SU1599959A1 - Device for controlling reversible electric motor - Google Patents

Abstract

The invention relates to electrical engineering and can be used in electric drives of hoisting-and-transport mechanisms. The aim of the invention is to expand the scope of use by providing an automatic stop at intermediate positions. The device contains a contactor 1 with contacts 2, 3, 14 and a contactor 4 with contacts 5, 6, 15, a relay 10 with contacts 11, 13, a limit switch with contacts 9, 12, buttons 7, 8 “Start forward” and “Start back” ". The limit switch is located on the working tool and interacts with stationary pressure devices, which allows automatic shutdown of the working body of the electric drive in intermediate positions. 1 il.

Description

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The invention relates to electrical engineering and can be used in electric drives of lifting and transporting mechanisms.

The purpose of the invention is to expand the scope of use by providing the ability to stop at intermediate positions.

The drawing shows a diagram of the device.

The device contains the first contactor with the cat 1, the closing contact 2 and the opening contact 3, the second contactor with the coil 4, the closing contact 5 and the disconnecting contact 6, one terminals of the coils t and 4 contactors are combined and provided with a first terminal for connection to the mains, The other terminals of coils 1 and 4 of the contactors are connected via disconnecting contacts 6 and 3 of opposite contactors respectively to one of the heads of buttons 7 and 8, Start forward and Start reverse, shunted by closing contacts 2 and 5 of the first and second contacts ov, another output of button 8 start back through the first disconnecting contact 9 of the circuit breaker is provided with a second terminal for connecting to the mains, one output of coil 10 of the intermediate relay is connected to one terminal of coil 1 and 4 contactors, the other terminal of button 7 starting forward is connected to another by pushing the button 8 Starting back, for the first time the contact 9 of the control switch is shunted by the disconnecting contact 11 of the intermediate relay, another output of the coil 10 of the intermediate relay is connected to one of the outputs of the second disconnecting contact 12 the first switch and the switching contact 13 of the intermediate relay, the other terminals of which are combined in parallel and in a second soedi- .nennye closing contacts 14 .and 15 are connected to a second contactor zazhi IOM for connection to the mains.

The device works as follows

Before the start of the movement, the limit switch located on the working body of the electric drive is in the depressed state and its contacts 9 and 12 are open, the intermediate relay coil is current free, and the contact 11 of the intermediate relay is closed. When you press one of the buttons 7 or 8, cathops 1 or 1-g 4 correspond to a clear contactor.

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With the beginning of the movement, the limit switch is released, its contact 9 whispers contact 11 of the intermediate relay, and the second contact 12 of the limit switch when one of the cycles of the 14 or 15 contactors is turned on turns on the coil 10 of the intermediate relay contact 13 of the intermediate relay shunts contact 12 of the main switch, contact 11 the intermediate relay is opened and the coil of the corresponding contactor remains switched on only through the disconnecting contact 9 of the limit switch. The working device moves with a limit switch for one interval. When the limit switch is hit on the pressure device, its contacts 9 and 12 open, the coil 1 or 4 of the corresponding contactor is de-energized, contact 14 or 15 is open and the coil 10 of the intermediate relay de-energizes, contact 11 which closes, preparing again the motor starting circuit in either direction.

Claims (1)

Invention Formula A device for controlling a reversible electric motor, containing two contactors with a coil, closing circuit; open each contact, one contactors coil pins are combined .and are equipped with a first terminal for connection to the mains, the other terminals of the coils of the contactors are connected via the first open contacts of the opposite contactor respectively to one pin of the Forward and Back start buttons, shunted by the normally open contactors, another pin of the button. Back through the first the breaker contact is provided with a second terminal for connection to the supply network, characterized in that, in order to expand the field of application by providing automatic stop in intermediate positions, an intermediate relay with a coil is inserted into it, zag-1b cabbage 1m and opening contacts, contactors are equipped with second closing contacts, a limit switch equipped with a second opening contact, one output of the intermediate relay coil: connected to one terminals contactor coils, another button output 51599959 The forward start is connected to another end of the contact switch and the lock of the start back button, the first breaker of the intermediate relay. The contact switch of the trip switch OTHERS of which are connected and bridged by opening a contact through a parallel connected second intermediate relay, another output of the coil closing contacts of the contactors of the intermediate relay is connected to the second terminal of the second disconnecting cable from the second disconnecting to the mains .