the number of years y that has passed, which is the point of contact between the tangent and the resistance value change function Z, where the value of the slope Z' of the tangent to the resistance value change function Z is the slope threshold value.
  • the value of is calculated as the replacement time, it is not limited to this.
  • the wire breakage time calculation unit 132 may calculate the calculated value of the number of years y as the wire breakage time.
  • the wire breakage time calculation unit 132 may calculate a time that is a predetermined period, for example, three months, as the replacement time from the calculated wire breakage time. In this case, the user needs to determine the slope threshold of the tangent to the resistance value change function Z based on the disconnection time rather than the replacement time.
  • the disconnection timing calculation unit 132 calculates the resistance value Z, which is the point of contact between the tangent and the resistance value change function Z, where the value of the slope Z' of the tangent to the resistance value change function Z is the slope threshold value.
  • the value of is calculated as the resistance threshold value depending on the replacement time, the value is not limited to this.
  • the wire breakage time calculation unit 132 may calculate the calculated resistance value Z as a resistance value corresponding to the wire breakage time.
  • the disconnection timing calculation unit 132 may calculate a value obtained by subtracting a predetermined value from the calculated resistance value Z as the resistance threshold value. In this case, the user needs to determine the slope threshold of the tangent to the resistance value change function Z based on the disconnection time rather than the replacement time.
  • the replacement time output unit 153 outputs the replacement time as in the first and second embodiments described above, the user can predict the replacement time by outputting the accurately calculated disconnection time. Therefore, the replacement timing does not need to be output.
  • the replacement time is output when the wire breakage time and the replacement time are calculated, but the replacement time does not have to be output when calculated.
  • the replacement time and the replacement time are output. You can output it when the In this case, the replacement time may be output by displaying the replacement time information as in the second embodiment described above.
  • the analog current output device 100 executes the disconnection timing output process shown in FIG. 7, but the analog current output device 100 executes the disconnection timing output process shown in FIG. Timing output processing may also be executed.
  • the wire breakage prediction device 200 executes the replacement time output process shown in FIG. 9, but the wire breakage prediction device 200 executes the wire breakage time output process shown in FIG. Processing may be executed.
  • the calculation-related information used by the disconnection time calculation unit 132 is information that is first acquired by the calculation-related information acquisition unit 133 and stored in the calculation-related information storage unit 142.
  • the calculation related information may be updatable.
  • the resistance value and slope threshold of the external device 3 or the external load 30 may be updatable.
  • the calculation-related information acquisition unit 133 acquires new calculation-related information, it is necessary to be able to update the calculation-related information stored in the calculation-related information storage unit 142 to new calculation-related information.
  • the main parts that are processed by the analog current output device 100 and the disconnection prediction device 200 which include the control section 51, the main storage section 52, the external storage section 53, the operation section 54, the transmission/reception section 56, and the internal bus 50, are, for example, , a program that executes the above operation is stored and distributed in a recording medium readable by the analog current output device 100 and the disconnection prediction device 200, for example, a flash memory, and the above process is executed by installing the program.
  • the analog current output device 100 and disconnection prediction device 200 may be configured.
  • a program is stored in a storage device of a server device on a communication network such as a LAN or the Internet, and the analog current output device 100 and the disconnection prediction device 200 download the program.
  • Device 200 may be configured.
  • the functions of the analog current output device 100 and the disconnection prediction device 200 are realized by sharing the OS (Operating System) and the application program, or by cooperating with the OS and the application program, only the application program portion is stored on the recording medium. Alternatively, it may be stored in a storage device.
  • OS Operating System
  • the program may be posted on a bulletin board system (BBS) on a communication network and provided via the network. Then, the above process may be executed by starting the program and executing it under the control of the OS in the same way as other application programs.
  • BSS bulletin board system

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

Un convertisseur N/A (110) convertit un signal de commande entré en un signal de courant analogique. Un convertisseur A/N (120) convertit un signal de tension analogique appliqué à un instrument externe (3) et un câble (4) en un signal de tension numérique. Une unité de calcul de valeur de résistance (131) calcule des valeurs de résistance de l'instrument externe (3) et du câble (4) sur la base du signal de commande et du signal de tension numérique, et une unité de stockage de valeurs de résistance (141) stocke au moins des valeurs de résistance initiales. Une unité de calcul de temps de rupture (132) calcule un temps lorsque le câble (4) est susceptible de se rompre sur la base des valeurs de résistance initiales et des valeurs de résistance évoluant dans le temps, et une unité de sortie de temps de rupture (152) délivre le temps de rupture à un utilisateur.
PCT/JP2022/033430 2022-09-06 2022-09-06 Dispositif de sortie de courant analogique, système fa, dispositif de prédiction de rupture, procédé de prédiction de rupture, et programme WO2024052994A1 (fr)

Priority Applications (2)

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PCT/JP2022/033430 WO2024052994A1 (fr) 2022-09-06 2022-09-06 Dispositif de sortie de courant analogique, système fa, dispositif de prédiction de rupture, procédé de prédiction de rupture, et programme
JP2023508518A JP7292550B1 (ja) 2022-09-06 2022-09-06 アナログ電流出力装置、ｆａシステム、断線予測装置、断線予測方法及びプログラム

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PCT/JP2022/033430 WO2024052994A1 (fr) 2022-09-06 2022-09-06 Dispositif de sortie de courant analogique, système fa, dispositif de prédiction de rupture, procédé de prédiction de rupture, et programme

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62288485A (ja) * 1986-06-06 1987-12-15 三菱電機株式会社 ケ−ブル劣化検出装置
JPH01262080A (ja) * 1988-04-12 1989-10-18 Toyota Auto Body Co Ltd 溶接２次ケーブルのケーブル間抵抗計測方法及びその装置並びにその方法を利用した断線予知方法
JPH0523153U (ja) * 1991-09-09 1993-03-26 三菱電機株式会社 自動配線検査装置
JPH11192551A (ja) * 1997-12-26 1999-07-21 Daihen Corp 溶接用の２次ケーブル素線の断線進行予測方法
US20160140836A1 (en) * 2013-05-17 2016-05-19 Minimax Gmbh & Co. Kg Method and device for measuring a line resistance of control lines in hazard warning and control systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62288485A (ja) * 1986-06-06 1987-12-15 三菱電機株式会社 ケ−ブル劣化検出装置
JPH01262080A (ja) * 1988-04-12 1989-10-18 Toyota Auto Body Co Ltd 溶接２次ケーブルのケーブル間抵抗計測方法及びその装置並びにその方法を利用した断線予知方法
JPH0523153U (ja) * 1991-09-09 1993-03-26 三菱電機株式会社 自動配線検査装置
JPH11192551A (ja) * 1997-12-26 1999-07-21 Daihen Corp 溶接用の２次ケーブル素線の断線進行予測方法
US20160140836A1 (en) * 2013-05-17 2016-05-19 Minimax Gmbh & Co. Kg Method and device for measuring a line resistance of control lines in hazard warning and control systems

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