Gradual control insured against continuation of march with and without automatic starting for electric drives. (Machine-translation by Google Translate, not legally binding)

摘要

"Step-by-step safety control against continuous operation with and without automatic start for electric drives", especially for transformer stepped contact switches, consisting of two motor contactors for forward and reverse operation, as well as at least one other contactor for the gradual control, characterized, because the contactor for the gradual control is equipped with an opener and a closer, as well as with two openers and two closers whose contacts, however, overlap transitorily, and because this contactor is connected through a switch mechanically driven through a cam by the drive and which, in addition to a known closer, has an opener where both contacts, which overlap transiently, are closed passageway so that the contactor of the connected motor in each case remains connected free of interruptions through a branch of the current circuit of the gradual switch contactor p For, in an undisturbed service, fall shortly before the end of the connection stage by opening the mechanically operated contact, in disturbed service, however, eg. when a contactor of the motor is stuck, the remote trip coil of a protective switch of the provided motor, from a phase of the drive motor, and the closed mechanical actuation contacts upon completion of a connection stage as well as the closed contact, receive voltage. , whereas, in case the contactor is not attracted, the remote trip coil of the motor protective switch acts upon receiving voltage through a current circuit, which is parallel to the gradual connection contactor in which it is connected. find a delayed action member, which allows the passage of current when it receives pulses of longer duration, eg. a hot conductor, and the opener, stopping very quickly the motor drive, so that it is impossible to continue driving by the motor. (Machine-translation by Google Translate, not legally binding)