JPH0795356B2 - Circuit abnormality automatic detection circuit - Google Patents
Circuit abnormality automatic detection circuitInfo
- Publication number
- JPH0795356B2 JPH0795356B2 JP1316904A JP31690489A JPH0795356B2 JP H0795356 B2 JPH0795356 B2 JP H0795356B2 JP 1316904 A JP1316904 A JP 1316904A JP 31690489 A JP31690489 A JP 31690489A JP H0795356 B2 JPH0795356 B2 JP H0795356B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- current
- sensor
- detection circuit
- short
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Emergency Alarm Devices (AREA)
- Alarm Systems (AREA)
- Selective Calling Equipment (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、列車接近警報器や、土木変状警報器等、防災
警報回路に於て特別な遠隔操作や、回路変更等を加える
必要なく、回線の異状を検知する回線異状自動検知回路
に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention does not require special remote control or circuit modification in a disaster warning circuit such as a train approach warning device or a civil engineering change warning device. The present invention relates to a circuit abnormality automatic detection circuit for detecting a circuit abnormality.
［従来の技術］ 従来、前記防災警報システムにおいて、センサーによる
遠隔制御が行われている。即ち、第１図に示すように、
三線式で電圧出力形センサａを使用したものが存在して
いる。[Prior Art] Conventionally, remote control by a sensor is performed in the disaster prevention alarm system. That is, as shown in FIG.
There is a three-wire type using a voltage output type sensor a.
［発明が解決しようとする問題点］ 前記した警報手段ではセンサによる遠隔制御が行われて
いる。その機能上重要視されるのが即ち、常に安全側に
動作するフェイルセーフの思想である。[Problems to be Solved by the Invention] In the above-mentioned alarm means, remote control is performed by a sensor. What is regarded as important in terms of its function is the idea of fail-safe, which always operates on the safe side.
屋外長距離の配線を伴う場合は、断線及び短絡の回線異
状が速やかに適格に把握されることにより、装置が常に
正常な待機状態に置かれていないと不覚を取ることにも
なり、従来前記第１図に示す方法が考えられている。こ
の回路では、待機時（無信号時）センサａの出力トラン
ジスタTroがONになり、高抵抗ＲからダイオードDiを通
って電流ioが流れる。又その逆の信号時には、TroはOF
F、io＝０となり、入力トランジスタTrの入力はＨとな
る。In the case where long-distance wiring is required outdoors, disconnection and short circuit lines can be quickly and properly detected, which may lead to a sense that the device is not always in a normal standby state. The method shown in FIG. 1 is considered. In this circuit, the output transistor Tro of the sensor a is turned on during standby (when there is no signal), and the current io flows from the high resistance R through the diode Di. When the signal is the opposite, Tro is OF
F and io = 0, and the input of the input transistor Tr becomes H.
従って、断線、短絡等回線異状による入力トランジスタ
Trの動作は次のようになる。Therefore, the input transistor due to line abnormality such as disconnection or short circuit
The operation of Tr is as follows.
これを要するに次のような問題点が存在する。 In summary, there are the following problems.
（１）断線、短絡、信号（動作）の識別が出来ない。(1) The disconnection, short circuit, and signal (operation) cannot be identified.
（２）l1−l3の短絡では無警報の危険がある。(2) the risk of non-alarm Shorting l 1 -l 3.
（３）l2−l3の短絡では完全に無信号となる。(3) With a short circuit between l 2 and l 3 , there is no signal.
従って前記（１）の断線、短絡及び信号（動作）の識別
ができないので、この作動が検知され、故障が容易迅速
で適格に行なわれる事が望まれてるが、又それ以上に前
記（３）の短絡によって無信号の場合が生ずることは重
要で、放置は危険を伴うものであることを考慮しなけれ
ばならない。Therefore, since the disconnection, the short circuit and the signal (operation) in the above (1) cannot be identified, it is desired that this operation is detected, and the failure be easily, promptly and properly performed. It must be taken into consideration that it is important that a short-circuit occurs in the case of no signal, and leaving it unattended is dangerous.
［問題点を解決するための手段］ 本発明は斯様な実情に鑑み、これ等の問題に対処するた
めに創案したもので、即ち二線式電流出力形近接スイッ
チをセンサーとする警報回路において、待機中のセンサ
ーから常時発する漏れ電流と、センサーの動作時に発生
する動作電流、および短絡時に発生する短絡電流の３種
の電流、又は、それらに因って誘起する電圧をそれぞれ
の検知回路に導入して回路異状を検知することを特徴と
した回線異状自動検知回路としたもので、断線、短絡の
現象が識別検知されるため故障の判断が容易に行なわ
れ、更に３線式と比較して配線を容易にすると共に保守
の安易及びコストの安価等を目的に提出したものであ
る。[Means for Solving Problems] The present invention has been made in view of the above circumstances to address these problems, that is, in an alarm circuit using a two-wire type current output type proximity switch as a sensor. , Three kinds of currents, that is, a leakage current that constantly emanates from a sensor in standby mode, an operating current that occurs when the sensor operates, and a short-circuit current that occurs when a short circuit occurs, or a voltage induced by these three currents, to each detection circuit. A circuit abnormality automatic detection circuit characterized by being introduced to detect circuit abnormality. Since the phenomenon of disconnection and short circuit can be identified and detected, it is easy to judge a failure. It is submitted for the purpose of facilitating wiring, easy maintenance, and low cost.
［作用］ 本発明の回路では、待機時（無信号）では、回路には漏
れ電流ioが流れ、入力側A,B点から見てVoなる電圧降下
が発生する。従ってＢ点の電位は（Ｖ−Vo）となるがゼ
ナーダイオードDZによってｉ≒０に近い状態に保つこと
ができるので他回路の影響は無視でき能率良くトランジ
スタTrをONにする。また待機時の信号入力回路では、フ
ォートカプラPcの動作電流ｉは、通常数mAを要するので
フォートカプラPcは動作しない。更に短絡検知回路にお
いてIC4の入力回路には抵抗R2による電圧降下が生じる
が、抵抗R2は低抵抗に設定して（A,B間を短絡した際の
電流によって始めて動作するよう設定）あり、低電位の
ため動作しない。[Operation] In the circuit of the present invention, during standby (no signal), the leakage current io flows through the circuit, and a voltage drop of Vo occurs when viewed from the points A and B on the input side. Therefore, the potential at the point B becomes (V-Vo), but it can be kept close to i≈0 by the Zener diode DZ, so that the influence of other circuits can be ignored and the transistor Tr is turned on efficiently. In the signal input circuit during standby, the operating current i of the fort coupler Pc normally requires several mA, so the fort coupler Pc does not operate. Although further voltage drop by the resistor R 2 occurs in the input circuit IC 4 in short circuit detection circuit, the resistance R 2 is set to a low resistance (A, set to operate starting by a current at the time of short circuit between B) Yes, it does not work because of the low potential.
次に断線時には、A,B間は開放となりＢ点の電位は０に
なる。Next, at the time of disconnection, A and B are open, and the potential at point B becomes zero.
従ってこの場合、断線検知回路は、トランジスタTrのベ
ース電圧Va＝０となり、トランジスタTrはOFF、シュミ
ットトリガインバータIC1の入力はＨ（Ｖ）となり、シ
ュミットトリガインバータIC1，IC2によって出力はＨ
（Ｖ）となる。従ってリレーRY1は働き、断線検知回路
を構成し信号を出す。In this case, therefore, the disconnection detection circuit, the base voltage Va = 0 next to the transistor Tr, the transistor Tr is OFF, Schmitt trigger input inverter IC 1 'H (V), and the output Schmitt trigger inverter IC 1, IC 2 is H
(V). Therefore, the relay RY 1 works, constitutes a disconnection detection circuit, and outputs a signal.
また信号入力回路では、電流ｉ＝０で、そのためフォー
トカプラPcは作動しない。Further, in the signal input circuit, the current i = 0, so that the fort coupler Pc does not operate.
また短絡検知回路では、入力電圧Vb＝０で動作しない。The short circuit detection circuit does not operate at the input voltage Vb = 0.
信号入力回路時ではセンサー１はトランジスタTroの導
通によって、信号入力電流io1≫漏れ電流ioまたA,B間の
電圧降下Voは低下する。In the signal input circuit, the sensor 1 conducts the transistor Tro so that the signal input current io 1 >> leakage current io and the voltage drop Vo between A and B decrease.
この時に断線検知回路では、トランジスタTrの入力電圧
Vaはその分増加し、TrはON状態に変化なく、従って出力
はない。また信号入力回路では、その入力電流が増大す
ることで、フォートカプラPcは作動し、シュミットトリ
ガインバータIC3の出力はＨとなる。従ってリレーRY2が
働き、信号入力回路を構成し、信号を出す。更に短絡検
知回路では、信号入力時の入力電圧Vb2＞待機時の電圧V
b1となるが抵抗R2は低く設定され出力はない。At this time, in the disconnection detection circuit, the input voltage of the transistor Tr
Va increases accordingly, and Tr does not change to the ON state, so there is no output. Further, in the signal input circuit, the input current increases, the fort coupler Pc operates, and the output of the Schmitt trigger inverter IC 3 becomes H. Therefore, the relay RY 2 operates, constitutes a signal input circuit, and outputs a signal. Furthermore, in the short circuit detection circuit, the input voltage Vb 2 at signal input> voltage V at standby
It becomes b 1 , but the resistance R 2 is set low and there is no output.
短絡時には、Ｂ点の電位はＡ点と同じになり短絡電流io
2＞信号入力電流io1＞漏れ電流ioとなる。従って、この
時断線検知回路では、トランジスタTrはONとなって出力
はない。信号入力回路では、当然に電流ｉは増加し、フ
ォートカプラPcはONとなり、出力はＨとなる。従ってリ
レーRY2を働かせるが、一方後記するRY3の動作で入力回
路は開となり信号は出ない。また短絡検知回路では、短
絡時電圧、Vb3はシュミットトリガインバータIC4の導通
条件を満足してONとなり同IC4，IC5で出力はＨとなる。
従ってリレーRY3が働き短絡検知回路を構成し信号を出
す。しかしリレーRY3は信号入力回路を前記した開とす
る。At the time of short circuit, the potential of point B becomes the same as that of point A and the short circuit current io
2 > signal input current io 1 > leakage current io. Therefore, at this time, in the disconnection detection circuit, the transistor Tr is ON and there is no output. In the signal input circuit, the current i naturally increases, the fort coupler Pc turns ON, and the output becomes H. Therefore, relay RY 2 is activated, but the operation of RY 3 described later opens the input circuit and no signal is output. In the short circuit detection circuit, short-circuit voltage, Vb 3 is output by the Schmitt trigger inverter ON and the IC 4 satisfy the continuity conditions of the IC 4, IC 5 becomes H.
Therefore, the relay RY 3 operates to form a short circuit detection circuit and outputs a signal. However, the relay RY 3 opens the signal input circuit as described above.
［実施例］ 次に本発明に係る回線異状検知回路の一実施例を図面に
ついて説明する。[Embodiment] Next, an embodiment of the line abnormality detection circuit according to the present invention will be described with reference to the drawings.
１はトランジスタTro及び内部抵抗Roを有した電流出力
形センサで、このセンサ１は二線式回路に設けてある。
また二線式回路には、入力側に高抵抗Ｒを配したトラン
ジスタTrと、２つのシュミットトリガインバータIC1，I
C2を備えた断線検知回路と、直列抵抗R1及びゼナーダイ
オードDZを経て、フォートカプラPc、シュミットトリガ
インバータIC3を備えた信号入力回路と、フォートカプ
ラPcとアース間に抵抗R2を配して接続した２つのシュミ
ットトリガインバータIC4，IC5を備えた短絡検知回路を
有して構成される。回路抵抗R2は短絡した際の電流によ
って始めて動作するように設定した抵抗である。1 is a current output type sensor having a transistor Tro and an internal resistance Ro, and this sensor 1 is provided in a two-wire circuit.
The two-wire circuit has a transistor Tr with a high resistance R on the input side and two Schmitt trigger inverters IC 1 and I.
A disconnection detection circuit equipped with C 2 , a series resistor R 1 and a Zener diode DZ, then a signal input circuit equipped with a fort coupler Pc and a Schmitt trigger inverter IC 3 , and a resistor R 2 between the fort coupler Pc and ground. It is configured to have a short circuit detection circuit equipped with two Schmitt trigger inverters IC 4 and IC 5 connected and connected. The circuit resistance R 2 is a resistance that is set to operate for the first time by the current when a short circuit occurs.
［効果］ 本発明は上述のように、二線式電流出力形近接スイッチ
をセンサーとする警報回路において、待機中のセンサー
から常時発する漏れ電流と、センサーの動作時に発生す
る動作電流、および短絡時に発生する短絡電流の３種の
電流、又は、それらに因って誘起する電圧をそれぞれの
検知回路に導入して回路異状を検知することを特徴とし
た回線異状自動検知回路であって、回路異常監視するた
めに特別のことをするのでなくノーマルな状態で監視が
でき、また断線、短絡及びセンサーの作動が識別検知さ
れ自動監視ができる。従って故障の判断が、容易で迅速
かつ適格に行なわれ、修理に手間がなく簡単にできる。
また２線式としたことで、一般に用いられる３線式に比
べ芯線数が少ないので、それだけ配線の手間が少なく、
敷設撤去が楽で、更に保守が楽で、コストが安価となる
等多数の効果がある。[Effect] As described above, the present invention, in an alarm circuit using a two-wire type current output type proximity switch as a sensor, has a leakage current that is constantly emitted from a sensor in standby mode, an operating current that occurs when the sensor is operating, and a short circuit. A circuit abnormality automatic detection circuit characterized by introducing three kinds of short-circuit currents generated or voltages induced by them into each detection circuit to detect a circuit abnormality. Instead of doing anything special for monitoring, it can be monitored in a normal state, and disconnection, short circuit and sensor operation can be detected and automatically monitored. Therefore, the failure determination can be performed easily, quickly and qualitatively, and the repair can be done easily without any trouble.
In addition, since the number of core wires is smaller than that of the commonly used three-wire type because it is a two-wire type, the labor of wiring is reduced accordingly.
There are many advantages such as ease of installation and removal, easier maintenance, and lower cost.
図面の第１図は従来の電圧出力形センサーを使用した３
線式異状監視回路図、第２図は本発明に係る回線異状自
動検知回路の一実施例の回路図である。 １…電流出力形センサ、Tro,Tr…トランジスタ、R,R1，
R2…抵抗、i,io…電流、Dz…ゼナーダイオード、Pc…フ
ォートカプラ、IC1，IC2，IC3，IC4，IC5…シュミット
トリガインバータ、RY1，RY2，RY3…リレーFigure 1 shows a conventional voltage output type sensor.
FIG. 2 is a circuit diagram of an embodiment of a line abnormality automatic detection circuit according to the present invention. 1 ... Current output type sensor, Tro, Tr ... Transistor, R, R 1 ,
R 2 ... Resistance, i, io ... Current, Dz ... Zener diode, Pc ... Fort coupler, IC 1 , IC 2 , IC 3 , IC 4 , IC 5 ... Schmitt trigger inverter, RY 1 , RY 2 , RY 3 ... relay
Claims (1)
とする警報回路において、待機中のセンサーから常時発
する漏れ電流と、センサーの動作時に発生する動作電
流、および短絡時に発生する短絡電流の３種の電流、又
は、それらに因って誘起する電圧をそれぞれの検知回路
に導入して回路異状を検知することを特徴とした回線異
状自動検知回路。1. In an alarm circuit using a two-wire type current output type proximity switch as a sensor, there are three types of leakage current that is constantly generated from a sensor in standby, operating current that occurs when the sensor is operating, and short-circuit current that occurs when a short circuit occurs. An automatic line abnormality detection circuit characterized by detecting a circuit abnormality by introducing a kind of current or a voltage induced by them into each detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316904A JPH0795356B2 (en) | 1989-12-06 | 1989-12-06 | Circuit abnormality automatic detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316904A JPH0795356B2 (en) | 1989-12-06 | 1989-12-06 | Circuit abnormality automatic detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03176796A JPH03176796A (en) | 1991-07-31 |
| JPH0795356B2 true JPH0795356B2 (en) | 1995-10-11 |
Family
ID=18082208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1316904A Expired - Fee Related JPH0795356B2 (en) | 1989-12-06 | 1989-12-06 | Circuit abnormality automatic detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0795356B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4879312B2 (en) * | 2009-11-25 | 2012-02-22 | 株式会社 エニイワイヤ | Remote wiring check system and connector used for the system |
| CN103446697B (en) * | 2013-07-23 | 2015-09-30 | 闽南师范大学 | A kind of linkage fault detection device for point type fire detector |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58124894U (en) * | 1982-02-18 | 1983-08-25 | 株式会社小松製作所 | Abnormality detection device |
| JPS62131400A (en) * | 1985-12-04 | 1987-06-13 | 住友電気工業株式会社 | Contact signal transmission system |
-
1989
- 1989-12-06 JP JP1316904A patent/JPH0795356B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03176796A (en) | 1991-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4618907A (en) | Desensitized ground fault interrupter | |
| US2456499A (en) | Electrical control and/or measuring system | |
| JP2542618Y2 (en) | In-vehicle load condition detection drive | |
| JPS609338A (en) | Device and method for monitoring electric load | |
| JPS63202217A (en) | Circuit supplying power to a plurality of loads | |
| JPH0373212B2 (en) | ||
| JP3098432B2 (en) | Power supply circuit | |
| US5734269A (en) | Bridge circuit fault monitoring apparatus using an output signal level from a bridge circuit and a power source current level to determine faults | |
| US4006387A (en) | Low power solid state three-phase overcurrent/undercurrent protection circuit | |
| JPH0795356B2 (en) | Circuit abnormality automatic detection circuit | |
| US4668946A (en) | System for detecting the failure of a filament lamp | |
| US3737887A (en) | Protective device operative upon transistor failure | |
| US3683362A (en) | Protective relay using an indicator and alarm circuit | |
| US3631321A (en) | Static ground fault circuit | |
| US5977662A (en) | Electronic switching device and circuits with a plurality of such switching devices | |
| JP2007072908A (en) | Plc muting device | |
| JPH084631Y2 (en) | Circuit breaker control current sensor inspection circuit | |
| JP3279811B2 (en) | Drive for control equipment | |
| SU669373A1 (en) | Fire alarm | |
| KR200179251Y1 (en) | The sensing device for grounding current | |
| JP2749344B2 (en) | Railroad crossing obstacle notification device | |
| US3747093A (en) | Alarm circuit | |
| JPS6347990Y2 (en) | ||
| KR200171615Y1 (en) | Composited fire detector | |
| JPH0645902A (en) | Electronic switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |