JPH0346003A - Control circuit for driving unit - Google Patents
Control circuit for driving unitInfo
- Publication number
- JPH0346003A JPH0346003A JP18148689A JP18148689A JPH0346003A JP H0346003 A JPH0346003 A JP H0346003A JP 18148689 A JP18148689 A JP 18148689A JP 18148689 A JP18148689 A JP 18148689A JP H0346003 A JPH0346003 A JP H0346003A
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- Prior art keywords
- relay
- contact
- switches
- switch
- turned
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- 238000010586 diagram Methods 0.000 description 5
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- 230000005284 excitation Effects 0.000 description 4
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Abstract
Description
本発明は駆動機器の制御回路に関するものである。 The present invention relates to a control circuit for drive equipment.
例えば、セメントプラント等では、原材料の輸送のため
に、長いもので数に劇にもなる長距離コンベヤが用いら
れている。
このような長距離コンベヤでは、人間が搬送ローラに巻
込まれたり、コンベヤベルトがローラから外れかかって
いる等、何等かの異常が発生した場合、コンベヤを緊急
停止させる必要があり、このため従来から、コンベヤの
両側方に、コンベアに沿って２０〜３０ｍの間隔で非常
用ローブスイッチを多数設置し、非常用ローブスイッチ
を作動させることにより遠隔制御室内の制御盤に電気信
号を送り、コンベヤ駆動モータ（駆動機器）を緊急停止
させている。
駆動機器を緊急停止させることのできる従来の制御回路
を第４図〜第６図により説明すると、ｌａ、 ｌｂ、
ｌｃは直列に接続された非常用ローブスイッチ等の多数
のスイッチ、２はスイッチｌａ、 ｌｂ。
ｌｃと直列に配設された駆動モータ等の駆動機器の起動
指令接点、３はスイッチｌａ、 Ｉｂ、 ｌｃ及び起動
指令接点２に対し直列に配列され、全てのスイッチｌａ
、 ｌｂ、 ｌｃ及び起動指令接点２が入ったら励磁さ
れるリレーであり、駆動機器を起動する条件が全て整っ
たことを検出するためのものである。
４ａ、４ｂ、４ｃはスイッチ１ａ、１ｂ、１ｃに対し並
列に接続されると共に互に並列に接続されたスイッチで
あり、各スイッチ４ａ、４ｂ、４ｃはスイッチｔａ、
ｌｂ。
１ｃと機械的に連結され、スイッチｌａ、１ｂ、１ｃが
入った場合にはスイッチ４ａ、４ｂ、４ｃが切れ、スイ
ッチｌａ、 Ｉｂ、 ｌｃが切れた場合にはスイッチ４
ａ、４ｂ、４ｃが入るよう構成されている。
５はスイッチ４ａ、４ｂ、４ｃに対し直列に接続され、
スイッチ４ａ又は４ｂ或いは４ｃが入ったら励磁され、
非常用スイッチが作動したことを検出するためのリレー
である。
而して、各スイッチ及びリレーは、電源のプラス側母線
６とマイナス側母線７間に接続され、マイナス側母線７
は大地８に接地されている。
リレー３は、起動信号回路１２に設けた接点３−１を有
し、リレー３が無励磁の場合は接点３−１は切れており
、リレー３が励磁されると接点３−！は入り、駆動機器
に起動信号を与え得るようになっている。又リレー５は
、スイッチ作動信号回路１３に設けた接点５−１を有し
、リレー５が無励磁の場合は接点５−１は切れており、
リレー５が励磁されると接点５−１は入り、警報器を介
して警報を与え得るようになっている。
上記制御回路では、正常状態下では、スイッチｌａ、
ｌｂ、 ｌｃは全て入っており、スイッチ４ａ、４ｂ。
４ｃは全て切れている。
而して、起動指令接点２が入れられるとリレー３が励磁
され、このため接点Ｌ＋が入り、起動信号回路１２から
駆動モータ等の駆動機器に起動信号が与えられ、駆動機
器が起動される。
緊急停止時には、スイッチ１ａ、ｌｂ、ｌｃのうち何れ
かを切る。例えばスイッチｔａを切ると、リレー３が無
励磁となり接点３−１が切れるため、駆動機器は停止す
る。又スイッチｌａが切れると、スイッチ４ａが入り、
リレー５が励磁されるため、接点５−１が入り、スイッ
チ作動信号回路１３を介し警報器から警報が発せられる
。
［発明が解決しようとする課題］
上記制御回路では、スイッチへの接続ケーブル条長が長
く（約３Ｋｍ）、Ｌかも駆動機器を停止させるためのス
イッチが直列に多数（約５０個）接続されているため、
この回路信号を駆動機器の起動停止のインターロックに
使用する場合、各スイッチの接点不良及び誤動作、並に
上記制御回路の地絡事故によりしばしば誤信号を発し、
駆動機器の円滑な運転に支障を来たす虞れがあった。す
なわち、例えば、スイッチの誤動作により駆動機器はイ
ンターロックで停止したが、スイッチが動作したことを
示す警報が出す、トラブルの解決に手間どる。
本発明は上述の実情に鑑み、駆動モータ等の駆動機器を
円滑に運転し得るようにすることを目的としてなしたも
のである。
［課題を解決するための手段］
本発明は複数のスイッチｌａ、 ｌｂ、Ｌｃ及び起動指
令接点２並にリレー３を電流流れ方向り上流側から下流
側に向けて直列に接続すると共に、起動指令接点２及び
リレー３に対して並列にリレー９を接続し、前記複数の
スイッチｌａ、１ｂ、１ｅに対し並列で且つ互に並列な
複数のスイッチ４ａ。
４ｂ 、 ４ｃを、前記各スイッチ１ａ、ｌｂ、１ｃが
入っている場合には切れ、切れている場合には入るよう
、各スイッチｌａ、 ｌｂ、 ｌｅに対し機械的に連結
すると共に前記各スイッチ４ａ、４ｂ、４ｃに対しリレ
ー５を直列に接続し、前記リレー３が励磁されたら入り
無励磁になったら切れる接点３−１を起動信号回路１２
に接続し、前記リレー５が励磁されたら入り無励磁にな
ったら切れる接点５−１をスイッチ作動信号回路１３に
接続し、リレー５．９が励磁されたら切れ無励磁になっ
たら入る接点５−２゜９−２をスイッチ異常検出信号回
路１４に直列に接続したものである。又本発明では、前
記起動指令接点２及びリレー３と、リレー９とに対し並
列に表示灯ｌＯを接続し、前記リレー５に対し並列に表
示灯Ｕを接続することもできる。
【作 ′用］
起動指令接点２が入ると、リレー３が励磁されて起動信
号回路１２の接点３−１が入り、駆動機器が起動される
。スイッチ１ａ又はｌｂ若しくはｌｃが切られると、ス
イッチ４ａ又は４ｂ若しくは４ｃが入り、リレー３が無
励磁になると共にリレー５が励磁される。このため起動
信号回路１２の接点３−１は切れて駆動機器は停止し、
スイッチ作動信号回路１３の接点５−１が入って警報が
発せられる。
スイッチｌａ、 ｌｂ、 Ｉｃの接点不良又は誤動作成
いは地絡事故が発生すると、リレー９の励磁電圧が下降
してスイッチ異常検出信号回路１４の接点９−２が入り
、スイッチ４ａ、４ｂ、４ｃの作動検出用に入っている
接点５−２と接続状態になり、警報が発せられる。
表示灯１０．１１を設けた場合、駆動機器の運転状態が
正常なら表示灯１ｏは点灯し表示灯ｌｌは消え、緊急停
止時にはスイッチｌａ又はｌｂ若しくは１ｃが切られス
イッチ４ａ又は４ｂ若しくは４ｃが入るため表示灯１０
は消え、表示灯１１が点灯する。表示灯１０．１１が暗
かったりちらついたり或いは消えてはならない表示灯が
消えた場合は、スイッチｌａ、 ｌｂ、 ｌｃの接点不
良又は誤動作成いは地絡事故が生じている。従って、表
示灯ｔｏ、ｔｔを設けた場合、目視によってもトラブル
の原因を究明することができる。
［実 施 例］
以下、本発明の実施例を添付図面を参照しっつ説明する
。
第１図及び第２図は本発明の一実施例で、図中第４図に
示すものと同一のものには同一の符号を付しである。又
、第５図及び第６図に示す起動信号回路１２及びスイッ
チ作動信号回路１３は本発明においてもそのまま使用す
る。
第１図の制御回路では、新たにリレー９、発光ダイオー
ド或いは白熱ランプ等の表示灯１Ｏ１１１が加えられて
いる。而して、リレー９及び表示灯１０は、起動指令接
点２及びリレー３に対し並列に接続されると共にスイッ
チＬＢ、 ｌｂ、 ｌｃに対し直列に接続され、リレー
９及び表示灯１１同志も並列に接続されている。又表示
灯１１はリレー５に対しては並列に接続され、スイッチ
４ａ、４ｂ。
４ｃに対しては直列に接続されている。
リレー５及び９は、夫々スイッチ異常検出信号回路１４
に設けた接点５−２及び９−２を有すると共に接点５−
２と９−２は直列に接続され、リレー５が無励磁の場合
は接点５−１は切れ、接点５−２は入り、励磁されたら
接点５−１は入り、接点５−２は切れ、リレー９が無励
磁の場合は接点９−２は入り、励磁されたら接点９−２
は切れるように構成されている。
上記制御回路では、正常状態下にあっては、第４図の制
御回路と同様スイッチ１ａ、１ｂ、１ｃは全て入ってお
り、スイッチ４ａ、４ｂ、４ｃは全て切れている。
而して、起動指令接点２が入ると、リレー３゜９が励磁
されると共に表示灯ｌＯは点灯する。又リレー３が励磁
されると接点３−が入り、起動信号回路１２から起動信
号が発せられて駆動モータ等駆動機器が起動され、リレ
ー９が励磁されると接点９−２は切れる。
又スイッチ４ａ、４ｂ、４ｃは切れているため、表示灯
１１は点灯せず、リレー５は励磁されないため接点５−
１は切れ、接点５−２は入っている。
現場で人間が搬送ローラに巻込まれたりコンベヤベルト
がローラから外れかかっている等の異常が発生し、駆動
モータ等の駆動機器を緊急停止させる必要が生じた場合
には、スイッチｌａ。
）ｂ、Ｌｃのうち、何れかを切る。例えばスイッチｌａ
を切ると、リレー３が無励磁になり、接点３−１が切れ
るため、駆動機器は停止し、表示灯１０は消え、リレー
９が無励磁になって接点９−２が入る。又、スイッチｌ
ａを切ることによりスイッチ４ａが入り、これによって
リレー５が励磁されると共に表示灯１１が点灯し、リレ
ー５の励磁により、接点５−１が入り、接点５−２が切
れる。
接点５−１が入るとスイッチ作動信号回路１３を介し警
報器により警報が発せられる。
上述の制御回路では、スイッチ１ａ、１ｂ、１ｃの接点
不良又は誤動作成いは地絡事故等の異常が生じていない
場合で且つ駆動機器が運転されている場合には、接点５
−２は入っているが、接点９−２は切れているため、ス
イッチ異常検出信号回路１４にスイッチ異常検出信号は
発生せず、又緊急時に駆動機器が停止させられた場合で
も上記異常が発生しない場合には、接点９−２は入るが
接点５−２が切れるため、スイッチ異常検出信号は発生
しない。
而して、第４図の制御回路では、駆動装置がスイッチｌ
ａ、Ｌｂ、１ｃの何れかを切って停止したとしても接点
５−１が入らず、警報が発せられないことがある。この
場合には運転室の運転員は現場のスイッチｌａ、 ｌｂ
、 ｌｃ及び４ａ、４ｂ、４ｃは正常（リレー５が無励
磁）と判断してしまい、異常の早期原因究明が困難であ
る。ところが、リレー５が無励磁でスイッチｌａ、 ｌ
ｂ、 Ｌｃは正常であると判断されてもリレー９の励磁
電圧が復帰電圧よりも下っているということは、回路中
に次のような異常が発生しているものと考えられる。
■ スイッチｌａ、 ｌｂ、 ｌｃが機械的な誤動作に
より開となっているか、開になりかかつている。
或いはスイッチｌａ、 ｌｂ、 ｌｃがチャタリングを
起こしている。
■ スイッチｌａ、 ｌｂ、 ｌｃが経年変化等で接点
不良（回路抵抗増大）を起こしている。
■ 制御回路のプラス側母線Ｂが地絡されているか、地
絡されかかっている。
■ 実際に現場で異常が発生し、非常用スイッチを作動
させたが、スイッチ４ａ、４ｂ、４ｃが不良で入らない
。
上述の■■■■のうち何れかの異常が発生すると、リレ
ー９の励磁電圧が下降するため接点９−２が入り、又リ
レー５はスイッチ４ａ、４ｂ、４ｃが入っていないため
無励磁であり、接点５−２は入った状態になっている。
このため接点５−２＋９−２が同時に入った状態になり
、スイッチ異常検出信号回路１４にスイッチ異常検出信
号が送られ、警報が発生される。
又、表示灯１０．１１により目視によっても上記■■■
■の異常が発生していることを確認できる。すなわち、
駆動機器が正常状態で運転されていれば、スイッチｌａ
、 ｌｂ、 ｌｃは全て人っており、スイッチ４ａ、４
ｂ、４ｃは切れているため、表示灯ｌＯは点灯している
が、表示灯１１は消えており、又現場での上述の異常の
発生によりスイッチｌａ。
ｌｂ、１ｃの何れかが切られ、スイッチ４ｍ、４ｂ、４
ｃが入ると、表示灯１０は消え、表示灯１１は点灯する
。
この場合には、上述の■■■■の異常は発生していない
。しかし、表示灯１０．１１の点灯、消滅の状態が上述
の状態以外の場合は■■■■のうち何れかの異常が発生
している。表示灯１０．１１の点灯、消滅と異常の有無
の関係を示すと第３図の表のようになる。第３図中○は
正常、×は異常を表わしている。
各表示灯１０．１１の状態により次のような異常が考え
られる。
■表示灯１０．１１の何れも点灯の場合。
スイッチ４ａ、４ｂ、４ｃのうち何れかが入ったのに対
応するスイッチｌａ、 ｌｂ、 ｌｃが切れない。
■表示灯１０．１１は点灯するが暗い。
回路電圧は零ではないが、リレー９．５の復帰電圧より
低い。
■表示灯１０．１１がちらつく。
スイッチｌａ、 ｔｂ、 ｌｃ、４ａ、４ｂ、４ｃがチ
ャタリングを起こしているか、或いは電源のプラス側が
地絡しかかっている。
■表示灯ｉｏ、ｔｔの何れも消える。
スイッチ１ａ、ｌｂ、ｌｃのうちのどれかが誤動作によ
り開状態となっているか、或いは制御回路のケーブルが
断線するか制御回路の電源が切られた場合。
なお、本発明の実施例では、現場で直列に接続されるス
イッチが３箇所の場合について説明したが、複数筒なら
餅筒としても実施できること、現場の駆動機器としては
、長距離コンベヤの駆動モータに限らず、緊急停止させ
る必要のある駆動モータに対して適用可能なこと、その
池水発明の要旨を逸脱しない範囲内で種々変更を加え得
ること、等は勿論である。
【発明の効果］
本発明の駆動機器の制御回路によれば、スイッチの接点
不良又は誤動作、或いは地絡事故等の異常が発生した場
合に該異常を確実に検出できるため、設備の円滑な運転
が可能になるという優れた効果を奏し得る。For example, in cement plants and the like, long-distance conveyors, which are long and can be quite numerous, are used to transport raw materials. With such long-distance conveyors, if any abnormality occurs, such as a person getting caught in the conveyor rollers or the conveyor belt coming off the rollers, the conveyor must be brought to an emergency stop. , many emergency lobe switches are installed on both sides of the conveyor at intervals of 20 to 30 meters along the conveyor, and by activating the emergency lobe switches, an electric signal is sent to the control panel in the remote control room, and the conveyor drive motor is activated. (driving equipment) is brought to an emergency stop. A conventional control circuit that can make an emergency stop of a driving device is explained using FIGS. 4 to 6. La, lb,
lc is a number of switches such as emergency lobe switches connected in series, and 2 is switches la and lb. A start command contact 3 for drive equipment such as a drive motor arranged in series with the lc is arranged in series with the switches la, Ib, lc and the start command contact 2, and all switches la
, lb, lc, and start command contact 2 are turned on, and is used to detect that all conditions for starting the drive equipment have been met. 4a, 4b, and 4c are switches that are connected in parallel to the switches 1a, 1b, and 1c, and are also connected in parallel to each other, and each switch 4a, 4b, and 4c is a switch ta,
lb. 1c, when switches la, 1b, and 1c are turned on, switches 4a, 4b, and 4c are turned off, and when switches la, Ib, and lc are turned off, switch 4 is turned off.
It is configured so that a, 4b, and 4c can be inserted. 5 is connected in series to the switches 4a, 4b, 4c,
When switch 4a, 4b or 4c is turned on, it is energized,
This is a relay to detect when the emergency switch is activated. Each switch and relay is connected between the positive bus 6 and the negative bus 7 of the power supply, and the negative bus 7
is grounded to earth 8. The relay 3 has a contact 3-1 provided in the starting signal circuit 12. When the relay 3 is not energized, the contact 3-1 is disconnected, and when the relay 3 is energized, the contact 3-! is turned on so that it can provide a start signal to the drive equipment. The relay 5 also has a contact 5-1 provided in the switch activation signal circuit 13, and when the relay 5 is not energized, the contact 5-1 is disconnected.
When the relay 5 is energized, the contact 5-1 is closed so that an alarm can be given via the alarm. In the above control circuit, under normal conditions, the switches la,
lb and lc are all on, switches 4a and 4b. All 4c are cut. When the start command contact 2 is turned on, the relay 3 is energized, so that the contact L+ is turned on, and a start signal is given from the start signal circuit 12 to a drive device such as a drive motor, and the drive device is started. At the time of emergency stop, any one of the switches 1a, lb, and lc is turned off. For example, when the switch ta is turned off, the relay 3 becomes de-energized and the contact 3-1 is turned off, so that the driving equipment stops. Also, when switch la is turned off, switch 4a is turned on,
Since the relay 5 is energized, the contact 5-1 is turned on, and an alarm is issued from the alarm device via the switch activation signal circuit 13. [Problems to be Solved by the Invention] In the above control circuit, the length of the cable connected to the switch is long (approximately 3 km), and a large number of switches (approximately 50 pieces) are connected in series to stop the drive equipment. Because there are
When this circuit signal is used as an interlock to start and stop driving equipment, incorrect signals are often generated due to contact failures and malfunctions of each switch, as well as ground faults in the control circuit.
There was a risk that the smooth operation of the drive equipment would be hindered. That is, for example, although the drive equipment is stopped due to an interlock due to a malfunction of a switch, an alarm indicating that the switch has been operated is issued, making it difficult to resolve the problem. The present invention has been made in view of the above-mentioned circumstances, and is aimed at enabling smooth operation of drive equipment such as a drive motor. [Means for Solving the Problems] The present invention connects a plurality of switches la, lb, Lc, starting command contact 2, and relay 3 in series from the upstream side to the downstream side in the direction of current flow, and A relay 9 is connected in parallel to the contact point 2 and the relay 3, and a plurality of switches 4a are connected in parallel to the plurality of switches la, 1b, and 1e and in parallel to each other. 4b and 4c are mechanically connected to the switches la, lb, and le so that the switches 1a, lb, and 1c are turned off when they are turned on, and turned on when they are turned off, and the switches 4a and 4c are , 4b, 4c are connected in series with a relay 5, and a contact 3-1 that is turned on when the relay 3 is energized and disconnected when it is de-energized is connected to a start signal circuit 12.
A contact 5-1 that opens when the relay 5 is energized and breaks when it is de-energized is connected to the switch operation signal circuit 13, and a contact 5-1 that opens when the relay 5.9 is energized and breaks when it becomes de-energized. 2.9-2 is connected in series to the switch abnormality detection signal circuit 14. Further, in the present invention, an indicator light IO may be connected in parallel to the start command contact 2, the relay 3, and the relay 9, and an indicator light U may be connected in parallel to the relay 5. [Operation] When the start command contact 2 is turned on, the relay 3 is energized, the contact 3-1 of the start signal circuit 12 is turned on, and the driving equipment is started. When the switch 1a, lb, or lc is turned off, the switch 4a, 4b, or 4c is turned on, and the relay 3 is de-energized and the relay 5 is energized. For this reason, the contact 3-1 of the start signal circuit 12 is disconnected and the drive equipment stops.
Contact 5-1 of switch activation signal circuit 13 is turned on and an alarm is issued. When a contact failure or malfunction or a ground fault occurs in the switches la, lb, and Ic, the excitation voltage of the relay 9 decreases and the contact 9-2 of the switch abnormality detection signal circuit 14 is turned on, causing the switches 4a, 4b, and 4c to close. It becomes connected to the contact 5-2 included for detecting operation, and an alarm is issued. When indicator lights 10.11 are provided, if the operating condition of the driving equipment is normal, indicator light 1o lights up and indicator light ll goes out, and in the event of an emergency stop, switch la, lb, or 1c is turned off and switch 4a, 4b, or 4c is turned on. indicator light 10
disappears, and the indicator light 11 lights up. If the indicator lights 10.11 are dark or flickering, or if an indicator light that should not go out goes out, there is a contact failure or malfunction in the switches LA, LB, LC, or a ground fault has occurred. Therefore, when the indicator lights to and tt are provided, the cause of the trouble can be determined by visual inspection. [Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 show an embodiment of the present invention, in which the same parts as shown in FIG. 4 are given the same reference numerals. Further, the start signal circuit 12 and switch actuation signal circuit 13 shown in FIGS. 5 and 6 are used as they are in the present invention. In the control circuit of FIG. 1, a relay 9 and an indicator light 1O111 such as a light emitting diode or an incandescent lamp are newly added. Thus, the relay 9 and the indicator light 10 are connected in parallel to the start command contact 2 and the relay 3, and in series to the switches LB, lb, and lc, and the relay 9 and the indicator light 11 are also connected in parallel. It is connected. Further, the indicator light 11 is connected in parallel to the relay 5, and the switches 4a and 4b. 4c is connected in series. Relays 5 and 9 are connected to switch abnormality detection signal circuit 14, respectively.
It has contacts 5-2 and 9-2 provided at contact 5-2 and 9-2.
2 and 9-2 are connected in series, when the relay 5 is not energized, the contact 5-1 is turned off and the contact 5-2 is turned on, and when the relay 5 is energized, the contact 5-1 is turned on and the contact 5-2 is turned off. When the relay 9 is not energized, the contact 9-2 is closed, and when the relay 9 is energized, the contact 9-2 is closed.
is designed to be cut. In the above control circuit, under normal conditions, the switches 1a, 1b, and 1c are all on, and the switches 4a, 4b, and 4c are all off, similar to the control circuit of FIG. When the start command contact 2 is turned on, the relay 3.9 is energized and the indicator lamp 10 is turned on. Further, when the relay 3 is energized, the contact 3- is turned on, a start signal is issued from the start signal circuit 12 to start a driving device such as a drive motor, and when the relay 9 is energized, the contact 9-2 is turned off. Also, since the switches 4a, 4b, and 4c are off, the indicator light 11 does not light up, and the relay 5 is not energized, so the contact 5-
1 is open and contact 5-2 is closed. If an abnormality occurs at the site, such as a person being caught in the conveyor belt or the conveyor belt is about to come off the roller, and it is necessary to emergency stop the driving equipment such as the drive motor, switch 1a is activated. ) Cut either b or Lc. For example switch la
When the relay 3 is turned off, the relay 3 becomes non-energized and the contact 3-1 is cut off, so the driving equipment stops, the indicator light 10 goes out, and the relay 9 becomes non-energized and the contact 9-2 is turned on. Also, switch l
By turning off the switch 4a, the switch 4a is turned on, which excites the relay 5 and turns on the indicator light 11. The excitation of the relay 5 turns on the contact 5-1 and turns off the contact 5-2. When the contact 5-1 is turned on, an alarm is issued by the alarm via the switch activation signal circuit 13. In the above-mentioned control circuit, when there is no abnormality such as contact failure or malfunction of the switches 1a, 1b, and 1c or a ground fault, and when the drive equipment is in operation, the contact 5
-2 is on, but contact 9-2 is off, so no switch abnormality detection signal is generated in the switch abnormality detection signal circuit 14, and even if the drive equipment is stopped in an emergency, the above abnormality occurs. If not, contact 9-2 is closed but contact 5-2 is closed, so no switch abnormality detection signal is generated. Therefore, in the control circuit shown in FIG.
Even if any one of a, Lb, and 1c is turned off to stop the operation, the contact 5-1 may not close and the alarm may not be issued. In this case, the operator in the cab should use the on-site switches la and lb.
, lc, 4a, 4b, and 4c are judged to be normal (relay 5 is not energized), making it difficult to quickly determine the cause of the abnormality. However, relay 5 is not energized and switches la and l are not activated.
Even if it is determined that B and Lc are normal, the fact that the excitation voltage of relay 9 is lower than the return voltage suggests that the following abnormality has occurred in the circuit. ■ Switches la, lb, and lc are open or about to open due to mechanical malfunction. Or switches LA, LB, and LC are causing chattering. ■ Switches LA, LB, and LC have developed contact failure (increased circuit resistance) due to aging. ■ The positive bus B of the control circuit is grounded or is about to be grounded. ■ An abnormality actually occurred at the site and the emergency switch was activated, but switches 4a, 4b, and 4c were defective and would not turn on. If any of the above-mentioned abnormalities occur, the excitation voltage of relay 9 decreases, so contact 9-2 is turned on, and relay 5 is not energized because switches 4a, 4b, and 4c are not turned on. Yes, the contact 5-2 is in the closed state. As a result, contacts 5-2 and 9-2 are simultaneously closed, a switch abnormality detection signal is sent to the switch abnormality detection signal circuit 14, and an alarm is generated. In addition, the above ■■■
■It can be confirmed that the above abnormality has occurred. That is,
If the drive equipment is operating normally, switch la
, lb, and lc are all occupied, and switches 4a and 4
Since indicators b and 4c are out, indicator light lO is on, but indicator light 11 is off, and switch la is turned off due to the above-mentioned abnormality occurring at the site. Either lb or 1c is turned off and switches 4m, 4b, 4
When c is entered, the indicator light 10 goes out and the indicator light 11 lights up. In this case, the above-mentioned abnormality ■■■■ does not occur. However, if the lighting and extinguishing states of the indicator lamps 10 and 11 are other than the above-mentioned states, one of the following abnormalities has occurred. The table in FIG. 3 shows the relationship between the lighting and extinguishing of indicator lights 10 and 11 and the presence or absence of an abnormality. In FIG. 3, ◯ indicates normality, and × indicates abnormality. The following abnormalities may occur depending on the status of each indicator light 10.11. ■If both indicator lights 10 and 11 are lit. Although one of the switches 4a, 4b, and 4c is turned on, the corresponding switch la, lb, and lc cannot be turned off. ■Indicators 10 and 11 light up but are dark. Although the circuit voltage is not zero, it is lower than the return voltage of relay 9.5. ■Indicator light 10.11 flickers. Switches la, tb, lc, 4a, 4b, and 4c are chattering, or the positive side of the power supply is about to have a ground fault. ■Both indicator lights io and tt go out. If any of the switches 1a, lb, and lc is open due to malfunction, or the cable of the control circuit is disconnected, or the power of the control circuit is turned off. In addition, in the embodiment of the present invention, the case where three switches are connected in series at the site has been explained, but if there are multiple tubes, it can also be implemented as a rice cake tube. It goes without saying that the present invention is not limited to this invention, and that it can be applied to drive motors that require an emergency stop, and that various changes can be made without departing from the gist of the invention. [Effects of the Invention] According to the control circuit for drive equipment of the present invention, when an abnormality such as a contact failure or malfunction of a switch or a ground fault occurs, the abnormality can be reliably detected, so that the equipment can operate smoothly. This has the excellent effect of making it possible.
第１図は本発明の駆動機器の制御回路の一実施例の回路
図、第２図は本発明の駆動機器の制御回路におけるスイ
ッチ異常検出信号回路の回路図、第３図は本発明の駆動
機器の制御回路における表示灯の点灯、ｔｒＪ滅と異常
の有無の関係を表わす表、第４図は従来の駆動機器の制
御回路の回路図、第５図は本発明及び従来の駆動機器の
制御回路における起動信号回路の回路図、第６図は本発
明及び従来の駆動機器の制御回路におけるスイッチ作動
信号回路の回路図である。
図中１ａ、 ｌｂ、 ｌｃはスイッチ、２は起動指令接
点、３はリレー ３−１は接点、４ａ、４ｂ、４ｃはス
イッチ、５はリレー ！１４ ＋５−２は接点、９はリ
レー９−２は接点、１０．１１は表示灯、１２は起動信
号回路、１３はスイッチ作動信号回路、１４はスイッチ
異常検出信号回路、Ｄは電流流れ方向を示す。FIG. 1 is a circuit diagram of an embodiment of a control circuit for a drive device according to the present invention, FIG. 2 is a circuit diagram of a switch abnormality detection signal circuit in the control circuit for a drive device according to the present invention, and FIG. 3 is a circuit diagram of an embodiment of a control circuit for a drive device according to the present invention. A table showing the relationship between the lighting of indicator lights, trJ extinction, and the presence or absence of abnormality in the control circuit of the equipment. Fig. 4 is a circuit diagram of the control circuit of the conventional drive equipment. Fig. 5 is the control circuit of the present invention and the conventional drive equipment. FIG. 6 is a circuit diagram of a switch actuation signal circuit in a control circuit of a drive device according to the present invention and a conventional drive device. In the figure, 1a, lb, and lc are switches, 2 is a start command contact, 3 is a relay, 3-1 is a contact, 4a, 4b, and 4c are switches, and 5 is a relay! 14 +5-2 is a contact, 9 is a relay 9-2 is a contact, 10.11 is an indicator light, 12 is a start signal circuit, 13 is a switch operation signal circuit, 14 is a switch abnormality detection signal circuit, D is a current flow direction show.
Claims (1)
２並にリレー３を電流流れ方向Ｄ上流側から下流側に向
けて直列に接続すると共に、起動指令接点２及びリレー
３に対して並列にリレー９を接続し、前記複数のスイッ
チ１ａ、１ｂ、１ｃに対し並列で且つ互に並列な複数の
スイッチ４ａ、４ｂ、４ｃを、前記各スイッチ１ａ、１
ｂ、１ｃが入っている場合には切れ、切れている場合に
は入るよう、各スイッチ１ａ、１ｂ、１ｃに対し機械的
に連結すると共に前記各スイッチ４ａ、４ｂ、４ｃに対
しリレー５を直列に接続し、前記リレー３が励磁された
ら入り無励磁になったら切れる接点３＿−＿１を起動信
号回路１２に接続し、前記リレー５が励磁されたら入り
無励磁になったら切れる接点５＿−＿１をスイッチ作動
信号回路１３に接続し、リレー５、９が励磁されたら切
れ無励磁になったら入る接点５＿−＿２、９＿−＿２を
スイッチ異常検出信号回路１４に直列に接続したことを
特徴とする駆動機器の制御回路。 ２）前記起動指令接点２及びリレー３と、リレー９とに
対し並列に表示灯１０を接続し、前記リレー５に対し並
列に表示灯１１を接続した請求項１に記載の駆動機器の
制御回路。[Claims] 1) A plurality of switches 1a, 1b, 1c, a start command contact 2, and a relay 3 are connected in series from the upstream side to the downstream side in the current flow direction D, and the start command contact 2 and the relay A relay 9 is connected in parallel to the switch 3, and a plurality of switches 4a, 4b, 4c are connected in parallel to the plurality of switches 1a, 1b, 1c and in parallel to each other.
A relay 5 is connected mechanically to each of the switches 1a, 1b, and 1c, and is connected in series to each of the switches 4a, 4b, and 4c, so that the switches 1a, 1b, and 1c turn off when they are on, and turn on when they are off. Connect the contact 3_-_1 that opens when the relay 3 is energized and breaks when it is de-energized to the start signal circuit 12, and connect the contact 5--_1 that opens when the relay 5 is energized and breaks when it becomes de-energized. A drive characterized in that contacts 5_-_2, 9_-_2 which are connected to a switch operation signal circuit 13 and which are turned off when the relays 5 and 9 are energized and which are turned on when not energized are connected in series to the switch abnormality detection signal circuit 14. Equipment control circuit. 2) A control circuit for a driving device according to claim 1, wherein an indicator light 10 is connected in parallel to the start command contact 2, the relay 3, and the relay 9, and an indicator light 11 is connected in parallel to the relay 5. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1181486A JP2611439B2 (en) | 1989-07-13 | 1989-07-13 | Drive device control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1181486A JP2611439B2 (en) | 1989-07-13 | 1989-07-13 | Drive device control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0346003A true JPH0346003A (en) | 1991-02-27 |
| JP2611439B2 JP2611439B2 (en) | 1997-05-21 |
Family
ID=16101606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1181486A Expired - Lifetime JP2611439B2 (en) | 1989-07-13 | 1989-07-13 | Drive device control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2611439B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57101316A (en) * | 1980-12-15 | 1982-06-23 | Matsushita Electric Works Ltd | Alternate operation relay unit |
-
1989
- 1989-07-13 JP JP1181486A patent/JP2611439B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57101316A (en) * | 1980-12-15 | 1982-06-23 | Matsushita Electric Works Ltd | Alternate operation relay unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2611439B2 (en) | 1997-05-21 |
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