RU174823U1 - ELECTRICAL WIRING DIAGRAM OF THE MAIN CRANE CONTACTOR - Google Patents

Abstract

The utility model relates to electrical transmission of control pulses and can be used, in particular, to turn on the main contactor of railway cranes. The task is to simplify the circuit of the device while increasing its reliability. The main contactor switching circuit includes a voltage transformer 1 connected through a circuit breaker 2 in parallel with a contactor switching control lamp 3, which is connected in series with its switch 4 and in parallel with a circuit of the first chain in series from each other of the contactor switch 5 button, lockout element 6 doors to the equipment room, self-propelled control controller 7, load lifting control controller 8, boom control controller 9, and a second chain of thermal le 10 and relay 11 undervoltage. At the same time, a relay switch 12 is connected between it and the control lamp 3 in parallel, connected by one contact to the connection point of the two chains, and the second contact with the contactor on button 13 connected by the second contact to the contactor off button 5. The second output of the transformer 1, the switch contact 4, contacts 14 and 15 of the relay 11 of the minimum voltage are grounded. Introduction to the circuit of a separate relay switch in conjunction with a circuit connection from the controllers for controlling the operation of the main crane nodes and a circuit ensuring their switching on and off in one serial circuit with a circuit breaker between the transformer and the rest of the circuit with the above-described connection of the circuit elements of the main crane contactor enables significantly to simplify this circuit by excluding the electric motor from the circuit and retaining the functions of manual switching on and automatic switching off, which There is an opportunity to increase the reliability of its work. 1 ill.

Description

The utility model relates to electrical transmission of control pulses and can be used, in particular, to turn on the main contactor of railway cranes.

The closest in technical essence to the claimed one is the electrical circuit for switching on the main contactor of the EBC crane, presented in the book of I.P. Tomilin and Novikova G.I. “EBC cranes. The device and operation "Moscow, 2000, pp. 84, 85, fig. 45, and selected as a prototype, (see. Appendix to the application).

The German-made main switch (GGA-30802), operated on cranes of the EBC type, has a number of serious drawbacks, because of which its service life is limited and, not least, has frequent failures during the crane operation. Because of this, operating personnel often install non-standard bypass circuits. This is due to the following.

The known main switch contactor circuit includes an electric motor M, which enables the main contactor to be switched on, which supplies power to the fixed contacts of contactors and circuit breakers and to a control transformer through power contacts.

One stator winding of the electric motor M is connected through a resistor and terminal 82 of the Oa2 switch to the first chain of series-connected 4v1 boom lift controller, 1v1 load lifting controller, self-propelled lock element (6v4), hardware door lock element Ov0, contactor enable buttons (Ov20), and in parallel - through the resistor and terminal 84 of the switch 83-84 with the off button of the contactor Ov6.

Another stator winding of the electric motor M is connected through the lighting transformer Ot6 and the contact of the switch 6-5 Оа2 with the signal lamp Oh 01 of the control switch on the contactor and in parallel with the second chain of series-connected undervoltage relays (U <), thermal relay (contacts 51-52 Оа2 ), the “work-control” switch (Ov5), the off button of the contactor (contacts 1-2 Ov6).

The electric motor here functions as a manual on and off unit.

The operation of the circuit is as follows (see page 84).

. Электродвигатель обеспечивает включение Оа2 который через силовые контакты подает питание на неподвижные контакты контакторов и автоматических выключателей и на трансформатор управления От3. Кроме этого, размыкаются контакты 81=82 Оа2 и замыкаются контакты 83=84 и 93=94 Оа2. Получает питание реле минимального напряжения:

- обмотка реле и

. Реле механической защелкой удерживает Оа2 во включенном положении, а контактом 83=84 Оа2 подготовлена цепь выключения М. При понижении напряжения реле выключится, обесточит М, который выключит Оа2. Последний также выключается при срабатывании теплового реле размыканием 51=52 Оа2. Контрольная лампа Oh01 загорится при срабатывании Оа2 в результате замыкания 5=6 Оа2.Inclusion. Before pressing the Ov20 button to turn on the contactor, all controllers are set to "0" and close the door of the control room. When the Ov20 button is pressed, an M motor circuit is created:

. The electric motor provides the inclusion of Oa2 which, through power contacts, supplies power to the fixed contacts of the contactors and circuit breakers and to the Ot3 control transformer. In addition, contacts 81 = 82 Oa2 are opened and contacts 83 = 84 and 93 = 94 Oa2 are closed. It receives power undervoltage relay:

- relay coil and

. The relay holds Oa2 in the on position by a mechanical latch, and the contact circuit M is prepared by contact 83 = 84 Oa2. When the voltage is reduced, the relay will turn off, disconnect M, which will turn off Oa2. The latter also turns off when the thermal relay is tripped by opening 51 = 52 Oa2. The control lamp Oh01 will turn on when Oa2 is triggered as a result of short circuit 5 = 6 Oa2.

. В этот же момент отключается цепь питания реле минимального напряжения.Shutdown. When Ov6 is pressed, contacts 3 = 4 Ov6 are closed and a power supply circuit M is created through the second stator winding:

. At the same time, the undervoltage relay power circuit is disconnected.

The connection diagram turns out to be too complicated and not very reliable, especially since a single-phase motor often fails due to frequent starts. The arcing system in case of short circuits does not cope with the electric arc, due to which the circuit breaker itself burns out.

The goal is to simplify the circuit of the device while increasing its reliability.

The problem is solved in that in the electrical circuit for switching on the main contactor of the crane, which includes a voltage transformer connected to a manual on and off unit, one output of which is connected to the first chain of series-connected door blocking elements to the control room, self-propelled controller, controller load control, boom control controller and is connected to the power button of the contactor, and the second output is connected to the second chain of series-connected re e of the minimum voltage, thermal relay, and the contactor’s turn-off button, connected between the voltage transformer and the first circuit in parallel with them, a contactor’s on-off control lamp, connected in series with its turn-on button, ACCORDING TO THE USEFUL MODEL, the first circuit on the side of the door blocking element is connected to the contactor’s turn-off button, connected in series with the on button of the contactor, connected in series through a circuit breaker with a voltage transformer, and on the side of the controller the first chain is connected in series with the second chain in such a way that the boom control controller is connected to the connection point of the indicated chains, the lamp on button is located opposite to the position of the contactor on button, between the contactor on and the thermal relay it is parallel to the first chain a relay switch in such a way that between this switch and the switch off button there is a switch button on the contactor so that the button Ia and off button contactor and circuit breaker switch relays and operate collectively respectively as the manual switching node and automatic shut-off, the second contacts of the transformer, the switch and the lamp contacts undervoltage relay grounded.

Introduction to the circuit of a separate relay switch in conjunction with a circuit connection from the controllers for controlling the operation of the main crane nodes and a circuit ensuring their switching on and off in one serial circuit with a circuit breaker between the transformer and the rest of the circuit with the above-described connection of the circuit elements of the main crane contactor enables significantly to simplify this circuit by excluding the electric motor from the circuit and retaining the functions of manual switching on and automatic switching off, which There is an opportunity to increase the reliability of its work.

The technical result is a simplification of the circuit while increasing its reliability.

The inventive circuit has a novelty in comparison with the prototype, differing from it in such essential features by the presence of a switch between the transformer and the rest of the circuit, the interconnection of the first chain of series-connected elements for locking the door to the equipment room, self-propelled control controller, load control controller, boom control controller and second chain of undervoltage relay and thermal relay in series in one circuit, introduction to the circuit of a relay switch installed in parallel with dividing the chain and connected through it by the power button of the contactor connected to the start button connected to the beginning of the first chain, the location of the power button on the side opposite to the location of the power button, performing the function of the manual power on and automatic power off by the specified power on, power off and relay switch, which together provide a solution to the problem - simplifying the circuit and increasing its reliability.

The inventive electrical circuit can be widely used in the repair and modernization of powerful railway cranes EBC, providing import substitution, and therefore meets the criterion of "industrial applicability".

The utility model is illustrated in the drawing, which shows the electrical circuit for switching on the main contactor of the crane.

The inventive electrical circuit for switching on the main contactor comprises a voltage transformer 1 connected through a circuit breaker 2 in parallel with a lamp 3 for controlling the switching on of the contactor, which is connected in series with its switch 4, and in parallel with a circuit from the first circuit in series from each other from the button 5 for switching off the contactor, an element 6 lock the door to the equipment room, self-propelled control controller 7, load lifting control controller 8, boom control controller 9, and a second chain of those lovogo relay 10 and relay 11 undervoltage. At the same time, a relay switch 12 is connected between it and the control lamp 3 in parallel, connected by one contact to the connection point of the two chains, and the second contact with the contactor on button 13 connected by the second contact to the contactor off button 5. The second output of the transformer 1, the switch contact 4, contacts 14 and 15 of the relay 11 of the minimum voltage are grounded.

The scheme works as follows.

By turning on the main contactor, an alternating voltage of three-phase current of 380 V is supplied to switching devices, including the main and additional equipment of the crane, and to control and measuring devices that display in real time the voltage, frequency and magnitude of the load (current).

Before switching on the main contactor, the following conditions must be met.

1. Controllers 7-9 control, respectively, self-propelled, cargo, boom should be in the zero position.

2. The door to the control room is closed (blocked by element 6).

3. The presence of a voltage in the single-phase current network of at least 210 V.

4. Lack of short circuit in the power circuit.

To turn on the contactor system of the main contactor, it is necessary to supply power from the crane’s own diesel generator set or external sources to the input plug with a voltage of three-phase alternating current 380 V, then through a control transformer 1 380 V to 220 V, through a circuit breaker 2 to 45 A, single-phase alternating current to the power button 13.

When you press the power button 13, the following circuit is created: the power button 13, the power button 5, the self-propelled control controller 7, the load control controller 8, the boom control controller 9. After that, using the switch 12 turns on the relay 11 of the minimum voltage. After a five-second delay, the coil is energized, the main switch circuit is completely closed, which includes the thermal (thermal) relay 10. Then, by pressing the power button 13, the main switch is turned on and the lamp 3 for controlling the main switch is turned on.

In this case, the manual on button has a power button 13 and a button 5 to turn off the contactor, and the circuit breaker 2, the undervoltage relay 11 and the thermal relay 10 perform the function of automatic shutdown

The operation of the main switch.

Under abnormal operating conditions (short circuit, overload, voltage in the circuit below 210 V, open door to the equipment room), the following occurs: block contacts are activated in the circuit of the holding coil of the main switch, power loss occurs, which leads to its shutdown.

To restore its work, you must:

- set all controllers to zero position;

- find out the reason for the shutdown (by external signs);

- manually restore (when triggered) the thermal relay block contacts;

- make sure voltage is present;

- turn on the main switch.

In comparison with the prototype, the claimed electrical circuit for switching on the main contactor is simpler and more reliable in operation.

Claims (1)

An electrical circuit for turning on the main contactor of the crane, including a voltage transformer connected to the manual on and off unit, one output of which is connected to the first chain of the door-to-equipment blocking element, the self-propelled control controller, the load control controller, the boom control controller, and connected to the power button of the contactor, and the second output is connected to the second chain of series-connected relays of minimum voltage, thermal p and the contactor’s turn-off button, connected between the lighting transformer and the first circuit in parallel with them, a contactor on-off control lamp connected in series with its turn-on button, characterized in that the first chain on the side of the door lock element is connected to the contactor’s turn-off button connected in series with the contactor’s turn-on button connected in series through a circuit breaker with a voltage transformer, and on the side of the boom control controller, the first chain is connected in series with the second chain in such a way that the boom control controller is connected to the connection point of the indicated chains, the lamp on button is located on the side opposite to the position of the contactor’s power button, between the contactor’s power button and the thermal relay, the relay switch is installed parallel to the first chain in such a way that between this switch and the off button of the contactor is located the on button of the contactor so that the on and off buttons of the contactor and The electrical switch, the relay switch, and the relay together perform respectively the functions of the manual switch-on and automatic switch-off unit, while the second contacts of the transformer, the lamp switch, and the contacts of the undervoltage relay are grounded.

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