JPH0433517A - Motor controller - Google Patents
Motor controllerInfo
- Publication number
- JPH0433517A JPH0433517A JP2141029A JP14102990A JPH0433517A JP H0433517 A JPH0433517 A JP H0433517A JP 2141029 A JP2141029 A JP 2141029A JP 14102990 A JP14102990 A JP 14102990A JP H0433517 A JPH0433517 A JP H0433517A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- current
- setting
- abnormality
- reference value
- 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.)
- Granted
Links
- 230000005856 abnormality Effects 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims description 14
- 230000006870 function Effects 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000006698 induction Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Protection Of Generators And Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的コ
（産業上の利用分野）
本発明は、電磁接触器等の開閉器を用いて電動機の開閉
制御、保護を行う電動機制御装置に係り、特に保護動作
を行うための判定用基準値を自動的に設定し得るように
した電動機制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Field of Industrial Application) The present invention relates to a motor control device that controls opening/closing and protects a motor using a switch such as an electromagnetic contactor. The present invention relates to a motor control device that can automatically set a reference value for determination.
（従来の技術）
最近、コントロールセンタの単位装置等においてマイク
ロコンピュータを応用することにより誘導電動機の運転
・停止制御、保護、監視等の多数の機能を備えた電動機
制御装置を収納したものが供されている。この種の電動
機制御装置の保護機能は、誘導電動機の主回路電流を異
常判定用基準値と比較する監視を常時行い、過負荷、欠
相、地絡等の異常を検出すると主回路に接続した電磁接
触器を開路することにより、誘導電動機を保護し、さら
に異常原因を外部に表示するようになっている。(Prior Art) Recently, unit devices of control centers, etc. that house motor control devices that have many functions such as operation/stop control, protection, and monitoring of induction motors have been provided by applying microcomputers. ing. The protection function of this type of motor control device is to constantly monitor the induction motor's main circuit current by comparing it with a reference value for abnormality determination, and when an abnormality such as overload, open phase, or ground fault is detected, it connects to the main circuit. By opening the electromagnetic contactor, the induction motor is protected and the cause of the abnormality is displayed externally.
（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において異常
判定用基準値の設定は、据付は現場において電動機の起
動電流、起動時間および定常電流を実際に計測しその計
測値から基準値を決めこれを設定するようにしている。(Problem to be Solved by the Invention) By the way, in setting the reference value for abnormality judgment in such a control center, the starting current, starting time, and steady current of the motor are actually measured at the installation site, and the reference value is determined from the measured values. I decide on a value and set it.
しかしこの場合において、設定電流が定常値より大き過
ぎると過負荷保護ができなくなり、設定時間が短いと起
動時に誤動作し、逆に長すぎると電動機の耐量を越え保
護かできなくなる問題がある。However, in this case, if the set current is too large than the steady value, overload protection will not be possible, if the set time is too short, a malfunction will occur at startup, and if the set time is too long, the motor will exceed its withstand capacity and protection will not be possible.
そこで本発明の目的は、保護条件に最適な異常判定用基
準値を自動的に設定できる電動機制御装置を提供するこ
とにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a motor control device that can automatically set a reference value for abnormality determination that is optimal for protection conditions.
［発明の構成］
（課題を解決するための手段）
本発明による電動機制御装置は、電源母線および電動機
間の主回路を開閉する電磁接触器と、主回路電流を検出
する電流変換器と、前記電磁接触器を開閉するための起
動および停止操作信号を入力する入力回路と、前記電流
変換器からの検出信号を異常判定用基準値と比較して異
常の有無を判定し異常時に電磁接触器の開放指令を出力
する論理演算回路とからなる電動機制御装置において、
前記電流変換器からの検出信号から電動機の起動電流、
起動時間および定常電流である実負荷ブタを得これを記
憶する記憶回路と、異常判定基準値として複数種の電流
パターンが予め設定されている設定回路と、前記記憶回
路に記憶されている実負荷パターンと前記設定回路に設
定されている複数種の電流パターンと比較し予め定めら
れた条件に最も近い関係にある電流パターンを選択しこ
れを前記異常判定用基準値として設定する自動設定回路
とを設けたことを特徴とする。[Structure of the Invention] (Means for Solving the Problems) A motor control device according to the present invention includes: an electromagnetic contactor that opens and closes a main circuit between a power bus and a motor; a current converter that detects a main circuit current; An input circuit that inputs start and stop operation signals for opening and closing the electromagnetic contactor, and a detection signal from the current converter are compared with a reference value for abnormality determination to determine the presence or absence of an abnormality. In a motor control device consisting of a logical operation circuit that outputs an open command,
Starting current of the motor from the detection signal from the current converter,
A memory circuit that obtains and stores actual load values that are startup time and steady current, a setting circuit in which multiple types of current patterns are preset as abnormality determination reference values, and an actual load that is stored in the memory circuit. an automatic setting circuit that compares the pattern with multiple types of current patterns set in the setting circuit, selects a current pattern that has the closest relationship to predetermined conditions, and sets this as the reference value for abnormality determination. It is characterized by having been established.
（作用）
電動機の試験運転など最初の運転で記憶回路に実負荷デ
ータが記憶されるとこれが予め設定されている複数種の
電流パターンと比較され、そのパターンのうち保護条件
に最も近い少なくとも一つの電流パターンが異常判定用
基準値として自動的に選択され設定される。(Function) When actual load data is stored in the memory circuit during the first operation such as a test run of the motor, it is compared with multiple types of preset current patterns, and at least one of the patterns that is closest to the protection condition is selected. The current pattern is automatically selected and set as the reference value for abnormality determination.
（実施例） 以下本発明の一実施例を図面を参照しながら説明する。(Example) An embodiment of the present invention will be described below with reference to the drawings.
］は負荷である誘導電動機２に電源を供給する三相の主
回路で、この主回路１には、配線用遮断器３、電磁接触
器４、主回路電流を検出するための電流変換器即ち変流
器５及び主回路の零相電流を検出する零相変流器６が主
回路器具として介在されている。配線用遮断器３の負荷
側と電磁接触器４の電源側との間の主回路１の二相間に
は操作用変圧器７の一次巻線７ａが接続されている。こ
の操作用変圧器７の二次巻線７ｂの出力電圧は、操作回
路用電源として、母線８に印加される。この母線８にこ
れを一方の電源線とするように各一端が接続された電磁
接触機器４のコイル４ ａ ％および補助接点４ｂ、起
動操作スイッチ９、停止操作スイッチ１０の各他端は制
御回路１１の操作信号出力端子１１ａ１及び操作信号入
力端子１１ｂに接続されている。これにより制御回路１
１は起動操作スイッチ９からの起動信号及び停止操作ス
イッチ１０からの停止信号を受けてコイル４ａを通断電
することにより、電磁接触器４の開閉を行なうと共に、
変流器５、零相変流器６からの電流信号を人力して誘導
電動機の過負荷保護、欠相保護、地絡保護等の保護動作
を行なう機能を有している。制御回路１１の電源は電磁
接触器４のコイル４ａ等により発生する開閉ノイズの侵
入を防ぐために、操作用変圧器７の二次側とは絶縁され
た三次巻線７Ｃより供給されるようになっている。] is a three-phase main circuit that supplies power to an induction motor 2, which is a load, and this main circuit 1 includes a molded circuit breaker 3, an electromagnetic contactor 4, and a current converter for detecting the main circuit current. A current transformer 5 and a zero-sequence current transformer 6 for detecting the zero-sequence current of the main circuit are interposed as main circuit devices. A primary winding 7a of an operating transformer 7 is connected between two phases of the main circuit 1 between the load side of the molded circuit breaker 3 and the power source side of the electromagnetic contactor 4. The output voltage of the secondary winding 7b of the operating transformer 7 is applied to the bus bar 8 as a power source for the operating circuit. The coil 4a of the electromagnetic contact device 4, which has one end connected to the bus bar 8 so as to use this as one power line, and the other ends of the auxiliary contact 4b, the start operation switch 9, and the stop operation switch 10 are connected to the control circuit. It is connected to the operation signal output terminal 11a1 and the operation signal input terminal 11b of No. 11. As a result, control circuit 1
1 receives a start signal from the start operation switch 9 and a stop signal from the stop operation switch 10 and disconnects the current from the coil 4a, thereby opening and closing the electromagnetic contactor 4.
It has a function of manually inputting current signals from the current transformer 5 and zero-phase current transformer 6 to perform protection operations such as overload protection, open phase protection, and ground fault protection for the induction motor. Power for the control circuit 11 is supplied from a tertiary winding 7C that is insulated from the secondary side of the operating transformer 7 in order to prevent intrusion of switching noise generated by the coil 4a of the electromagnetic contactor 4, etc. ing.
また、制御回路１１は、変流器５および零相変流器６か
ら出力された主回路電流の大きさに応じる検出電流を入
力する電流検出回路１２、この電流検出回路１２からの
検出信号を演算して主回路電流の異常を監視すると共に
、電磁接触器４を開閉する駆動回路１３に指令を出力す
る論理演算回路１４、主回路電流値や主回路１の異常原
因等を表示する表示回路１５及び異常内容を外部に出力
するための外部出力回路１６から構成されている。The control circuit 11 also includes a current detection circuit 12 that inputs a detection current corresponding to the magnitude of the main circuit current output from the current transformer 5 and the zero-phase current transformer 6, and a detection signal from the current detection circuit 12. A logic operation circuit 14 that calculates and monitors abnormalities in the main circuit current and outputs commands to the drive circuit 13 that opens and closes the electromagnetic contactor 4, and a display circuit that displays the main circuit current value, the cause of the abnormality in the main circuit 1, etc. 15 and an external output circuit 16 for outputting abnormality details to the outside.
制御回路１１には、更に本発明の目的に対応して以下に
述べる回路が設けられている。即ち制御回路１１には記
憶回路１７が設けられ、この記憶回路１７には電動機２
の実負荷状態での試験運転状態で電流検出回路１２によ
り検出された主回路電流検出信号によって第２図に示す
起動電流１１、起動時間ｔ１および定常電流１２が実負
荷データとして記憶される。本例ではこの記憶は電流レ
ベルが時間の関数の形である電流パターンとしてなされ
る。一方、設定回路１８には異常判定用基準値として第
２図に示すような複数種の設定電流ノくターン１１、Ｉ
２、Ｉ３が時間の関数の形（電流パターン）で設定され
ている。尚、第２図においてＩＯは設定電流パターン１
１〜■３の共通な最低レベル領域を示す。比較回路１つ
は記憶回路１７内の実負荷データと設定回路１８内の設
定電流パターン１１〜Ｉ３とを論理演算回路１３と協働
で比較演算を行い、予め定められた条件に最も近い一つ
の設定電流パターンが選択され、その選択された設定電
流パターンを論理演算回路１４が自動設定回路２０に自
動設定させるようになっており、このような自動設定は
設定スイッチ２１が手動でオン操作されているときのみ
行われるようになっている。The control circuit 11 is further provided with the following circuits corresponding to the purpose of the present invention. That is, the control circuit 11 is provided with a memory circuit 17, and this memory circuit 17 includes the electric motor 2.
The starting current 11, starting time t1, and steady current 12 shown in FIG. 2 are stored as actual load data based on the main circuit current detection signal detected by the current detection circuit 12 in the test operation state under the actual load state. In this example, this storage is done as a current pattern in which the current level is a function of time. On the other hand, the setting circuit 18 has a plurality of types of setting currents as shown in FIG.
2. I3 is set in the form of a time function (current pattern). In addition, in Fig. 2, IO is set current pattern 1.
The common lowest level areas of 1 to 3 are shown. One comparison circuit compares the actual load data in the memory circuit 17 and the set current patterns 11 to I3 in the setting circuit 18 in collaboration with the logic operation circuit 13, and selects the one closest to the predetermined conditions. A set current pattern is selected, and the logical operation circuit 14 causes the automatic setting circuit 20 to automatically set the selected set current pattern.Such automatic setting is performed when the setting switch 21 is manually turned on. It is designed to be performed only when there are people present.
次ぎに上記構成の作用について説明する。Next, the operation of the above configuration will be explained.
まず、異常判定用基準値を自動設定する作用について説
明する。設定スイッチ２１をオンさせた状態で電動機２
が実負荷状態で最初に運転、即ち例えば試験運転される
と、変流器６、零相変流器６を介して電流検出回路１２
により主回路１に流れた実際の電動機電流に対応した起
動電流１１、定常電流１２および起動時間ｔ１の実負荷
データが検出され、これが電流パターンとして記憶回路
１７に記憶される。この記憶電流パターンは比較回路１
９および論理演算回路１４によって設定回路１８内の設
定電流パターン１１〜Ｉ３と比較演算される。この比較
は同一時間軸上での電流値の大きさについて行われ、例
えばまず最初に設定電流パターン１１と比較され、この
比較の結果、起動電流１１及び定常電流１２からなる電
流パタンの少なくとも一部が設定電流値工１以上を示す
時間領域が存在したとき（第２図ではＩ１がこの状態に
ある）は、次の１２との比較演算に移行され、以下同様
の比較演算が繰り返される。この比較演算で設定電流パ
ターンＩｌ〜■３中、記憶電流パターン以上を最初に示
した設定電流パターン即ち本例ではＩ２が保護条件に最
も近い関係にある異常判定用基準値として自動設定回路
２０に自動的に設定され、以後この異常判定用基準値が
異常判定用に用いられる。First, the function of automatically setting the reference value for abnormality determination will be explained. With the setting switch 21 turned on, the electric motor 2
When it is operated for the first time under an actual load condition, that is, for example, during a test operation, the current detection circuit 12
Actual load data of starting current 11, steady current 12, and starting time t1 corresponding to the actual motor current flowing through main circuit 1 are detected, and this is stored in storage circuit 17 as a current pattern. This memory current pattern is the comparator circuit 1
9 and the logic operation circuit 14, the current patterns are compared with the set current patterns 11 to I3 in the setting circuit 18. This comparison is performed on the magnitude of the current value on the same time axis. For example, first, it is compared with the set current pattern 11, and as a result of this comparison, at least part of the current pattern consisting of the starting current 11 and the steady current 12 is When there exists a time region in which the set current value is greater than or equal to 1 (I1 is in this state in FIG. 2), the next comparison operation with 12 is performed, and the same comparison operation is repeated thereafter. By this comparison calculation, among the set current patterns I1 to 3, the set current pattern that is higher than the stored current pattern, that is, I2 in this example, is set as the reference value for abnormality judgment that has the closest relationship to the protection condition and is set in the automatic setting circuit 20. This reference value for abnormality determination is automatically set, and is subsequently used for abnormality determination.
そして通常の運転状態では、変流器５、零相変流器６か
ら出力された主回路１の検出電流を電流検出回路１２に
より所定の信号に変換し、これを論理演算回路１４が後
述のように自動設定回路２０に自動設定された設定電流
パターン即ち異常判定用基準値或いはその他の種々の基
準値と比較する論理演算を行って過負荷、欠相、地絡等
の異常が無いかどうかを常時監視している。異常を生じ
た場合、論理演算回路１４は駆動回路１３及び表示回路
１５に電磁接触器４の開放動作指令及び異常内容の表示
指令を出力する。Under normal operating conditions, the detected current of the main circuit 1 output from the current transformer 5 and zero-phase current transformer 6 is converted into a predetermined signal by the current detection circuit 12, which is then converted into a predetermined signal by the logic operation circuit 14 as described below. A logical operation is performed to compare the set current pattern automatically set in the automatic setting circuit 20, that is, a reference value for abnormality judgment, or various other reference values to check whether there are any abnormalities such as overload, open phase, or ground fault. is constantly monitored. When an abnormality occurs, the logical operation circuit 14 outputs a command to open the electromagnetic contactor 4 and a command to display the contents of the abnormality to the drive circuit 13 and the display circuit 15.
［発明の効果］
本発明によれば、電動機の運転によって電動機の起動電
流、起動時間および定常電流などの実負荷データが自動
的に得られ、この実負荷データと予め設定されている複
数種の電流パターンとを比較演算して予め定められた条
件に最も近い関係にある電流パターンを自動的選択して
これを異常判定用基準値として自動設定するので、常に
最適な基準値を設定でき、しかもこれを自動的に行ない
得るので設定作業が極めて容易になるなどの優れた効果
を期待できる。[Effects of the Invention] According to the present invention, actual load data such as starting current, starting time, and steady current of the motor can be automatically obtained by operating the electric motor, and this actual load data and multiple types of preset The current pattern that has the closest relationship to the predetermined conditions is automatically selected by comparing and calculating the current pattern, and this is automatically set as the reference value for abnormality judgment, so the optimal reference value can always be set. Since this can be done automatically, excellent effects such as extremely easy setting work can be expected.
第１図は本発明の一実施例を示す回路図、第２図は電動
機電流特性および保護条件である電流特性を示す図であ
る。
図面中、１は主回路、４は電磁接触器、５は変流器（電
流変換器）、６は零相変流器、１１は制御回路、１２は
電流検出回路、１４は論理演算回路、１７は記憶回路、
１８は設定回路、１９は比較回路、２０は自動設定回路
である。
→電流FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing motor current characteristics and current characteristics as protection conditions. In the drawing, 1 is a main circuit, 4 is an electromagnetic contactor, 5 is a current transformer (current converter), 6 is a zero-phase current transformer, 11 is a control circuit, 12 is a current detection circuit, 14 is a logic operation circuit, 17 is a memory circuit;
18 is a setting circuit, 19 is a comparison circuit, and 20 is an automatic setting circuit. →Current
Claims (1)
触器と、主回路電流を検出する電流変換器と、前記電磁
接触器を開閉するための起動および停止操作信号を入力
する入力回路と、前記電流変換器からの検出信号を異常
判定用基準値と比較して異常の有無を判定し異常時に電
磁接触器の開放指令を出力する論理演算回路とからなる
電動機制御装置において、前記電流変換器からの検出信
号から電動機の起動電流、起動時間および定常電流であ
る実負荷データを得これを記憶する記憶回路と、異常判
定基準値として複数種の電流パターンが予め設定されて
いる設定回路と、前記記憶回路に記憶されている実負荷
データと前記設定回路に設定されている複数種の電流パ
ターンと比較し予め定められた条件に最も近い関係にあ
る電流パターンを選択しこれを前記異常判定用基準値と
して設定する自動設定回路とを設けてなる電動機制御装
置。1. An electromagnetic contactor that opens and closes the main circuit between the power bus and the motor, a current converter that detects the main circuit current, and an input circuit that inputs start and stop operation signals to open and close the electromagnetic contactor. A motor control device comprising: a logic operation circuit that compares a detection signal from the current converter with a reference value for abnormality determination to determine the presence or absence of an abnormality and outputs a command to open a magnetic contactor in the event of an abnormality; a memory circuit that obtains and stores actual load data, which is a starting current, starting time, and steady current of the motor from a detection signal from a detection signal; and a setting circuit in which multiple types of current patterns are preset as abnormality determination reference values; The actual load data stored in the storage circuit is compared with multiple types of current patterns set in the setting circuit, and the current pattern that has the closest relationship to predetermined conditions is selected and used for the abnormality determination. A motor control device comprising an automatic setting circuit for setting a reference value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141029A JP2831806B2 (en) | 1990-05-30 | 1990-05-30 | Motor control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2141029A JP2831806B2 (en) | 1990-05-30 | 1990-05-30 | Motor control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0433517A true JPH0433517A (en) | 1992-02-04 |
| JP2831806B2 JP2831806B2 (en) | 1998-12-02 |
Family
ID=15282560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2141029A Expired - Lifetime JP2831806B2 (en) | 1990-05-30 | 1990-05-30 | Motor control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2831806B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101791255B1 (en) * | 2017-03-02 | 2017-10-30 | 주식회사 웰림 | Composite multi function relay system and its control method |
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1990
- 1990-05-30 JP JP2141029A patent/JP2831806B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JP2831806B2 (en) | 1998-12-02 |
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