JPH0345499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fault indicator, and more particularly to a fault indicator that generates a short-time signal when a fault occurs.

[Background of the invention]

The conventional method will be explained with reference to FIGS. 1 to 5.

Figure 1 shows the front side of the fault indicator, and there is a lever hole 1B for returning the display window 1A to the center of the case 1.
There is 0E. FIG. 2 shows the internal mechanism of the failure indicator. The mechanism part disposed on the base 2 is housed in the case 1 and displays on the display window 1A on the front side of the case 1.

When a failure occurs, a failure response relay (not shown)
When the contact is closed and the power supply voltage is applied to the coil terminal 3, the operating coil 6 is excited through the coil lead 4 connected to the coil terminal 3. The operating coil 6 is wound around the bobbin 5, and an inverted L-shaped yoke 7 is arranged below the bobbin 5, and an armature is attached to the inverted L-shaped front part 5A below the bobbin 5. An armature 9 is attached so as to be rotatable about a shaft 11, and an iron core 8 is arranged at the center of the bobbin 5, the rear part of which is connected to a yoke 7.

On the other hand, at the rear part 5B of the bobbin 5, there is a display plate shaft 12.
A display board 10 is attached so that it can be rotated. The base 2 also includes an upper fixed contact piece 14.
A, upper movable contact piece 15A, lower fixed contact piece 14
B. The lower movable contact piece 15B is arranged, and when there is no external force, the fixed contact piece and the movable contact piece come into contact with each other due to the elasticity of the movable contact piece.

When the operating coil 6 is excited by the operation of the device, a magnetic path is formed by the iron core 8 made of a magnetic material, the yoke 7, and the armature 9, and the armature 9 is attracted to the iron core 8, but the operation When coil 6 is not energized, return spring 1
3, the armature 9 is separated from the iron core 8, and the protrusion 9A of the armature 9 hits the yoke 7 and stops.

In the display board 10, the display board holding piece 10D is connected to the armature 9.
Under normal conditions, the upper movable contact piece 15A is prevented from falling, and is engaged with the upper movable contact insulation 16A at the tip of the upper movable contact piece 15A, and the upper fixed contact piece 14A and the upper movable contact piece 15A are separated. There is.

The display board 10 has a normal display section 10A and a failure display section 10B, which can be identified by painting or the like.

When a failure occurs, the armature 9 is attracted to the iron core 8, the engagement between the armature 9 and the display board holding piece 10D is released, and the display board 10 falls due to gravity. When the display board 10 falls and the engagement between the display board 10 and the upper movable contact piece insulation 16A is released, the upper fixed contact piece 14A and the upper movable contact piece 15A come into contact.

Upper fixed contact piece 14A and lower fixed contact piece 14
B is connected by a connecting line 17. Upper fixed contact piece 1
4A, upper movable contact piece 15A, lower fixed contact piece 1
4B, lower movable contact piece 15B and connection wire 17
are made of a conductor, so while the display board 10 is falling, the upper movable contact piece 15A, the upper fixed contact piece 14A, the connection wire 17, the lower fixed contact piece 14B,
The lower movable contact piece 15B is electrically closed and can provide a signal to an external circuit, this state being shown in FIG.

When the display board 10 further falls due to gravity from the state shown in FIG.
The arm portion 10C of the bobbin 5 is the inverted L-shaped front portion 5A of the bobbin 5.
It comes to rest when it hits the protrusion 5C. At this time, the lower fixed contact 14B and the lower movable contact 15B are no longer in contact with each other, so the signal to the external circuit is cut off, and the failure display section 10B of the display board 10 is displayed on the display window 1A. This state is shown in FIG.

Due to failure recovery, failure response relay (not shown)
When it returns, the operating coil 6 becomes non-excited, and the armature 9 is separated from the iron core 8 by the return spring 13. This state is shown in FIG. When the display board return lever 10E of the display board 10 is pushed upward from this state, the armature 9 compresses the return spring 13 by the amount that it engages with the display board holding piece 10D, but the display board holding piece 10D If you go above 9, the armature 9
The return spring 13 returns the armature protrusion 9A to the position where it touches the yoke 7, and the display board return lever 1
Even if the external force pushing up 0E is removed, the display board 10 is held in the position where the normal display section 10A is displayed on the display window 1A because the armature 9 and the display board holding piece 10D are engaged, and the display board 10 is held at the position where the normal display part 10A is displayed on the display window 1A, The state shown in Figure 2 is reached.

In the failure indicator configured in this way, while the failure recovery board and the display board 10 are being restored, the state is the same as when the display board 10 is falling due to the occurrence of a failure, and therefore has the disadvantage of generating unnecessary signals.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a failure indicator that generates a signal when a failure occurs and does not generate unnecessary signals during a recovery operation.

[Summary of the invention]

In the present invention, the fault indicator is configured to forcibly open the contacts in conjunction with the armature when the coil is energized, and on the other hand, the fault response relay contacts outside the fault indicator and the contacts outside the fault indicator By connecting these in series, pulse output at the time of recovery is prevented.

[Embodiments of the invention]

An embodiment according to the present invention will be explained with reference to FIGS. 6 to 11.

FIG. 6 shows the front side of the fault indicator. There is a display window 1A and a return lever hole 1B in the center of the case 1, and a display plate return lever 1 is located in the return lever hole 1B.
There is 0E. FIG. 7 shows the internal mechanism of the failure indicator, and the mechanism part disposed on the base 2 is housed in the case 1, and is designed to display information in the display window 1A on the front surface of the case 1. Further, the inside and outside of the failure indicator are wired as shown in FIG.

In FIGS. 7 to 9 and 11, only the arrangement of parts is shown, and illustration of wiring is omitted.

One end of the fault response relay contact 23 is connected to P of the DC power supply.
(positive electrode), and the other end is connected to terminal 3 of the failure indicator. Diode 1 from terminal 3
9 and 20. diode 1
9, the resistor 21 and the operating coil 6 are connected in series,
One end of the operating coil 6 is connected to a terminal 3', and the terminal 3' is connected to N (negative electrode) of a DC power source. Further, the capacitor 22 is connected in parallel with the operating coil 6.

On the other hand, the diode 20 is connected to the lower movable contact piece 15
The lower fixed contact piece 14B is connected to the alarm bus A.

When the fault response relay contact 23 closes due to the occurrence of a fault, charging of the capacitor 22 starts, and upon completion of charging the capacitor 22, the operating coil 6
A DC power supply voltage is applied across the operating coil 6.
Excite. The operating coil 6 is wound around the bobbin 5, and an inverted L-shaped yoke 7 is arranged below the bobbin 5, and an armature is attached to the inverted L-shaped front part 5A below the bobbin 5. An armature 9 is mounted so that it can rotate about a shaft 11. Further, an iron core 8 is arranged at the center of the bobbin 5, and a rear portion thereof is connected to a yoke 7.

On the other hand, at the rear part 5B of the bobbin 5, there is a display plate shaft 12.
A display board 10 is attached so that it can be rotated. The base 2 also includes a lower fixed contact piece 14.
B, lower movable contact piece 15B, and substrate 18 are arranged.

Lower fixed contact piece 14B and lower movable contact piece 15
B are adapted to come into contact with each other due to the elasticity of the lower movable contact piece 15B when there is no external force.

Further, the substrate 18 includes diodes 19, 20,
A resistor 21 and a capacitor 22 are installed, and the 10th
Connected as shown.

When the operating coil 6 is excited by the operation of the device, a magnetic path is formed by the iron core 8 made of a magnetic material, the yoke 7, and the armature 9, and the armature 9 is attracted to the iron core 8, but the operation When coil 6 is not energized, return spring 1
3, the armature 9 is separated from the iron core 8, and the protrusion 9A of the armature 9 hits the yoke 7 and stops.

In the display board 10, the display board holding piece 10D is connected to the armature 9.
Under normal conditions, it is prevented from falling.

The display board 10 has a normal display section 10A and a failure display section 10B, which can be identified by painting or the like.

When a failure occurs, the armature 9 is attracted to the iron core 8, the engagement between the armature 9 and the display board holding piece 10D is released, and the display board 10 falls due to gravity. Due to the fall of the display board 10, the display window 1A has a normal display section 1.
The failure display section 10B is displayed from 0A.

When the armature 9 is attracted to the iron core 8, the lower movable contact piece 15B pushes down the lower movable contact piece insulation 16B, so that the lower movable contact piece 15B separates from contact with the lower fixed contact piece 14B and opens. Further, the armature 9 is connected to the capacitor 2 when the failure response relay contact 23 is closed.
Since the operating coil 6 is energized and attracted after the second charging is completed, there is a time delay between the closing of the failure response relay contact 23 and the opening of the lower movable contact piece 15B.

Therefore, even if the fault response relay contact 23 is closed continuously, a short-time signal is generated on the alarm bus A connected to the lower fixed contact piece 14B. FIG. 8 shows the state of completion of signal generation in a short period of time.

When the fault response relay contact 23 returns due to fault recovery, the operating coil 6 becomes de-energized and the iron core 8
The armature 9 is pulled away by the return spring 13.
This state is shown in FIG. From this state, display board 1
When the display board return lever 10E of No. 0 is pushed upward, the armature 9 compresses the return spring 13 by the amount that the armature 9 engages with the display board holding piece 10D, but the display board holding piece 10D is pushed upwards from the armature 9. When the armature 9 goes up, the return spring 13 returns the armature 9 to the position where the armature protrusion 9A touches the yoke 7, and the display board return lever 10
Even if the external force pushing up E is removed, display board 1
Since the armature 9 and the display plate holding piece 10D engage with each other, the display window 1A is held in a position where the normal display portion 10A is displayed, resulting in the state shown in FIG. 7 before the failure occurs.

The diode 19 prevents an erroneous signal from flowing to the alarm bus A by discharging the capacitor 22 when the fault response relay contact 23 is opened. A signal from the indicator is input to prevent erroneous energization of the operating coil 6.

Further, the resistor 21 limits the current flowing through the capacitor 22 at the moment the fault response relay contact 23 is closed.

In the fault indicator configured in this manner, a short-time signal is generated using the fault-responsive relay contacts 23, so that unnecessary signals are not generated during the return of the display board 10.

A modification of the present invention will be explained with reference to FIG.

In FIG. 12, a relay 24 operated by a fault response relay contact 23 is provided, and a contact 25 of the relay 24 is provided.
, lower fixed contact piece 15B, lower movable contact piece 14
B generates a short-time signal.

In FIG. 12, the fault response relay contact 23 of the short-time signal generation circuit of FIG. (positive electrode). In this case, there is no looping of signals from other fault indicators connected to alarm bus A, and there is no looping of signals from the N bus to the A bus during the transient period that makes use of the power supplies P and N, so the diode 1 in Figure 10
9 and 20 are unnecessary.

In addition, although the diodes 19, 20, resistor 21, capacitor 22, and relay 24 are built into the fault indicator and configured as an integrated unit, the same effect can be achieved even if some of these parts are installed outside the fault indicator. There is.

In addition, in the figure, 18 is a board, and 26 is a contact terminal.

〔Effect of the invention〕

According to the present invention, the display board falls when a failure occurs, generates a short-time signal, and has the effect of not generating unnecessary signals during the return operation of the display board after recovery from the failure.

[Brief explanation of drawings]

Figures 1 to 5 show conventional embodiments, Figure 1 is a front view of the fault indicator, Figure 2 is a side view showing the internal mechanism of Figure 1, and Figure 3 is the failure of Figure 2. Figure 4 shows a state in which the display board is falling due to the failure, Figure 4 shows a state in which the display board in Figure 3 has completed its falling operation, and Figure 5 shows a state in which the failure has been recovered from the state in Figure 4. The figures shown in FIGS. 6 to 11 show an embodiment according to the present invention, and FIG. 6 is a front view of a fault indicator;
FIG. 7 is a side view showing the internal mechanism of FIG. 6, and FIG. 8 shows a state in which the display board has fallen due to the occurrence of the failure in FIG. Figure 9 is a diagram showing a state in which the failure has been recovered from the state in Figure 8, Figure 10 is a diagram of the internal and external connections of the failure indicator, Figure 11 is a diagram showing the device mounting surface of the board, and Figure 12. FIG. 3 is an internal and external connection diagram of a failure indicator showing a modification of the present invention. 19...Diode, 20...Diode, 2
1...Resistor, 22...Capacitor, 23...Failure response relay contact, 24...Relay, 25...Relay contact, 26...Contact terminal.

Claims (1)

[Claims] 1. A base, and a coil configured by winding wire around a bobbin fixed to the base and having an iron core;
A rotatable armature that is attracted to the front part of the bobbin by the excitation of the coil and is normally separated by a spring between the front part of the bobbin and the armature, and A display board that is rotatably supported at one end and has a display section at the other end, which is locked by the armature when the coil is not energized and is not locked by the armature when the coil is energized. a display plate that detaches and rotates; a first contact consisting of a fixed contact and a movable contact; and a first contact that operates in conjunction with the armature and that operates on the movable contact of the contact when the armature is attracted to the front part of the bobbin. a lever that opens the contact when the suction is applied, and closes the contact when the suction is not applied; a case that stores the above-mentioned components between the base; and a drop position for the display board from outside the case. The fault indicator is constructed of a return means for returning the armature to the locking position from the armature, and the fault indicator is configured such that one end of the coil winding inside the fault indicator is connected to a fault responsive relay contact provided outside. 1 power supply bus, the other end of the coil winding is connected to an external second power supply bus, one of the contacts inside the fault indicator is connected to the first power supply bus, and the other of the contacts is connected to the first power supply bus. A fault indicator used by connecting to an external third power supply bus.