SU65638A1 - Device for remote control of the magnetic starter - Google Patents

Description

The present invention relates to devices for remote control of a magnetic starter of an induction motor over three operating (phase) and grounding wires connecting the starter to the motor. Near the engine there is a control post with start and stop buttons, of which the first serves for remote activation via a grounding conductor located in the low voltage intermediate relay starter. The latter is connected between the working residential and the ground and serves to turn on the coil of the power contactor.

The essence of the invention is that a single-pole contactor is installed at the control station, in which the power contact serves to close one of the phase conductors and the winding is turned on via the stop button to the line voltage of the motor. The start button is connected between the specified 1m wire and the grounding conductor, and the intermediate relay of the magnetic starter is made with contacts briefly switched on only when the intermediate relay returns to its original position

after turning it off with the power contact of the power contactor.

To prevent the control circuit from being re-closed with the start button, the contacts of the latter are automatically lowered inside the push button box after the single-pole contactor is triggered. In order to increase the reliability of operation, the winding of a single-pole contactor can be divided into two series-connected sections, between which the stop button is turned on. The invention is illustrated in the drawing, which shows the electrical circuit of the device. Here we have the following notation: K - three-pole contactor with

including coil QC, Tr - voltage transformer

380/24 or 220/24 c. PT-thermal relays with common normally closed contact 29-SO.

RP - intermediate relay for 24 V with special delayed action contact 23-24. PB - off relay with normally open contact 31-32.

A push button post consists of two conventional button elements, one of which is connected to a LO long-range contactor located in the same chamber.

Motor control is performed in the following sequence.

When the start button is pressed, a day is formed 7-8-9-} 0-11-12. Tr-1-2pn-3-4-5-6-Cz-7 and the intermediate RP relay is turned on, the relay core is drawn in but closed pins 23-24 ne occurs.

After the return of the start button to the initial power source, the RPN relay coil chain is broken, the relay core drops out and the contacts close .25-24. For the time required for a full start. With the closure of the hoptakts 23-24, a chain of 23-24-25-KK-26-27-Lz is formed and the KK KjHTaKTOpa coil is energized, its core is pulled in, opens contacts 5-4 and locks the working contacts K. At the same time, all three working tires C C-2, Sz are under voltage, the coil of a single-pole KO contactor is powered by an L-C-13-14-15-1617-18-19-C2-L-2 circuit, the contactor operates and closes contact 20-2L The motor pacifica works by receiving power from the linear clamps Li L-2, LzPending in supplying voltage to the motor on the third phase, according to the experiments of the inventor minutes, numbered in hundredths of a second fraction x n has no practical significance.

After turning on the engine, the RV relay will turn on, which will lock its contacts 31-32, due to which the contactor coil -KK receives power through the L circuit. 28-29-30-3} -32-33-25-26-27-Лг .

One time relay RP comes at the initial position, opening contacts 23-24.

When the operating voltage of the Copta-Kty launch pad is drawn inward, the chamber becomes inaccessible to the secondary start button with the start button until the electric motor is stopped.

When the button is pressed, the stop contactor KO interrupts the worker phase C3. The power supply of the coil of the RV relay stops, as a result of which it opens the coils 31-32 in 1spi of the power supply to the coil of the contactors. The working contacts / open and the motor o become.

The intermediate RP relay, used in this device, is equipped with one set of spring contacts, which do not snap when the core is pulled in, since they have an insulation on one side. In the course of direct travel, the co-contacts pass the bridge, the passage of the pin to the heart. When a core falls out, the bridge closes the contacts and for some time (according to the authors up to 0.06 sec.) Sk; 1bits along them.

The main advantage of the proposed device is that the remote control of the starter is carried out but to the working wires without the use of any control wires.

Subject invention

Claims (3)

1. A device for remote control of an asynchronous motor magnet starter for three working (phase) and grounding veins connecting the starter with the engine, near which the control post with the start and table buttons is located, from which the first serves as remote switching ON the grounding located in the starter Vizkovolt intermediate relay connected between the p-workroom and the vemle and intended to turn on the coil of the power contactor, characterized in that A large contactor, in which the power contact serves to close one of the phase conductors and the winding is connected via the stop button to the linear voltage of the motor, while the start button is connected between the specified phase conductor and the grounding conductor, and the intermediate relay of the magnetic starter is discharged, : Stitched with contacts, briefly included only on return the intermediate relay to its original position after turning off its block contacts of the power contactor. 2. The form of the FULFILLMENT of the device according to claim 1, characterized in that the contacts of the start button are automatically lowered inside the push button box after the single-pole operation a contactor, to prevent the re-closing of the control box with the start button. 3. The form of the device according to in. 1, characterized in that the winding of the single-pole Contactor is divided into two sections connected in series, between which the stop button is turned on. WITH. "1SC  15815I .P1.; -; bg; elb1 nycF dTion