JPH08111155A - Disconnection inspecting device of relay coil - Google Patents

Abstract

PURPOSE: To announce that disconnection is caused even after connection of a coil is restored by judging the disconnection of a relay coil by an operating voltage detecting result and a coil current breaking result, and continuously lighting a judged result on an indicating lamp. CONSTITUTION: Contact points 11 and 12 are opened through operation of a sequence circuit, and when a coil of a U relay 13 is normally connected, an exciting current flows to an X relay 5, and it is energized, and the exciting current also flows to a Y realy 7, and it is energized. Then, since an (a) contact point Ya of the relay 7 is closed and an (a) contact point Xb of a relay 9 is opened, the Z relay 9 is not energized, and an indicating lamp 10 is not lighted. Here, when disconnection is caused in the coil of the relay 13, the relay 5 is deenergized, but the exciting current continuously flows to the relay 7 through the contact points 11 and 12, and the indicating lamp 10 is lighted. Next, when the contact points 11 and 12 are opened, the relay 7 is opened, but since the relay 9 self holds by closing of an (a) contact point Za, the indicating lamp 10 is lighted as it is. Therefore, the fact that the disconnection is restored is announced by lighting of the indicating lamp 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay coil which detects a half-disconnection state in which the coil is disconnected by energization and the coil connection is restored by interruption of energization, and the half-disconnection state is indicated by a lamp even after the coil connection is restored. The present invention relates to a disconnection inspection device.

[0002]

2. Description of the Related Art FIG. 6 is a diagram for explaining a method for inspecting a half-breakage state of a relay coil A incorporated in a sequence circuit of an elevator controller or the like. In the figure, + and − are + power source line and −power source line in the sequence circuit. Between these power source lines, contacts 11 and 12 of a relay (not shown) constituting the sequence circuit and another relay coil A are connected in series. There is.

Here, for example, when it is considered that the relay coil A is in a semi-disconnected state, the disconnection is likely to occur when a current is applied to the coil, and the connection is normally restored when the current is interrupted. However, in such a detection of a half-break, when the operation of the sequence circuit cannot be stopped by removing the relay coil A, the inspection of the half-break is performed with the sequence circuit operated.

Therefore, conventionally, test rods of the tester T are applied to both ends of the relay coil A, and the coil terminal voltage when the contacts 11 and 12 are closed and a current flows in the relay coil A is measured. At this time, if the relay coil A is normal, the voltage between the terminals of the coil is a value obtained by subtracting the voltage drop due to the coil resistance from the circuit power supply voltage.

Further, when the coil is disconnected due to the current flowing through the relay coil A, the relay coil portion is opened and the value of the coil terminal voltage becomes almost the circuit power supply voltage. Therefore, by measuring the change in the voltage between the terminals of the coil with the tester T in accordance with the closed state of the contacts 11 and 12, it is possible to detect the half-breakage state even at the site.

[0006]

As described above, according to the conventional disconnection inspection method, the change in the voltage between the terminals of the coil is measured by the tester in accordance with the closing operation of the contact. Therefore, the coil is disconnected and the coil terminal is disconnected. It is necessary to perform inefficient inspection work such that voltage measurement is continued for a long time until the voltage rises, and if the contact opening and closing operation time is short, even if the coil is disconnected due to energization However, there is a problem in that the disconnection of the coil may be overlooked if it is connected to.

The present invention has been made to solve the above problems, and a relay coil disconnection inspection device capable of notifying that there is a coil disconnection even when the coil connection is restored after the coil disconnection. Aim to get.

[0008]

A relay coil disconnection inspection apparatus according to the invention of claim 1 is a coil inserted between one end of a relay coil to be inspected for disconnection and connected to a minus power supply line in a relay circuit. Current cutoff detection means, operation voltage detection means for detecting a relay operation voltage applied to the other end of the relay coil, operation voltage detection result by the operation voltage detection means, and coil current cutoff detection by the coil current cutoff detection means A disconnection judging means for judging the disconnection of the relay coil from the result and for continuously indicating the judgment result on the indicator lamp to notify the disconnection is provided.

According to a second aspect of the present invention, there is provided a relay coil disconnection inspection device, wherein the disconnection determining means is the same as the first invention.
After the indicator lamp is turned on, the indicator lamp is continuously turned on even after the relay operation voltage interruption detection or the coil current energization detection.

[0010]

In the relay coil disconnection inspection apparatus according to the present invention, when the interruption of the coil current is detected despite the operating voltage being applied to the relay coil, the relay coil disconnection is judged. By continuously displaying the determination result with the indicator light, it is possible to leave the event that the relay coil has a wire breakage.

In the relay coil disconnection inspection device according to the second aspect of the present invention, when the relay operating voltage is interrupted and the connection of the relay coil is restored, or when the connection of the relay coil is restored and the energization of the coil current is detected. Even if the indicator lamp is turned on, the indicator lamp is not turned off and is continuously turned on, so that the half-breakage state can be displayed even if the relay coil normally operates.

[0012]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a ladder circuit diagram showing a circuit configuration of a relay coil disconnection inspection apparatus according to this embodiment. In the figure,
1 and 2 are + power supply voltage, − from the sequence circuit shown in FIG.
These are a + power supply terminal and a − power supply terminal for taking in the power supply voltage.
Reference numerals 3 and 4 denote a first connection terminal and a second connection terminal for connecting the + terminal and the-terminal of the relay coil to be inspected in the sequence circuit.

Reference numeral 5 is a coil of an X relay as coil current interruption detection means connected between the second connection terminal 4 and the power supply terminal 2, 6 is a variable resistor connected in parallel with the coil 5, and 7 is the first connection. It is a coil of a Y relay as an operating voltage detecting means connected between the terminal 3 and the power source terminal 2.

Reference numeral 8 is a fuse holder connected to the positive power supply terminal 1, Ya and Xb are a contacts of the Y relay 6 and b contacts of the X relay 5, respectively, and a contacts Ya, b contacts Xb and Z relay 9 are It is connected in series between the + power source terminal 1 and the − power source terminal 2 through the fuse holder 8, and the first a contact Za of the Z relay 9 is connected to the series body of the a contact Ya and the b contact Xb to serve as a disconnection determination means. Self-holding circuit is configured. In addition, this self-holding circuit has a second Z relay 9
An indicator lamp lighting circuit composed of the a-contact Za and the indicator lamp 10 is connected in parallel.

FIG. 2 is a perspective view of a relay coil disconnection inspection apparatus having the ladder circuit shown in FIG. In the figure,
The same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the figure, 5S, 7S, and 9S are relay sockets for mounting X relay 5, Y relay 7, and Z relay 9 on the device, and 6S, respectively.
a is a variable resistance rotating shaft, 6b is a scale plate, and 10S
Is a lamp socket for mounting the indicator lamp 10.

Next, the operation of this embodiment will be described.
For example, when performing the half-breakage inspection of the U relay 13 in the sequence circuit shown in FIG. 3, first, the connection between the-coil terminal and the-power supply line of the U relay 13 is disconnected. The + power supply line of the sequence circuit is connected to the + power supply terminal 1 of the device, and the − power supply line is connected to the − power supply terminal 2 and the U relay 1 from the part of FIG.
The + coil terminal B of 0 is connected to the first connection terminal 3 and the − coil terminal C is connected to the second connection terminal by the leads 14 shown in FIG. 1, respectively. After that, adjust the value of variable resistor 6 and make U relay 1
3 is adjusted with the value of 90% of the power supply voltage of the circuit, and the divided voltage by the variable resistor 6 is adjusted so that the X relay 5 is operated with the value of 10% of the power supply voltage.

As described above, after the connection to each terminal and the adjustment of the variable resistor 6 are completed, the contacts 11 and 12 of the sequence circuit or one of the contacts 11 is opened when the device is operated, and each contact 11 is opened. Since no exciting current flows through the Y relay 7 through Nos.

Further, since the exciting current does not flow through the X relay 5 through the contacts 11, 12 and the U relay 13, the X relay 5 is not energized. Therefore, since the a-contact Ya of the self-holding circuit is kept open and the b-contact Xb is kept closed, the Z relay 9 is not energized and the indicator lamp 10 connecting the second a-contact Za of the Z relay 9 in series is turned on. do not do.

Next, when the contacts 11 and 12 are closed through the operation of the sequence circuit and the operating voltage is applied to the U relay 13, if the coil of the U relay 13 is normally connected, the U relay 13 is used. An exciting current flows and energizes the X relays 5 connected in series. At this time, each contact 1
An exciting current also flows through the Y relay 7 through 1 and 12 to energize it.

As described above, the a contact Ya of the Y relay 7 is closed by the urging of the relays 5 and 7, but the b contact of the X relay 5 is closed.
Since the contact Xb is opened, the Z relay 9 is not energized, and thus the indicator lamp 10 is not turned on by opening the second-a contact Za of the Z relay 9. Therefore, when it is confirmed that the indicator lamp 10 does not light up even if the operating voltage is applied to the U relay 13, it is determined that the coil of the U relay 13 is normal.

However, when the contacts 11 and 12 are closed through the operation of the sequence circuit and the operating voltage is applied to the U relay 13, if the coil of the U relay 13 is broken,
The exciting current of the X relay 5 connected in series through the U relay 13 is cut off and deenergized. However, at this time, the exciting current continues to flow through the Y relay 7 through the contacts 11 and 12 and is energized.

In this way, by activating the Y relay 7 and deactivating the X relay 5, the a contact Ya of the Y relay 7 is closed and the b contact Xb of the X relay 5 is closed. Z
Relay 9 is energized. As a result, the 1a contact Za of the Z relay 9 is closed to maintain the self-holding state of the Z relay 9, and the indicator lamp 10 is turned on by closing and releasing the 2a contact Za. As a result, the lighting of the indicator lamp 10 is confirmed and the U relay 1
The coil breakage of 3 is determined.

Next, when the contact 11 or 12 is opened by the operation of the sequence circuit, the Y relay 7 is de-energized and the a contact Ya is opened, but the Z relay 9 is the first a contact Za. Second because it maintains self-holding due to closure
The indicator lamp 10 is turned on by closing the a-contact Za. Therefore, once the coil breakage of the U relay 13 is determined and the indicator lamp 10 is turned on, the coil breakage state is continuously displayed even if the operating voltage of the U relay 13 is cut off.

Even if the contacts 11 and 12 are closed again and the operating voltage is applied, and the coil current flows through the U relay 13, the indicator lamp 10 is not turned off. A member can be informed that the coil of the U relay 13 has been disconnected.

Example 2. In the first embodiment described above, the half open state of the relay in which the operating voltage is about 90% of the power supply voltage of the sequence circuit is detected, but as shown in FIG.
In order to detect the half-break condition of the W relay 16 which is connected in series with 5 and has an operating voltage of about 45% of the power supply voltage, the resistance value of the variable resistor 6 is varied so that the voltage of about 10% of the power supply voltage is the X relay. 4 may be applied.

Example 3. In Embodiments 1 and 2 described above, the half-breakage of the relay incorporated in the sequence circuit is determined. However, as shown in FIG. 5, the sequence circuit maintains a closed state during normal operation, for example, in an emergency circuit. The abnormal open state of the a-contact 17 of the relay may be determined.

In that case, after the connection between the a-contact 17 for judgment and the relay coil 18 is released, the + power supply line connection side of the a-contact 17 is connected to the first connection terminal 3 of the device and the a-contact 17
Of the power supply line connection side of the device is connected to the second connection terminal 4 of the device by a lead wire respectively, the + power supply line a of the sequence circuit is connected to the + power supply terminal 1 of the device, and the -power supply line is connected from the part d to the power supply terminal 2. Connect to.

As a result, the a contact 16 is attached to one end of the a contact 17.
When the contact a 17 is abnormally opened and the exciting current to the X relay 5 is cut off even though the power supply voltage is applied through the Y relay 7, the Y relay 7 is energized and the X relay 5 is activated as in the first embodiment.
Is deenergized, the a contact Ya of the Y relay 7 is closed, and the b contact Xb of the X relay 5 is closed, so that the Z relay 9 is energized.

As a result, the first-a contact Za of the Z relay 9 is closed to maintain the self-holding state of the Z relay 9, and the second contact
The indicator lamp 10 lights up when the a contact Za is closed. The maintenance worker confirms the lighting of the indicator light 10 and determines whether the a-contact 17 is abnormally opened. After the abnormal opening, even if the a-contact 17 returns to the closed state, the self-holding circuit keeps the indicator lamp 10 lit to notify that there is an abnormal opening.

Example 4. In each of the above-described embodiments, the indicator lamp 9 is turned off without specifically identifying the cutoff of the operating voltage and the normality of the determination target. However, as indicated by the broken line in FIG.
You may connect in parallel the series circuit of each b contact Xb and Yb of the relay 5 and the Y relay 7, and the indicator lamp 19 for an operating voltage cutoff display. As a result, for example, when the a-contacts 11 and 12 are closed and the operating voltage is not applied to the Y relay 7 and the U relay 13, the b-contacts of the X relay 5 and the Y relay 7 are Xb and Yb are closed. The indicator lamp 19 is lit while keeping it.

[0031]

According to the first aspect of the present invention, coil current interruption detecting means inserted between one end of the relay coil to be inspected for disconnection and connected to the minus power supply line, which is connected to the relay circuit, and the relay coil. A disconnection of the relay coil is determined based on an operating voltage detecting means for detecting a relay operating voltage applied to the other end, an operating voltage detecting result by the operating voltage detecting means and a coil current interruption detecting result by the coil current interruption detecting means. Therefore, if the disconnection of the coil current is detected in spite of the operating voltage being applied to the relay coil, it is provided with the disconnection determining means for continuously lighting the determination result on the indicator lamp to notify the disconnection. , It is possible to leave the event that the relay coil has a wire break by judging the wire break of the relay coil and displaying the judgment result continuously with the indicator light. Reliably by confirming the lighting of the appropriate indicator without continued constantly disconnection monitoring until raw easily there is an effect that can detect a half-broken.

According to the invention of claim 2, the indicator lamp is continuously lit after the indicator lamp is lit and after the relay operation voltage cutoff is detected or the coil current energization is detected. In addition, even when the relay operating voltage is cut off and the relay coil connection is restored, or when the relay coil connection is restored and the coil current is detected, the indicator lamp will continue to light without turning off. By doing so, even if the relay coil operates normally, it is possible to display the semi-disconnection state, so even if the semi-disconnection state in which the disconnection and connection are repeated irregularly, it is possible to ensure the disconnection without requiring continuous disconnection monitoring. It is effective to be able to detect

[Brief description of drawings]

FIG. 1 is a circuit diagram showing the configuration of a disconnection inspection device for a relay coil according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a relay coil disconnection inspection device according to an embodiment.

FIG. 3 is a diagram showing an arrangement of terminals for connecting a relay coil, which is a target of half-disconnection detection of a sequence circuit, and a circuit power supply to a disconnection inspection device for a relay coil.

FIG. 4 is a diagram showing an arrangement of terminals for connecting a relay coil, which is a target of half-disconnection detection of a sequence circuit, and a circuit power supply to a disconnection inspection device for the relay coil.

FIG. 5 is a diagram showing a layout of terminals for connecting a relay contact and a circuit power source, which are targets of defective contact operation detection of a sequence circuit, to a disconnection inspection device for a relay coil.

FIG. 6 is a diagram illustrating a conventional method for detecting a half-breakage in a relay coil.

[Explanation of symbols]

5 X relay, 7 Y relay, 9 Z relay, 10 indicator light, Ya, Za a contact, Xb b contact.

Claims (2)

[Claims] 1. A coil current interruption detecting means inserted between one end of a relay coil to be inspected for disconnection inspection and a negative power supply line connected to a relay circuit, and a relay operating voltage applied to the other end of the relay coil. The operating voltage detection means for detecting the operating voltage detection means, the operating voltage detection result by the operating voltage detection means and the coil current interruption detection result by the coil current interruption detection means determine the disconnection of the relay coil and continue the determination result on the indicator lamp. A disconnection inspection device for a relay coil, comprising: 2. The relay according to claim 1, wherein the disconnection determination means continuously lights the indicator light after the indicator light is turned on and after the relay operating voltage interruption is detected or the coil current energization is detected. Coil disconnection inspection device.