SU1458268A1 - Device for controlling a.c. switch point drive - Google Patents

Abstract

The invention relates to railway automatics devices and can be applied to control a hand-wheel drive. The purpose of the invention is to increase reliability. This goal is achieved by the fact that the front contact of a combined start relay connected in series and the front contacts of the positive and negative arrow buttons, respectively, connected to the reverse and forward switching contacts of the combined start relay, are connected in series with the neutral starting relay. 1 il.

Description

The invention relates to railway automatics devices and can be applied to control an analog electric drive.

The purpose of the invention is to increase reliability.

The drawing shows the block diagram of the proposed device;

The device contains a two-winding combined start-up relay 1 connected to the power source with contacts 1.1-1.17, through a positive button 2 with contacts 2.1-2.3 and a negative button 3 with contacts 3.1-3.3, a neutral starting relay 4 with contacts 4.1-4.6, optocouplers 5 and 6, the photoresistors of which are connected to the start of one and the other windings of relay 1 and one of the outputs of the phase control unit 7, the other code of which is connected to the ends of the windings of relay 1, the third, fourth and fifth outputs of the block (L

ka 7 are connected via contacts of relay 1 to the input of a block of 8 contactless elements with a winding 9 of a transformer, the outputs of block 8 are connected via contacts of a relay 1 to an electric motor 10 of a drive, one of the terminals of a transformer 9 is connected via pin 4.1 of a relay 4 to an auxiliary output of the secondary winding of a transformer 11, other outputs of which through positive control relay 12 with contact 12.1 and negative control relay 13 with contact 13.1 are connected to pins 14 and 15 of the autoswitch, to pins 16 and 17 of which an additional winding plug t is connected the transformer 11 through contact 4.5, and between contacts 14 and 15 a diode 18 is turned on, parallel to relay 12 is connected the cut of 1-stator 19 and capacitor 20, parallel to relay 13 a resistor 21 and capacitor 22 are connected, another terminal of trans4 winding

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formatter 9 is connected through contacts 1.10, 1.11 and 12.1 to one of the terminals of the secondary winding of the transformer 11, and through contacts 1.10, 1.12 and 13.1 to the other terminal of the secondary winding of the transformer 11.

The device works as follows: ipasoM.

To switch the arrow to the minus position, close contact 3.1 is the arrow button 3. This triggers the combined start relay 1 along the following circuit: own contacts 1.1 and 1.2, contact 3.1 of the arrow button 3, contact 2.2 of the arrow button 2, the lower winding and contact 4.6 neutral relay 4. A combined relay with switching contacts 1.6 and 1.9 changes the phase sequence at the input of block B, contact 1.12 prepares the power supply circuit of the transformer 9, and switching contact 1.3 prepares the excitation circuit of the neutral of the relay 4 and the photocoupler 6, further trailing kontaktami- 1.14 and 1.15 sta- 1tornuyu connects motor winding 23 to the output unit 8 noncontact elements and contact. 1.13 closes the circuit | power supply of the neutral relay 4 and the optron 6. Neutral relay 4 contact: 4.6 opens the original power circuit of the combined relay 1, and contact 4.1 connects the primary winding of the control transformer 9 to the secondary winding of the transformer 11. Contactless elements (not shown) are opened, and in the operating circuit - I current flows through the stator winding. At the same time, contacts 14 and 16 of the auto-switch open the supply circuit of the positive polar-sensitive relay 12. In the process of switching the arrows, the blocking voltage from the phase-controlled unit 7 is fed to the lower winding of the combined relay 1, i.e. to the winding through which the initial excitation circuit was formed, which is an essential condition for the normal operation of the starter circuit. At the end of the switch, the arrows close the contacts 15 and 17 of the autoswitch and, through diode 18, the power supply circuit of the negative polarity control relay 13 is formed, which is energized and contact 13.1 opens the power supply circuit of the transformer primary winding 9, the contactless elements of the unit 8 are closed, and the current in the working circuit disappears, then the blocking voltage from the relay 1 is removed, which contacts 1.16 and 1.17 open a de-energized operating circuit .. If during the translation process the need arises to return

the arrows to the initial position, then after acting on the plus arrow button 2 by the contact 2.3, the power supply circuit of the neutral relay 4 is opened, and the contact 2.1 is prepared

the power supply circuit of the upper winding of the combined relay 1 through its switching contact 1.3, however, no current flows through this winding, since the circuit is open by contact 4..2

neutral relay 4, which, after de-energizing by contact 4.2, opens the transformer 9 power supply circuit, and contacts 4.6 closes the power supply circuit of the upper winding of the combined relay 1, which, by contacts 1.5 and 1.8, changes the phase sequence in the current de-energized by the contactless elements of the block 8 circuit, contact 1.3 closes the input circuit of the optocoupler 6, which

closes, and contact 1.2 closes

The input circuit of the optocoupler 5 and prepares the excitation circuit of the neutral-relay 4. After closing the contacts 1.13, 114 and 1.15, the power supply circuits of the neutral relay 4 and the electric motor 10 are formed. Neutral relay 4 with contact 4.1 turns on the block of 8 contactless elements, current flows in the working circuit and the arrow begins to reverse. In the process of transferring the arrow, the blocking voltage from the phase-monitoring unit 7 is now applied to the top winding of the combined relay 1 through the opened optocoupler 5.

Claims (1)

Invention Formula A device for controlling an AC drive containing a combined and neutral starting relays, the first of which is connected to one of the outputs of the phase-monitored unit, and connected in series to the power supply circuit of the neutral starting relay are one connected rear contact of one and a front contact of another arrow buttons, an isolating transformer, one of the outputs of the winding of which is connected to one of the terminals of the windings of one control relay and the matching. a transformer through a direct switching contact of a polarized start relay, and the other output with a winding of another control relay, and a power source, which is so equipped with optocouplers, the photoresistors of one and the other connected between another output of the phase-monitoring unit and, respectively, one and the other windings of the combined start relay, the other direct and reverse switching contacts of which are connected respectively to the front contacts one and another arrow buttons and to the anodes of the diodes of the first and second optocouplers, the cathodes of which are connected to one of the windings of the neutral starting relay, are connected to the power circuit of the front contact, the combined relay, the winding of the isolation transformer is made with an additional output connected through the front contact of the neutral the starting relay to one of the winding terminals of the matching transformer, between the first winding terminal of the isolation transformer and the first direct switching contact of the combined USKOVA relay included tg- lovoy one contact of the control relay, and between the first switching contact reflux combined starter relay and the other terminal of the winding of the isolation transformer included a rear contact of another relay control. J "