JPH02272919A - Abnormality detecting method for transmission circuit - Google Patents

Abnormality detecting method for transmission circuit

Info

Publication number
JPH02272919A
JPH02272919A JP1094685A JP9468589A JPH02272919A JP H02272919 A JPH02272919 A JP H02272919A JP 1094685 A JP1094685 A JP 1094685A JP 9468589 A JP9468589 A JP 9468589A JP H02272919 A JPH02272919 A JP H02272919A
Authority
JP
Japan
Prior art keywords
abnormality
transmission circuit
set value
level
transmitted signal
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.)
Pending
Application number
JP1094685A
Other languages
Japanese (ja)
Inventor
Zenjiro Watase
渡瀬 善次郎
Isao Nagai
勲 永井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
JFE Advantech Co Ltd
Kawatetsu Keiryoki KK
Original Assignee
Kawatetsu Advantech Co Ltd
Kawasaki Steel Corp
Kawatetsu Keiryoki KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawatetsu Advantech Co Ltd, Kawasaki Steel Corp, Kawatetsu Keiryoki KK filed Critical Kawatetsu Advantech Co Ltd
Priority to JP1094685A priority Critical patent/JPH02272919A/en
Publication of JPH02272919A publication Critical patent/JPH02272919A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To easily and exactly detect abnormality such as interruption, etc., by detecting the abnormality of a transmission circuit not only when the level of a transmitted signal is less than a set value but also when a ratio to be occupied by a commercial frequency component is more than the set value in the living waveform of the transmitted signal. CONSTITUTION:The detection of the abnormality is executed by a computer 22. Namely, in this computer 22, the interruption of a shield line, etc., or the abnormality of an oscillation pickup 12 and preamplifier 16, etc., is judged when the level of the signal transmitted form each oscillation pickup 12 is less than the set value or when the ratio to be occupied by the commercial frequency (50 or 60Hz) component is more than the set value in the living waveform of the transmitted signal. Thus, the abnormality such as the interruption etc., can be easily and exactly detected.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野) 本発明は、伝送回路の異常検知方法に係り、特に、オンライン設備診断装置等における断線やピックアップ、プリアンプ等の異常を正確に検知することが可能な伝送回路の異常検知方法に関づるものである。 【従来の技術】[Industrial application field] The present invention relates to a method for detecting an abnormality in a transmission circuit, and more particularly, to a method for detecting an abnormality in a transmission circuit that can accurately detect abnormalities in disconnections, pickups, preamplifiers, etc. in an online equipment diagnostic device, etc. . [Conventional technology]

オンライン設備診断装置や監視装置等においては、設備
に取付けられた振動等を測定するためのピックアップと
プリアンプ間の配線に断線があったり、ピックアップや
プリアンプ自体に異常があると、設備の故障診断が不可
能となる。このような伝送回路の異常によって正常な故
障診断が行われなくなっていることがわからずに、その
まま故障診断装置が正常に動作していると判断して適確
な対策を行わなければ、本来の故障を見逃してしまい、
設備停止等のトラブルに至ることがある。 そこで従来から、伝送回路の異常を検知する方法が考え
られており、例えば、伝送されてきた信号のレベルがあ
る一定値以下であるときに伝送回路の異常を検知する方
法が考えられている。
In online equipment diagnosis equipment, monitoring equipment, etc., if there is a break in the wiring between the pickup installed on the equipment to measure vibrations, etc. and the preamplifier, or if there is an abnormality in the pickup or preamplifier itself, the failure diagnosis of the equipment cannot be performed. It becomes impossible. If you do not know that normal failure diagnosis is not being performed due to an abnormality in the transmission circuit, and do not assume that the failure diagnosis device is operating normally and take appropriate measures, the original failure will occur. I missed the failure,
This may lead to problems such as equipment stoppage. Therefore, conventional methods have been devised to detect an abnormality in a transmission circuit. For example, a method has been considered in which an abnormality in a transmission circuit is detected when the level of a transmitted signal is below a certain value.

【発明が達成しようとする課題】[Problem to be achieved by the invention]

しかしながら、発明者らの経験によると、このような伝
送信号のレベルのみに基づく異常検知では、ピックアッ
プとプリアンプ間の配線の断線を検知することができな
い場合があった。 なお異常検知の精度を高めたものとして、例えば特開昭
54−94374、特開昭54−118116、特開昭
56−143963には、回路に何らかの試験信号を送
って、その健全性を調べる方法が開示されている。 しかしながら、これらの方法では、回路構成が複雑にな
り、試験信号の発生とその受信及び判断のためのソフト
、ハードを付加しなければならず、多数の検出部を有す
る大規模な設備監視装置に採用するのは困難であるとい
う問題点を有していた。 本発明は、前記従来の問題点を解消するべくなされたも
ので、断線やピックアップ、プリアンプ等の異常を簡単
且つ正確に検知することが可能な伝送回路の異常検知方
法を提供することを課題とする。
However, according to the experience of the inventors, such abnormality detection based only on the level of the transmission signal sometimes fails to detect a disconnection in the wiring between the pickup and the preamplifier. In order to improve the accuracy of abnormality detection, for example, Japanese Patent Application Laid-Open Nos. 54-94374, 1982-118116, and 1980-143963 disclose a method of sending some kind of test signal to a circuit to check its health. is disclosed. However, with these methods, the circuit configuration becomes complicated, and software and hardware must be added to generate test signals, receive them, and make judgments, making it difficult for large-scale equipment monitoring equipment with many detection units to be used. The problem was that it was difficult to adopt. The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a transmission circuit abnormality detection method that can easily and accurately detect abnormalities such as disconnections, pickups, and preamplifiers. do.

【課題を達成するための手段] 本発明は、伝送回路の異常を検知するに際して、伝送さ
れてきた信号のレベルが設定値以下であるか、又は、伝
送されてきた信号の生波形における商用周波数成分の占
める割合が設定値以上であるときに、伝送回路の異常を
検知することにより、前記課題を達成したものである。 【作用及び効果1 伝送信号のレベルのみに基づく異常検知を行っていた伝
送回路について、ピックアップとプリアンプ間のケーブ
ルが断線していたにも拘わらず異常が発見できない場合
があったので、発明者らは、人為的にケーブルを切断し
て伝送信号のレベルがどのように変化するか調査した。 その結果、ケーブルが断線した場合でも、その切断点を
アースさせたり、水の中へ入れると、異常検知の設定値
を越えるレベルの信号が生じることがあることがわかっ
た。そこで、従来の設定値の10倍の設定値を用いて、
ピックアップの状態を調査したところ、断線の他、コネ
クタ不良、ブリアンプ不良等がみつかり、又、伝送信号
のレベルもケーブルが断線しているにも拘わらず従来の
設定値の500倍以上のレベルの信号が発生している場
合もあり、断線を振動レベルの一定の値で判定すること
は困難であることが判明した。 そこで本発明者らが、断線しているものと通常のものに
ついて伝送信号の生波形を調査したところ、断線がない
場合には、第2図に示す如くであるのに対して、断線が
ある場合には第1図に示す如くとなり、断線がある場合
には、商用周波数(調査例では60土)成分が多く含ま
れることが判明した。 本発明は、上記のような知見に基づいてなされたもので
、伝送されてきた信号のレベルが設定値以下である場合
だけでなく、伝送されたきlN:、信号の生波形におけ
る商用周波数成分の占める割合が設定値以上であるとき
に、伝送回路の異常を検知するようにしている。従って
、周辺の雑音の影響を受は易く、断線等の異常が生じて
いても伝送信号のレベルがかなりのレベルとなる場合で
も、断線等の異常を簡単且つ的確に検知することができ
る。 【実施例】 以下図面を参照して、本発明の実施例を詳細に説明する
。 本実施例は、本発明を、圧延工場内搬送ロール系の振動
解析式による設備診断装置群に適用したものである。 この設備診断装置は、第3図に示す如く、搬送ロール(
図示省略)の多数の軸受10のそれぞれに配置された振
動ピックアップ12と、該振動ピックアップ12の出力
をプリアンプ16まで伝送するだめのシールド線14と
、前記プリアンプ16の出力を取込む複数の入出力端末
18と、例えばローカルエリアネットワーク(LAN)
20で結ばれた各入出力端末18から情報を集めて処理
するコンピュータ22とを備えている。 本発明による異常検知は、前記コンピュータ22により
行われる。即ち、このコンピュータ22では、各振動ピ
ックアップ12から伝送されてきた信号のレベルPが設
定値に1以下であるか、又は、伝送されてきた信号の生
波形における商用周波数fo(50又は6〇七)の成分
Q(fo−α< q<  f、+α、αは例えば0.1
ro)の占める割合Q/Pが設定値 K2以上であると
きに、シールド線14等の断線又は振動ピックアップ1
2、プリアンプ16等の異常と判断する。 前記設定値Kl、K2は例えば各振動ピックアップ12
に共通の一定値としたり、あるいは、各振動ピックアッ
プ毎に異なる値を設定することができる。 発明者が、第3図に示したような撮動ピックアップ12
−プリアンプ16の系統を144系統有する撮動解析式
設備診断装置群について、設定値に* =O,0ICT
O/sec 、設定値に2−50%として、本発明によ
る異常検知を行ったところ、下記第1表に示す如(とな
った。又、同じ設備診断装置群について、実際の異常の
有無を調査したところ、同じく第1表に示す如くであっ
た。 第1表 第1表から明らかな如く、信号レベルPが0゜01未満
とした従来法では、実際の異常個所11箇所のうち3箇
所しか検出することができず、不良検出率が3/11X
100−27%であるのに過ぎない。これに対して、商
用周波数成分も考慮した本発明によれば、3+6−9箇
所の異常を検出することができ、不良検出率が9/11
x100−81%まで高められた。 なお前記実施例においては、本発明が、圧延工場内搬送
ロール系の撮動解析式設備診断装置群に適用されていた
が、本発明の適用範囲はこれに限定されず、他の方式の
設備診断装置や監視装置、更には伝送回路一般の異常検
知にも同様に適用できることは明らかである。
[Means for Achieving the Object] The present invention detects whether the level of the transmitted signal is below a set value or the commercial frequency of the raw waveform of the transmitted signal when detecting an abnormality in the transmission circuit. The above problem is achieved by detecting an abnormality in the transmission circuit when the proportion of the components is equal to or higher than a set value. [Function and Effect 1] Regarding the transmission circuit, which used to detect abnormalities based only on the level of the transmission signal, there were cases in which no abnormality was detected even though the cable between the pickup and the preamplifier was disconnected. investigated how the level of the transmitted signal changes by artificially cutting the cable. As a result, it was found that even if a cable breaks, if the cut point is grounded or immersed in water, a signal at a level that exceeds the abnormality detection setting may be generated. Therefore, using a setting value 10 times the conventional setting value,
When we investigated the condition of the pickup, we found that there was a disconnection, a defective connector, a defective pre-amplifier, etc.Also, the level of the transmission signal was more than 500 times the previous setting value even though the cable was disconnected. It has been found that it is difficult to determine wire breakage based on a fixed value of vibration level. Therefore, the present inventors investigated the raw waveforms of the transmission signals for those with disconnections and normal ones, and found that when there is no disconnection, the waveform is as shown in Figure 2, whereas when there is a disconnection, the waveform is as shown in Figure 2. In the case shown in FIG. 1, it was found that when there is a disconnection, a large amount of commercial frequency (60 MHz in the survey example) components are included. The present invention has been made based on the above knowledge, and is applicable not only when the level of the transmitted signal is below the set value, but also when the level of the transmitted signal is lower than the set value. An abnormality in the transmission circuit is detected when the proportion is equal to or higher than a set value. Therefore, it is easily influenced by surrounding noise, and even if an abnormality such as a wire breakage occurs and the level of the transmission signal reaches a considerable level, the abnormality such as a wire breakage can be easily and accurately detected. Embodiments Examples of the present invention will be described in detail below with reference to the drawings. In this embodiment, the present invention is applied to a group of equipment diagnosis devices using a vibration analysis method for a conveyor roll system in a rolling mill. As shown in Fig. 3, this equipment diagnosis device uses transport rolls (
A vibration pickup 12 disposed on each of a large number of bearings 10 (not shown), a shielded wire 14 for transmitting the output of the vibration pickup 12 to a preamplifier 16, and a plurality of input/outputs for receiving the output of the preamplifier 16. Terminal 18 and, for example, a local area network (LAN)
A computer 22 that collects and processes information from each input/output terminal 18 connected by 20 is provided. Abnormality detection according to the present invention is performed by the computer 22. That is, in this computer 22, the level P of the signal transmitted from each vibration pickup 12 is less than the set value of 1, or the commercial frequency fo (50 or 607) in the raw waveform of the transmitted signal is set. ) component Q (fo-α<q< f, +α, α is, for example, 0.1
When the ratio Q/P occupied by
2. It is determined that there is an abnormality in the preamplifier 16, etc. The set values Kl and K2 are, for example, for each vibration pickup 12.
It is possible to set a common fixed value for each vibration pickup, or to set a different value for each vibration pickup. The inventor has developed a photographic pickup 12 as shown in FIG.
- For the imaging analysis equipment diagnostic equipment group having 144 systems of 16 preamplifiers, the setting value is * = O, 0ICT
O/sec, when the set value was set to 2-50%, abnormality detection according to the present invention was performed as shown in Table 1 below.In addition, for the same equipment diagnostic equipment group, the presence or absence of actual abnormality was determined. The results of the investigation were as shown in Table 1.As is clear from Table 1, in the conventional method where the signal level P was less than 0°01, 3 of the 11 actual abnormal locations were detected. The defect detection rate is 3/11X.
It is only 100-27%. On the other hand, according to the present invention, which takes commercial frequency components into consideration, it is possible to detect abnormalities in 3+6-9 locations, and the defect detection rate is 9/11.
x100-81%. In the above-mentioned embodiment, the present invention was applied to a group of photographic analysis type equipment diagnosis devices for conveyor rolls in a rolling mill, but the scope of application of the present invention is not limited to this, and is applicable to equipment of other types. It is clear that the present invention can be similarly applied to diagnostic equipment, monitoring equipment, and even abnormality detection in transmission circuits in general.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は、本発明の詳細な説明するための、伝送回路に
異常(断線)がある場合の伝送信号の生波形の例を示す
線図、 第2図は、同じく、異常がない場合の生波形の例を示す
線図、 第3図は、本発明が適用される振動解析式設備診断装置
の一例の構成を示すブロック線図である。 10・・・ロール軸受、 12・・・振動ピックアップ、 14・・・シールド線、 16・・・プリアンプ、 18・・・入出力端末、 22・・・コンピュータ、 P・・・伝送信号のレベル、 [0・・・商用周波数、 q・・・商用周波数成分、 Kl、K2・・・設定値。
FIG. 1 is a diagram showing an example of the raw waveform of a transmission signal when there is an abnormality (disconnection) in the transmission circuit, for detailed explanation of the present invention. Diagram showing an example of a raw waveform FIG. 3 is a block diagram showing the configuration of an example of a vibration analysis type equipment diagnosis device to which the present invention is applied. DESCRIPTION OF SYMBOLS 10... Roll bearing, 12... Vibration pickup, 14... Shield wire, 16... Preamplifier, 18... Input/output terminal, 22... Computer, P... Transmission signal level, [0...Commercial frequency, q...Commercial frequency component, Kl, K2...Setting value.

Claims (1)

【特許請求の範囲】[Claims] (1)伝送回路の異常を検知するに際して、伝送されて
きた信号のレベルが設定値以下であるか、又は、 伝送されてきた信号の生波形における商用周波数成分の
占める割合が設定値以上であるときに、伝送回路の異常
を検知することを特徴とする伝送回路の異常検知方法。
(1) When detecting an abnormality in the transmission circuit, either the level of the transmitted signal is below the set value, or the proportion of the commercial frequency component in the raw waveform of the transmitted signal is above the set value. A method for detecting an abnormality in a transmission circuit, the method comprising sometimes detecting an abnormality in the transmission circuit.
JP1094685A 1989-04-14 1989-04-14 Abnormality detecting method for transmission circuit Pending JPH02272919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1094685A JPH02272919A (en) 1989-04-14 1989-04-14 Abnormality detecting method for transmission circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1094685A JPH02272919A (en) 1989-04-14 1989-04-14 Abnormality detecting method for transmission circuit

Publications (1)

Publication Number Publication Date
JPH02272919A true JPH02272919A (en) 1990-11-07

Family

ID=14117059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1094685A Pending JPH02272919A (en) 1989-04-14 1989-04-14 Abnormality detecting method for transmission circuit

Country Status (1)

Country Link
JP (1) JPH02272919A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5082922A (en) * 1973-11-26 1975-07-04
JPS637827B2 (en) * 1980-04-04 1988-02-18 Toyota Motor Co Ltd

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5082922A (en) * 1973-11-26 1975-07-04
JPS637827B2 (en) * 1980-04-04 1988-02-18 Toyota Motor Co Ltd

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