JPH08116675A - Power converter - Google Patents
Power converterInfo
- Publication number
- JPH08116675A JPH08116675A JP6251116A JP25111694A JPH08116675A JP H08116675 A JPH08116675 A JP H08116675A JP 6251116 A JP6251116 A JP 6251116A JP 25111694 A JP25111694 A JP 25111694A JP H08116675 A JPH08116675 A JP H08116675A
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- Prior art keywords
- main circuit
- failure
- power
- load
- inverter main
- 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.)
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- Power Conversion In General (AREA)
- Inverter Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、半導体素子を主回路ス
イッチング素子とする電力変換装置に係り、特に主回路
の故障復旧対策を施した装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion device having a semiconductor element as a main circuit switching element, and more particularly to a device having a failure recovery measure for the main circuit.
【０００２】[0002]
【従来の技術】インバータやコンバータ等の電力変換装
置は、トランジスタやＧＴＯ等の半導体素子を主回路ス
イッチング素子とし、直流や交流の電力変換を行い、負
荷に電圧や周波数を制御した電力供給を行う。2. Description of the Related Art Power converters such as inverters and converters use semiconductor elements such as transistors and GTOs as main circuit switching elements to convert DC or AC power and supply power to a load with voltage and frequency controlled. .
【０００３】これら電力変換装置は、各種製造システム
やコンピュータシステムに設けられるときは、システム
の多くの箇所に設けられ、システムの重要な電源装置に
なる。When provided in various manufacturing systems or computer systems, these power converters are provided in many places of the system and become an important power supply device of the system.
【０００４】図５は、従来の電圧形インバータ構成例を
示す。交流電源からの入力を整流器１で直流電力に変換
し、これをインバータ主回路２で電圧と周波数を制御し
た交流電力に変換し、誘導電動機等の負荷に供給する。FIG. 5 shows a configuration example of a conventional voltage source inverter. The input from the AC power supply is converted into DC power by the rectifier 1, this is converted into AC power whose voltage and frequency are controlled by the inverter main circuit 2, and is supplied to a load such as an induction motor.
【０００５】インバータ主回路２の制御装置３は、整流
器１の直流出力を制御電源とし、制御部３Ａにより指令
信号に応じたゲート信号を発生し、ドライバ部３Ｂによ
りゲート信号を増幅してインバータ主回路２の各半導体
スイッチのドライブ信号を得る。４は平滑コンデンサ５
の初期充電用電流制限回路、６は過電流保護用のヒュー
ズである。The controller 3 of the inverter main circuit 2 uses the DC output of the rectifier 1 as a control power source, the control unit 3A generates a gate signal according to the command signal, and the driver unit 3B amplifies the gate signal to invert the inverter main circuit. The drive signal of each semiconductor switch of the circuit 2 is obtained. 4 is a smoothing capacitor 5
The current limiting circuit for initial charging of, and 6 are fuses for overcurrent protection.
【０００６】なお、整流器１を電圧制御機能を持つコン
バータとする構成の場合があるし、負荷に制御した直流
電力を供給するにはコンバータから直接に負荷に供給す
る構成やインバータ主回路２に代えてチョッパ主回路を
設ける構成など、要求される仕様に応じて種々の電力変
換装置に構成される。In some cases, the rectifier 1 may be a converter having a voltage control function, and in order to supply the controlled DC power to the load, the converter is directly supplied to the load or the inverter main circuit 2 is used instead. It is configured in various power conversion devices according to required specifications such as a configuration in which a chopper main circuit is provided.
【０００７】[0007]
【発明が解決しようとする課題】従来の電力変換装置に
おいて、装置故障は、主回路の半導体スイッチの故障が
原因となることが多い。コンバータも含めた主回路の故
障には、主回路が制御装置に比べて大形一体型かつ高価
な装置になるため、半導体スイッチなどの回路部品の交
換で対応している。In the conventional power conversion device, the device failure is often caused by the failure of the semiconductor switch of the main circuit. Failure of the main circuit including the converter is dealt with by replacing circuit parts such as semiconductor switches because the main circuit becomes a large-scale integrated type and expensive device compared to the control device.
【０００８】このため、電力変換装置の故障には、装置
運転を一旦停止し、故障部品を交換することになり、長
時間の運転停止になる。Therefore, when the power conversion device fails, the device operation is temporarily stopped and the failed component is replaced, resulting in a long-term operation stop.
【０００９】特に、電力変換装置がシステムの主要電源
として組み込まれる場合にはシステム全体の長時間ダウ
ンになる。In particular, when the power converter is incorporated as the main power source of the system, the whole system is down for a long time.
【００１０】また、電力変換装置がエレベータ用インバ
ータとなる場合には、電力変換装置の故障で乗員をエレ
ベータかご内に閉じ込めてしまう恐れがある。Further, when the power conversion device is an inverter for an elevator, there is a risk that an occupant may be trapped in the elevator car due to a failure of the power conversion device.
【００１１】本発明の目的は、主回路の故障発生にも迅
速な復旧を可能にする電力変換装置を提供することにあ
る。An object of the present invention is to provide a power conversion device which enables quick recovery even if a failure occurs in the main circuit.
【００１２】[0012]
【課題を解決するための手段】本発明は、前記課題の解
決を図るため、半導体スイッチで構成する主回路とその
ドライブ部と制御部を有して負荷に電力を供給する電力
変換装置において、前記主回路は互いに分離構成した２
つの主回路構成としかつ切換スイッチの切り替えで共通
の電源と負荷を切り替える構成とし、前記制御部は前記
ドライブ部を通して前記２つの主回路に同じドライブ信
号を与え、運転中の主回路に故障が検出されたときに前
記切換スイッチを切り替える構成としたことを特徴とす
る。In order to solve the above-mentioned problems, the present invention provides a power conversion device for supplying power to a load, which has a main circuit composed of semiconductor switches, a drive section and a control section thereof, The main circuit is separated from each other 2
One main circuit configuration and a configuration in which a common power source and a load are switched by switching a changeover switch, and the control unit gives the same drive signal to the two main circuits through the drive unit to detect a failure in the operating main circuit. It is characterized in that the changeover switch is changed over when the switch is turned on.
【００１３】[0013]
【作用】装置故障の原因となる確率が高い主回路には予
備の主回路を設けておき、運転中の主回路の故障には迅
速に予備の主回路に切り替えることで装置運転の継続を
可能にする。[Function] A main circuit that has a high probability of causing a device failure is provided with a spare main circuit, and in the event of a main circuit failure during operation, it is possible to quickly switch to the spare main circuit to continue device operation. To
【００１４】また、主回路を互いに分離構成することに
より一方の運転中に故障した主回路の修理・交換を可能
にする。Further, by separating the main circuits from each other, it is possible to repair / replace the main circuit which has failed during one operation.
【００１５】[0015]
【実施例】図１は、本発明の一実施例を示す回路図であ
り、図５と同じものは同一符号で示す。1 is a circuit diagram showing an embodiment of the present invention, and the same elements as those in FIG. 5 are designated by the same reference numerals.
【００１６】インバータ主回路２Ａ、２Ｂは、トランジ
スタやＩＧＢＴ、ＧＴＯなどの半導体スイッチを使った
電圧形インバータ主回路に構成され、それぞれ直流入力
側にヒューズ６Ａ，６Ｂが設けられる。The inverter main circuits 2A and 2B are constructed as voltage-type inverter main circuits using semiconductor switches such as transistors and IGBTs and GTOs, and fuses 6A and 6B are provided on the DC input side, respectively.
【００１７】このうち、インバータ主回路２Ｂは、イン
バータ主回路２Ａの予備用であり、通常時には整流器１
側の直流電源にインバータ主回路２Ａが接続され、イン
バータ主回路２Ａの故障発生時にはインバータ主回路２
Ｂが接続されるよう切換スイッチ１１による切換回路が
設けられる。Of these, the inverter main circuit 2B is a backup of the inverter main circuit 2A, and normally, the rectifier 1 is used.
Inverter main circuit 2A is connected to the DC power supply on the side, and when the inverter main circuit 2A fails, the inverter main circuit 2A
A changeover circuit by the changeover switch 11 is provided so that B is connected.
【００１８】インバータ主回路２Ａ、２Ｂの出力側は、
切換スイッチ１２によって出力を切り替えて負荷に電力
を供給する構成にされる。この切換スイッチ１２は、切
換スイッチ１１の切り替えと連動して切り替え制御され
る。The output sides of the inverter main circuits 2A and 2B are
The output is switched by the changeover switch 12 to supply power to the load. The changeover switch 12 is switch-controlled in conjunction with the changeover of the changeover switch 11.
【００１９】制御装置３は、両インバータ主回路２Ａ、
２Ｂに同じドライブ信号を与え、両インバータ主回路２
Ａ、２Ｂのドライブ信号の位相を同じにしておく。The control device 3 includes both inverter main circuits 2A,
The same drive signal is given to 2B, and both inverter main circuits 2
The phases of the A and 2B drive signals are set to be the same.
【００２０】また、制御装置３は、インバータ主回路２
Ａの故障検出により切換スイッチ１１、１２をインバー
タ主回路２Ｂ側に切り替え、インバータ主回路２Ｂの故
障検出により切換スイッチ１１、１２をインバータ主回
路２Ａ側に切り替える。Further, the control unit 3 includes the inverter main circuit 2
The changeover switches 11 and 12 are switched to the inverter main circuit 2B side by the failure detection of A, and the changeover switches 11 and 12 are switched to the inverter main circuit 2A side by the failure detection of the inverter main circuit 2B.
【００２１】また、インバータ主回路２Ａと２Ｂは、互
いに分離した構成にされ、一方の運転中に他方の修理・
交換を可能にする。Further, the inverter main circuits 2A and 2B are constructed so as to be separated from each other, and one of the inverter main circuits is repaired while the other is operating.
Allows replacement.
【００２２】本実施例によれば、図２に故障発生に対す
る復旧のフローチャートを示すように、インバータ主回
路２Ａが健全な通常時には、切換スイッチ１１、１２が
インバータ主回路２Ａ側に切り替えられており、制御装
置３による制御によってインバータ主回路２Ａから負荷
に電力を供給する。According to the present embodiment, as shown in the flowchart of the recovery from the failure occurrence in FIG. 2, the changeover switches 11 and 12 are switched to the inverter main circuit 2A side when the inverter main circuit 2A is normal. Power is supplied from the inverter main circuit 2A to the load under the control of the control device 3.
【００２３】そして、インバータ主回路２Ａに故障が発
生したときに制御装置３による切換スイッチ１１、１２
の瞬時の切り替えがなされ、インバータ主回路２Ｂによ
る負荷への電力供給がなされ、負荷の運転継続になる。
このとき、インバータ主回路２Ａは故障原因の究明と半
導体スイッチ等の交換・修理がなされる。Then, when a failure occurs in the inverter main circuit 2A, the changeover switches 11, 12 by the control device 3 are provided.
Is instantaneously switched, power is supplied to the load by the inverter main circuit 2B, and the operation of the load is continued.
At this time, the cause of the failure in the inverter main circuit 2A is investigated, and the semiconductor switches and the like are replaced and repaired.
【００２４】同様に、インバータ主回路２Ｂの故障発生
には、インバータ主回路２Ａ側への切り替えがなされ
る。Similarly, when a failure occurs in the inverter main circuit 2B, switching to the inverter main circuit 2A side is performed.
【００２５】この切り替えには、両インバータ主回路２
Ａ、２Ｂを同じ位相・電圧・周波数にした同期化出力に
なり、負荷にトルクショック等を発生することがない。For this switching, both inverter main circuits 2
Synchronized outputs with A, 2B having the same phase, voltage, and frequency are used, and torque shock or the like does not occur in the load.
【００２６】図３は、制御装置３による故障検出回路の
実施例を示す。インバータ主回路２Ａ又は２Ｂの故障状
況は、多くは各相の上下アームが短絡することになる。
そこで、本実施例では、何れの相の短絡故障にも過大な
直流電流が発生することを利用し、インバータ主回路の
直流側電流から故障を検出する。FIG. 3 shows an embodiment of a failure detection circuit by the control device 3. In the failure condition of the inverter main circuit 2A or 2B, the upper and lower arms of each phase are short-circuited in most cases.
Therefore, in the present embodiment, the fact that an excessive DC current is generated in a short circuit failure in any phase is used to detect the failure from the DC side current of the inverter main circuit.
【００２７】このための故障検出回路は、インバータ主
回路に直列のヒューズ６Ａ（または６Ｂ）に警報ヒュー
ズとマイクロスイッチで構成する警報接点１３を設け、
この接点信号をフォトカプラ１４で絶縁して故障検出信
号として取り出し、制御装置３に与える。The failure detection circuit for this purpose is provided with an alarm contact 13 composed of an alarm fuse and a microswitch in a fuse 6A (or 6B) in series with the inverter main circuit,
The contact signal is insulated by the photocoupler 14 to be taken out as a failure detection signal and given to the control device 3.
【００２８】なお、インバータ主回路の故障としては出
力の欠相の場合があり、この故障検出には出力側の各相
電流の検出によってなされる。The failure of the main inverter circuit may be a phase loss of the output, and the failure is detected by detecting the phase currents on the output side.
【００２９】これら故障検出手段の検出信号は、論理和
演算によって制御装置３に取り込まれ、何れか１つの故
障検出によりインバータ主回路の切り替えがなされる。The detection signals of these failure detecting means are taken into the control device 3 by logical OR operation, and the inverter main circuit is switched by detecting any one failure.
【００３０】図４は、本発明の他の実施例を示す。図１
の実施例ではドライバ部をインバータ主回路２Ａ、２Ｂ
の共通のものとして制御装置３に設けるが、本実施例で
はドライバ部２ＡD，２ＢDをインバータ主回路２Ａ、２
Ｂにそれぞれ専用のものとして設ける。FIG. 4 shows another embodiment of the present invention. FIG.
In the embodiment of the present invention, the driver unit is the inverter main circuit 2A, 2B.
In the present embodiment, the driver units 2A D and 2B D are connected to the inverter main circuits 2A and 2A.
It is provided for each B.
【００３１】これにより、制御部３Ａは、共通のゲート
信号をドライバ部２ＡD，２ＢDに与え、インバータ主回
路２Ａ、２Ｂを専用のドライバ部によりドライブする。
また、ドライバ部２ＡD，２ＢDの電源はそれぞれ切換ス
イッチ１１を通して与える。As a result, the control unit 3A gives a common gate signal to the driver units 2A D and 2B D, and drives the inverter main circuits 2A and 2B by a dedicated driver unit.
The power supplies of the driver units 2A D and 2B D are supplied through the changeover switch 11, respectively.
【００３２】本実施例では、ドライバ部をインバータ主
回路２Ａ、２Ｂの専用のものとするため、ドライバ部２
ＡD，２ＢDの故障に対しても故障復旧を可能にする。こ
のときの故障検出手段は他の実施例と同じで良いし、ド
ライバ部に専用のものを設けても良い。In this embodiment, since the driver section is dedicated to the inverter main circuits 2A and 2B, the driver section 2
A D, to enable fault recovery against the failure of 2B D. The failure detection means at this time may be the same as in the other embodiments, or a dedicated driver section may be provided.
【００３３】[0033]
【発明の効果】以上のとおり、本発明によれば、主回路
は互いに分離構成した２つの主回路構成としかつ切換ス
イッチの切り替えで共通の電源と負荷を切り替える構成
とし、制御部はドライブ部を通して２つの主回路に同じ
ドライブ信号を与え、運転中の主回路に故障が検出され
たときに切換スイッチを切り替える構成としたため、装
置故障の原因となる確率が高い主回路の故障には迅速に
予備の主回路に切り替えることができ、装置運転の継続
を可能にする。As described above, according to the present invention, the main circuit has two main circuit configurations separated from each other, and the common power source and the load are switched by switching the changeover switch, and the control unit passes through the drive unit. The same drive signal is applied to the two main circuits, and the changeover switch is switched when a failure is detected in the operating main circuit. It is possible to switch to the main circuit of and to continue the operation of the equipment.
【００３４】また、主回路を分離構成するため、一方の
主回路による運転中に故障した主回路の修理・交換が可
能となる。Further, since the main circuit is constructed separately, it is possible to repair / replace the main circuit that has failed during operation by one of the main circuits.
【００３５】特に、生産システムやエレベータの電源装
置として組み込まれる場合には、システムダウンや乗員
閉じ込めの防止に効果的となる。Particularly, when it is incorporated as a power supply device for a production system or an elevator, it is effective in preventing the system from going down and occupant confinement.
【図１】本発明の一実施例を示す構成図。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
【図２】実施例のフローチャート。FIG. 2 is a flowchart of an embodiment.
【図３】本発明の他の実施例を示す故障検出回路。FIG. 3 is a fault detection circuit showing another embodiment of the present invention.
【図４】本発明の他の実施例を示す構成図。FIG. 4 is a configuration diagram showing another embodiment of the present invention.
【図５】従来のインバータ構成例。FIG. 5 shows a conventional inverter configuration example.
２、２Ａ、２Ｂ…インバータ主回路 ３…制御装置 ６、６Ａ、６Ｂ…ヒューズ １１、１２…切換スイッチ 2, 2A, 2B ... Inverter main circuit 3 ... Control device 6, 6A, 6B ... Fuse 11, 12 ... Changeover switch
Claims (1)
ドライブ部と制御部を有して負荷に電力を供給する電力
変換装置において、 前記主回路は互いに分離構成した２つの主回路構成とし
かつ切換スイッチの切り替えで共通の電源と負荷を切り
替える構成とし、 前記制御部は前記ドライブ部を通して前記２つの主回路
に同じドライブ信号を与え、運転中の主回路に故障が検
出されたときに前記切換スイッチを切り替える構成とし
たことを特徴とする電力変換装置。1. A power converter having a main circuit composed of semiconductor switches, a drive section thereof, and a control section for supplying electric power to a load, wherein the main circuit has two main circuit configurations separated from each other and is switched. A common power source and a load are switched by switching a switch, and the control unit gives the same drive signal to the two main circuits through the drive unit, and the changeover switch is used when a failure is detected in the main circuit during operation. A power conversion device having a configuration for switching between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6251116A JPH08116675A (en) | 1994-10-18 | 1994-10-18 | Power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6251116A JPH08116675A (en) | 1994-10-18 | 1994-10-18 | Power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08116675A true JPH08116675A (en) | 1996-05-07 |
Family
ID=17217899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6251116A Pending JPH08116675A (en) | 1994-10-18 | 1994-10-18 | Power converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08116675A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1191605A (en) * | 1997-09-19 | 1999-04-06 | Honda Motor Co Ltd | Electric motor driving device |
| JPH1198888A (en) * | 1997-09-16 | 1999-04-09 | Honda Motor Co Ltd | Motor driver |
| KR20000060772A (en) * | 1999-03-19 | 2000-10-16 | 이건수 | serial/parallel connection type converter circuit |
| JP2005287129A (en) * | 2004-03-29 | 2005-10-13 | Toshiba Corp | Standby type power supply apparatus |
| JP2007288997A (en) * | 2007-08-06 | 2007-11-01 | Toshiba Corp | Standby power supply unit |
| JP2007336749A (en) * | 2006-06-16 | 2007-12-27 | Toshiba Corp | Power supply for electric vehicle |
| US7906933B2 (en) | 2006-06-22 | 2011-03-15 | Hitachi, Ltd. | Apparatus and method for driving an induction motor |
| JP2011193589A (en) * | 2010-03-12 | 2011-09-29 | Fuji Electric Co Ltd | Power converter |
| JP2013534803A (en) * | 2010-07-07 | 2013-09-05 | インスチチュート ナショナル ポリテクニク デ トゥールーズ | A novel redundant structure for static converter circuits. |
| JP2015027255A (en) * | 2013-07-26 | 2015-02-05 | サムソン エレクトロ−メカニックス カンパニーリミテッド． | Parallel structure power device and control method therefor |
| WO2015129311A1 (en) * | 2014-02-25 | 2015-09-03 | 日立オートモティブシステムズ株式会社 | Motor control system and motor control method |
| EP3116096A4 (en) * | 2014-03-04 | 2017-11-22 | Eaton Corporation | Ups circuit |
| KR20180065041A (en) * | 2016-12-06 | 2018-06-18 | 우리산업 주식회사 | an motor variable driving system with unbalanced current correction of the hybrid electric ship for zero emission zone and the method thereof |
| KR20180065040A (en) * | 2016-12-06 | 2018-06-18 | 우리산업 주식회사 | A high efficient variable driving system of the hybrid electric ship for zero emission zone and the method thereof |
| JP2019206435A (en) * | 2018-05-30 | 2019-12-05 | 株式会社日立ビルシステム | Drive control system for elevator |
-
1994
- 1994-10-18 JP JP6251116A patent/JPH08116675A/en active Pending
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| JPH1198888A (en) * | 1997-09-16 | 1999-04-09 | Honda Motor Co Ltd | Motor driver |
| JPH1191605A (en) * | 1997-09-19 | 1999-04-06 | Honda Motor Co Ltd | Electric motor driving device |
| KR20000060772A (en) * | 1999-03-19 | 2000-10-16 | 이건수 | serial/parallel connection type converter circuit |
| JP2005287129A (en) * | 2004-03-29 | 2005-10-13 | Toshiba Corp | Standby type power supply apparatus |
| JP2007336749A (en) * | 2006-06-16 | 2007-12-27 | Toshiba Corp | Power supply for electric vehicle |
| US7906933B2 (en) | 2006-06-22 | 2011-03-15 | Hitachi, Ltd. | Apparatus and method for driving an induction motor |
| JP2007288997A (en) * | 2007-08-06 | 2007-11-01 | Toshiba Corp | Standby power supply unit |
| JP2011193589A (en) * | 2010-03-12 | 2011-09-29 | Fuji Electric Co Ltd | Power converter |
| JP2013534803A (en) * | 2010-07-07 | 2013-09-05 | インスチチュート ナショナル ポリテクニク デ トゥールーズ | A novel redundant structure for static converter circuits. |
| CN104348401A (en) * | 2013-07-26 | 2015-02-11 | 三星电机株式会社 | Parallel structure power apparatus and control method thereof |
| JP2015027255A (en) * | 2013-07-26 | 2015-02-05 | サムソン エレクトロ−メカニックス カンパニーリミテッド． | Parallel structure power device and control method therefor |
| WO2015129311A1 (en) * | 2014-02-25 | 2015-09-03 | 日立オートモティブシステムズ株式会社 | Motor control system and motor control method |
| CN105993125A (en) * | 2014-02-25 | 2016-10-05 | 日立汽车系统株式会社 | Motor control system and motor control method |
| JPWO2015129311A1 (en) * | 2014-02-25 | 2017-03-30 | 日立オートモティブシステムズ株式会社 | Motor control system and motor control method |
| US10185315B2 (en) | 2014-02-25 | 2019-01-22 | Hitachi Automotive Systems, Ltd. | Motor control system and motor control method |
| CN105993125B (en) * | 2014-02-25 | 2019-07-23 | 日立汽车系统株式会社 | Motor control system and motor control method |
| EP3116096A4 (en) * | 2014-03-04 | 2017-11-22 | Eaton Corporation | Ups circuit |
| US10536030B2 (en) | 2014-03-04 | 2020-01-14 | Eaton Intelligent Power Limited | UPS circuit |
| KR20180065041A (en) * | 2016-12-06 | 2018-06-18 | 우리산업 주식회사 | an motor variable driving system with unbalanced current correction of the hybrid electric ship for zero emission zone and the method thereof |
| KR20180065040A (en) * | 2016-12-06 | 2018-06-18 | 우리산업 주식회사 | A high efficient variable driving system of the hybrid electric ship for zero emission zone and the method thereof |
| JP2019206435A (en) * | 2018-05-30 | 2019-12-05 | 株式会社日立ビルシステム | Drive control system for elevator |
| CN110550510A (en) * | 2018-05-30 | 2019-12-10 | 株式会社日立大厦系统 | Drive control system for elevator |
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