JPH10188715A - Trouble decision device for switch circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trouble decision device for a switch circuit wherein a cause of troubles in the switch circuit is displayed by display combination of a display part. SOLUTION: Voltage (+) fed through a control cable or wiring cable from a control part is fed to a fixed side contact 14b in an input side through a wire 16a and a mounting terminal 15a. A movable side contact 14a, simultaneously with connecting it to the fixed side contact 14b in the input side, is connected also to a fixed side contact 14c in an output side, a switch is turned on. In this way, through a mounting terminal 15b and a wire 16b, voltage V(-) is fed to the control part through the control cable or a wiring cable. Here, the voltage V(+) is fed to a light emitting diode 25 through a resistor 28. By the resistor 28, when input voltage is 70 to 80% prescribed voltage, the light emitting diode 25 in an input side is lighted, in the case of decreasing the input voltage to less than 70% the prescribed voltage, the light emitting diode 25 is put out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure determination device for a switch circuit, and more particularly, to a failure determination device for a switch circuit which displays the cause of failure of the switch circuit by a display combination on a display.

[0002]

2. Description of the Related Art FIG. 8 schematically shows the overall structure of an elevator. As shown in FIG. 8, a machine room 50 is provided on the top floor of the elevator. This machine room 50
A control unit 1 that controls the elevation of the elevator car 2, and a hoist that hoists a main rope 53 (so-called wire rope) connecting the elevator car 2 and the counterweight 54 in accordance with the elevation of the car 2. 51 is provided, and it is further determined whether the rated speed exceeds a predetermined speed in any one of the operation directions of raising and lowering the car 2, and when the speed exceeds the predetermined speed, the hoisting machine 51 is activated. Governor 52 to stop
Is installed. The control unit 1 and the car 2 are electrically connected by a control cable 3.

[0003] An upper final limit switch 4 and a lower final limit switch 5 are mounted near the top floor and the bottom floor of the hoistway, respectively.
The upper final limit switch 4 and the lower final limit switch 5 are provided to prevent the car 2 from traveling too far on the top floor or the lowest floor, and are provided on the car 2. Cam 10
And a switch for stopping the operation of the car 2.

When the car 2 is overspeeded, the governor rope 56 is extended, and the governor rope extension detection switch 7 is operated. As a result, the speed governor 52 operates, the hoisting machine 51 stops, and the elevator of the car 2 stops. However, when the elevator does not stop in the above manner, or when the main rope 53 is cut off, if the rated speed of the elevator 2 at the time of elevator exceeds a predetermined speed, the elevator 2 is attached to the bottom surface of the elevator 2. Emergency stop switch 6
Works. The emergency stop detection switch 6 operates an emergency stop device (not shown), and the emergency stop device grasps the guide rail 55, so that the car 2 is stopped.

On each floor, a landing door hanger 8 having a landing door lock switch is provided, and the car 2 is provided with a car door hanger 9 having a car door locking switch.

[0006] The door lock switch (not shown), the upper final limit switch 4 and the lower final limit switch 5 of the hall are electrically connected to the control unit 1 by a wiring cable 11.

Next, the details of the above-mentioned switch will be described with reference to FIG.

FIG. 9 shows switches used for the above-mentioned upper final limit switch 4, lower final limit switch 5, emergency stop detection switch 6, and governor rope elongation detection switch 7.

The roller 12 is rotatably mounted on one end of a roller mounting arm 13, and the other end of the roller mounting arm 13 is rotatably mounted on a shaft 13a in a switch case. Further, the other end of the roller mounting arm 13 and the switch case are connected by a spring 17.
Accordingly, the roller mounting arm 13 is urged. Further, a stopper 18 for restricting rotation of the roller mounting arm 13 is provided on the upper surface of the switch case.

The fixed contact 14 is fixedly mounted in the switch case. On the other hand, the movable contact 1
4a is attached to the roller attachment arm 13. Furthermore,
The wires 16a and 16b are electrically connected to the control unit 1 (FIG. 8), and the wires 16a and 16b are connected to the fixed contact 14 and the movable contact 14a via attachment terminals 15a and 15b. Thereby, the signal from the control unit 1 is sent to the switch, and the signal from the switch is sent to the control unit 1.
Will be sent to

The operation of the switch shown in FIG. 9 will be described below.

When the car 2 shown in FIG. 8 approaches the upper final limit switch 4 or the lower final limit switch 5, the cam 1 attached to the car 2
9 is engaged with the roller 12 shown in FIG. 9, and the roller 12 is gradually pushed in the direction A while rotating.
a contacts the two fixed contacts 14 on the (+) side and the (-) side, and a current is sent to the control unit 1 (FIG. 8) by an appropriate contact pressure.

When the roller 12 is pressed, the movable contact 1
Although the switch 4a is in contact with the fixed contact 14, the switch may be a switch in which the movable contact and the fixed contact are separated when the roller 12 is pressed.

FIG. 10 shows a configuration of a hanger 8 of a landing door having a door lock switch. Wiring 19
Is branched from the distribution cable 11 (FIG. 8) and connected to the terminal of the fixed side contact 21 of the door lock switch. Therefore, the electric signal from the fixed contact 21 is sent to the control unit 1 (FIG. 8) via the wiring 19 and the wiring cable 11 (FIG. 8). The roller 23 is provided on the hanger 8 that suspends the landing door 24 and rotates according to the opening and closing of the landing door 24. In response to the rotation of the roller 23, the latch 22 of the door closing device is driven. A movable contact 20 of a door lock switch is attached to the latch portion 22.

The operation of the switch shown in FIG. 10 will be described below.

When the car 2 (FIG. 8) arrives at the hall and the hall door 24 is opened, the retractable vanes attached to the car 2 press the rollers 23. Therefore, the latch 22 is unlocked and the movable contact 20 of the door lock switch is released.
Are separated from the fixed side contact 21. Thereby, the door opening signal on this floor is transmitted to the control unit 1 via the wiring 19 and the wiring cable 11.
(FIG. 8).

8 is structurally similar to the switch of FIG. 9 and its function is similar to that of the switch of FIG. 10. Therefore, the description thereof is omitted. Signals from the emergency stop detection switch 6 and the like are sent to the control unit 1 via the control cable 3.

FIG. 11 is an enlarged view of the movable contact 20 and the fixed contact 21 of the door lock switch of FIG.
As shown in FIG. 11, when the movable-side contact 20 short-circuits the two fixed-side contacts 21 on the (+) side and the (-) side, the controller 1
The voltage on the (+) side is sent to (FIG. 8). Thereby, the control unit 1 recognizes that the switch is in the closed state.

[0019]

However, these switches, which are usually used in elevators and escalators, wear the contacts when the number of opening and closing operations of the switches increases, and even when the switches are not worn, the surface of the contacts is worn. Oxidation, dust, and the like may cause contact failure of the contacts. In such a case, there is a possibility that an appropriate voltage cannot be sent to the control unit 1.

For example, when the door lock switch causes a contact failure, it is determined that the car door is not closed because the door lock voltage is not sent to the control unit even though the elevator car door is closed. I do. For this reason, the elevator may not be started. When the upper final limit switch 4, the lower final limit switch 5, the emergency stop detection switch 6, the governor rope extension switch 7, etc., and the escalator safety switch, etc. shown in FIG. And the escalator stops, and cannot be started unless the poor contact condition is recovered.

On the other hand, even if the switch contacts are normal,
The switch itself may be defective. For example, in FIG. 9, the roller 12 comes off, the roller mounting arm shaft 13 a comes off, the stopper 18 comes off, the spring 17 comes off, the wiring mounting terminals 15 a, 15 b loose, and the wiring cable 11 and the control cable 3 become disconnected. In some cases, the signal from the switch is not correctly transmitted to the control unit 1 as described above.

Further, even if the switch is normal and the signal transmission between the switch and the control unit is normal, if the roller 12 is worn out or the mounting dimensions of the switch body are inappropriate, the cam shown in FIG. 10 does not press the roller 12 properly. Therefore, an appropriate contact pressure between the fixed contact 14 and the movable contact 14a cannot be obtained, or the contact is disconnected, and the above-described trouble occurs.

Therefore, in order to prevent these failures during maintenance and inspection, the contact pressure of the switch is regularly checked, the contacts are cleaned and the terminal is tightened. In the event of a failure, the voltage value at the switch terminal is checked. It is necessary to determine the quality of the switch by measuring or measuring the resistance value between the switches via the control unit 1 and the control cable 3.

Further, when a failure occurs, it is difficult to identify the cause of the failure at present, so that all of the above maintenance and inspection work must be performed, and the repair work requires a long time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to detect in advance the deterioration of the function of a switch circuit used in an elevator or an escalator due to various factors, and to identify at a glance the factors that cause a failure. It is an object of the present invention to provide a failure determination device for a switch circuit which can be determined by the following.

[0026]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a failure determination apparatus for a switch circuit according to the present invention has the following features.

(1) In a switch that is energized when the movable contact comes into contact with both fixed contacts of the input terminal fixed contact and the output terminal fixed contact, the input voltage at the input terminal fixed contact is equal to or higher than the input threshold voltage. And an output-side voltage determination display unit that displays whether the output-side voltage at the output terminal-side fixed contact is equal to or higher than an output threshold voltage.

Therefore, for example, the input-side voltage judgment display unit displays that the input-side voltage at the input terminal-side fixed contact is equal to or higher than the input threshold voltage, while the output-side voltage judgment display unit displays the output at the output terminal-side fixed contact. When it is displayed that the side voltage is equal to or lower than the output threshold voltage, it can be seen at a glance that the switch contact has caused a contact failure. In the input-side voltage determination display unit, it is displayed that the input-side voltage at the input terminal-side fixed contact is equal to or lower than the input threshold voltage, and the output-side voltage at the output terminal-side fixed contact is also displayed in the output-side voltage determination display unit. When it is displayed that the voltage is equal to or lower than the output threshold voltage, it can be seen at a glance that the control cable, the wiring cable, and the terminal are loose. On the other hand, in the input-side voltage determination display, it is displayed that the input-side voltage at the input terminal-side fixed contact is equal to or higher than the input threshold voltage, and also in the output-side voltage determination display, the output-side voltage at the output terminal-side fixed contact is displayed. When it is displayed that the output voltage is equal to or higher than the output threshold voltage, it can be seen at a glance from the display that the switch circuit is normal. Therefore, it is possible to identify the cause of the failure in the switch circuit only by visually checking the display states of the input-side voltage determination display unit and the output-side voltage determination display unit.

(2) In the failure determination device for a switch circuit according to the above (1), the input-side voltage determination display section comprises:
The input side voltage at the input terminal side fixed contact turns on when the input side voltage is equal to or higher than the input threshold voltage, and turns off when the input side voltage is lower than the input threshold voltage. The light is turned on as described above, and turned off when the output voltage is lower than the output threshold voltage.

Therefore, it is possible to further identify the cause of the failure of the switch circuit by simply looking at the lighting state of the input-side voltage judgment display section and the output-side voltage judgment display section. For example, when the input-side voltage determination display unit is turned on and the output-side voltage determination display unit is turned off, it can be seen at a glance that the switch contact has caused a contact failure. When the input-side voltage determination display is turned off and the output-side voltage determination display is also turned off, it can be seen at a glance that the control cables, the wiring cables, and the terminals are loose. On the other hand, when the input-side voltage determination display is lit and the output-side voltage determination display is also lit, it can be seen at a glance that the switch circuit is normal.

(3) In a switch which is energized when the movable contact comes into contact with both fixed contacts of the input terminal fixed contact and the output terminal fixed contact, the actual input voltage at the input terminal fixed contact is defined as An input-side comparator that compares the input voltage, an input-side voltage degree display unit that indicates a decrease in the input-side voltage from an output from the input-side comparator, and an actual output-side voltage at the output-terminal-side fixed contact. An output-side comparator for comparing the output-side voltage with a specified output voltage; and an output-side voltage degree display unit for displaying a decrease in the output-side voltage from an output from the output-side comparator.

Therefore, the input-side voltage degree display section and the output-side voltage degree display section display the actual reduction degree of the input / output voltage with respect to the specified input / output voltage, and can recognize the quality of the switch circuit. . This makes it possible to easily determine whether or not maintenance should be performed. Further, a failure point can be specified by a combination of the display on the input side voltage level display section and the display on the output side voltage level display section.

(4) In a switch which is energized when the movable contact comes into contact with both fixed contacts of the input terminal fixed contact and the output terminal fixed contact, the actual input voltage at the input terminal fixed contact is defined as An input-side inverting comparator for comparing the input voltage and inverting the output, an input-side alarm display unit for displaying a decrease in the input-side voltage based on an output from the input-side inverting comparator according to a lighting degree, and the output terminal An output-side inversion comparator that compares the actual output-side voltage at the side-fixed contact with a specified output voltage and inverts the output; and a decrease in the output-side voltage from the output from the output-side inversion comparator, based on the lighting degree. And an output-side alarm display unit for displaying.

Therefore, the input-side alarm display section and the output-side alarm display section indicate the degree of reduction of the input / output voltage in a region between the specified input / output voltage and the threshold input / output voltage, and indicate the degree of pass / fail of the switch circuit. Can be recognized. This makes it possible to easily determine whether or not maintenance should be performed based on the lighting state of the alarm display unit. Further, a failure location can be specified by a combination of the display on the input side alarm display section and the display on the output side alarm display section.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described.

Embodiment 1 FIG. 1 shows a configuration of a first embodiment of a failure determination device for a switch circuit according to the present invention. Note that the same components as those of the conventional switch are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 1, the failure determination apparatus for a switch circuit according to the present embodiment has a small board 27 provided on the side of a conventional switch (for example, shown in FIG. 9).
Is provided with an input-side voltage determination display unit and an output-side voltage determination display unit.

Further, the configuration of the failure determination device for a switch circuit according to the present embodiment will be described in detail with reference to FIG. As shown in FIG. 2, the voltage V transmitted from the control unit 1 (FIG. 8) via the control cable 3 or the distribution cable 11 (FIG. 8).
(+) Is sent to the fixed contact 14b on the input side via the wiring 16a and the mounting terminal 15a. In addition, the movable contact 14
When a is movable, it contacts the fixed contact 14b on the input side and also contacts the fixed contact 14c on the output side, and the switch is turned ON. Thereby, the mounting terminal 15
b, the voltage V (−) is supplied from the control unit 1 (FIG. 8) via the wiring 16b to the control cable 3 or the wiring cable 11 (FIG. 8).
To the control unit 1 (FIG. 8).

Here, the voltage V (+) is sent via a resistor 28 to a light emitting diode 25 which is an input side voltage judgment display section. The resistor 28 has an input voltage of 70 to 70
At 80%, the input side light emitting diode 25 is turned on, and when the input voltage falls below 70% of the predetermined voltage V, the light emitting diode 25 is turned off.

Therefore, for example, when the control cable 3 on the input side or the wiring 16a on the input side is broken, or when the mounting terminal 15a on the input side becomes loose, the mounting terminal 1 on the input side is disconnected.
Since the input voltage between 5a and the fixed contact 14b on the input side drops to less than 70% of the predetermined voltage V, the light emitting diode 25 is turned off. Thus, it can be seen at a glance that the switch circuit has failed due to the above factors.

The output light emitting diode 26 is turned on when the output voltage between the fixed contact 14c on the output side and the mounting terminal 15b on the output side is 70% or more of the predetermined voltage V. The resistance 29 is adjusted so as to turn off the light when it falls to less than 70%.

Accordingly, for example, when the movable contact 14a is in poor contact with the fixed contact 14b and / or the fixed contact 14c, or when the switch itself is defective, the switch mounting dimensions are inappropriate and the cam 10 For example, when the amount of pushing the roller 12 is small, the light emitting diode 26 is turned off.

Further, even if both of the light emitting diodes 25 and 26 are lit, if the predetermined voltage is not transmitted to the control unit 1 (FIG. 8), the output-side mounting terminal 15b
It is evident that the cause is looseness of the wire or disconnection of the wiring 16b or the output side of the control cable 3.

As described above, according to the failure determination device for a switch circuit of this embodiment, it is possible to determine at a glance whether or not the voltage input to and output from the switch is good, so that it is not necessary to perform unnecessary work in maintenance and inspection. Further, even at the time of failure, the cause can be seen at a glance by the combination of the lighting states of the light emitting diodes 25 and 26, so that the repair work time can be shortened.

The light emitting diode 2 used in the present embodiment
Since the resistors 5 and 26 operate with a smaller current than the predetermined voltage V, the resistors 28 and 29 have a larger resistance value than the predetermined voltage V. Therefore, the fixed contacts 14b and 14c and the movable contacts 14a and the control unit 1 are controlled by the small substrate 27.
(FIG. 8).

FIG. 3 shows a failure determination device for a switch circuit for displaying the state of input / output voltage on a door lock switch of a landing door. The failure determination device for the switch circuit provided in the door lock switch of the landing door also has the structure shown in FIG.

Therefore, as described above, when the light emitting diode 25 on the input side is turned off, the wiring cable 1
1 (FIG. 8) or disconnection of the input side of the wiring 19 or loosening of the mounting terminal on the input side. Further, the light emitting diode 25 on the input side is turned on, and the light emitting diode 2 on the output side is turned on.
When the switch 6 is turned off, the movable contact 20 and the fixed contact 21 are defective because the contact between the movable contact 20 and the fixed contact 21 is defective, the switch itself is defective, and the mechanical setting dimensions of the latch 22 are inappropriate. It can be seen that the cause is that the contact pressure of No. 21 became defective. Furthermore, the control unit 1 (FIG. 8) is used when both the light emitting diodes 25 and 26 are lit.
If the predetermined voltage is not sent to the power supply, it is determined that the cause is loosening of the output-side mounting terminal or disconnection of the output side of the wiring cable 11 (FIG. 8) or the wiring 19.

Embodiment 2 FIG. 4 shows a failure determination device for a switch circuit according to a second embodiment of the present invention.
Note that the same components as those of the conventional switch and the failure determination device for the switch circuit according to the first embodiment of the present invention are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 4, the small substrate 32 is provided with an input-side voltage level display section 30 and an output-side voltage level display section 31 each composed of a series of a plurality of light emitting diodes.

Further, a failure determination device for a switch circuit according to the present embodiment will be described in detail with reference to FIG. Voltage V (+)
Is sent to the input side comparator 34 via the resistor 33.
The input-side comparator 34 compares the actually transmitted input-side voltage at the input-terminal-side fixed-side contact 14b with a prescribed input voltage, and determines the number of light emitting diodes corresponding to the magnitude of the actually transmitted input voltage. 30n are turned on. For example, when the input voltage between the input-side mounting terminal 15a and the input-side fixed contact 14b is a predetermined voltage V, all of the light emitting diodes 30a, 30b, ..., 30n are turned on. On the other hand, when the input voltage is V / 2, a series of halves on the right end of the light emitting diodes 30a, 30b,.

In the output-side voltage degree display section 31,
The plurality of light emitting diodes 31a, 31b,..., 31n corresponding to the magnitude of the output voltage from the comparator 36 are turned on. The light emitting diodes 31a, 31b, ..., 31
The lighting of the light emitting diode 30a, 3
0b,..., 30n.

The causes of failure that can be seen from the lighting state of the input-side voltage level display section 30 and the output-side voltage level display section 31 are the same as in the first embodiment described above, and a description thereof will be omitted. The resistors 33 and 35 are connected to the first
Like the resistors 28 and 29 in the embodiment, the input / output voltage is appropriately adjusted and sent to the light emitting diode.

As described above, according to the failure determination apparatus for a switch circuit of the present embodiment, the input-side voltage level display section 30 and the output-side voltage level display section 31 reduce the actual input / output voltage with respect to the specified input / output voltage. Since the degree is displayed, the quality of the switch circuit can be determined at a glance during maintenance,
Further, at the time of repair, whether or not repair is required can be easily determined from the lighting state of the light emitting diode. Further, an input side voltage level display section 30 and an output side voltage level display section 31
The failure location can be specified by the combination of the lighting of.

Embodiment 3 FIG. FIG. 5 shows a failure determination device for a switch circuit according to a third embodiment of the present invention.
Note that the same components as those of the conventional switch and the failure determination devices for the switch circuits according to the first and second embodiments of the present invention are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 5, the small board 39 is provided with an input-side alarm display section 37 and an output-side alarm display section 38 comprising a series of a plurality of light emitting diodes.

Further, a failure determination device for a switch circuit according to the present embodiment will be described in detail with reference to FIG. Voltage V (+)
Is sent to the input-side inversion comparator 41 via the resistor 40. The input-side inverting comparator 41 is connected to the fixed contact 14 on the input side.
The input voltage actually sent at b is compared with a specified input voltage, and the output is inverted. Therefore, the plurality of light emitting diodes 37a, 37b,..., 37n are lit in a region between the prescribed input voltage and the threshold input voltage according to the output from the input-side inversion comparator 41. Thus, the input-side alarm display section 37 lights and displays the degree of decrease in the input / output voltage. For example, the input side mounting terminal 15a
When the input voltage between the input-side fixed contact 14b and the input-side fixed contact 14b drops below 70% of the predetermined voltage V, that is, when the input voltage drops below the threshold input voltage, the light emitting diode 37
, 37n are all turned on. on the other hand,
When the input voltage is 70% or more of the predetermined voltage V, all the lights are turned off. Therefore, when the voltage drops for some reason, the light emitting diodes 37a, 37b,..., 37n of the input-side alarm display section 37 are turned on at the same time and function as an alarm.

Similarly, the output side inversion comparator 43 compares the actual output voltage from the output terminal side fixed side contact 14c with a prescribed input voltage, and inverts the output. Accordingly, the plurality of light emitting diodes 38a, 38b,..., 38n are lit in a range between the prescribed output voltage and the threshold output voltage according to the output from the output side inverting comparator 43. Thus, the output side alarm display section 38 lights and displays the degree of decrease in the output voltage. The light emitting diode 38
, 38n are illuminated in the same manner as the light emitting diodes 37a, 37b,.

The causes of failure that can be determined from the lighting states of the input-side alarm display section 37 and the output-side alarm display section 38 are the same as in the first embodiment described above, and a description thereof will be omitted. Further, the resistors 40 and 41 adjust the input / output voltage appropriately similarly to the resistors 28 and 29 in the above-described first embodiment, and send the voltages to the light emitting diodes.

As described above, according to the switch circuit failure judging device of the present embodiment, the input-side alarm display section 37 and the output-side alarm display section 38 display the area between the specified input / output voltage and the threshold input / output voltage. , The degree of reduction of the input / output voltage is displayed, so that the quality of the switch circuit can be determined at a glance at the time of maintenance and inspection, and the degree of failure can be easily determined from the lighting state of the light emitting diode at the time of repair. Further, a failure location can be specified by a combination of lighting of the input-side alarm display section 37 and the output-side alarm display section 38.

[0060]

As described above, according to the failure determination device for a switch circuit according to the present invention, for example, in the input-side voltage determination display section, the input-side voltage at the input-terminal-side fixed-side contact is equal to or higher than the input threshold voltage. On the other hand, if the output side voltage judgment display section indicates that the output side voltage at the output terminal side fixed side contact is equal to or lower than the output threshold voltage, it indicates at a glance that the switch contact has caused a contact failure. It is understood by. Also, in the input side voltage determination display section, it is displayed that the input side voltage at the input terminal side fixed side contact is equal to or lower than the input threshold voltage, and in the output side voltage determination display section, the output side of the output terminal side fixed side contact is also displayed. When it is displayed that the voltage is equal to or lower than the output threshold voltage, it becomes apparent at a glance that the control cable, the wiring cable, and the mounting terminal are loose. On the other hand, in the input side voltage determination display section,
The input side voltage at the input terminal side fixed side contact is displayed as being equal to or higher than the input threshold voltage, and the output side voltage determination display section also indicates that the output side voltage at the output terminal side fixed side contact is equal to or higher than the output threshold voltage. If so, it can be seen at a glance that the switch circuit is normal. That is, it is possible to grasp whether or not the switch circuit is faulty only by visually observing the display states of the input-side voltage judgment display section and the output-side voltage judgment display section, and to further identify the cause of the fault by the display combination of the display sections. Therefore, it is possible to shorten the repair work time.

Further, by turning on / off the input-side voltage judgment display section and the output-side voltage judgment display section, it is possible to easily grasp whether the switch circuit is faulty only by visually checking the lighting / off state. it can.

Further, the input-side voltage degree display section and the output-side voltage degree display section indicate the degree of decrease in the actual input / output voltage with respect to the specified input / output voltage by the lighting state of the plurality of light emitting diodes. Can be recognized. This makes it possible to easily determine whether or not maintenance should be performed. Further, a failure point can be specified by a combination of the display on the input side voltage level display section and the display on the output side voltage level display section.

Further, the input-side alarm display section and the output-side alarm display section indicate the degree of reduction of the input / output voltage in the region between the specified input / output voltage and the threshold input / output voltage by the lighting state of the plurality of light emitting diodes. Therefore, the degree of pass / fail of the switch circuit can be recognized. This makes it possible to easily determine whether or not maintenance should be performed based on the lighting state of the alarm display unit. Further, a failure location can be specified by a combination of the display on the input side alarm display section and the display on the output side alarm display section.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of a failure determination device for a switch circuit according to the present invention.

FIG. 2 is a diagram showing a configuration of a small substrate 27 shown in FIG.

FIG. 3 is a diagram illustrating a state in which the first embodiment of the failure determination device for a switch circuit according to the present invention is used for a door lock switch of a landing door.

FIG. 4 is a diagram showing a configuration of a second embodiment of the failure determination device for a switch circuit according to the present invention.

FIG. 5 is a diagram illustrating a configuration of a third embodiment of the failure determination device for a switch circuit according to the present invention.

FIG. 6 is a diagram showing a configuration of a small substrate 32 shown in FIG.

FIG. 7 is a diagram showing a configuration of a small substrate 39 shown in FIG.

FIG. 8 is a diagram showing an overall configuration of an elevator.

FIG. 9 is a detailed configuration diagram of a switch used in a conventional elevator.

FIG. 10 is a view showing a configuration of a hanger of a landing door having a conventional door lock switch.

11 is an enlarged view of a movable contact and a fixed contact of the door lock switch of FIG. 10;

[Explanation of symbols]

14a movable contact, 14b, 14c fixed contact, 1
5a, 15b mounting terminal, 16a, 16b wiring, 2
5, 26 light emitting diode, 27 small substrate, 28, 29
resistance.

Claims (4)

[Claims] 1. A switch that is energized when a movable contact comes into contact with both fixed contacts of an input terminal fixed contact and an output terminal fixed contact, wherein the input voltage at the input terminal fixed contact is greater than or equal to an input threshold voltage. An input-side voltage determination display unit that displays whether or not there is an output-side voltage determination display unit that displays whether an output-side voltage at the output terminal-side fixed contact is equal to or higher than an output threshold voltage. Failure determination device for a switch circuit. 2. The failure determination device for a switch circuit according to claim 1, wherein the input-side voltage determination display section lights up when an input-side voltage at an input-terminal-side fixed contact is greater than or equal to an input threshold voltage, and The output circuit is turned off when the output voltage at the output terminal side fixed contact is higher than or equal to the output threshold voltage, and is turned off when the output voltage is lower than the output threshold voltage. Judgment device. 3. A switch which is energized by contacting a movable contact with both fixed contacts of an input terminal fixed contact and an output terminal fixed contact, wherein the actual input voltage at the input terminal fixed contact and a prescribed input An input-side comparator for comparing a voltage, an input-side voltage degree display unit for displaying a decrease in the input-side voltage from an output from the input-side comparator, and an actual output-side voltage at the output terminal-side fixed contact. An output-side comparator for comparing the output voltage with a specified output voltage; and an output-side voltage degree display unit for displaying a decrease in the output-side voltage from an output from the output-side comparator. The unit and the output side voltage degree display unit displays the degree of decrease of the actual input / output voltage with respect to the specified input / output voltage, and allows the user to recognize the quality of the switch circuit. Disability determination device. 4. A switch which is energized when a movable contact comes into contact with both fixed contacts of an input terminal fixed contact and an output terminal fixed contact, wherein an actual input voltage at the input terminal fixed contact and a prescribed input An input-side inversion comparator for comparing a voltage with the output and inverting the output; an input-side alarm display unit for displaying a decrease in the input-side voltage from an output from the input-side inversion comparator according to a lighting degree; and the output terminal side. An output inversion comparator for comparing the actual output voltage at the fixed contact with a specified output voltage and inverting the output; and displaying the decrease in the output voltage from the output from the output inversion comparator by the lighting degree. An output-side alarm display unit, and the input-side alarm display unit and the output-side alarm display unit,
A failure determination device for a switch circuit, wherein a degree of decrease in the input / output voltage is displayed in an area between the prescribed input / output voltage and a threshold input / output voltage, and the quality of the switch circuit is recognized.