Star-delta step-down starting control system

Abstract

The utility model discloses a star-delta step-down start control system, which comprises a power supply contactor, an angle type contactor, a star type contactor, a thermal relay, a stop button, a start button, a first intermediate relay, a second intermediate relay, a third intermediate relay and a fourth intermediate relay. The device has the advantages that faults of the angle type contactor and the star type contactor can be accurately judged by adding the second intermediate relay and the fourth intermediate relay, a coil of a power supply contactor can be cut off in time, the motor is powered off immediately, the motor stops running immediately, and running with faults of the motor cannot be caused; loss can be stopped when a fault is found, and the motor can be prevented from being burnt in time; and a normal indicating lamp and a fault indicating lamp are arranged, so that a real-time warning effect can be achieved.

Description

Technical field:

[0001] The utility model relates to the technical field of star-delta voltage reduction starting, in particular to a star-delta voltage reduction starting control system. Background technology:

[0002] The coal screening and crushing motor adopts star-delta step-down starting. The main circuit of star-delta step-down starting is as follows: Figure 1 As shown in the figure, when the main circuit contactor KM1 and the star contactor KM3 are both closed and the angle contactor KM2 is disconnected, the main circuit is in star connection; when the main circuit contactor KM1 and the angle contactor KM2 are both closed and the star contactor KM3 is disconnected, the main circuit is in angle connection. Figure 2 As shown, its working principle is: after pressing the start button SB2, the coil of the main circuit contactor KM1 is energized, the main contact of the main circuit contactor KM1 is closed, and the auxiliary normally open contact is closed to make the main circuit contactor KM1 self-locking; the coil of the star contactor KM3 is energized, the main contact of the star contactor KM3 is closed, and the motor is started in star shape; the coil of the time relay KT is energized, and the motor runs in a star connection mode until the time set by the time relay KT is reached, the power-on delay disconnection contact of the time relay KT is disconnected, and the power-on delay closing contact is closed, so that the coil of the star contactor KM3 is de-energized, the coil of the angle contactor KM2 is energized, and the normally open contact of the angle contactor KM2 is closed to make the angle contactor KM2 self-locking; at the same time, in the main circuit, the main contact of the star contactor KM3 is opened, and the main contact of the angle contactor KM2 is closed, and the motor runs in an angle connection mode.

[0003] In addition, patent 202221047174.X is a star-delta step-down starting control circuit, which sets the coil of the intermediate relay KA in parallel on the time relay KT, and sets the normally open contact and normally closed contact of the corresponding intermediate relay KA on the main circuit contactor control circuit 1. When the time relay KT fails, the coil of the main circuit contactor KM1 will be cut off in time, ending the next step of the star-delta step-down starting, so that the motor cannot be started when the time relay KT fails, further enhancing the safety of the star-delta step-down starting; at the same time, there are main circuit contactor contact fault indication circuit, star contactor contact fault indication circuit, and angle contactor contact fault indication circuit. The operator can judge whether the main contact of the corresponding contactor is sticking by the indicator light, which improves the efficiency of the pre-start inspection. However, the above patent can only issue a warning when the power contactor fails, but cannot cut off the control circuit in time, and there are still problems of motor overload and even burning. In addition, since the star contactor is started frequently and the running time is short, the star contactor coil is often damaged, fails to attract, and is not easy to detect; during the starting process, it is often not star-started, and then the angle-start is performed after the time is up. For heavy-duty starting equipment, the motor is often burned out; or after the star start is completed, the angle contactor runs for a long time, causing the angle contactor coil to burn out, the main contacts to fail to attract, and the motor is in the star operation state for a long time, which is not easy to detect, and heavy load operation can easily cause the motor to burn out. Utility model content:

[0004] The utility model aims to provide a star-delta voltage reduction starting control system.

[0005] The utility model is implemented by the following technical scheme: a star-delta step-down starting control system, which includes a power contactor, an angle contactor, a star contactor, and a thermal relay, and also includes a stop button, a start button, a first intermediate relay, a second intermediate relay, a third intermediate relay, and a fourth intermediate relay. The start button and the auxiliary normally open contact of the power contactor are connected in parallel to form a first branch, the auxiliary normally closed contact of the fourth intermediate relay, the auxiliary normally closed contact of the second intermediate relay, and the coil of the power contactor are connected in series to form a second branch, the coil of the star contactor and the coil of the first intermediate relay are connected in parallel and then connected in series with the power-on delay disconnection contact of the time relay to form a third branch, the third branch and the coil of the time relay are connected in parallel and then connected in series with the first normally closed contact of the angle contactor to form a fourth branch; the first normally closed contact of the star contactor, the power-on delay closing contact of the time relay, and the first normally open contact of the angle contactor are connected in series. The parallel branch of the contacts, the parallel branch of the coil of the angle contactor and the coil of the third intermediate relay are connected in series to form the fifth branch; the normally closed contact of the thermal relay, the stop button, and the first branch are connected in series and then connected in series with the second branch, the fourth branch, and the fifth branch respectively, and then connected to the power supply; the normally open contact of the star contactor and the star normal indicator light are connected in series to form the sixth branch, the second normally closed contact of the star contactor and the parallel branch of the star abnormal indicator light and the coil of the second intermediate relay are connected in series to form the seventh branch, and the normally open contact of the first intermediate relay is connected in series with the sixth branch and the seventh branch respectively, and then connected to the power supply; the second normally open contact of the angle contactor and the angle normal indicator light are connected in series to form the eighth branch, the second normally closed contact of the angle contactor and the parallel branch of the angle abnormal indicator light and the coil of the fourth intermediate relay are connected in series to form the ninth branch, and the normally open contact of the third intermediate relay is connected in series with the eighth branch and the ninth branch respectively, and then connected to the power supply.

[0006] The advantages of the utility model are as follows: by adding the second intermediate relay and the fourth intermediate relay, the faults of the angle contactor and the star contactor can be accurately determined, and the coil of the power contactor can be disconnected in time, so that the motor is immediately powered off and the motor stops running immediately, and the motor will not run with a fault; the loss can be stopped as soon as a fault is found, and the burning of the motor can be avoided in time; and a normal indicator light and a fault indicator light showing the operating status of the angle contactor and the star contactor are provided, which can serve as a constant alert. Description of the drawings:

[0007] Figure 1 This is the main circuit diagram of star-delta step-down starting;

[0008] Figure 2 This is the existing star-delta step-down starting control circuit diagram;

[0009] Figure 3 This is the star-delta step-down starting control circuit diagram of this embodiment.

[0010] Stop button SB1, start button SB2, power contactor KM1, angle contactor KM2, star contactor KM3, first intermediate relay KA1, second intermediate relay KA2, third intermediate relay KA3, fourth intermediate relay KA4, star-shaped normal indicator light HL1, star-shaped abnormal indicator light HL2, angle-shaped normal indicator light HL3, angle-shaped abnormal indicator light HL4, motor M, time relay KT, thermal relay FR. Specific implementation method:

[0011] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0012] like Figure 3 As shown, a star-delta step-down starting control system includes a power contactor KM1, an angle contactor KM2, a star contactor KM3, a thermal relay FR, a stop button SB1, a start button SB2, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, and a fourth intermediate relay KA4. The start button SB2 and an auxiliary normally open contact of the power contactor KM1 are connected in parallel to form a first branch. The auxiliary normally closed contact of the fourth intermediate relay KA4, the auxiliary normally closed contact of the second intermediate relay KA2, and the coil of the power contactor KM1 are connected in series to form a second branch. The coil of the star contactor KM3 and the coil of the first intermediate relay KA1 are connected in parallel and then connected in series with the power-on delay disconnection contact of the time relay KT to form a third branch. The third branch and the coil of the time relay KT are connected in parallel and then connected in series with the first normally closed contact of the angle contactor KM2 to form a fourth branch.

[0013] The first normally closed contact of the star contactor KM3, the power-on delayed closing contact of the time relay KT and the parallel branch of the first normally open contact of the angle contactor KM2, the coil of the angle contactor KM2 and the parallel branch of the coil of the third intermediate relay KA3 are connected in series to form the fifth branch; the normally closed contact of the thermal relay FR, the stop button SB1, and the first branch are connected in series and then connected in series with the second branch, the fourth branch, and the fifth branch respectively, and then connected to the power supply; the normally open contact of the star contactor KM3 and the star normal indicator light HL1 are connected in series to form the sixth branch, and the second normally closed contact of the star contactor KM3 and the star normal indicator light HL1 are connected in series to form the sixth branch. The parallel branch of the angle abnormality indicator light HL2 and the coil of the second intermediate relay KA2 is connected in series to form the seventh branch, and the normally open contact of the first intermediate relay KA1 is connected in series with the sixth branch and the seventh branch respectively and then connected to the power supply; the second normally open contact of the angle contactor KM2 and the angle normal indicator light HL3 are connected in series to form the eighth branch, the second normally closed contact of the angle contactor KM2 and the parallel branch of the angle abnormality indicator light HL4 and the coil of the fourth intermediate relay KA4 are connected in series to form the ninth branch, and the normally open contact of the third intermediate relay KA3 is connected in series with the eighth branch and the ninth branch respectively and then connected to the power supply.

[0014] Working principle:

[0015] 1. Press the start button SB2 once - the coils of the power contactor KM1, the star contactor KM3, the first intermediate relay KA1 and the time relay KT are all energized, the normally open contact of the power contactor KM1 is closed to achieve self-locking, at the same time, the normally open contacts of the star contactor KM3 and the first intermediate relay KA1 are in the closed state, the normally closed contacts are in the open state, the star normal indicator HL1 is on, and the star abnormal indicator HL2 is off. At this time, the motor is in the star normal operating state;

[0016] When the coil of the star contactor KM3 fails, the normally open contact of the star contactor KM3 cannot be closed and the normally closed contact is closed. At this time, the star normal indicator light HL1 is not on, and the star abnormal indicator light HL2 is on, indicating that the star contactor KM3 is faulty and the motor M cannot perform star operation. At this time, the coil of the second intermediate relay KA2 is energized, and its normally closed contact is in the disconnected state, disconnecting the power contactor KM1 coil circuit. At this time, the motor M is actually in a stopped state.

[0017] 2. When the time relay KT reaches the set time, the motor enters the angle operation state: the delayed closing contact of the time relay KT is closed, the angle contactor KM2 and the third intermediate relay KA3 coils are energized, and at the same time, the auxiliary normally open contacts of the angle contactor KM2 and the third intermediate relay KA3 are in the closed state, the angle normal indicator HL3 is on, the angle abnormal indicator HL4 is off, and the motor is in the angle normal operation state. When the angle contactor KM2 coil fails, the normally open contact of the angle contactor KM2 is disconnected and the normally closed contact is closed. At this time, the coil of the fourth intermediate relay KA4 is energized, the angle normal indicator HL3 is off, and the angle abnormal indicator HL4 is on. The normally closed contact of the fourth intermediate relay KA4 is disconnected, disconnecting the power contactor KM1 coil circuit, and the motor M immediately stops running.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A star-delta step-down starting control system, comprising a power contactor (KM1), a angular contactor (KM2), a star contactor (KM3), and a thermal relay (FR), characterized in that: It also includes a stop button (SB1), a start button (SB2), a first intermediate relay (KA1), a second intermediate relay (KA2), a third intermediate relay (KA3), and a fourth intermediate relay (KA4); the start button (SB2) and the auxiliary normally open contact of the power contactor (KM1) are connected in parallel to form a first branch; the auxiliary normally closed contact of the fourth intermediate relay (KA4), the auxiliary normally closed contact of the second intermediate relay (KA2), and the coil of the power contactor (KM1) are connected in series to form a second branch; the coil of the star contactor (KM3) and the coil of the first intermediate relay (KA1) are connected in parallel and then connected in series with the power-on delay disconnection contact of the time relay (KT) to form a third branch; The third branch is connected in parallel with the coil of the time relay (KT) and then connected in series with the first normally closed contact of the angular contactor (KM2) to form a fourth branch; The first normally closed contact of the star contactor (KM3), the power-on delayed closing contact of the time relay (KT), the parallel branch of the first normally open contact of the angle contactor (KM2), the coil of the angle contactor (KM2) and the parallel branch of the coil of the third intermediate relay (KA3) are connected in series to form a fifth branch; the normally closed contact of the thermal relay (FR), the stop button (SB1), and the first branch are connected in series and then connected in series with the second branch, the fourth branch, and the fifth branch respectively, and then connected to the power supply; the normally open contact of the star contactor (KM3) and the star normal indicator light (HL1) are connected in series to form a sixth branch, and the second normally closed contact of the star contactor (KM3) and the The parallel branches of the star-shaped abnormal indicator light (HL2) and the coil of the second intermediate relay (KA2) are connected in series to form a seventh branch, and the normally open contact of the first intermediate relay (KA1) is connected in series with the sixth branch and the seventh branch respectively and then connected to a power source; the second normally open contact of the angle contactor (KM2) and the angle normal indicator light (HL3) are connected in series to form an eighth branch, the second normally closed contact of the angle contactor (KM2) and the parallel branches of the angle abnormal indicator light (HL4) and the coil of the fourth intermediate relay (KA4) are connected in series to form a ninth branch, and the normally open contact of the third intermediate relay (KA3) is connected in series with the eighth branch and the ninth branch respectively and then connected to a power source.

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