CONTROL CIRCUIT FOR ELEVATOR

PURPOSE:To protect a three-phase converter from a lightning surge by connecting a bypass capacitor between positive and negative poles of the three- phase converter. CONSTITUTION:When high surge voltage is applied between a power supply and the ground, in the case of an elevator in running, a charge...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HIRATA AKIRA, TAKAHASHI HIDEAKI, ISHIMOTO SHIGERU, AOKI KAZUMITSU
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY ELEVATORS ESCALATORS OR MOVING WALKWAYS GENERATION HAULING HOISTING LIFTING PERFORMING OPERATIONS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To protect a three-phase converter from a lightning surge by connecting a bypass capacitor between positive and negative poles of the three- phase converter. CONSTITUTION:When high surge voltage is applied between a power supply and the ground, in the case of an elevator in running, a charge current is allowed to flow in a stray capacity between fuse free breaker FFB-3-phase converter COV-main contact 10T1 of running contactor-smoothing capacitor FiL.C- main circuit-ground. Accordingly, both end voltage of the 3-phase converter COV is prevented from rising. In the case of the elevator in stopping, a charge current is allowed to flow in a stray capacity between fuse free breaker FFB-3- phase converter COV-bypass capacitor C-main circuit-ground. Accordingly, both end voltage of the 3-phase converter COV is prevented from increasing. In this way, the 3-phase converter COV can be protected from a lightning surge.