JP3637686B2

JP3637686B2 - Electric shutter malfunction prevention device

Info

Publication number: JP3637686B2
Application number: JP15710296A
Authority: JP
Inventors: 宏幸尾登; 幸彦佐々木
Original assignee: Bunka Shutter Co Ltd
Current assignee: Bunka Shutter Co Ltd
Priority date: 1996-06-18
Filing date: 1996-06-18
Publication date: 2005-04-13
Anticipated expiration: 2016-06-18
Also published as: JPH102172A

Description

【０００１】
【発明の属する技術分野】
本発明は、電動シャッターに設けられ開閉を制御する制御用接続線の損傷短絡による電動シャッターの誤動作を防止する電動シャッターの誤動作防止装置に関する。
【０００２】
【従来の技術】
電動シャッターを開閉制御する制御装置は、シャッター巻取り部が設けられるシャッターケース内に設置されることが多い。
このため、開閉操作用の操作部や、他の機器との連動操作手段等とは離れた位置に設置される。このため、制御装置と操作部とは電線などの制御用接続線によって接続されている。
【０００３】
【発明が解決しようとする課題】
この制御用接続線は、建物の壁に沿って配線されたり、建物内部を配線されるため、施工時に誤って傷をつけたり、後の工事で他の建築部材から加圧やくぎ打ちを受けるなど、制御用接続線の心線が短絡するような損傷を受けるおそれがある。
また、災害時の炎や熱によっても制御用接続線が高温になり、電線が溶けて心線が内部溶融（短絡）することが考えられる。
これら、制御用接続線が短絡すると、操作部で操作していなくとも制御装置は開閉操作されたと判断してしまい事故の原因となったり防犯上の問題を生じる虞れがある。
【０００４】
本発明は、上記事情に鑑みてなされたものであり、操作部で操作されたものであるか否かを識別することにより、制御用接続線が短絡してもシャッターが誤動作することを防止して、シャッター開閉をより安全に行える電動シャッターの誤動作防止装置を提供することを目的としている。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の電動シャッターの誤動作防止装置は、請求項１記載のように、開閉機を駆動制御してシャッターを開閉させる開閉制御手段と、電動シャッターを開閉操作する操作スイッチを有する操作手段２とが離れた位置に設置され、前記開閉制御手段と前記操作手段２とが制御用信号線６を介して接続された電動シャッターであって、
前記操作手段２の前記操作スイッチの近傍における前記制御用信号線６に介挿され、該制御用信号線６を流れる制御用信号を加工して出力する信号変換手段７と、
前記開閉制御手段に設けられ、前記制御用信号の内容に基づき、該制御用信号が前記操作手段２を介して信号変換手段７で加工されたものか否かを判別し、前記操作スイッチの操作状態及び前記制御用信号線６の短絡を検出し、前記操作スイッチが操作されたことを検出すると前記操作スイッチの操作に対応する検出信号を前記開閉制御手段に出力し、前記制御用信号線６の短絡検出時には前記開閉制御手段に対し開閉機の駆動を安全に制御させるための短絡検出信号を出力する操作検出手段３と、
を具備することを特徴とする。
【０００６】
また、請求項２記載のように、所定電圧で動作する開閉機の近傍に設けられ、該開閉機に対し駆動信号を出力してシャッターを開放／閉鎖／停止させる開閉制御手段と、
前記開閉制御手段から離れた操作箇所に配置され、前記シャッターを開放／閉鎖／停止操作するための各操作スイッチが設けられ、各操作スイッチに対応した制御用信号線を介して制御用信号を出力する操作手段と、
前記操作手段内部に設けられ、該操作手段の前記操作スイッチの近傍における前記制御用信号線に介挿され、該制御用信号線を流れる制御用信号を加工して、前記開閉制御手段へ出力する信号変換手段と、
前記開閉制御手段の入力段に設けられ、前記制御用信号に基づき前記操作手段の開放／閉鎖／停止の各操作スイッチの操作に対応する検出信号を前記開閉制御手段に出力し、また、前記操作手段の操作により前記信号変換手段を介して出力されたものであるか否かを判別することにより前記制御用信号線の短絡を検出し、該短絡検出時には前記開閉制御手段に対し開閉機の駆動を安全に制御させるための短絡検出信号を出力する操作検出手段と、
を具備することを特徴とする。
【０００７】
なお、前記操作検出手段３は前記開閉制御手段と一体で設けられ、いずれもＣＰＵ及びメモリ等のハードウェア構成と、実行プログラムのソフトウェア構成によって作動し、操作検出手段３で短絡が検出されたときには、開閉制御手段による開閉機の駆動制御を安全となる制御が実行される構成とすることもできる。
【０００８】
また、請求項３記載のように、前記信号変換手段７は、制御用信号線６を流れる制御用信号を受けてこれを加工出力する受動体素子で構成することができる。
【０００９】
さらに、請求項４記載のように、前記操作手段２内部に設けられた信号変換手段７の故障短絡時においてもシャッターを安全に制御させるため、前記操作検出手段３は前記操作手段２のうち停止スイッチ５ｃに関しては、制御用信号の加工状態にかかわらず該停止の押動操作に基づき前記開閉制御手段に対して停止の検出信号を出力する構成としてもよい。
【００１０】
また、請求項５記載のように、前記制御用信号線６は、共通ライン６ａおよび開放／閉鎖／停止の各操作スイッチに接続された開放／閉鎖／停止ライン６ｂ〜６ｄの計４本の心線で構成され、
前記制御用信号は所定の交流電圧とされ、
前記信号変換手段７は、制御用信号の一方向に向け接続されたダイオードＤで構成され、
前記操作検出手段３は、開放／閉鎖／停止ライン６ｂ〜６ｄのそれぞれについて並列接続され各々が前記ダイオードＤの接続方向に順接続及び逆接続された一対のフォトカプラＰＣ１，２〜ＰＣ５，６と、
該一対のフォトカプラＰＣ１，２〜ＰＣ５，６の出力の組み合わせに基づき開放／閉鎖／停止の各操作スイッチ５ａ〜５ｃに対応する検出信号を前記開閉制御手段に出力するとともに、前記制御用信号が前記ダイオードＤを介したものであるか否かを判別し短絡判別時には短絡検出信号を前記開閉制御手段に出力する信号判別回路とからなる構成とすることができる。
【００１１】
また、請求項６記載のように、前記制御用信号線６は、共通ライン６ａおよび開放／閉鎖／停止の各操作スイッチ５ａ〜５ｃに接続された開放／閉鎖／停止ライン６ｂ〜６ｄの計４本の心線で構成され、
前記制御用信号は所定の直流電圧とされ、
前記信号変換手段７は、制御用信号の電圧を可変する所定の抵抗値を有する第１の抵抗体Ｒ１で構成され、
前記操作検出手段３は、開放／閉鎖／停止ライン６ｂ〜６ｃのそれぞれについて接続され前記第１の抵抗体Ｒ１と共働して電圧を分圧する第２の抵抗体Ｒ２と、
該第２の抵抗体Ｒ２からそれぞれ並列接続され各々が制御用信号の電流方向に順接続された一対のフォトカプラＰＣ１，２〜ＰＣ５，６と、
うち、一方のフォトカプラＰＣ２，４，６側に直列接続され前記第１，第２の抵抗体Ｒ１による分圧時の電圧では非作動とされ、前記第１の抵抗体Ｒ１を介さない高い電圧によって作動し該一方のフォトカプラＰＣ２，４，６を作動させるためのツェナーダイオードＴＤ１と、
前記一対のフォトカプラＰＣ１，２〜ＰＣ５，６の出力の組み合わせに基づき開放／閉鎖／停止の各操作スイッチ５ａ〜５ｃに対応する検出信号を前記開閉制御手段に出力するとともに、前記制御用信号が前記第１の抵抗体Ｒ１を介したものであるか否かを判別し短絡判別時には短絡検出信号を前記開閉制御手段に出力する信号判別回路とからなる構成とすることもできる。
【００１２】
また、請求項７記載のように、前記操作検出手段３は低電圧作動回路で構成され、前記開閉制御手段２１は高電圧作動回路で構成され、操作検出手段３の出力と開閉制御手段２１の入力段とが電位差を整合する電圧整合回路２２を介して接続された構成とすることができる。
【００１３】
操作手段２は開放／閉鎖／停止の各操作スイッチ５ａ〜５ｃ及び信号変換手段７が設けられ、各操作スイッチ５ａ〜５ｃが押動操作されると、信号変換手段７で信号変換され制御用信号線６ａ〜６ｄを介して操作検出手段３に出力される。
操作検出手段３は、各操作スイッチ５ａ〜５ｃの押動操作を検出して対応する検出信号を開閉制御手段に出力し、開閉機を駆動させシャッターを開放／閉鎖／停止させる。
制御用信号線６ａ〜６ｃ部分で短絡すると、操作検出手段３に対して信号変換手段７を通過しない信号が出力されるため、この状態を判別して短絡検出信号を開閉制御手段に出力する。
開閉制御手段は、短絡検出信号を受けることで開閉機を停止させる等の安全制御を行う。
【００１４】
【発明の実施の形態】
図１は、本発明の電動シャッターの誤動作防止装置の第１の実施形態を示す回路図である。
図示の誤動作防止装置１は、大別して操作手段２と操作検出手段３で構成される。
【００１５】
操作手段２は、シャッターを開放／閉鎖／停止されるための各操作スイッチ５ａ，５ｂ，５ｃを有し接続用制御線６を介して操作検出手段３に接続されている。各操作スイッチ５ａ〜５ｃは常開接点が用いられる。
また、制御用接続線６は、共通ライン６ａ、開放ライン６ｂ、下降ライン６ｃ、停止ライン６ｄの計４本の心線で構成されている。
【００１６】
操作検出手段３は、シャッターを開閉制御する制御手段の一部を構成するものでシャッターケース内に設けられる。この操作検出手段３は、制御用接続線６を介して操作手段２の各操作スイッチ５ａ〜５ｃの操作を検出して対応する検出信号を制御手段に出力し、また、制御用接続線６の短絡検出時に制御手段に対し短絡検出信号を出力する。
制御手段は、ＣＰＵ等のマイコンでシャッターを開閉制御するものであり、検出信号を受けて開閉機に対し同方向に駆動する駆動信号を出力する。また、後述するように短絡検出信号の入力時にはシャッター開閉を安全制御する。
【００１７】
よって、図示されている回路は、制御手段で使用する交流定電圧（低電圧）で作動する。
一方、シャッターを開閉駆動する開閉機は所定の高電圧を駆動電源とするが、制御手段からの制御線を介してこの交流低電圧の駆動信号により回転制御される構成である。
【００１８】
そして、操作手段２内部において制御用接続線６の一部には、図示のような信号変換手段７が設けられる。
この信号変換手段７は、制御用接続線６を流れる制御用信号を受けてこの制御用信号に対し所定の信号変換を行う受動素子で構成されており、操作手段２の小型化に支障無く短絡検知を簡単かつ安価に構成できるようになる。
図示された信号変換手段７としては、流れる交流を半波整流するダイオードＤを用いている。
このダイオードＤは、各操作スイッチ５ａ〜５ｃの近傍の共通ライン６ａ部分に介挿される。
【００１９】
次に、操作検出手段３の内部構成を説明する。開放ライン６ｂには、並列してそれぞれフォトカプラＰＣ１，ＰＣ２が設けられる。
一方のＰＣ１のフォトダイオードｄ１は、ダイオードＤと順方向接続されており、他方、ＰＣ２のフォトダイオードｄ２は、ダイオードＤと逆方向接続されている。
ＰＣ１，２のフォトトランジスタｔｒ１，ｔｒ２は、ｄ１，ｄ２の動作に対応してスイッチング（Ｈ／Ｌ）出力する。
【００２０】
信号判別回路１０は、同ＰＣ１，２のｔｒ１，ｔｒ２の各スイッチング出力が入力されるポート１，２が設けられる。
そしてポート１，２の入力の組み合わせにより開放スイッチ５ａの操作を検出して対応する検出信号を制御手段に出力する。同様にポート１，２の組み合わせにより開放ライン６ｂが他のラインと短絡しているか否かを判別し、短絡判別時には短絡検出信号を制御手段に出力する。
【００２１】
上記同様に、操作検出手段３には、閉鎖ライン６ｃにもそれぞれ同様な構成のＰＣ３，４（ｄ３，ｄ４，ｔｒ３，ｔｒ４）が設けられ、信号判別回路１０のポート３，４の入力の組み合わせで閉鎖スイッチ５ｂの操作を検出して検出信号を出力し、また、閉鎖ライン６ｃが他のラインと短絡しているか否かを判別し、短絡判別時には短絡検出信号を出力する。
【００２２】
上記同様に、操作検出手段３には、停止ライン６ｄにもそれぞれ同様な構成のＰＣ５，６（ｄ５，ｄ６，ｔｒ５，ｔｒ６）が設けられ、信号判別回路１０のポート５，６の入力の組み合わせで停止スイッチ５ｃの操作を検出して検出信号を出力し、また、停止ライン６ｄが他のラインと短絡しているか否かを判別し、短絡判別時には短絡検出信号を出力する。
【００２３】
次に、上記構成による装置の動作を説明する。
操作手段２が何も操作されない状態で信号判別回路１０の各ポートで検出される信号レベルは、ポート１〜６が全てＨとなる。
ここで例えば、開放スイッチ５ａが操作されこの接点が閉じると、共通ライン６ｂ及び開放ライン５ｂ間に制御用信号（電流）が流れるが、ダイオードＤにより半波整流され、ＰＣ１が作動し（ｄ１に電流が流れｔｒ１がＯＮ）ポート１はＬになる。このポート１のＨ→Ｌの変化を受けて信号判別回路１０は、開放スイッチ５ａが操作されたことを検出して制御手段に開放の検出信号を出力する。
このときＰＣ２のｄ２はＤに対し逆方向接続されており、このＰＣ２は動作せずポート２はＨである。
【００２４】
そして、この開放スイッチ５ａが設けられた開放ライン６ｂが他のいずれかのラインと短絡したとき（例えば図示Ａ点の如く共通ライン６ａと短絡）には、開放スイッチ５ａの操作に関係無く、開放ライン６ｂを制御用信号（電流）が流れる。
しかしながら、制御用接続線６の中途位置で短絡したものであり、この制御用信号はダイオードＤを介して流れたものではないから、流れる電流は交流分を全て含む全波交流である。これにより、ＰＣ１、及びＰＣ２のいずれも作動しポート１，２がそれぞれＬになる。
【００２５】
信号判別回路１０はポート１，２がいずれもＬであることに基づき、制御用接続線６が短絡したことを判別し短絡検出信号を出力する。
上記説明では、開放スイッチ５ａの操作の検出及び開放ライン６ｂの短絡判別動作について説明したが、閉鎖スイッチ５ｃ，停止スイッチ５ｃについても同様の処理で操作検出及び短絡判別がなされる。
【００２６】
図２は、上記信号判別回路１０が判別する状態の一覧を示す図である。
信号判別回路１０の各ポート１〜６は、操作スイッチ５ａ〜５ｃを操作しない状態では図示の初期時に示す各信号レベルとなる。
この図に示すように、開放スイッチ５ａについての操作状態及び同開放ライン６ｂの短絡検知についてはポート１，２の組み合わせで判別する。同様に閉鎖スイッチ５ｂと閉鎖ライン６ｃについてはポート３，４の組み合わせで判別する。また、停止スイッチ５ｃと停止ライン６ｄについてはポート５，６の組み合わせで判別する。
【００２７】
そして、制御手段は開放／閉鎖／停止の各の検出信号の入力に基づき開閉機に対し同方向への駆動信号を出力する。この開閉機の駆動によりシャッターは同方向に開放／閉鎖／停止される。
また、制御手段は、短絡検出信号を受けたときには、開閉機に対し駆動信号を出力しない。これにより、制御用接続線６のいずれの心線が他の心線と短絡した場合であっても、開閉機の作動が禁止された停止状態に保持されることになる。これにより、制御用接続線６に短絡事故が発生したことに基づきシャッターが誤って開放／閉鎖動作することが禁止する安全制御がなされることになる。
【００２８】
ところで、制御用接続線６部分での短絡に限らず、信号変換手段７の故障（ダイオードＤの短絡等）の発生も考えられる。
信号変換手段７での故障があると、開閉方向への駆動信号が出力されない点でシャッタの安全制御を行えるが、開閉中に停止スイッチ５ｃが押下されても停止できなくなる問題が生じる。
これに対応するため、信号変換手段７が故障したとき、信号判別回路１０は停止ライン６ｄに関する短絡があった場合には、制御手段に対し検出信号を出力してシャッターを停止させる構成に変更設定しておくこともできる。このとき、短絡検出信号も出力される。
【００２９】
また、前記短絡検出信号は、表示部や、ブザーに出力する構成にでき、短絡状態を画面表示したり報知音を発する構成にできる。
尚、制御手段は、短絡検出信号を受けたときシャッターを停止状態に保持するものの他に、シャッターを同方向に寸同させることを繰り返す等、この短絡状態をシャッター動作が正常時の開閉と異なる状態で開閉される構成として操作者に報知する構成としてもよい。
【００３０】
ところで、図２中のその他（信号出力なし）の部分は、正常時であって開閉操作がなされない初期時、あるいは通常考えられない信号レベルの組み合わせ状態であり、ポート１，２あるいは３，４あるいは５，６がこのその他に相当する組み合わせとなったときにも、制御手段に対し何の信号も出力しないこととする。
【００３１】
尚、停止スイッチ５ｃに常閉接点を用いたときには、ポート５，６に関してのみ他のポート１，２あるいは３、４と反転した状態の信号レベルが検出されることとなる。信号判別回路１０側で他のポートと論理を適合させる入力処理を行ってもよい。ハードウェア回路の構成では入力段に反転素子を設ければよく、ソフト処理であれば、信号の反転処理を行って論理を整合させてもよい。
【００３２】
また、上記構成では、停止ライン６ｄにも２つのＰＣ１４，１５を設ける構成としたが、この停止ライン６ｄには、上記ＰＣ１４，１５に代えて、交流入力のフォトカプラ（２つのフォトダイオードが互いに逆方向で並列接続されたものを用いてもよく、フォトトランジスタの出力が信号判別回路１０のポート５に出力される構成とする。
【００３３】
次に、図３は、本発明の電動シャッターの誤動作防止装置の第２の実施形態を示す回路図である。
同図において、第１実施形態と共通する構成部には同一符号を附して説明を省略している。また、同図では操作検出手段３の内部回路は開放スイッチ（開放ライン６ｂ）に接続された構成のみ記載し、他は同様であり省略している。
【００３４】
そして、図示されている回路は、制御手段で使用する直流定電圧（低電圧）で作動し、開閉機は所定の高電圧を駆動電源としつつ、制御手段からの制御線を介してこの直流低電圧の駆動信号を受けて回転動作する。
【００３５】
操作手段２内部に設けられる信号変換手段７としては、所定の抵抗値を有する（第１の）抵抗体Ｒ１で構成し、制御用接続線６を流れる制御用信号を受けてこの制御用信号の電圧値を可変する。
この抵抗体Ｒ１は、各操作スイッチ５ａ〜５ｃの近傍の共通ライン６ａ部分に介挿される。
ここで、各操作スイッチ５ａ〜５ｃの接点の一端（図示で接点の左側）を１か所にまとめる配線をし、抵抗体Ｒ１の一端をこのまとめた箇所に半田等で直付けすることにより、線路抵抗を低減化でき、分圧時の抵抗値を安定化できる。
【００３６】
操作検出手段３の開放ライン６ｂには、並列して（第２の）抵抗体Ｒ２、フォトカプラＰＣ１，ＰＣ２が設けられる。ＰＣ１，ＰＣ２いずれのフォトダイオードｄ１，ｄ２も電流の順方向に接続されている。
うち、一方のＰＣ２側には、所定のツェナー電圧Ｖｚを有するツェナーダイオードＴＤ１が逆方向接続されている。このツェナー電圧Ｖｚは、前記（第１，第２の）抵抗体Ｒ１，Ｒ２による電圧の分圧値Ｖｒよりも高い電圧値に設定されている。
例えばＲ１，Ｒ２が同じ抵抗値であるとき、このツェナー電圧Ｖｚは供給電圧（制御用信号の電圧）Ｖの１／２よりも高い値（１／２Ｖ＜Ｖｚ＜Ｖ）に設定される。
これにより、正常状態（短絡時以外のとき）においては、ツェナーダイオードＴＤ１によりＰＣ２は動作しない。
【００３７】
信号判別回路１０は、同ＰＣ１，２のｔｒ１，ｔｒ２の入力の組み合わせにより開放スイッチ５ａの操作を検出して検出信号を制御手段に出力し、また、同ポート１，２の組み合わせにより開放ライン６ｂが他のラインと短絡しているか否かを判別し、短絡判別時には短絡検出信号を制御手段に出力する。
【００３８】
不図示であるが、上記同様に、閉鎖ライン６ｃ、停止ライン６ｄにもそれぞれ同様な構成のＴＤ２，ＰＣ３，４と、ＴＤ３，ＰＣ５，６が設けられる。そして、信号判別回路１０はポート３，４の入力の組み合わせで閉鎖スイッチ５ｂ、閉鎖ライン６ｃの状態を検知し、ポート５，６の入力の組み合わせで停止スイッチ５ｃ、停止ライン６ｄの状態を検出して、それぞれ検出信号、短絡検出信号を出力する。
【００３９】
次に、上記構成による装置の動作を説明する。
操作手段２が何も操作されない状態で信号判別回路１０の各ポートで検出される信号レベルは、ポート１〜６が全てＨとなる。
ここで例えば、開放スイッチ５ａが操作されこの接点が閉じると、共通ライン６ｂ及び開放ライン５ｂ間に制御用信号（電流）が流れてＰＣ１が作動し（ｄ１に電流が流れｔｒ１がＯＮ）ポート１はＬになる。このポート１のＨ→Ｌの変化を受けて信号判別回路１０は、開放スイッチ５ａが操作されたことを検出して制御手段に開放の検出信号を出力する。
このときツェナーダイオードＴＤ１に印加される電圧は抵抗体Ｒ１，Ｒ２の分圧値であるため、このツェナーダイオードＴＤ１と直列なＰＣ２（ｄ２）は動作せずポート２はＨである。
【００４０】
そして、この開放スイッチ５ａが設けられた開放ライン６ｂが他のいずれかのラインと短絡したとき（例えば図示Ａ点の如く共通ライン６ａと短絡）には、開放スイッチ５ａの操作に関係無く、開放ライン６ｂを制御用信号（電流）が流れる。
しかしながら、制御用接続線６の中途位置で短絡したものであり、この制御用信号は抵抗体Ｒ１を介して流れたものではないため、供給電圧ＶがツェナーダイオードＴＤ１に直接印加される。
これにより、ツェナー電圧Ｖｚ以上の電圧が印加されてツェナーダイオードＴＤ１を介してＰＣ２（ｄ２）が動作しポート２はＬになる。
このとき、ＰＣ１（ｄ１）も作動しておりポート１もＬである。
【００４１】
信号判別回路１０はポート１，２がいずれもＬであることに基づき、制御用接続線６が短絡したことを判別し制御手段に対し短絡検出信号を出力する。
上記説明では、開放スイッチ５ａの操作の検出及び開放ライン６ｂの短絡判別動作について説明したが、閉鎖スイッチ５ｂ，停止スイッチ５ｃについても同様の処理で操作検出及び短絡判別がなされる。
【００４２】
上記説明ではＲ１を共通ライン６ａ上に設ける構成としたが、これに代えて共通ライン６ａには設けず、開放ライン６ｂ上で開放スイッチ５ａの近傍と、閉鎖ライン６ｃ上で閉鎖スイッチ５ｂの近傍と、停止ライン６ｄ上で停止スイッチ５ｃの近傍と、に夫々設ける構成としてもよい。このとき各抵抗Ｒ１は同一の抵抗値としておく。
【００４３】
次に、本発明の誤動作防止装置の第３の実施形態について図４の回路図を用いて説明する。
この実施の形態では、前記第１の実施の形態で説明した操作手段２と交流定電圧（低電圧）で作動する操作検出手段３と同一構成のものが設けられる。
そして、この操作検出手段３と、交流高電圧（例えば３相２００Ｖ等）で作動する開閉機Ｍを開閉制御する開閉制御手段２１とによりシャッタ開閉を制御する制御盤２０が構成されており、これら操作検出手段３と開閉制御手段２１では電位差の相違があるが、電圧整合部２２を介して互いに接続されている。
尚、操作検出手段３としては、第２の実施の形態で説明した直流定電圧（低電圧）で作動するものを用いる構成としてもよい。
【００４４】
開閉制御手段２１は、電源供給回路と制御回路で構成される。
電源供給回路は、電源ラインと開閉機Ｍとの間に配置され、電源供給を制御して開閉機Ｍを正転／逆転させシャッターを開閉／閉鎖する。図示の３相交流の電源ラインに対し、その各相に開放用と閉鎖用（うち２相を入れ替えた形で接続）のリレー接点を並設し、一方のリレー接点を閉じることにより、開閉機Ｍを正転／逆転させる。
【００４５】
制御回路は、前記操作手段２の各開閉スイッチの操作に対応して電源供給回路のリレー接点を開閉制御し、開閉機Ｍへの電源供給を切り替えてシャッターを開閉停止制御する。
この制御回路は、互いに電源ラインに対し並列接続された開放側回路と閉鎖側回路で構成される。
開放側回路は、開放用トライアックｓｒ１１と、直列な開放用リレー２５を有する。閉鎖側回路は、閉鎖用トライアックｓｒ１０と、直列な閉鎖用リレー２６を有する。
【００４６】
また、常閉接点の停止用トライアックｓｒ１２を介してこれら開放側回路及び閉鎖側回路の開放、閉鎖用の各リレー２５，２６にはそれぞれ並列に、開放用の自己保持用リレー接点２７及び閉鎖用の自己保持用リレー接点２８が接続される。
【００４７】
前記信号判別回路１０は、前述同様に図２に示す判別表の内容で操作スイッチ５ａ〜５ｃの操作状態を判別する。
そして、開放スイッチ５ａの押下時には、ポート１，２入力がそれぞれＬ，Ｈである組み合わせ時にポートＢ，ＣをそれぞれＨに変化させて各スイッチング素子（ｔｒ１１，ｔｒ１２）をオンしＰＣ１１，１２を作動させる。
ＰＣ（フォトカプラ）１１は、低電圧作動のフォトダイオードｄ１１と、高電圧作動の前記開放用トライアックｓｒ１１で構成されており、フォトダイオードｄ１１の発光で開放用トライアックｓｒ１１が導通する。ＰＣ１０，１２も同様にフォトダイオードｄ１０，ｄ１２とトライアックｓｒ１０，１２で構成される。
このように、各ＰＣ１０，１１，１２によって、両側の回路での電圧の相違を整合させる電圧整合回路２２が形成されており、汎用の開閉制御手段２１に対し前述の操作検出手段３を追加する構成とすることができるようになる。
【００４８】
また、閉鎖スイッチ５ｂの押下時には、ポート３，４がそれぞれＬ，Ｈである組み合わせ時にポートＡ，ＣをＨに変化させてｔｒ１０，ｔｒ１２をオンしＰＣ１０，１２を作動させる。
また、停止スイッチ５ｃの押下時には、ポート５，６の入力判断で、少なくともポートＣをＬに変化させてｔｒ１２をオフさせＰＣ１２を非作動にする。
【００４９】
また、信号判別回路１０は、開放ライン６ｂの短絡検知時はポート１，２の組み合わせがＬ，Ｌのとき少なくともポートＣをＬに変化させてｔｒ１２をオフさせＰＣ１２を非作動とする。
同様に、閉鎖ライン６ｃ，停止ライン６ｄの短絡検知は、ポート３，４、ポート５，６の組み合わせがＬ，Ｌであるとき、少なくともポートＣをＬに変化させてｔｒ１２をオフさせＰＣ１２を非作動とする。
尚、信号判別回路のポートＡ〜Ｃの出力側を図示のように、フォトダイオードｄ１０〜ｄ１２とトランジスタｔｒ１０〜１３で構成したときには、該回路部分を直流低電圧回路で構成する。
【００５０】
上記構成によれば、開放スイッチ５ａが押下されると、信号判別回路１０はこれを判断してポートＢ，ＣをＨにし、ＰＣ１１，１２が作動して開放側回路が導通し、開放用リレー２５が通電され、開閉機Ｍに対して開放用の電源が供給される。
以降は、開放スイッチ５ａが離されても自己保持用リレー接点２７を介して開放用リレー２５が継続して通電され、開閉機Ｍが連続して駆動しシャッターが開放されるようになっている。
【００５１】
シャッターが上限位置に達すると、開放側回路の開放用リレー２５に直列な上限用リミットスイッチＬＳが開き、開放用リレー２５が非通電状態となり開閉機Ｍは停止する。
また、開放動作中に停止スイッチ５ｃが押下されたときには、信号判別回路１０は少なくともポートＣをＬにすることにより、ＰＣ１２が非作動となり開放用リレー２５が非通電状態となり開閉機Ｍは停止する。
【００５２】
シャッター閉鎖の動作は、上記開放の動作とほぼ同様に、閉鎖スイッチ５ｂの押下に基づき信号判別回路１０はポートＡ，ＣをＨにし、ＰＣ１０，１２が作動して閉鎖側回路が導通し、閉鎖用リレー２６が通電後、自己保持用リレー接点２８でこれが自己保持され、下限用リミットスイッチＬＳが開くまで連続して下降する。
また、閉鎖動作中に停止スイッチ５ｃが押下されたときには、信号判別回路１０は少なくともポートＣをＬにすることにより、ＰＣ１２が非作動となり閉鎖用リレー２６が非通電状態となり開閉機Ｍは停止する。
【００５３】
次に、いずれかのライン６ａ〜６ｄ間での短絡があった場合、信号判別回路は各ラインの入力ポート１，２、あるいは３，４、または５，６の組み合わせがいずれもＬ，Ｌであること（図２参照）で短絡を検知する。
この検知時には、少なくともポートＣをＬにする制御を行う。これにより、ＰＣ１２が非作動となり通電中であった開放用リレー２５、あるいは閉鎖用リレー２６はいずれであっても非通電状態となり開閉機Ｍは停止制御される。
【００５４】
上記信号判別回路１０は、入力ポート１と２、３と４、５と６の状態によって出力ポートＡ，Ｂ，Ｃの出力を切り替える構成であればよく、簡単なロジック回路で構成することができる。
【００５５】
【発明の効果】
本発明によれば、開閉制御手段から離れて配置される操作手段との間に設けられた制御用信号線が短絡したときに、これを検出することができ短絡してもシャッターが誤動作することがない。これにより、シャッターをより安全に開閉できるようになる。
また、操作検出手段は、前記制御信号線の短絡検出に加え前記開閉スイッチの操作検出を行う構成にでき、開閉制御手段の前段にて操作信号系統の状態を監視できるようになる。
例えば、制御手段が、短絡検出信号を受けたときに、開閉機に対し駆動信号を出力しないこととすれば、制御用信号線が短絡した場合、開閉機の作動が禁止された停止状態に保持することができ、これにより、制御用信号線に短絡事故が発生したことに基づきシャッターが誤って開放／閉鎖動作することが禁止する安全制御がなされることになる。
なお、信号変換手段は操作手段に設けられた受動素子で構成して、制御用信号線の信号に対し加工を施す構成とすれば、操作手段の小型化に支障が無く短絡検知を簡単かつ安価に構成できる。また、これら操作検出手段と開閉制御手段は、単一のＣＰＵを用いたソフト制御で実行することもできる。
対して、操作検出手段は交流あるいは直流の低電圧回路等、受動素子の加工信号を判別できる任意の構成に変更でき装置設計が容易に行える。
加えて、開閉制御手段側が交流高電圧回路であっても電圧整合回路を設けた構成によって操作検出手段と接続できるようになる。これにより、例えば汎用されている交流高電圧で動作する開閉機の開閉制御手段に、前記操作手段の短絡検知を行う操作検出手段を容易に機能追加できる。
【図面の簡単な説明】
【図１】本発明の電動シャッターの誤動作防止装置の第１の実施形態を示す回路図。
【図２】同装置が検出する各種状態を示す状態図。
【図３】本発明の装置の第２の実施形態を示す回路図。
【図４】本発明の装置の第３の実施形態を示す回路図。
【符号の説明】
１…誤操作防止装置、２…操作手段、３…操作検出手段、５ａ…開放スイッチ、５ｂ…閉鎖スイッチ、５ｃ…停止スイッチ、６…制御用接続線、６ａ…共通ライン、６ｂ…開放ライン、６ｃ…閉鎖ライン、６ｄ…停止ライン、７…信号変換手段、１０…信号判別回路、２０…制御盤、２１…開閉制御手段、２５…開放用リレー、２６…閉鎖用リレー、ＰＣ１〜ＰＣ６，ＰＣ１０〜１２…フォトカプラ、ｄ１〜ｄ６，ｄ１０〜ｄ１２…フォトダイオード、ｔｒ１〜ｔｒ６…フォトトランジスタ、ｓｒ１０〜ｓｒ１２…トライアック、Ｄ１…ダイオード、ＴＤ１〜ＴＤ３…ツェナーダイオード、Ｒ１，Ｒ２…第１，第２の抵抗体。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric shutter malfunction prevention device that prevents malfunction of an electric shutter due to a damage short circuit of a control connection line that is provided in the electric shutter and controls opening and closing.
[0002]
[Prior art]
A control device that controls opening and closing of an electric shutter is often installed in a shutter case provided with a shutter winding unit.
For this reason, it is installed at a position away from the operation unit for opening / closing operation, the interlocking operation means with other devices, and the like. For this reason, the control device and the operation unit are connected by a control connection line such as an electric wire.
[0003]
[Problems to be solved by the invention]
This control connection line is wired along the wall of the building or inside the building, so it may be damaged accidentally during construction, or it may be subjected to pressure or nailing from other building components in later construction. There is a risk that the core wire of the control connection wire may be damaged.
In addition, it is conceivable that the control connection wire becomes hot due to a flame or heat at the time of a disaster, the electric wire melts and the core wire melts (short-circuits).
If these control connection lines are short-circuited, the control device may determine that the opening / closing operation has been performed even if the operation unit is not operated, which may cause an accident or cause a problem in crime prevention.
[0004]
The present invention has been made in view of the above circumstances, and it is possible to prevent the shutter from malfunctioning even if the control connection line is short-circuited by identifying whether or not the operation unit is operated. Therefore, an object of the present invention is to provide an electric shutter malfunction prevention device that can more safely open and close the shutter.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an apparatus for preventing malfunction of an electric shutter according to the present invention includes an opening / closing control means for driving the opening / closing device to open / close the shutter and an operation switch for opening / closing the electric shutter. An electric shutter in which the opening / closing control means and the operation means 2 are connected via a control signal line 6.
Signal converting means 7 that is inserted into the control signal line 6 in the vicinity of the operation switch of the operating means 2 and processes and outputs a control signal flowing through the control signal line 6;
Based on the contents of the control signal provided in the opening / closing control means, it is determined whether or not the control signal is processed by the signal conversion means 7 via the operation means 2, and the operation switch is operated. When a state and a short circuit of the control signal line 6 are detected and it is detected that the operation switch is operated, a detection signal corresponding to the operation of the operation switch is output to the open / close control means, and the control signal line 6 Operation detecting means 3 for outputting a short-circuit detection signal for safely controlling the driving of the opening / closing device to the opening / closing control means at the time of detecting a short circuit,
It is characterized by comprising.
[0006]
Further, as described in claim 2, an opening / closing control means provided in the vicinity of an opening / closing device that operates at a predetermined voltage, and outputs a drive signal to the opening / closing device to open / close / stop the shutter;
Arranged at operation locations away from the opening / closing control means, each operation switch for opening / closing / stopping the shutter is provided, and a control signal is output via a control signal line corresponding to each operation switch. Operating means to
Provided inside the operation means, inserted into the control signal line in the vicinity of the operation switch of the operation means, processes the control signal flowing through the control signal line, and outputs it to the open / close control means Signal conversion means;
A detection signal provided at an input stage of the opening / closing control means and corresponding to the operation of each operation switch for opening / closing / stopping the operating means based on the control signal is output to the opening / closing control means. A short circuit of the control signal line is detected by determining whether or not the signal is output through the signal conversion means by operation of the means, and when the short circuit is detected, the opening / closing control means is driven by the opening / closing control means. Operation detecting means for outputting a short-circuit detection signal for safely controlling
It is characterized by comprising.
[0007]
The operation detection means 3 is provided integrally with the opening / closing control means, and both are operated by a hardware configuration such as a CPU and a memory and a software configuration of an execution program, and when the operation detection means 3 detects a short circuit. In addition, it is possible to adopt a configuration in which the driving control of the opening / closing device by the opening / closing control means is executed as a safe control.
[0008]
According to a third aspect of the present invention, the signal converting means 7 can be composed of a passive element that receives a control signal flowing through the control signal line 6 and processes and outputs it.
[0009]
Further, as described in claim 4, the operation detection means 3 is stopped among the operation means 2 in order to control the shutter safely even when the signal conversion means 7 provided in the operation means 2 is short-circuited. The switch 5c may be configured to output a stop detection signal to the open / close control means based on the stop pushing operation regardless of the processing state of the control signal.
[0010]
In addition, as described in claim 5, the control signal line 6 has a total of four cores including a common line 6a and open / close / stop lines 6b to 6d connected to the open / close / stop operation switches. Composed of lines,
The control signal is a predetermined AC voltage,
The signal converting means 7 is composed of a diode D connected to one direction of the control signal,
The operation detection means 3 includes a pair of photocouplers PC1, PC2 to PC5, 6 connected in parallel with respect to each of the open / close / stop lines 6b to 6d and each connected in the forward and reverse directions in the connection direction of the diode D. ,
Based on a combination of outputs of the pair of photocouplers PC1, PC2 to PC5, 6, detection signals corresponding to the open / close / stop operation switches 5a to 5c are output to the open / close control means, and the control signal is It can be configured to include a signal discrimination circuit that discriminates whether or not it is via the diode D and outputs a short-circuit detection signal to the open / close control means at the time of short-circuit discrimination.
[0011]
According to a sixth aspect of the present invention, the control signal line 6 includes a common line 6a and open / close / stop lines 6b-6d connected to the open / close / stop operation switches 5a-5c. Consists of book cores,
The control signal is a predetermined DC voltage,
The signal conversion means 7 includes a first resistor R1 having a predetermined resistance value that varies the voltage of the control signal.
The operation detecting means 3 is connected to each of the open / close / stop lines 6b to 6c, and a second resistor R2 that cooperates with the first resistor R1 to divide the voltage,
A pair of photocouplers PC1, PC2 to PC5, 6 connected in parallel from the second resistor R2 and connected in the current direction of the control signal, respectively,
Of these, a high voltage that is connected in series to one of the photocouplers PC2, 4, 6 and is inoperative with no voltage at the time of voltage division by the first and second resistors R1, and does not pass through the first resistor R1. A zener diode TD1 for actuating the one of the photocouplers PC2, 4, 6;
Based on the combination of outputs of the pair of photocouplers PC1, PC2 to PC5, 6, detection signals corresponding to the open / close / stop operation switches 5a to 5c are output to the open / close control means, and the control signal is It may be configured by a signal discrimination circuit that discriminates whether or not it is via the first resistor R1 and outputs a short-circuit detection signal to the open / close control means at the time of short-circuit discrimination.
[0012]
According to a seventh aspect of the present invention, the operation detecting means 3 is composed of a low voltage operating circuit, the opening / closing control means 21 is composed of a high voltage operating circuit, and the output of the operation detecting means 3 and the opening / closing control means 21 The input stage may be connected via a voltage matching circuit 22 that matches the potential difference.
[0013]
The operation means 2 is provided with open / close / stop operation switches 5a to 5c and a signal conversion means 7, and when each of the operation switches 5a to 5c is pushed, the signal conversion means 7 converts the signal to a control signal. It is output to the operation detecting means 3 via the lines 6a to 6d.
The operation detecting means 3 detects the pushing operation of each of the operation switches 5a to 5c and outputs a corresponding detection signal to the opening / closing control means to drive the opening / closing machine to open / close / stop the shutter.
When the control signal lines 6a to 6c are short-circuited, a signal that does not pass through the signal conversion means 7 is output to the operation detection means 3, so this state is determined and a short-circuit detection signal is output to the open / close control means.
The open / close control means performs safety control such as stopping the switch by receiving a short circuit detection signal.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a circuit diagram showing a first embodiment of the electric shutter malfunction prevention apparatus of the present invention.
The illustrated malfunction prevention device 1 is roughly composed of an operation means 2 and an operation detection means 3.
[0015]
The operation means 2 has operation switches 5 a, 5 b, 5 c for opening / closing / stopping the shutter, and is connected to the operation detection means 3 via the connection control line 6. Each operation switch 5a-5c uses a normally open contact.
The control connection line 6 is composed of a total of four core wires, that is, a common line 6a, an open line 6b, a descending line 6c, and a stop line 6d.
[0016]
The operation detection means 3 constitutes a part of control means for controlling opening / closing of the shutter, and is provided in the shutter case. This operation detection means 3 detects the operation of each operation switch 5a-5c of the operation means 2 via the control connection line 6 and outputs a corresponding detection signal to the control means. When a short circuit is detected, a short circuit detection signal is output to the control means.
The control means controls the opening and closing of the shutter by a microcomputer such as a CPU, and receives a detection signal and outputs a drive signal for driving the switch in the same direction. Further, as will be described later, when the short circuit detection signal is input, the shutter opening / closing is safely controlled.
[0017]
Thus, the illustrated circuit operates with an alternating constant voltage (low voltage) used by the control means.
On the other hand, an open / close device that opens and closes the shutter uses a predetermined high voltage as a drive power supply, and is configured to be rotationally controlled by this AC low voltage drive signal via a control line from the control means.
[0018]
A signal conversion means 7 as shown in the figure is provided in a part of the control connection line 6 inside the operation means 2.
The signal conversion means 7 is composed of a passive element that receives a control signal flowing through the control connection line 6 and performs predetermined signal conversion on the control signal, and short-circuits the operation means 2 without any trouble. Detection can be configured easily and inexpensively.
As the signal conversion means 7 shown in the figure, a diode D for half-wave rectifying the flowing alternating current is used.
This diode D is inserted in the common line 6a part in the vicinity of each operation switch 5a-5c.
[0019]
Next, the internal configuration of the operation detection unit 3 will be described. Photocouplers PC1 and PC2 are provided in parallel on the open line 6b, respectively.
The photodiode d1 of one PC1 is forward-connected to the diode D, and the photodiode d2 of PC2 is connected to the diode D in the reverse direction.
The phototransistors tr1 and tr2 of PC1 and PC2 perform switching (H / L) output corresponding to the operations of d1 and d2.
[0020]
The signal discriminating circuit 10 is provided with ports 1 and 2 to which the switching outputs tr1 and tr2 of the PCs 1 and 2 are input.
Then, the operation of the open switch 5a is detected by the combination of the inputs of the ports 1 and 2, and a corresponding detection signal is output to the control means. Similarly, it is determined whether or not the open line 6b is short-circuited with other lines by the combination of the ports 1 and 2, and a short-circuit detection signal is output to the control means at the time of short-circuit determination.
[0021]
Similarly to the above, the operation detection means 3 is also provided with PCs 3 and 4 (d3, d4, tr3 and tr4) having the same configuration in the closed line 6c, respectively, and a combination of inputs of the ports 3 and 4 of the signal discrimination circuit 10 Then, the operation of the closing switch 5b is detected and a detection signal is output, and it is determined whether or not the closing line 6c is short-circuited with other lines, and a short-circuit detection signal is output when a short-circuit is determined.
[0022]
Similarly to the above, the operation detection means 3 is also provided with PCs 5 and 6 (d5, d6, tr5 and tr6) having the same configuration in the stop line 6d, respectively, and a combination of inputs of ports 5 and 6 of the signal discrimination circuit 10 Then, the operation of the stop switch 5c is detected and a detection signal is output, and it is determined whether or not the stop line 6d is short-circuited with other lines, and a short-circuit detection signal is output at the time of short-circuit determination.
[0023]
Next, the operation of the apparatus having the above configuration will be described.
The signal level detected at each port of the signal discriminating circuit 10 in a state in which nothing is operated on the operation means 2 is H for all ports 1 to 6.
Here, for example, when the open switch 5a is operated and this contact is closed, a control signal (current) flows between the common line 6b and the open line 5b, but half-wave rectification is performed by the diode D, and the PC1 is activated (to d1). Current flows and tr1 is ON) Port 1 becomes L. In response to the change of H → L of the port 1, the signal determination circuit 10 detects that the open switch 5a has been operated and outputs an open detection signal to the control means.
At this time, d2 of PC2 is reversely connected to D, and this PC2 does not operate and port 2 is H.
[0024]
When the open line 6b provided with the open switch 5a is short-circuited with any other line (for example, short-circuited with the common line 6a as shown in the point A in the figure), the open line 6b is opened regardless of the operation of the open switch 5a. A control signal (current) flows through the line 6b.
However, since the control connection line 6 is short-circuited at an intermediate position and the control signal does not flow through the diode D, the flowing current is a full-wave alternating current including all alternating current. As a result, both PC1 and PC2 operate and ports 1 and 2 are set to L, respectively.
[0025]
Based on the fact that the ports 1 and 2 are both L, the signal discrimination circuit 10 discriminates that the control connection line 6 is short-circuited and outputs a short-circuit detection signal.
In the above description, the detection of the operation of the open switch 5a and the short circuit determination operation of the open line 6b have been described. However, the operation detection and the short circuit determination are also performed for the close switch 5c and the stop switch 5c by the same processing.
[0026]
FIG. 2 is a diagram showing a list of states determined by the signal determination circuit 10.
The ports 1 to 6 of the signal discrimination circuit 10 have signal levels shown at the initial stage in the figure when the operation switches 5a to 5c are not operated.
As shown in this figure, the operation state of the open switch 5a and the short circuit detection of the open line 6b are determined by the combination of the ports 1 and 2. Similarly, the closing switch 5b and the closing line 6c are determined by the combination of the ports 3 and 4. Further, the stop switch 5c and the stop line 6d are determined by the combination of the ports 5 and 6.
[0027]
And a control means outputs the drive signal to the same direction with respect to a switch based on the input of each detection signal of open / close / stop. By driving the switch, the shutter is opened / closed / stopped in the same direction.
Further, when receiving the short circuit detection signal, the control means does not output a drive signal to the switch. Thereby, even if any of the core wires of the control connection line 6 is short-circuited with the other core wires, the switch is kept in a stopped state in which the operation of the switch is prohibited. As a result, safety control is performed that prohibits the shutter from being erroneously opened / closed based on the occurrence of a short circuit accident in the control connection line 6.
[0028]
By the way, not only the short circuit at the control connection line 6 but also the failure of the signal conversion means 7 (short circuit of the diode D, etc.) can be considered.
If there is a failure in the signal conversion means 7, safety control of the shutter can be performed in that a drive signal in the opening / closing direction is not output, but there is a problem that the shutter cannot be stopped even if the stop switch 5c is pressed during opening / closing.
To cope with this, when the signal conversion means 7 fails, the signal determination circuit 10 changes the setting to stop the shutter by outputting a detection signal to the control means if there is a short circuit related to the stop line 6d. You can also keep it. At this time, a short circuit detection signal is also output.
[0029]
The short circuit detection signal can be output to a display unit or a buzzer, and the short circuit state can be displayed on the screen or a notification sound can be generated.
In addition to the one that keeps the shutter in the stopped state when receiving the short circuit detection signal, the control means repeats the same shutter in the same direction, and this short circuit state differs from opening and closing when the shutter operation is normal. It is good also as a structure which alert | reports to an operator as a structure opened and closed in a state.
[0030]
By the way, the other part (no signal output) in FIG. 2 is a normal state and an initial state when the opening / closing operation is not performed, or a combination state of signal levels which cannot be normally considered. Alternatively, no signal is output to the control means even when 5 and 6 are combinations corresponding to the other.
[0031]
When a normally closed contact is used for the stop switch 5c, only the signal level of the ports 5 and 6 is detected that is inverted with respect to the other ports 1, 2, or 3, 4. Input processing for matching logic with other ports may be performed on the signal discrimination circuit 10 side. In the configuration of the hardware circuit, an inverting element may be provided in the input stage, and in the case of software processing, logic inversion may be performed by performing signal inversion processing.
[0032]
In the above configuration, the stop line 6d is also provided with two PCs 14 and 15. However, instead of the PCs 14 and 15, the stop line 6d has an AC input photocoupler (two photodiodes connected to each other). Those connected in parallel in the opposite direction may be used, and the output of the phototransistor is output to the port 5 of the signal discrimination circuit 10.
[0033]
FIG. 3 is a circuit diagram showing a second embodiment of the electric shutter malfunction prevention apparatus of the present invention.
In the figure, the same reference numerals are assigned to components common to the first embodiment, and description thereof is omitted. In the figure, only the configuration in which the internal circuit of the operation detection means 3 is connected to the open switch (open line 6b) is shown, and the other is the same and is omitted.
[0034]
The circuit shown in the figure operates at a DC constant voltage (low voltage) used by the control means, and the switch operates with a predetermined high voltage as a drive power supply, while this DC low voltage is supplied via a control line from the control means. Receiving a voltage drive signal, it rotates.
[0035]
The signal conversion means 7 provided in the operation means 2 is composed of a (first) resistor R1 having a predetermined resistance value, receives a control signal flowing through the control connection line 6, and receives this control signal. Variable voltage value.
The resistor R1 is inserted in the common line 6a portion in the vicinity of the operation switches 5a to 5c.
Here, by wiring one end of the contact of each operation switch 5a to 5c (the left side of the contact in the figure) in one place, and directly attaching one end of the resistor R1 to the gathered place with solder or the like, The line resistance can be reduced, and the resistance value during voltage division can be stabilized.
[0036]
The open line 6b of the operation detection means 3 is provided with a (second) resistor R2 and photocouplers PC1 and PC2 in parallel. The photodiodes d1 and d2 of both PC1 and PC2 are connected in the forward direction of current.
Among them, a Zener diode TD1 having a predetermined Zener voltage Vz is reversely connected to one PC2 side. The Zener voltage Vz is set to a voltage value higher than the voltage divided value Vr by the (first and second) resistors R1 and R2.
For example, when R1 and R2 have the same resistance value, the Zener voltage Vz is set to a value (1 / 2V <Vz <V) higher than ½ of the supply voltage (control signal voltage) V.
Thus, in a normal state (when not short-circuited), the PC 2 does not operate due to the Zener diode TD1.
[0037]
The signal discriminating circuit 10 detects the operation of the open switch 5a by the combination of the inputs tr1 and tr2 of the PCs 1 and 2 and outputs a detection signal to the control means. Is short-circuited with other lines, and a short-circuit detection signal is output to the control means at the time of short-circuit determination.
[0038]
Although not shown, similarly to the above, the closing line 6c and the stop line 6d are also provided with TD2, PC3, 4 and TD3, PC5, 6 having the same configuration, respectively. The signal discriminating circuit 10 detects the state of the closing switch 5b and the closing line 6c by the combination of the inputs of the ports 3 and 4, and detects the state of the stopping switch 5c and the stopping line 6d by the combination of the inputs of the ports 5 and 6. Output a detection signal and a short-circuit detection signal, respectively.
[0039]
Next, the operation of the apparatus having the above configuration will be described.
The signal level detected at each port of the signal discriminating circuit 10 in a state in which nothing is operated on the operation means 2 is H for all ports 1 to 6.
Here, for example, when the open switch 5a is operated and this contact is closed, a control signal (current) flows between the common line 6b and the open line 5b, and PC1 is activated (current flows through d1 and tr1 is ON). Becomes L. In response to the change of H → L of the port 1, the signal determination circuit 10 detects that the open switch 5a has been operated and outputs an open detection signal to the control means.
At this time, since the voltage applied to the Zener diode TD1 is a divided value of the resistors R1 and R2, PC2 (d2) in series with the Zener diode TD1 does not operate and the port 2 is H.
[0040]
When the open line 6b provided with the open switch 5a is short-circuited with any other line (for example, short-circuited with the common line 6a as shown in the point A in the figure), the open line 6b is opened regardless of the operation of the open switch 5a. A control signal (current) flows through the line 6b.
However, since the control connection line 6 is short-circuited at an intermediate position and the control signal does not flow through the resistor R1, the supply voltage V is directly applied to the Zener diode TD1.
As a result, a voltage equal to or higher than the zener voltage Vz is applied, the PC2 (d2) is operated via the zener diode TD1, and the port 2 becomes L.
At this time, PC1 (d1) is also operating and port 1 is also L.
[0041]
Based on the fact that the ports 1 and 2 are both L, the signal discrimination circuit 10 discriminates that the control connection line 6 is short-circuited and outputs a short-circuit detection signal to the control means.
In the above description, the detection of the operation of the open switch 5a and the short-circuit determination operation of the open line 6b have been described. However, the operation detection and the short-circuit determination are also performed for the close switch 5b and the stop switch 5c by the same processing.
[0042]
In the above description, R1 is provided on the common line 6a. Instead, it is not provided on the common line 6a. Instead, it is provided near the open switch 5a on the open line 6b and near the close switch 5b on the close line 6c. In addition, it may be configured to be provided in the vicinity of the stop switch 5c on the stop line 6d. At this time, the resistors R1 have the same resistance value.
[0043]
Next, a third embodiment of the malfunction prevention device of the present invention will be described with reference to the circuit diagram of FIG.
In this embodiment, there is provided the same configuration as the operation means 2 described in the first embodiment and the operation detection means 3 that operates at an AC constant voltage (low voltage).
A control panel 20 that controls the opening and closing of the shutter is configured by the operation detecting means 3 and the opening and closing control means 21 that controls the opening and closing of the opening and closing machine M that operates with an alternating high voltage (for example, three-phase 200 V). The operation detection unit 3 and the open / close control unit 21 are connected to each other through a voltage matching unit 22 although there is a difference in potential difference.
The operation detecting means 3 may be configured to use one that operates at the constant DC voltage (low voltage) described in the second embodiment.
[0044]
The open / close control means 21 includes a power supply circuit and a control circuit.
The power supply circuit is disposed between the power line and the switch M, and controls the power supply to rotate the switch M forward / reversely to open / close / close the shutter. Opening and closing relay contacts are connected to each of the three-phase AC power supply lines shown in the figure (of which two phases are interchanged), and one of the relay contacts is closed to open the switch M is rotated forward / reversely.
[0045]
The control circuit controls the opening and closing of the relay contacts of the power supply circuit in response to the operation of each open / close switch of the operating means 2, and switches the power supply to the switch M to control the opening / closing of the shutter.
This control circuit is composed of an open circuit and a closed circuit that are connected in parallel to the power supply line.
The open circuit includes an open triac sr11 and a series open relay 25. The closing side circuit has a closing triac sr10 and a series closing relay 26.
[0046]
Further, via the triac sr12 for stopping the normally closed contact, the open and closed relays 25 and 26 of the open side circuit and the close side circuit are connected in parallel to the open self-holding relay contact 27 and the close contact relay, respectively. The self-holding relay contact 28 is connected.
[0047]
The signal discriminating circuit 10 discriminates the operation state of the operation switches 5a to 5c based on the contents of the discrimination table shown in FIG.
When the release switch 5a is pressed, the ports B and C are changed to H when the inputs of the ports 1 and 2 are L and H, respectively, and the switching elements (tr11 and tr12) are turned on to activate the PCs 11 and 12. Let
The PC (photocoupler) 11 includes a low-voltage operated photodiode d11 and a high-voltage operated open triac sr11, and the open triac sr11 is turned on by light emission of the photodiode d11. Similarly, the PCs 10 and 12 include photodiodes d10 and d12 and triacs sr10 and 12, respectively.
In this way, the voltage matching circuit 22 for matching the voltage difference between the circuits on both sides is formed by the PCs 10, 11, and 12, and the aforementioned operation detection means 3 is added to the general-purpose switching control means 21. Can be configured.
[0048]
When the closing switch 5b is pressed, when the ports 3 and 4 are L and H, respectively, the ports A and C are changed to H to turn on the tr10 and tr12 to operate the PCs 10 and 12.
Further, when the stop switch 5c is pressed, at the input judgment of the ports 5 and 6, at least the port C is changed to L, tr12 is turned off, and the PC 12 is deactivated.
[0049]
In addition, when the short circuit of the open line 6b is detected, the signal determination circuit 10 changes at least the port C to L when the combination of the ports 1 and 2 is L and L to turn off the tr12 and deactivate the PC12.
Similarly, when the combination of the ports 3 and 4 and the ports 5 and 6 is L and L, the short circuit detection of the closed line 6c and the stop line 6d is performed by changing at least the port C to L and turning off the tr12. Operate.
When the output sides of the ports A to C of the signal discrimination circuit are configured with photodiodes d10 to d12 and transistors tr10 to 13 as shown in the figure, the circuit portion is configured with a DC low voltage circuit.
[0050]
According to the above configuration, when the release switch 5a is pressed, the signal discriminating circuit 10 judges this and sets the ports B and C to H, the PCs 11 and 12 are activated, the open circuit is conducted, and the open relay No. 25 is energized, and an opening power is supplied to the switch M.
Thereafter, even when the release switch 5a is released, the release relay 25 is continuously energized via the self-holding relay contact 27, and the switch M is continuously driven to open the shutter. .
[0051]
When the shutter reaches the upper limit position, the upper limit switch LS in series with the open relay 25 of the open circuit is opened, the open relay 25 is deenergized, and the switch M is stopped.
When the stop switch 5c is pressed during the opening operation, the signal determination circuit 10 sets at least the port C to L so that the PC 12 is not operated and the opening relay 25 is not energized and the switch M is stopped. .
[0052]
In the shutter closing operation, in the same manner as the above opening operation, the signal discrimination circuit 10 sets the ports A and C to H based on the depression of the closing switch 5b, the PCs 10 and 12 are activated and the closing circuit is turned on, and the closing operation is performed. After the relay 26 is energized, it is self-held by the self-holding relay contact 28 and is continuously lowered until the lower limit switch LS is opened.
When the stop switch 5c is pressed during the closing operation, the signal discrimination circuit 10 sets at least the port C to L so that the PC 12 is inoperative, the closing relay 26 is in a non-energized state, and the switch M is stopped. .
[0053]
Next, when there is a short circuit between any of the lines 6a to 6d, the signal discriminating circuit is L, L for any combination of the input ports 1, 2, 3, 4, or 5, 6 of each line. A short circuit is detected by being present (see FIG. 2).
At the time of this detection, control is performed to at least set the port C to L. As a result, the opening relay 25 or the closing relay 26 that has been energized because the PC 12 is inactive is in a non-energized state, and the switch M is controlled to stop.
[0054]
The signal discriminating circuit 10 only needs to be configured to switch the output of the output ports A, B, and C depending on the states of the input ports 1, 2, 3, 4, 5, and 6, and can be configured with a simple logic circuit. .
[0055]
【The invention's effect】
According to the present invention, when the control signal line provided between the operating means arranged away from the opening / closing control means is short-circuited, this can be detected, and the shutter malfunctions even if short-circuited. There is no. As a result, the shutter can be opened and closed more safely.
Further, the operation detection means can be configured to detect the operation of the open / close switch in addition to the detection of the short-circuit of the control signal line, and the state of the operation signal system can be monitored in the preceding stage of the open / close control means.
For example, if the control means does not output a drive signal to the switch when it receives a short circuit detection signal, if the control signal line is short-circuited, the switch is kept in a stopped state in which operation of the switch is prohibited. Thus, safety control is performed to prohibit the shutter from being erroneously opened / closed based on the occurrence of a short circuit accident in the control signal line.
If the signal conversion means is composed of passive elements provided in the operation means, and processing is performed on the signal of the control signal line, there is no hindrance to downsizing of the operation means, and short circuit detection is simple and inexpensive. Can be configured. Further, these operation detection means and opening / closing control means can be executed by software control using a single CPU.
On the other hand, the operation detection means can be changed to an arbitrary configuration capable of discriminating the machining signal of the passive element such as an AC or DC low voltage circuit, and the device design can be easily performed.
In addition, even if the open / close control means side is an AC high voltage circuit, it can be connected to the operation detection means by the configuration provided with the voltage matching circuit. As a result, for example, an operation detection means for detecting a short circuit of the operation means can be easily added to the open / close control means of the switch that operates at a general AC high voltage.
[Brief description of the drawings]
FIG. 1 is a circuit diagram illustrating a first embodiment of a malfunction prevention device for an electric shutter according to the present invention.
FIG. 2 is a state diagram showing various states detected by the apparatus.
FIG. 3 is a circuit diagram showing a second embodiment of the apparatus of the present invention.
FIG. 4 is a circuit diagram showing a third embodiment of the apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Misoperation prevention apparatus, 2 ... Operation means, 3 ... Operation detection means, 5a ... Open switch, 5b ... Close switch, 5c ... Stop switch, 6 ... Control connection line, 6a ... Common line, 6b ... Open line, 6c DESCRIPTION OF SYMBOLS ... Close line, 6d ... Stop line, 7 ... Signal conversion means, 10 ... Signal discrimination circuit, 20 ... Control panel, 21 ... Opening / closing control means, 25 ... Opening relay, 26 ... Closing relay, PC1-PC6, PC10 12 ... Photocoupler, d1 to d6, d10 to d12 ... Photodiode, tr1 to tr6 ... Phototransistor, sr10 to sr12 ... Triac, D1 ... Diode, TD1 to TD3 ... Zener diode, R1, R2 ... First and second Resistor.

Claims

The opening / closing control means for opening / closing the shutter by driving the opening / closing machine and the operation means having an operation switch for opening / closing the electric shutter are installed at positions separated from each other, and the opening / closing control means and the operation means are control signals. An electric shutter connected via a wire ,
Wherein interposed in said control signal line in the vicinity of the operation switch of the operation unit, a signal conversion means for outputting the processed control signals flowing through the control signal line,
Provided in the switching control hand stage, based on the content of the control signal, to determine whether those該制patronage signal is processed by the signal conversion means through said operating means, operation state of the operation switch And detecting a short circuit of the control signal line, and detecting that the operation switch is operated, outputs a detection signal corresponding to the operation of the operation switch to the open / close control means to detect a short circuit of the control signal line. Operation detection means for outputting a short-circuit detection signal for causing the opening / closing control means to safely control the drive of the switch,
An apparatus for preventing malfunction of an electric shutter, comprising:

An opening / closing control means provided in the vicinity of an opening / closing device that operates at a predetermined voltage, and outputs a drive signal to the opening / closing device to open / close / stop the shutter;
Arranged at operation locations away from the opening / closing control means, each operation switch for opening / closing / stopping the shutter is provided, and a control signal is output via a control signal line corresponding to each operation switch. Operating means to
Provided inside the operation means, inserted into the control signal line in the vicinity of the operation switch of the operation means, processes the control signal flowing through the control signal line, and outputs it to the open / close control means Signal conversion means;
A detection signal provided at an input stage of the opening / closing control means and corresponding to the operation of each operation switch for opening / closing / stopping the operating means based on the control signal is output to the opening / closing control means. A short circuit of the control signal line is detected by determining whether or not the signal is output through the signal conversion means by operation of the means, and when the short circuit is detected, the opening / closing control means is driven by the opening / closing control means. Operation detecting means for outputting a short-circuit detection signal for safely controlling
An apparatus for preventing malfunction of an electric shutter , comprising:

2. The malfunction prevention device for an electric shutter according to claim 1, wherein the signal conversion means is composed of a passive element that receives a control signal flowing through a control signal line and processes and outputs the control signal.

In order to safely control the shutter even in the event of a short circuit of the signal conversion means provided in the operation means, the operation detection means relates to the stop switch of the operation means regardless of the processing state of the control signal. The malfunction preventing apparatus for an electric shutter according to claim 2, wherein a stop detection signal is output to the open / close control means based on a stop pushing operation.

The control signal line is composed of a total of four core wires of a common line and an open / close / stop line connected to the open / close / stop operation switches,
The control signal is a predetermined AC voltage,
The signal conversion means is composed of a diode connected in one direction for a control signal,
The operation detection means includes a pair of photocouplers that are connected in parallel for each of the open / close / stop lines, each of which is forward-connected and reverse-connected in the connection direction of the diode,
Based on the combination of outputs of the pair of photocouplers, a detection signal corresponding to each open / close / stop operation switch is output to the open / close control means, and whether the control signal is via the diode. 3. A malfunction prevention apparatus for an electric shutter according to claim 2, further comprising: a signal discrimination circuit that discriminates whether or not a short circuit is detected and outputs a short circuit detection signal to the open / close control means.

The control signal line is composed of a total of four core wires of a common line and an open / close / stop line connected to the open / close / stop operation switches,
The control signal is a predetermined DC voltage,
The signal conversion means includes a first resistor having a predetermined resistance value that varies the voltage of the control signal.
The operation detecting means is connected to each of an open / close / stop line, and a second resistor that cooperates with the first resistor to divide the voltage,
A pair of photocouplers connected in parallel from each of the second resistors, each connected in the current direction of the control signal;
One of the photocouplers is connected in series and is deactivated when the voltage is divided by the first and second resistors, and is activated by a high voltage not passing through the first resistor. A zener diode for operating the coupler;
A detection signal corresponding to each open / close / stop operation switch is output to the open / close control means based on a combination of outputs of the pair of photocouplers, and the control signal is transmitted through the first resistor. 3. A malfunction prevention apparatus for an electric shutter according to claim 2, further comprising: a signal discrimination circuit that discriminates whether or not a short circuit is detected and outputs a short circuit detection signal to the open / close control means when a short circuit is detected.

The operation detecting means is constituted by a low voltage operating circuit, the switching control means is constituted by a high voltage operating circuit, and a voltage matching circuit that matches the potential difference between the output of the operation detecting means and the input stage of the switching control means. The malfunction prevention device for an electric shutter according to claim 2, which is connected.