JP2843172B2 - Load control device - Google Patents
Load control deviceInfo
- Publication number
- JP2843172B2 JP2843172B2 JP18215591A JP18215591A JP2843172B2 JP 2843172 B2 JP2843172 B2 JP 2843172B2 JP 18215591 A JP18215591 A JP 18215591A JP 18215591 A JP18215591 A JP 18215591A JP 2843172 B2 JP2843172 B2 JP 2843172B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- life
- coil
- load
- temperature
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Protection Of Generators And Motors (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Time Recorders, Dirve Recorders, Access Control (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電動機などの負荷の開
閉，保護などを行なうための主回路器具の他に、負荷の
状態表示及び操作のための表示装置及び操作装置を備え
た負荷制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load control system having a display device and an operation device for displaying and operating a load state, in addition to a main circuit device for opening / closing and protecting a load such as an electric motor. Related to the device.
【０００２】[0002]
【従来の技術】電動機や抵抗負荷などの開閉及び保護機
能を備えた負荷制御装置の一例としてコントロールセン
タが知られている。即ちコントロールセンタにおいて
は、電磁接触器，配線用遮断器，電流変換器，制御用補
助リレーなどの主回路器具を単位回路毎にまとめた複数
のユニットを多段に収納すると共に、各ユニット毎に始
動停止表示ランプなどを含む表示装置と始動用操作スイ
ッチ，停止用操作スイッチなどを含む操作装置とを備え
た表示操作パネルを設けることにより構成されている。2. Description of the Related Art A control center is known as an example of a load control device having a switching function and a protection function for an electric motor and a resistance load. That is, in the control center, a plurality of units in which main circuit devices such as an electromagnetic contactor, a wiring breaker, a current converter, and a control auxiliary relay are grouped for each unit circuit are housed in multiple stages, and each unit is started. It is configured by providing a display operation panel including a display device including a stop display lamp and the like and an operation device including a start operation switch, a stop operation switch, and the like.
【０００３】また近年においては、ユニットの仕様変更
に容易に対処可能とするために、電子応用技術を採用す
ることも行なわれている。即ち、この場合にはマイクロ
コンピュータより成る論理演算回路を設け、この論理演
算回路によって前記操作装置による入力信号及び電流変
換器により検出した主回路電流の大小に応じた前記主回
路器具及び表示装置の制御を行なう構成とされる。In recent years, in order to easily cope with a change in the specification of a unit, an electronic applied technology has been adopted. That is, in this case, a logical operation circuit composed of a microcomputer is provided, and the logical operation circuit controls the main circuit device and the display device according to the magnitude of the input signal from the operating device and the main circuit current detected by the current converter. It is configured to perform control.
【０００４】[0004]
【発明が解決しようとする課題】ところで、このような
コントロールセンタを保守管理していく上で問題となる
のは、多数用いられる各種器具の寿命である。中でもコ
イル類は絶縁劣化の進行が比較的早いため、コイルを利
用した電磁接触器や制御用補助リレーにあっては、他の
配線用遮断器，始動用操作スイッチなどに比べて寿命が
短いという事情下にある。このため従来では、電磁接触
器や制御用補助リレーなどの健全性を定期的にサンプリ
ング調査したり、或いは電磁接触器などの比較的寿命が
短い部品を一定時期毎に新品と交換することが行なわれ
ている。A problem in maintenance and management of such a control center is the life of a variety of instruments used. In particular, the deterioration of insulation of coils is relatively fast, so the life of an electromagnetic contactor or control auxiliary relay using a coil is shorter than that of other circuit breakers or starting operation switches. Under circumstances. For this reason, conventionally, the soundness of the electromagnetic contactor and the auxiliary relay for control is regularly sampled and investigated, or a part having a relatively short life, such as the electromagnetic contactor, is replaced with a new one at regular intervals. Have been.
【０００５】しかしながら、斯かるサンプリング調査及
び部品交換のためには膨大な労力と多額の費用を要する
ものであり、従来のコントロールセンタではこのような
点が未解決の課題となっていた。[0005] However, such sampling survey and replacement of parts require enormous labor and a large amount of cost, and such a point has not been solved in the conventional control center.
【０００６】本発明は、上記事情並びに近年の負荷制御
装置においては操作装置による入力信号及び主回路電流
の大小に応じた主回路器具及び表示装置の制御を予め記
憶した制御プログラムに基づいて行なう論理演算回路を
設けることが行なわれているという事情に鑑みてなされ
たものであり、その目的は、コイルを利用した特定器具
の残り寿命を論理演算回路により精度良く自己判断する
と共に、その残り寿命を表示することができ、以て保守
管理の簡略化を実現できる負荷制御装置を提供するにあ
る。According to the present invention, there is provided a logic for performing control of a main circuit device and a display device according to the magnitude of an input signal and a main circuit current by an operation device in a load control device of recent years based on a control program stored in advance. It is made in view of the fact that an arithmetic circuit is provided, and its purpose is to accurately determine the remaining life of a specific appliance using a coil by a logical operation circuit and to determine the remaining life. It is an object of the present invention to provide a load control device which can display the load and thereby can simplify the maintenance management.
【０００７】[0007]
【課題を解決するための手段】本発明は上記目的を達成
するために、負荷の開閉，保護用などの主回路器具、前
記負荷の状態表示のため表示装置、負荷の操作のための
操作装置を設けると共に、前記操作装置による入力信号
及び主回路電流の大小に応じた前記主回路器具及び表示
装置の制御を予め記憶した制御プログラムに基づいて行
なう論理演算回路を設けた負荷制御装置において、前記
主回路器具のうちのコイルを利用した特定器具のコイル
温度を検出する温度検出手段、前記特定器具の稼働時間
を検出する時間検出手段とを設けた上で、前記温度検出
手段により検出されたコイル温度結果に基づいて、前記
論理演算回路に予め設定されたコイル温度に基づく前記
特定器具の寿命算出のプログラムにより、前記特定器具
の寿命を演算し、前記時間検出手段が検出した前記特定
器具の稼働時間により前記特定器具の寿命を補正し残り
寿命を推測すると共に、その推測結果を前記表示装置に
表示させる構成としたものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a main circuit device for opening / closing and protecting a load, a display device for displaying the status of the load, and an operating device for operating the load. And a load control device provided with a logical operation circuit that performs control of the main circuit device and the display device according to the magnitude of the input signal and the main circuit current by the operation device based on a control program stored in advance. A temperature detecting means for detecting a coil temperature of a specific device using a coil of the main circuit device, a time detecting device for detecting an operation time of the specific device, and a coil detected by the temperature detecting device. Based on the temperature result, by a program for calculating the life of the specific appliance based on the coil temperature preset in the logic operation circuit, calculate the life of the specific appliance, The operation time of the specific instrument serial time detection means detects and corrects the life of the particular instrument with guess the remaining lifetime, in which a configuration for displaying the estimation result to the display device.
【０００８】[0008]
【作用】コイルを利用した器具は、そのコイルの絶縁劣
化によって寿命切れとなることが多い。斯かるコイルの
絶縁劣化速度つまり上記器具の寿命を決定するファクタ
としては通電継続時間（稼働時間）とコイル温度とがあ
る。[Effects] In many cases, the life of a device using a coil becomes short due to deterioration of insulation of the coil. Factors that determine the rate of insulation deterioration of the coil, that is, the life of the device, include the duration of energization (operating time) and the coil temperature.
【０００９】しかして時間検出手段は主回路器具のうち
コイルを利用した特定器具の稼働時間を検出し、温度検
出手段は特定器具のコイルの温度を検出する。従ってこ
のコイル温度は特定器具の寿命と密接な関係を有したも
のとなり、コイル温度に対する当該特定器具の寿命が判
明していれば、その寿命を上記コイル温度と上記稼働時
間に基づいて推測することが可能となる。そこで論理演
算回路は予め設定された演算式による前記特定器具のコ
イル温度と稼働時間との演算結果に基づいて特定器具の
残り寿命を推測し、その推測結果を前記表示装置に表示
させる。つまりこのような表示に基づいて特定器具の交
換時期を知ることができるものであり、以て保守管理の
簡略化を実現できる。Thus, the time detecting means detects the operating time of the specific instrument using the coil among the main circuit instruments, and the temperature detecting means detects the temperature of the coil of the specific instrument. Therefore, this coil temperature has a close relationship with the service life of the specific device.If the service life of the specific device with respect to the coil temperature is known, the service life should be estimated based on the coil temperature and the operating time. Becomes possible. Therefore, the logic operation circuit estimates the remaining life of the specific device based on the calculation result of the coil temperature and the operation time of the specific device according to a preset operation expression, and displays the estimation result on the display device. That is, it is possible to know the time of replacement of the specific appliance based on such a display, thereby simplifying the maintenance management.
【００１０】[0010]
【実施例】以下、本発明をコイトロールセンタに適用し
た一実施例について図面を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a roll center will be described below with reference to the drawings.
【００１１】即ち、図１にはコントロールセンタの１ユ
ニット分の回路構成が示されている。この図１におい
て、三相の電源母線１と負荷である電動機２との間の主
回路３には、夫々主回路器具たる配線用遮断器４，電磁
接触器５，主回路電流検出用の電流変換器６及び地絡電
流検出用の零相変流器７が設けられている。配線用遮断
器４の負荷側には、操作用変圧器８の一次側が接続され
ており、この変圧器８の二次側には制御母線９，１０が
接続されていると共に、直流定電圧を発生するための電
源回路１１が接続されている。That is, FIG. 1 shows a circuit configuration for one unit of the control center. In FIG. 1, a main circuit 3 between a three-phase power supply bus 1 and a motor 2 as a load includes a circuit breaker 4, a magnetic contactor 5, and a current for detecting a main circuit current, which are main circuit devices, respectively. A converter 6 and a zero-phase current transformer 7 for detecting a ground fault current are provided. A primary side of an operation transformer 8 is connected to a load side of the circuit breaker 4, and control buses 9 and 10 are connected to a secondary side of the transformer 8 and a DC constant voltage is connected to the primary side of the transformer 8. A power supply circuit 11 for generating power is connected.
【００１２】上記電源回路１１から給電される制御回路
１２は次のような構成となっている。即ち、制御回路１
２はマイクロコンピュータより成る論理演算回路１３を
中心に構成されたもので、この論理演算回路１３は記憶
回路１４に記憶された制御プログラム並びにＡ−Ｄ変換
回路１５，入力回路１６，設定回路１７，計測回路２２
及び受信回路２８から与えられる各信号に基づいた保護
動作並びに制御動作を実行する。The control circuit 12 supplied with power from the power supply circuit 11 has the following configuration. That is, the control circuit 1
Numeral 2 mainly comprises a logical operation circuit 13 composed of a microcomputer. The logical operation circuit 13 includes a control program stored in a storage circuit 14, an A / D conversion circuit 15, an input circuit 16, a setting circuit 17, Measurement circuit 22
And a protection operation and a control operation based on each signal provided from the reception circuit 28.
【００１３】記憶回路１４に記憶された制御プログラム
中には、過電流，欠相，不足電流，地絡などの保護動作
並びに瞬時停電再始動，限時再始動などの制御動作を実
行するための周知のプログラムの他に、コイルを利用し
た特定器具たる前記電磁接触器５の寿命推定用の後述す
る内容のプログラムが含まれている。The control program stored in the storage circuit 14 includes a well-known operation for executing a protection operation such as an overcurrent, an open phase, an undercurrent, or a ground fault, and a control operation such as an instantaneous power failure restart or a timed restart. In addition to the above-mentioned program, a program described below for estimating the life of the electromagnetic contactor 5, which is a specific device using a coil, is included.
【００１４】Ａ−Ｄ変換回路１５は電流変換器６が検出
した主回路電流を示す電圧信号並びに零相変流器７が検
出した地絡電流を示す電圧信号をデジタル変換する構成
である。入力回路１６は制御母線９に対して電磁接触器
５の常閉形補助接点５ａ及び夫々操作装置たる始動用操
作スイッチ１８，停止用操作スイッチ１９を介して接続
されており、それらのオンに応じた各オン信号を入力信
号として受けるようになっている。The A / D conversion circuit 15 is configured to digitally convert a voltage signal indicating a main circuit current detected by the current converter 6 and a voltage signal indicating a ground fault current detected by the zero-phase current transformer 7. The input circuit 16 is connected to the control bus 9 via a normally closed auxiliary contact 5a of the electromagnetic contactor 5 and a start operation switch 18 and a stop operation switch 19, which are operation devices, respectively. Each ON signal is received as an input signal.
【００１５】設定回路１７は多数の選択スイッチなどを
組合わせて構成されたもので、前記記憶回路１４に記憶
された制御プログラムによる保護特性及び瞬時停電保護
時間などの選択の他に、前記電磁接触器５の励磁コイル
５ｂのコイル温度で決まる当該電磁接触器５の残り寿命
算出の定数設定を行ない得るように構成されている。具
体的には、上記残り寿命は電磁接触器５の稼働時間に換
算した寿命時間Ｈmaxとして設定されるものであり、こ
の寿命時間Ｈmax は励磁コイル５ｂのコイル温度，周囲
温度，コイル材料などを考慮して決定される。尚、上記
励磁コイル５ｂは、制御母線９と制御回路１２内の出力
回路２０との間に接続されており、論理演算回路１３に
より上記出力回路２０を通じて制御される。The setting circuit 17 is constituted by combining a large number of selection switches and the like. In addition to the selection of the protection characteristics and the instantaneous power failure protection time by the control program stored in the storage circuit 14, the setting circuit 17 also includes the electromagnetic contact switch. The configuration is such that the constant setting for calculating the remaining life of the electromagnetic contactor 5 determined by the coil temperature of the exciting coil 5b of the device 5 can be performed. Specifically, the above-mentioned remaining life is set as a life time Hmax converted into the operation time of the electromagnetic contactor 5, and this life time Hmax takes into account the coil temperature, the ambient temperature, the coil material, etc. of the exciting coil 5b. Is determined. The exciting coil 5b is connected between the control bus 9 and the output circuit 20 in the control circuit 12, and is controlled by the logical operation circuit 13 through the output circuit 20.
【００１６】また制御回路１２において、電動機２の状
態を表示するために設けられた表示装置２１は、具体的
には図示しないが、電動機２の運転及び停止状態表示ラ
ンプ，過負荷表示ランプ，電磁接触器５の残り寿命表示
ランプ，その残り寿命をデジタル表示する表示器などを
含んで構成されており、特に上記残り寿命表示ランプ
は、その点燈状態で電磁接触器５の残り寿命が一定時間
Ｈｋ以下になったことを示すようになっている。In the control circuit 12, a display device 21 provided for displaying the state of the electric motor 2 is not specifically shown, but an operation / stop state display lamp, an overload display lamp, an electromagnetic The lamp includes a lamp for indicating the remaining life of the contactor 5, a display for digitally displaying the remaining life, and the like. In particular, the lamp for indicating the remaining life indicates that the remaining life of the electromagnetic contactor 5 in the lighting state is constant. Hk or less.
【００１７】時間検出手段たる計測回路２２は、前記電
磁接触器５の補助接点５ａ及び始動用操作スイッチ１８
からの各オン信号を受けるようになっており、それらオ
ン信号のアンド条件が成立している時間を計数すること
によって電磁接触器５の稼働時間Ｔを検出するようにな
っている。温度検出手段たる電流−温度変換回路２４
は、直流電圧の供給を行なうＤＣ電源２３より電磁接触
器５の励磁コイル５ｂに直流電圧を印加し、励磁コイル
５ｂのコイル温度により変動するコイル抵抗を電流値の
変動にて検出し、その電流値を温度値に変換して励磁コ
イル５ｂのコイル温度を出力するようになっている。The measuring circuit 22 serving as a time detecting means includes an auxiliary contact 5a of the electromagnetic contactor 5 and an operation switch 18 for starting.
The ON time of the electromagnetic contactor 5 is detected by counting the time during which the AND condition of the ON signals is satisfied. Current-temperature conversion circuit 24 serving as temperature detection means
Applies a DC voltage to the exciting coil 5b of the electromagnetic contactor 5 from a DC power supply 23 that supplies a DC voltage, detects a coil resistance that fluctuates according to a coil temperature of the exciting coil 5b by detecting a change in current value, and detects the current. The value is converted into a temperature value to output the coil temperature of the exciting coil 5b.
【００１８】また、制御回路１２内に構成されたコイル
温度の測定部２７を電気的に絶縁するため、電流−温度
変換回路２４より出力されたコイル温度値はＡ−Ｄ変換
回路２５にてデジタル値に変換され、送信回路２６から
受信回路２８へ光送信させることにより回路を絶縁でき
るようになっている。Further, in order to electrically insulate the coil temperature measuring unit 27 formed in the control circuit 12, the coil temperature value output from the current-temperature conversion circuit 24 is digitally converted by the AD conversion circuit 25. The value is converted into a value, and light is transmitted from the transmission circuit 26 to the reception circuit 28 so that the circuit can be insulated.
【００１９】ここで、電磁接触器５の寿命低下量は、図
２（ａ）に示すように周囲温度Ｐの関数で表されるもの
である。また電磁接触器５は、その励磁コイル５ｂの絶
縁劣化によって寿命切れとなることが多い。このような
励磁コイル５ｂの絶縁劣化速度に対応した電磁接触器５
の残り寿命は、周囲温度Ｐが一定の場合、その稼働時間
Ｔに依存する。つまり図２（ｂ）に示すように、電磁接
触器５の残り寿命は稼働時間Ｔが長くなる程短くなるも
のである。Here, the life reduction amount of the electromagnetic contactor 5 is represented by a function of the ambient temperature P as shown in FIG. In addition, the life of the electromagnetic contactor 5 is often short due to insulation deterioration of the exciting coil 5b. The electromagnetic contactor 5 corresponding to such an insulation deterioration rate of the exciting coil 5b.
Is dependent on the operating time T when the ambient temperature P is constant. That is, as shown in FIG. 2B, the remaining life of the electromagnetic contactor 5 decreases as the operating time T increases.
【００２０】しかして論理演算回路１３は、設定回路１
７より設定された電磁接触器５の設置周囲の温度、励磁
コイル５ｂのコイル材料と受信回路２８より出力された
コイル温度とをデータに、記憶回路１４より励磁コイル
の寿命算出プログラムに基づき電磁接触器５の寿命を算
出し、計測回路２２より検出された稼働時間により寿命
を補正し、電磁接触器５の残り寿命を補正し、電磁接触
器５の残り寿命を推測する。Thus, the logical operation circuit 13 comprises the setting circuit 1
7 based on the temperature around the installation of the electromagnetic contactor 5, the coil material of the exciting coil 5 b and the coil temperature output from the receiving circuit 28, based on the program for calculating the life of the exciting coil from the storage circuit 14. The life of the electromagnetic contactor 5 is calculated, the life is corrected based on the operation time detected by the measuring circuit 22, the remaining life of the electromagnetic contactor 5 is corrected, and the remaining life of the electromagnetic contactor 5 is estimated.
【００２１】そして上記推測結果を前記表示装置２１が
有する表示器にデジタル表示させると共に、その推測残
り寿命が一定時間Ｈｋ以下であった場合には、表示装置
２１が有する残り寿命表示ランプを点灯させる。The result of the estimation is digitally displayed on a display of the display device 21. If the estimated remaining life is less than a predetermined time Hk, the remaining life indicator lamp of the display device 21 is turned on. .
【００２２】[0022]
【発明の効果】本発明の負荷制御装置によれば以上の説
明により明らかなように、負荷の開閉，保護などを行な
うための主回路器具並びに負荷の状態表示のための表示
装置を制御するように設けられた論理演算回路を利用す
ることによって、コイルを利用した特定器具の残り寿命
を自己判断すると共に、その残り寿命を表示することが
できるものであり、これにより保守管理のために従来の
ような膨大な労力と多額の費用を要することがなくなる
など、その保守管理の簡略化を実現できるという優れた
効果を奏することができる。According to the load control device of the present invention, as apparent from the above description, the main circuit device for opening / closing and protecting the load and the display device for displaying the status of the load are controlled. By using the logical operation circuit provided in the above, it is possible to self-determine the remaining life of the specific appliance using the coil and to display the remaining life, thereby enabling the conventional equipment to be used for maintenance management. Such an enormous amount of labor and a large amount of cost are not required, and an excellent effect that the maintenance management can be simplified can be achieved.
【図１】本発明の一実施例を示す概略的な電気回路構成
図FIG. 1 is a schematic electric circuit configuration diagram showing one embodiment of the present invention.
【図２】主回路器具の寿命と周囲温度及び稼働時間との
各関係を示す特性図FIG. 2 is a characteristic diagram showing a relationship between a life of a main circuit device, an ambient temperature, and an operation time.
１は電源母線、２は電動機（負荷）、３は主回路、４は
配線用遮断器（主回路器具）、５は電磁接触器（主回路
器具、特定器具）、５ａは補助接点、５ｂは励磁コイ
ル、６は電流変換器（主回路器具）、７は零相変流器
（主回路器具）、１２は制御回路、１３は論理演算回
路、１７は設定回路、１８は始動用操作スイッチ（操作
装置）、１９は停止用操作スイッチ（操作装置）、２１
は表示装置、２２は計測回路（時間検出手段）、２４は
電流−温度変換回路（温度検出手段）を示す。1 is a power supply bus, 2 is a motor (load), 3 is a main circuit, 4 is a circuit breaker (main circuit device), 5 is an electromagnetic contactor (main circuit device, specific device), 5a is an auxiliary contact, and 5b is An exciting coil, 6 is a current converter (main circuit device), 7 is a zero-phase current transformer (main circuit device), 12 is a control circuit, 13 is a logic operation circuit, 17 is a setting circuit, and 18 is a start operation switch ( Operation device), 19 is a stop operation switch (operation device), 21
Denotes a display device, 22 denotes a measuring circuit (time detecting means), and 24 denotes a current-temperature converting circuit (temperature detecting means).
Claims (1)
と、前記負荷の状態表示のための表示装置と、負荷の操
作のための操作装置とを備えたものであって、前記操作
装置による入力信号及び主回路電流の大小に応じた前記
主回路器具及び表示装置の制御を予め記憶した制御プロ
グラムに基づいて行なう論理演算回路が設けられた負荷
制御装置において、前記主回路器具のうちのコイルを利
用した特定器具のコイル温度を検出する温度検出手段
と、前記特定器具の稼動時間を検出する時間検出手段と
を設けた上で、前記温度検出手段により検出されたコイ
ル温度結果に基づいて、前記論理演算回路に予め設定さ
れたコイル温度に基づく前記特定器具の寿命算出のプロ
グラムにより前記特定器具の寿命を演算し、前記時間検
出手段が検出した前記特定器具の稼動時間により前記特
定器具の寿命を補正し残り寿命を推測するとともに、そ
の推測結果を前記表示装置に表示させる構成としたこと
を特徴とする負荷制御装置。1. An operating device comprising: a main circuit device for opening / closing and protecting a load; a display device for displaying a status of the load; and an operating device for operating the load. A load control device provided with a logical operation circuit that performs control of the main circuit device and the display device according to the magnitude of the input signal and the main circuit current according to a control program stored in advance. A temperature detecting means for detecting a coil temperature of a specific instrument using a coil, and a time detecting means for detecting an operation time of the specific instrument are provided, and based on a coil temperature result detected by the temperature detecting means. The life of the specific appliance is calculated by a program for calculating the life of the specific appliance based on a coil temperature preset in the logical operation circuit, and the characteristic detected by the time detecting means is calculated. A load control device, wherein the life of the specific device is corrected based on the operating time of the fixed device, the remaining life is estimated, and the estimation result is displayed on the display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18215591A JP2843172B2 (en) | 1991-07-23 | 1991-07-23 | Load control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18215591A JP2843172B2 (en) | 1991-07-23 | 1991-07-23 | Load control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0528338A JPH0528338A (en) | 1993-02-05 |
| JP2843172B2 true JP2843172B2 (en) | 1999-01-06 |
Family
ID=16113323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18215591A Expired - Lifetime JP2843172B2 (en) | 1991-07-23 | 1991-07-23 | Load control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2843172B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485491A (en) * | 1994-03-31 | 1996-01-16 | Westinghouse Electric Corporation | Online diagnostic system for rotating electrical apparatus |
| CN102226833A (en) * | 2011-04-10 | 2011-10-26 | 沈阳航空航天大学 | Portable aerogenerator life detector |
| DE102018219642A1 (en) * | 2018-11-16 | 2020-05-20 | Robert Bosch Gmbh | Method for determining a remaining operating time of a magnetic coil of an electromagnetic actuator |
-
1991
- 1991-07-23 JP JP18215591A patent/JP2843172B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0528338A (en) | 1993-02-05 |
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