JP2993150B2 - Switch contact welding detection device - Google Patents
Switch contact welding detection deviceInfo
- Publication number
- JP2993150B2 JP2993150B2 JP3049241A JP4924191A JP2993150B2 JP 2993150 B2 JP2993150 B2 JP 2993150B2 JP 3049241 A JP3049241 A JP 3049241A JP 4924191 A JP4924191 A JP 4924191A JP 2993150 B2 JP2993150 B2 JP 2993150B2
- Authority
- JP
- Japan
- Prior art keywords
- contact
- auxiliary
- main
- main contact
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/001—Means for preventing or breaking contact-welding
Landscapes
- Keying Circuit Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電磁接触器や電磁継
電器などの開閉器において、主接点が溶着したときにこ
れを検出する開閉器の接点溶着検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch contact welding detection device for detecting when a main contact is welded in a switch such as an electromagnetic contactor or an electromagnetic relay.
【０００２】[0002]
【従来の技術】モータを運転制御する電磁接触器などに
おいて、その主接点が溶着すると上位開閉器によらなけ
れば電流を遮断できず極めて危険な状態となる。そこ
で、このような事態をいち早く検出するために、図４に
示すような接点溶着検出装置が従来から用いられてい
る。図において、２は電磁接触器の電磁コイルで、入力
スイッチ１を介して制御電源Ｖccに接続されている。ま
た、４は電磁コイル２に駆動されて開閉する電磁接触器
の主接点で、負荷３と主電源Ｖb との間に挿入されてい
る。2. Description of the Related Art In an electromagnetic contactor or the like for controlling the operation of a motor, if its main contact is welded, the current cannot be cut off unless a high-order switch is used, and it is extremely dangerous. Therefore, in order to quickly detect such a situation, a contact welding detection device as shown in FIG. 4 has been conventionally used. In the figure, reference numeral 2 denotes an electromagnetic coil of an electromagnetic contactor, which is connected to a control power supply Vcc via an input switch 1. Reference numeral 4 denotes a main contact of an electromagnetic contactor driven by the electromagnetic coil 2 to open and close, and is inserted between the load 3 and the main power supply Vb .
【０００３】接点溶着検出装置はインバータ５とＡＮＤ
回路６とからなり、インバータ５の入力端は入力スイッ
チ１と電磁コイル２との間に接続され、出力端はＡＮＤ
回路６の一方の入力端に接続されている。また、ＡＮＤ
回路６の他方の入力端は負荷３と主接点４との間に接続
されている。このような接続関係において、主接点４が
ＯＮでも入力スイッチ１がＯＮなら、ＡＮＤ回路６の一
方の入力信号となるインバータ５の反転信号がローレベ
ル（Ｌ）であるため、ＡＮＤ回路６からの信号出力Ｐ0
はＬとなる。これに対して、入力スイッチ１がＯＦＦに
もかかわらず主接点４がＯＮのときは、インバータ５の
反転信号がハイレベル（Ｈ）となり、信号出力Ｐ0 はＨ
となって溶着の発生を示す。[0003] A contact welding detection device is connected to an inverter 5 and an AND.
The input terminal of the inverter 5 is connected between the input switch 1 and the electromagnetic coil 2, and the output terminal is AND
It is connected to one input terminal of the circuit 6. Also, AND
The other input of the circuit 6 is connected between the load 3 and the main contact 4. In such a connection relationship, if the input switch 1 is ON even when the main contact 4 is ON, the inverted signal of the inverter 5 which is one input signal of the AND circuit 6 is at a low level (L). Signal output P 0
Becomes L. On the other hand, when the main contact 4 is ON despite the input switch 1 being OFF, the inverted signal of the inverter 5 becomes high level (H), and the signal output P 0 becomes H
Indicates the occurrence of welding.
【０００４】[0004]
【発明が解決しようとする課題】ところで、このような
接点溶着検出装置は不時の事故に備えて設けられるもの
であり普段は動作する機会がない。したがって、実際に
接点溶着事故が発生したときに確実に動作するかどうか
不安がある。そこで、この発明は、接点が正常な状態に
おいて動作確認ができるようにした開閉器の接点溶着検
出装置を提供することを目的とするものである。However, such a contact welding detecting device is provided in case of an accident in case of accident, and there is usually no opportunity to operate. Therefore, there is an anxiety about whether or not to operate reliably when a contact welding accident actually occurs. SUMMARY OF THE INVENTION It is an object of the present invention to provide a contact welding detection device for a switch in which operation can be confirmed in a state where a contact is normal.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、この発明は、主接点の開閉信号に代わる疑似信号を
発生するテストスイッチを設けるものとする。主接点の
開閉信号は、主接点と連動する補助ａ（常開）接点から
取り出すことができ、その場合にはこの補助ａ接点と並
列にａ接点からなるテストスイッチを接続するものとす
る。また、主接点の開閉信号は、主接点と連動する補助
ｂ（常閉）接点から取り出すこともでき、その場合には
この補助ｂ接点と直列にｂ接点からなるテストスイッチ
を接続するものとする。In order to achieve the above object, the present invention provides a test switch for generating a pseudo signal in place of a main contact opening / closing signal. An open / close signal of the main contact can be taken out from an auxiliary a (normally open) contact that works with the main contact. In this case, a test switch composed of an a contact is connected in parallel with the auxiliary a contact. In addition, the open / close signal of the main contact can be taken out from an auxiliary b (normally closed) contact interlocked with the main contact. In this case, a test switch consisting of the b contact is connected in series with the auxiliary b contact. .
【０００６】[0006]
【作用】テストスイッチの操作により主接点の開閉信号
に代えて疑似信号を発生させ、実際に主接点が溶着した
ときと同じ状態を現出する。ところで、主接点の開閉信
号を図４の従来例のようにそれが挿入された主回路から
取り出すと、多相交流回路の場合は各相ごとに別々に接
点溶着検出装置を取り付けなければならない。そこで、
各相の主接点と共通に連動する補助接点を用い、この補
助接点から主接点の開閉信号を取り出すようにすれば、
どの相の主接点が溶着しても１相分の接点溶着検出装置
で共通に検出でき経済的である。その場合、補助接点は
ａ接点及びｂ接点のいずれでも使用できるが、補助接点
がａ接点ならテストスイッチもａ接点として補助接点に
並列に接続し、また補助接点がｂ接点ならテストスイッ
チもｂ接点として補助接点に直列に接続する。By operating the test switch, a false signal is generated instead of the open / close signal of the main contact, and the same state as when the main contact is actually welded appears. By the way, if the switching signal of the main contact is taken out from the main circuit in which it is inserted as in the conventional example of FIG. 4, in the case of a polyphase AC circuit, a contact welding detection device must be separately provided for each phase. Therefore,
By using auxiliary contacts that work together with the main contacts of each phase, and by extracting the switching signal of the main contacts from this auxiliary contact,
Regardless of which phase of the main contact is welded, it is economical because it can be commonly detected by a contact welding detector for one phase. In this case, the auxiliary contact can be either a contact or b contact. However, if the auxiliary contact is a contact, the test switch is connected in parallel to the auxiliary contact as an a contact. If the auxiliary contact is b contact, the test switch is also b contact. And connected in series to the auxiliary contact.
【０００７】[0007]
【実施例】以下、図に基づいて電磁接触器の接点溶着を
検出するこの発明の実施例について説明する。なお、従
来例と対応する部分には同一の符号を用いるものとす
る。まず、図１は第１の実施例を示すものである。図に
おいて、Ｒ，Ｓ，Ｔの３相交流電源には各相に挿入され
た電磁接触器の主接点４を介してモータ負荷３が接続さ
れている。主接点４を開閉する電磁コイル２は入力スイ
ッチ１を介して制御電源Ｖccに接続されている。An embodiment of the present invention for detecting contact welding of an electromagnetic contactor will be described below with reference to the drawings. Note that the same reference numerals are used for the portions corresponding to the conventional example. First, FIG. 1 shows a first embodiment. In the figure, a motor load 3 is connected to a three-phase AC power supply of R, S, and T via a main contact 4 of an electromagnetic contactor inserted in each phase. An electromagnetic coil 2 for opening and closing the main contact 4 is connected to a control power supply Vcc via an input switch 1.
【０００８】７ａは主接点４と連動する補助ａ接点で、
主接点４を保持する接点支えに一緒に取り付けられてい
る。この補助ａ接点７ａは直列接続された抵抗８を介し
て制御電源Ｖccに接続されている。接点溶着検出装置は
インバータ５とＡＮＤ回路６とからなり、インバータ５
の入力端は入力スイッチ１と電磁コイル２との間に接続
され、出力端はＡＮＤ回路６の一方の入力端に接続され
ている。また、ＡＮＤ回路６の他方の入力端は補助ａ接
点７ａと抵抗８との間に接続されている。９ａはａ接点
からなるテストスイッチで、補助ａ接点７ａと並列に接
続されている。Reference numeral 7a denotes an auxiliary a contact which is linked with the main contact 4.
Attached together to a contact support that holds the main contact 4. The auxiliary a contact 7a is connected to a control power supply Vcc via a resistor 8 connected in series. The contact welding detection device includes an inverter 5 and an AND circuit 6.
Is connected between the input switch 1 and the electromagnetic coil 2, and the output terminal is connected to one input terminal of the AND circuit 6. The other input terminal of the AND circuit 6 is connected between the auxiliary a contact 7a and the resistor 8. Reference numeral 9a denotes a test switch having an a contact, which is connected in parallel with the auxiliary a contact 7a.
【０００９】次に、図２は第２の実施例を示すものであ
る。この実施例においては、第１の実施例における補助
ａ接点７ａに代えて補助ｂ接点７ｂが用いられている。
この補助ｂ接点７ｂは補助ａ接点７ａと背中合わせに接
点支えに取り付けられているもので、同様に主接点４と
連動する。また、ＡＮＤ回路６の他方の入力端にもイン
バータ１０が挿入され、このインバータ１０と補助ｂ接
点７ｂとの間にｂ接点からなるテストスイッチ９ｂが補
助ｂ接点７ｂと直列に挿入されている。Next, FIG. 2 shows a second embodiment. In this embodiment, an auxiliary b-contact 7b is used instead of the auxiliary a-contact 7a in the first embodiment.
The auxiliary b contact 7b is attached to the contact support back to back with the auxiliary a contact 7a, and also cooperates with the main contact 4. An inverter 10 is also inserted into the other input terminal of the AND circuit 6, and a test switch 9b having a b-contact is inserted between the inverter 10 and the auxiliary b-contact 7b in series with the auxiliary b-contact 7b.
【００１０】上記第１及び第２の実施例の動作を説明す
る前に、図３により主接点４及び補助ａ，ｂ接点７ａ，
７ｂの動作特性について説明する。図３の横軸は接点の
開離方向のストローク（Ｓ）を示し、立軸は接点を開閉
する電磁石の負荷荷重（Ｗ）を示している。図におい
て、電磁石の電磁コイル２が励磁されると接点支えがス
トロークＳ0 の点から移動を開始し、Ｓ1 だけ移動した
点で補助ｂ接点７ｂがＯＦＦし、続いてＳ2 だけ移動し
た点で補助ａ接点７ａがＯＮし、更にＳ3 だけ移動した
点で主接点４がＯＮする。そして、更にＳ4 だけ移動す
ると接点支えがストッパに当たって停止する。Before explaining the operation of the first and second embodiments, the main contact 4 and the auxiliary a and b contacts 7a,
7b will be described. The horizontal axis in FIG. 3 indicates the stroke (S) in the contact separating direction, and the vertical axis indicates the load (W) of the electromagnet that opens and closes the contacts. In the figure, that when the electromagnetic coil 2 of the electromagnet is energized the contact support starts moving from the point of the stroke S 0, auxiliary b contact 7b at points shifted by S 1 is then OFF, followed moved by S 2 in assisting a contact 7a is turned ON, further main contact 4 is ON in that moved by S 3. Then, further contact supporting stops against the stopper when moved by S 4.
【００１１】このような接点ストロークにおいて、Ｓ4
は主接点４のワイプ量、Ｓ4 とＳ3 の和は補助ａ接点７
ａのワイプ量、Ｓ1 は補助ｂ接点７ｂのワイプ量という
ことになる。電磁コイル２の励磁を解けば、各接点は上
述動作と逆の順序で移動し、ストロークＳ0 の点で停止
する。ここで、主接点４の内のどれか一つが溶着する
と、電磁コイル２の励磁を解いても接点支えはワイプ量
に相当するＳ4 だけしか戻らない。そのとき、主接点４
よりワイプ量が多い補助ａ接点７ａはＯＮしたままとな
る。また、補助ｂ接点７ｂはＯＮに復帰するまでＳ3 と
Ｓ2の和だけの戻りを残しておりＯＦＦのままである。
すなわち、主接点４が一つでも溶着すると補助ａ接点７
ａはＯＮ状態のままとなり、補助ｂ接点７ｂはＯＦＦ状
態のままとなる。In such a contact stroke, S 4
Is the wipe amount of the main contact 4, and the sum of S 4 and S 3 is the auxiliary a contact 7
Wipe the amount of a, S 1 will be referred to as wipes amount of auxiliary b contact 7b. Solving excitation of the electromagnetic coil 2, each contact moves by the above operation in reverse order, and stops at the point of the stroke S 0. Here, when any one of the of the main contacts 4 is welded, the contact support will not return only S 4 corresponding to the wipe amount by solving the excitation of the electromagnetic coil 2. At that time, the main contact 4
The auxiliary a contact 7a having a larger wipe amount remains ON. The auxiliary b contact 7b remains OFF and leaving only the return sum of S 3 and S 2 until returning to ON.
That is, when even one main contact 4 is welded, the auxiliary a contact 7
a remains in the ON state, and the auxiliary b contact 7b remains in the OFF state.
【００１２】それでは、第１及び第２の実施例について
その動作を説明する。まず、図１において、入力スイッ
チ１のＯＮにより電磁コイル２が励磁され、主接点４及
び補助ａ接点７ａがＯＮする。そのとき、ＡＮＤ回路６
はインバータ５の反転出力がＬとなり、信号出力Ｐ0 は
Ｌとなる。一方、入力スイッチ１がＯＦＦにもかかわら
ず主接点４の溶着により補助ａ接点７ａがＯＮのままと
なると、インバータ５の反転出力及び補助ａ接点７ａか
らの開閉信号が共にＯＮとなって、ＡＮＤ回路６の信号
出力Ｐ0 はＨとなり溶着発生を示す。The operation of the first and second embodiments will now be described. First, in FIG. 1, when the input switch 1 is turned on, the electromagnetic coil 2 is excited, and the main contact 4 and the auxiliary a contact 7a are turned on. At that time, the AND circuit 6
, The inverted output of the inverter 5 becomes L, and the signal output P 0 becomes L. On the other hand, if the auxiliary a-contact 7a remains ON due to the welding of the main contact 4 despite the input switch 1 being OFF, both the inverted output of the inverter 5 and the open / close signal from the auxiliary a-contact 7a are turned ON, and AND The signal output P 0 of the circuit 6 becomes H, indicating that welding has occurred.
【００１３】一方、入力スイッチ１、主接点４及び補助
ａ接点７ａがすべてＯＦＦの図示正常状態でテストスイ
ッチ９ａをＯＮすると、これと並列関係にある補助ａ接
点７ａのＯＮと同じ疑似信号がインバータ５の反転信号
Ｈと共にＡＮＤ回路６に加えられ、信号出力Ｐ0 はＨと
なる。すなわち、電磁接触器のＯＦＦ状態において、テ
ストスイッチ９ａを操作すれば、接点溶着検出装置の作
動を確認することができる。On the other hand, when the test switch 9a is turned on in the illustrated normal state in which the input switch 1, the main contact 4 and the auxiliary a-contact 7a are all off, the same pseudo signal as the ON of the auxiliary a-contact 7a in parallel with the test switch 9a is generated. applied to aND circuit 6 with 5 inverted signal H, the signal output P 0 becomes H. That is, when the test switch 9a is operated in the OFF state of the electromagnetic contactor, the operation of the contact welding detection device can be confirmed.
【００１４】次に、図２において、入力スイッチ１のＯ
Ｎにより主接点４がＯＮするが、それに伴い補助ｂ接点
７ｂがＯＦＦする。したがって、その状態でインバータ
１０の反転信号はＨとなるが、インバータ５の反転信号
はＬであるため、ＡＮＤ回路６の信号出力Ｐ0 はＬであ
る。しかし、入力スイッチ１がＯＦＦしたにもかかわら
ず、主接点４の溶着により補助ｂ接点７ｂがＯＦＦのま
まとなると、インバータ５の反転信号がＨとなり信号出
力Ｐ0 がＨとなる。Next, referring to FIG.
Although the main contact 4 is turned on by N, the auxiliary b contact 7b is turned off accordingly. Accordingly, in this state, the inverted signal of the inverter 10 becomes H, but since the inverted signal of the inverter 5 is L, the signal output P 0 of the AND circuit 6 is L. However, even though the input switch 1 is OFF, the welding of the main contacts 4 when the auxiliary b contact 7b will remain OFF, the inverted signal becomes H signal output P 0 of the inverter 5 becomes H.
【００１５】電磁接触器の図示ＯＦＦ状態において、テ
ストスイッチ９ｂをＯＦＦすると、これと直列関係にあ
る補助ｂ接点７ｂのＯＦＦと同じ疑似信号がＡＮＤ回路
６に加えられ、その入力が共にＨとなる。これにより、
信号出力Ｐ0はＨとなるから、テストスイッチ９ｂの操
作により接点溶着検出装置の作動が確認できることにな
る。When the test switch 9b is turned off in the illustrated OFF state of the electromagnetic contactor, the same pseudo signal as when the auxiliary b contact 7b in series with the test switch 9b is turned off is applied to the AND circuit 6, and both inputs become H. . This allows
Since the signal output P 0 becomes H, the operation of the contact welding detection device is able to confirm by the operation of test switch 9b.
【００１６】以上述べた通り、図示構成によれば、テス
トスイッチ９ａ，９ｂの操作により主接点４の溶着を擬
制して接点溶着検出装置の作動確認が可能である。ま
た、３相の主接点４と連動する補助接点７ａ，７ｂから
主接点４の開閉信号を取り出しているので、１相分の接
点溶着検出装置によりいずれの主接点４の溶着も検出可
能である。As described above, according to the illustrated configuration, the operation of the contact welding detecting device can be confirmed by simulating the welding of the main contact 4 by operating the test switches 9a and 9b. Further, since the opening / closing signal of the main contact 4 is extracted from the auxiliary contacts 7a and 7b interlocked with the three-phase main contact 4, welding of any of the main contacts 4 can be detected by the contact welding detection device for one phase. .
【００１７】[0017]
【発明の効果】この発明によれば、接点溶着検出装置の
動作を随時確認できるので、実際に接点溶着が発生した
ときに動作不良によりこれを見逃すという不安が避けら
れる。また、その際、主接点と連動する補助接点を用い
て開閉信号を取り出す構成とすることにより、多相回路
にも１相分の装置で対応でき、テストスイッチも一つで
済むため経済的である。According to the present invention, since the operation of the contact welding detecting device can be checked at any time, it is possible to avoid anxiety that when contact welding actually occurs, it is overlooked due to a malfunction. At this time, by using a configuration in which an open / close signal is extracted using an auxiliary contact that works in conjunction with the main contact, it is possible to cope with a multi-phase circuit with a single-phase device, and it is economical because only one test switch is required. is there.
【図１】この発明の実施例の結線図である。FIG. 1 is a connection diagram of an embodiment of the present invention.
【図２】この発明の別の実施例の結線図である。FIG. 2 is a connection diagram of another embodiment of the present invention.
【図３】電磁接触器の主接点と補助接点の一般的な動作
特性を説明する線図である。FIG. 3 is a diagram illustrating general operating characteristics of a main contact and an auxiliary contact of an electromagnetic contactor.
【図４】従来例の結線図である。FIG. 4 is a connection diagram of a conventional example.
１ 入力スイッチ ２ 電磁コイル ３ 負荷 ４ 主接点 ５ インバータ ６ ＡＮＤ回路 ７ａ 補助ａ接点 ７ｂ 補助ｂ接点 ９ａ テストスイッチ ９ｂ テストスイッチ Reference Signs List 1 input switch 2 electromagnetic coil 3 load 4 main contact 5 inverter 6 AND circuit 7a auxiliary a contact 7b auxiliary b contact 9a test switch 9b test switch
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−194324（ＪＰ，Ａ) 特開 平１−209613（ＪＰ，Ａ) 特開 平２−114421（ＪＰ，Ａ) 特開 平３−95470（ＪＰ，Ａ) 特開 昭56−81261（ＪＰ，Ａ) 実開 昭63−121337（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H01H 9/54 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-194324 (JP, A) JP-A-1-209613 (JP, A) JP-A-2-114421 (JP, A) JP-A-3- 95470 (JP, A) JP-A-56-81261 (JP, A) JP-A-63-121337 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) H01H 9/54
Claims (2)
と、この主接点を開閉する電磁石を駆動する駆動信号と
の論理積により前記主接点の溶着を検出する開閉器の接
点溶着検出装置において、 前記主接点と連動する補助ａ接点から前記主接点の開閉
信号を取り出すとともに、前記主接点の開閉信号に代わ
る疑似信号を発生するａ接点からなるテストスイッチを
設け、このテストスイッチを前記補助ａ接点と並列に接
続したことを特徴とする開閉器の接点溶着検出装置。A contact welding detection device for a switch for detecting welding of said main contact by a logical product of an opening / closing signal generated by opening / closing operation of said main contact and a drive signal for driving an electromagnet for opening / closing said main contact. Extracting an opening / closing signal of the main contact from an auxiliary a contact which is interlocked with the main contact, and
Test switch consisting of a contact that generates a false signal
A contact welding detection device for a switch, wherein the test switch is connected in parallel with the auxiliary a contact .
と、この主接点を開閉する電磁石を駆動する駆動信号と
の論理積により前記主接点の溶着を検出する開閉器の接
点溶着検出装置において、 前記主接点と連動する補助ｂ接点から前記主接点の開閉
信号を取り出すとともに、前記主接点の開閉信号に代わ
る疑似信号を発生するｂ接点からなるテストスイッチを
設け、このテストスイッチを前記補助ｂ接点と直列に接
続したことを特徴とする開閉器の接点溶着検出装置。2. A contact welding detection device for a switch for detecting welding of said main contact by a logical product of an opening / closing signal generated by opening / closing operation of said main contact and a driving signal for driving an electromagnet for opening / closing said main contact. Extracting the main contact opening / closing signal from the auxiliary b contact interlocking with the main contact, and replacing the main contact opening / closing signal with the main contact
Test switch consisting of a b contact that generates a false signal
A contact welding detecting device for a switch, wherein the test switch is connected in series with the auxiliary b contact .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3049241A JP2993150B2 (en) | 1991-02-21 | 1991-02-21 | Switch contact welding detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3049241A JP2993150B2 (en) | 1991-02-21 | 1991-02-21 | Switch contact welding detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04267015A JPH04267015A (en) | 1992-09-22 |
| JP2993150B2 true JP2993150B2 (en) | 1999-12-20 |
Family
ID=12825379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3049241A Expired - Fee Related JP2993150B2 (en) | 1991-02-21 | 1991-02-21 | Switch contact welding detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2993150B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6574671B2 (en) * | 2015-10-07 | 2019-09-11 | 株式会社アマダホールディングス | Method of executing contact welding detection test of electromagnetic switch in press machine and press machine |
| CN109490762B (en) * | 2017-09-12 | 2024-05-14 | 浙江正泰电器股份有限公司 | Method and device for detecting mirror contact of contactor |
| KR102691342B1 (en) * | 2019-10-30 | 2024-08-01 | 주식회사 엘지에너지솔루션 | Relay Having Fault Diagnosis Function and Diagnosis Method Thereof |
-
1991
- 1991-02-21 JP JP3049241A patent/JP2993150B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04267015A (en) | 1992-09-22 |
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