JP2017009520A - Electric snow melting device tester and control method for electric snow melting device tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric melting device tester capable of easily diagnosing the failure of an electric melting device and a control method of the electric melting device tester.SOLUTION: The electric snow melting device tester includes: a first control part for causing a display part to display a resistance in which a resistance value corresponding to a temperature to be inspected is set and a temperature corresponding to the resistance value set in the resistance; a second control part for connecting the resistance to an electric melting device control board; an acquisition part for acquiring the temperature measured by a temperature sensor; and a third control part for causing the display part to display the temperature measured by the temperature sensor.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electric snow melter tester and a method for controlling the electric snow melter tester.

  The electric snow melter is operated when the electric snow melter control panel reads the resistance change accompanying the temperature change of the temperature sensor installed in the vicinity of the electric snow melter, and the power is turned on when the resistance value falls below the set value. Automatic control is performed to turn off the power when this occurs. A failure that this automatic control does not operate as set up may occur. In that case, it is necessary to identify the cause of the failure and deal with repairs.

  Patent Document 1 discloses an abnormality monitoring system for a snow melter provided with a control unit that monitors a current flowing through the snow melter and detects an abnormality of the snow melter.

JP2015-94660A

  However, in the abnormality monitoring system described in Patent Document 1, it is possible to detect that an abnormality has occurred in the snow melting device by a control unit provided between the temperature sensor and the snow melting device. is not. When such a failure occurs, it is desirable that it can be easily diagnosed.

  The present invention has been made in view of the above points, and a main object thereof is to provide an electric snow melter tester capable of easily diagnosing a failure of an electric snow melter and a method for controlling the electric snow melter tester. .

  In order to solve the above-described problems, the electric snow melter tester of the present invention displays a resistance in which a resistance value corresponding to the temperature to be inspected is set and the temperature corresponding to the resistance value set in the resistance. A first control unit to be displayed on the unit, a second control unit for connecting the resistance to the electric snow melter control panel, an acquisition unit for acquiring the temperature measured by the temperature sensor, and the temperature sensor And a third control unit for displaying the temperature on the display unit.

  In order to solve the above-mentioned problem, a control method for an electric snow melter tester according to the present invention is a control method for controlling an electric snow melter tester as described above, wherein When receiving an instruction to operate one control unit, the first step of displaying the temperature and operating the second control unit after receiving an instruction to operate the first control unit from the outside When receiving an instruction, except for receiving a second step of connecting the resistor to the electric snow melter control panel, an instruction to operate the first control unit, and an instruction to operate the second control unit from the outside. And a third step of displaying the temperature measured by the temperature sensor when receiving an instruction to operate the third control unit.

  According to the present invention, the temperature is displayed on the electric snowmelter control panel according to the temperature corresponding to the resistance value set by the first control unit and the resistance connected to the electric snowmelter control panel by the second control unit. Is displayed. The user can determine that the electric snow melter control panel is normal when the two temperatures substantially coincide. Further, according to the present invention, the temperature displayed when connected to the temperature sensor and the actual atmospheric temperature (for example, measured using a thermometer) are displayed. The user can determine that the temperature sensor is normal when the two temperatures substantially match. Thus, according to the present invention, it is possible to provide an electric snow melter tester that can easily diagnose a failure of an electric snow melter and a method for controlling the electric snow melter tester.

It is a schematic block diagram of the electric snow melter control system using the electric snow melter tester of this embodiment. It is a figure which shows the characteristic of a temperature sensor. It is a schematic block diagram of the electric snow melter tester of this embodiment.

FIG. 1 is a schematic block diagram of an electric snow melter control system using the electric snow melter tester of the present embodiment. As shown in FIG. 1, the electric snowmelter control system includes PH1 to PH4 as a temperature sensor 1, an electric snowmelter control panel 2, and an electric snowmelter (Point Heater; hereinafter abbreviated as PH).
The temperature sensor 1 is configured by a high-precision resistor, and the resistance value changes as the ambient temperature changes. FIG. 2 is a diagram illustrating the characteristics of the temperature sensor. As shown in FIG. 2, the temperature sensor 1 has a characteristic that the resistance value changes in proportion to a change in temperature.
Returning to FIG. 1, the electric snow melter control panel 2 includes a controller 21 and an electromagnetic contactor 22 (an electromagnetic contactor 22 a and an electromagnetic contactor 22 b). The controller 21 is a device that detects a change in resistance of the temperature sensor 1. When the resistance value of the temperature sensor 1 reaches a predetermined resistance value, the controller 21 outputs an on / off command to turn on or off the PH1 to PH4 to the electromagnetic contactor 22.
The magnetic contactor 22 supplies power to PH1 to PH4 according to an on / off command output from the controller 21.
PH1 to PH4 generate heat by the electric power supplied from the electromagnetic contactor 22, and can melt snow that has fallen on the sleepers of the track.

As described above, in the electric snow melter control system, since the resistance value of the temperature sensor 1 accurately reflects the environmental temperature, the electric snow melter control panel 2 has a temperature in the environment where the temperature sensor 1 is installed. The snow melting operation of PH1 to PH4 can be controlled according to (environment temperature).
Here, the electric snow melter control panel 2 displays a value (converted temperature) obtained by converting the resistance value of the temperature sensor 1 into a temperature, for example, on a built-in display unit. However, when the electric snow melter control panel 2 controls the snow melting operation of PH1 to PH4, there is a problem that the converted temperature displayed on the display unit of the electric snow melter control panel 2 does not match the environmental temperature of the temperature sensor 1. May occur. For example, even if the environmental temperature is 15 ° C., the electric snow melter control panel 2 shows 0 ° C. as the conversion temperature, or even though the environmental temperature is 0 ° C., the electric snow melter control panel 2 shows the conversion temperature. 20 ° C. was sometimes exhibited. The cause of such a malfunction is considered to be, for example, a malfunction of the temperature sensor 1 or a malfunction of the electric snow melter control panel 2. Therefore, in the present embodiment, it is possible to easily diagnose whether the failure is caused by the temperature sensor 1, the electric snow melter control panel 2, or on which side the failure occurs.

In order to make this diagnosis, the electric snow melter tester of this embodiment has a configuration that can be connected to either the temperature sensor 1 or the electric snow melter control panel 2. Then, whether the user (user of the electric snow melter tester 3) can correctly display the temperature when connected to the temperature sensor 1 or can display the temperature correctly when connected to the electric snow melter control panel 2. Judgment (diagnosis) can be made. FIG. 3 is a schematic block diagram of the electric snow melter tester of the present embodiment. The electric snow melter tester 3 includes terminals P0 to P5, a resistance measurement unit 31 (acquisition unit), a variable resistor 32 (resistance), a CPU (Central Processing Unit) 33, and a display unit 34.
As shown in FIG. 3, the electric snow melter tester 3 is connected between the electric snow melter control system shown in FIG. 1 and the temperature sensor 1. Specifically, terminals P 1 to P 3 of the electric snow melter tester 3 are connected to the temperature sensor 1, and terminals P 4 and P 5 of the electric snow melter tester 3 are connected to the electric snow melter control panel 2. The user determines whether or not the temperature sensor 1 is normal by checking the environmental temperature at which the temperature of the temperature sensor 1 connected by the terminals P1 to P3 is displayed. Further, the user determines whether or not the electric snow melter control panel 2 is normal by checking the conversion temperature at which the temperature of the electric snow melter control panel 2 connected by the terminals P4 and P5 is displayed. . When making a determination, the user does not need to connect the electric snow melter tester 3 to both the temperature sensor 1 and the electric snow melter control panel 2, and determines whether the temperature can be correctly displayed by connecting to one of them. After that, it may be determined whether the temperature can be correctly displayed by connecting to the other.
In addition, the electric snow melter tester 3 is a handy type testing device, and when the electric snow melter control panel 2 makes a judgment, it is placed near the electric snow melter control panel 2 and the temperature displayed by the electric snow melter tester 3. And the user can visually recognize both the temperature displayed by the electric snow melter control panel 2. Further, when the temperature sensor 1 is determined, the user can visually recognize both the temperature displayed by the electric snow melter tester 3 and the temperature displayed by the thermometer.

  In response to an instruction from the third control unit 333 in the CPU 33, the resistance measurement unit 31 causes a current to flow from the battery mounted on the electric snow melter tester 3 to the temperature sensor 1, and the voltage between the terminals P1, P2, and P3 at that time, Measure the current. The resistance measuring unit 31 calculates the resistance value of the temperature sensor 1 from the measured voltage and current. The temperature sensor 1 is wired in a three-wire system in the electric snow melter control system, and the electric snow melter control panel 2 forms a bridge circuit to correct errors due to wiring resistance. A resistance value obtained by correcting the wiring resistance by assembling a circuit is obtained. The resistance measurement unit 31 outputs the calculated resistance value of the temperature sensor 1 to the temperature conversion unit 334 of the CPU 33.

  The resistance value of the variable resistor 32 can be set to an arbitrary resistance value. The electric snow melter control panel 2 displays the converted temperature corresponding to the resistance value set in the variable resistor 32. The relationship between the resistance value and the converted temperature is the same as the relationship between the temperature and the resistance value of the resistance / temperature storage unit 335 of the CPU 33 (characteristics of the temperature sensor 1 shown in FIG. 2). That is, the user determines whether or not the temperature corresponding to the resistance value of the variable resistor 32 matches the temperature displayed on the electric snow melter control panel 2 according to the variable resistor 32 connected to the electric snow melter control panel 2. Alternatively, it is determined whether or not the electric snow melter control panel 2 is normal based on whether or not the displayed temperature difference is within a certain error range.

The CPU 33 includes an input unit 330, a first control unit 331, a second control unit 332, a third control unit 333, a temperature conversion unit 334, and a resistance / temperature storage unit 335.
The input unit 330 is connected to the outside of the electric snow melter tester 3 through a terminal P0. When the user inputs an instruction command for instructing which of the first control unit 331, the second control unit 332, and the third control unit 333 to operate to the terminal P0, the input control unit 330 is instructed. Control signals ΦS1, ΦS2, and ΦS3 are output. Note that an input device having a dial type dial corresponding to the terminal P0 and the input unit 330 is configured, and the user rotates the dial knob of the input device, whereby the first control unit 331 and the second control unit 332 are configured. An instruction command for operating any one of the third control units 333 may be input.

The resistance / temperature storage unit 335 stores the characteristics of the temperature sensor 1 shown in FIG.
The resistance value corresponding to the temperature of the temperature sensor 1 stored in the resistance / temperature storage unit 335 is the temperature to be inspected in this embodiment (the converted temperature displayed by the electric snow melter control panel 2, the electric snow melter tester 3). This corresponds to the resistance value corresponding to the environmental temperature indicated by.
The temperature conversion unit 334 refers to the resistance / temperature storage unit 335 for the temperature (environment temperature) corresponding to the resistance value of the temperature sensor 1 calculated by the resistance measurement unit 31 according to an instruction from the third control unit 333. Read and transmit to the third control unit 333.
In addition, the temperature conversion unit 334 converts the temperature (converted temperature) corresponding to the resistance value of the variable resistor 32 determined by the first control unit 331 according to the instruction from the first control unit 331 into the resistance / temperature storage unit 335. Is read out and transmitted to the first control unit 331.

  The display unit 34 is composed of, for example, a liquid crystal panel, and displays the temperature corresponding to the resistance value of the variable resistor 32 determined by the first control unit 331 and the resistance value thereof according to an instruction from the first control unit 331. In addition, the display unit 34 displays the environmental temperature corresponding to the resistance value of the temperature sensor 1 and its resistance value according to an instruction from the third control unit 333.

When the control signal ΦS1 is input from the input unit 330, the first control unit 331 sets an arbitrary resistance value in the variable resistor 32. An arbitrary resistance value set in the variable resistor 32 is input by the user from the terminal P0 or another input terminal (not shown in FIG. 3).
The first control unit 331 causes a current to flow from the battery mounted on the electric snow melter tester 3 to the variable resistor 32 and measures the voltage and current between the variable resistors 32 at that time. The first control unit 331 calculates the resistance value of the variable resistor 32 from the measured voltage and current, makes the calculated resistance value an arbitrary resistance value, and determines the resistance value set for the variable resistor 32. To do. During the operation of the first control unit 331, the CPU 33 performs switching control for switching the connection destination so that the variable resistor 32 and the terminals P4 and P5 are not connected. This connection destination switching control is performed based on an instruction from the input unit 330. This is because when the electric snow melter control panel 2 is operating, the electric snow melter control panel 2 tries to read the resistance value of the variable resistor 32 and supplies current and voltage to the variable resistor 32 via the terminals P4 and P5. This is because it may be difficult for the first control unit 331 to determine the resistance value set in the variable resistor 32. To prevent this, the variable resistor 32 and the terminals P4 and P5 are not connected during the operation of the first control unit 331, that is, the terminals P1 to P3 of the electric snow melter tester 3 are connected to the temperature sensor 1. The state where neither the state nor the state where the terminals P4 and P5 of the electric snow melter tester 3 are connected to the electric snow melter control panel 2 is set.

In addition, the first control unit 331 sends an instruction to the temperature conversion unit 334 after determining the resistance value set in the variable resistor 32. Thereby, the first control unit 331 acquires a temperature corresponding to the determined resistance value of the variable resistor 32. Then, the first control unit 331 causes the display unit 34 to display the temperature corresponding to the determined resistance value of the variable resistor 32 and its resistance value.
Instead of inputting the resistance value set in the variable resistor 32, a temperature corresponding to the resistance value set in the variable resistor 32 may be input. In this case, the first control unit 331 obtains the resistance value corresponding to the input temperature from the resistance / temperature storage unit 335 via the temperature conversion unit 334, and the resistance value obtained by the resistance value of the variable resistor 32. Decide to be.

When the control signal ΦS2 is input from the input unit 330, the second control unit 332 connects the variable resistor 32 to the terminals P4 and P5. At this time, the determination of the resistance value set for the variable resistor 32 executed by the first control unit 331 is completed, and the battery mounted on the electric snow melter tester 3 and the variable resistor 32 are not connected. Thereby, the electric snow melter control panel 2 connected to the electric snow melter tester 3 displays a value (converted temperature) obtained by converting the resistance value of the variable resistor 32 into a temperature. During the operation of the second control unit 332, the CPU 33 performs switching control for switching the connection destination so that the terminals P1 to P3 of the electric snow melter tester 3 are not connected to the temperature sensor 1. This connection destination switching control is performed based on an instruction from the input unit 330.
Here, the electric snow melter control panel 2 according to the temperature corresponding to the resistance value set by the first control unit 331 to the variable resistor 32 and the resistance connected by the second control unit 332 to the electric snow melter control panel 2. The user can determine that the electric snow melter control panel 2 is normal when the converted temperature displayed in (1) substantially matches. In the case of almost coincidence, for example, the converted temperature displayed on the electric snow melter control panel 2 is within an error range determined as 0.5% with reference to the temperature corresponding to the resistance value set in the variable resistor 32, for example. Is the case.
On the other hand, depending on the temperature corresponding to the resistance value set by the first control unit 331 to the variable resistor 32 and the resistance connected by the second control unit 332 to the electric snow melter control panel 2, If the displayed converted temperature does not match or is outside the error range, the user can determine that the electric snow melter control panel 2 is not normal.
The temperature corresponding to the resistance value set in the variable resistor 32 by the first control unit 331 is stored (held) in the CPU 33 after the operation of the first control unit 331, for example, the second control unit 332. And the resistance value of the variable resistor 32 are displayed on the display unit 34.

For example, when the resistance value set for the variable resistor 32 by the first control unit 331 is set to 120Ω in the characteristics of the temperature sensor 1 shown in FIG. 2, 120Ω and 50 ° C. are displayed on the display unit 34. On the other hand, when the electric snow melter control panel 2 is normal, a value of about 50 ° C. corresponding to the variable resistance value 120Ω is displayed on the electric snow melter control panel 2 as a temperature converted value. Here, a negative temperature can be set and confirmed.
As described above, the user connects the electric snow melter tester 3 and the electric snow melter control panel 2 and inputs an instruction to operate the first control unit 331 and an instruction to operate the second control unit 332. It can be determined whether or not the electric snow melter control panel 2 is normal. That is, the electric snow melter control panel 2 is controlled according to the temperature corresponding to the resistance value set by the first control unit 331 to the variable resistor 32 and the resistance connected by the second control unit 332 to the electric snow melter control panel 2. It can be determined whether or not the displayed conversion temperature matches.

When the control signal ΦS3 is input from the input unit 330, the third control unit 333 sends an instruction to the resistance measurement unit 31 and the temperature conversion unit 334 to operate the resistance measurement unit 31 and the temperature conversion unit 334. Further, the third control unit 333 has an environment corresponding to the resistance value of the temperature sensor 1 calculated by the resistance measurement unit 31 and the resistance value of the temperature sensor 1 read from the resistance / temperature storage unit 335 by the temperature conversion unit 334. The temperature is obtained from the temperature conversion unit 334. Further, the third control unit 333 causes the display unit 34 to display the acquired resistance value and temperature. During the operation of the third control unit 333, the CPU 33 performs switching control for switching the connection destination so that the terminals P4 and P5 of the electric snow melter tester 3 are not connected to the electric snow melter control panel 2. This connection destination switching control is performed based on an instruction from the input unit 330.
Here, when the environmental temperature displayed on the display unit 34 when connected to the temperature sensor 1 and the actual ambient temperature (for example, the temperature near the temperature sensor 1 measured using a thermometer) substantially coincide with each other. The user can determine that the temperature sensor 1 is normal. In the case of almost coincidence, for example, the environmental temperature displayed on the display unit 34 when connected to the temperature sensor 1 is within an error range defined as, for example, 0.5% on the basis of the ambient temperature indicated by the thermometer. Is the case.
On the other hand, if the environmental temperature displayed on the display unit 34 when connected to the temperature sensor 1 does not match the ambient temperature indicated by the thermometer, or if it is outside the error range, the temperature sensor 1 is not normal. The user can judge.

For example, when a thermometer near the temperature sensor 1 indicates an ambient temperature of 25 ° C., if the temperature sensor 1 is normal, the resistance value of the temperature sensor 1 calculated by the resistance measurement unit 31 is 110Ω, and the display unit 34 Is displayed as 110Ω and an environmental temperature of 25 ° C. corresponding to 110Ω of the characteristics of the temperature sensor 1 shown in FIG.
Thus, the user can determine whether or not the temperature sensor 1 is normal by connecting the electric snow melter tester 3 and the temperature sensor 1 and inputting an instruction to operate the third control unit 333. . That is, it can be determined whether or not the environmental temperature displayed on the display unit 34 when connected to the temperature sensor 1 matches the ambient temperature indicated by the thermometer.

  As described above, the electric snow melter tester 3 of the present invention displays the variable resistor 32 in which the resistance value corresponding to the temperature to be inspected is set and the temperature corresponding to the resistance value set in the resistance. A first control unit 331 to be displayed on the unit 34, a second control unit 332 for connecting the resistance to the electric snowmelter control panel, and a resistance measurement unit 31 (acquisition unit) for acquiring the temperature measured by the temperature sensor. And a third control unit 333 that causes the display unit 34 to display the temperature measured by the temperature sensor.

  In accordance with the present invention, the electric snow melter depends on the temperature corresponding to the resistance value set by the first control unit 331 to the variable resistor 32 and the resistance connected by the second control unit 332 to the electric snow melter control panel 2. The converted temperature displayed on the control panel 2 is displayed. The user can determine that the electric snow melter control panel 2 is normal when both temperatures substantially coincide. Moreover, the environmental temperature displayed when connected to the temperature sensor 1 and the actual ambient temperature (for example, measured using a thermometer) are displayed. The user can determine that the temperature sensor 1 is normal when the two temperatures substantially match. Thereby, according to this invention, the control method of the electric snow melter tester 3 and the electric snow melter tester 3 which can judge whether the malfunction has arisen in either the temperature sensor 1 or the electric snow melter control panel 2 are provided. be able to.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

For example, in the description of the embodiment, the electric snow melter tester 3 displays the temperature and the resistance value on the display unit 34, but may be configured to display only the temperature. By displaying the resistance value, for example, when the temperature sensor 1 has a defect, it is easier to perform maintenance if the resistance value is present, or there is a failure in the CPU 33 such as when the correspondence between the resistance value and temperature is not achieved. There are advantages such as being able to know.
Further, the electric snow melter tester 3 may be configured to display a failure when a control line connecting the electric snow melter tester 3 and the temperature sensor 1 is short-circuited or disconnected. For example, when the measured resistance value of the temperature sensor 1 is 10Ω or less as the characteristic value of the temperature sensor 1 shown in FIG. 2, it is detected that a short-circuit failure has occurred and displays that there is a short-circuit failure. Good. In addition, when the measured resistance value of the temperature sensor 1 is 3 kΩ or more as the characteristic value of the temperature sensor 1 shown in FIG. 2, it is detected that a disconnection failure has occurred and displays that there is a disconnection failure. Good.

  DESCRIPTION OF SYMBOLS 1 ... Temperature sensor, 2 ... Electric snow melting machine control panel, 3 ... Electric snow melting machine tester, 21 ... Controller, 22, 22a, 22b ... Electromagnetic contactor, 31 ... Resistance measurement part, 32 ... Variable resistance, 33 ... CPU, 34 ... Display unit, 330 ... Input unit, 331 ... First control unit, 332 ... Second control unit, 333 ... Third control unit, 334 ... Temperature conversion unit, 335 ... Resistance / temperature storage unit, P0, P1, P2, P3, P4, P5 ... terminals

Claims (2)

A resistance for which a resistance value corresponding to the temperature to be inspected is set;
A first control unit that causes the display unit to display the temperature corresponding to the resistance value set in the resistor;
A second control unit for connecting the resistor to an electric snow melter control panel;
An acquisition unit for acquiring the temperature measured by the temperature sensor;
A third control unit that causes the display unit to display the temperature measured by the temperature sensor;
An electric snow melter tester comprising: A control method for controlling the electric snow melter tester according to claim 1,
When receiving an instruction to operate the first control unit from the outside of the electric snow melter tester, a first step of displaying the temperature;
A second step of connecting the resistor to an electric snowmelter control panel upon receiving an instruction to operate the second control unit after receiving an instruction to operate the first control unit from the outside;
Measured by the temperature sensor when receiving an instruction to operate the third control unit other than receiving an instruction to operate the first control unit and an instruction to operate the second control unit from the outside A third step of displaying the temperature;
A method for controlling an electric snow melter tester, comprising:

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