A motor power-off self-starting and resetting control circuit
By adding a power outage delay time relay in the oil pump motor control circuit, the short-term power loss problem caused by dual power switching is solved, and the self-starting and rapid reset of the oil pump motor is realized, avoiding the occurrence of grinding jump.
Patent Information
- Application Number
- CN202411633049.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-04-01
AI Technical Summary
The oil pump motor control circuit provided with the lubricating oil station of the medium-speed coal mill is prone to temporary power loss or power supply failure during the dual power switching process, causing the oil pump motor circuit to send a stop signal and cause a grinding jump.
A motor power-off self-starting and reset control circuit is designed. By adding two power-off delay time relays (K35 and K36) to the original control circuit, it realizes the delay power-off and self-starting functions in the case of dual power switching or abnormal power loss.
After dual power switching or abnormal power loss, the delay power-off relay ensures that the oil pump motor starts automatically after returning to normal power supply, avoiding the occurrence of grinding jumps, and also providing a reset function to quickly stop the motor.
Smart Images
Figure CN119742712A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of electrical control circuit design, and in particular to a motor power-off self-starting and resetting control circuit. Background Art
[0002] At present, the oil pump motor control circuit of the lubricating oil station of the medium-speed coal mill will have a short power outage or power failure during the dual power supply line switching process. The oil pump motor circuit will send a stop signal to the DCS system at the same time, which will cause the mill to jump under the interlocking condition. Summary of the invention
[0003] The object of the present invention is to provide a motor power-off self-starting and resetting control circuit to solve the above problems.
[0004] In a first aspect, an embodiment of the present invention provides a motor power-off self-starting and reset control circuit, comprising: a live wire L and a neutral wire N, wherein the live wire L side is sequentially connected in series with an intermediate relay K33, a reset button S32, an intermediate relay K32, a thermal relay FR21, and an AC contactor KM31, and then connected to the neutral wire N; the live wire L side is sequentially connected in series with an intermediate relay K34 and a distributed control system X3:1X3:2, and then connected between the reset button S32 and the intermediate relay K32; the live wire L side is sequentially connected in series with an AC contactor KM31, and then connected to the reset button S 32 and the intermediate relay K32; the live wire L side is connected in series with the intermediate relay K33, the reset button S33, and the intermediate relay K32 in sequence and then connected to the neutral wire N; the live wire L side is connected in series with the intermediate relay K34 and the distributed control system X3:3X3:4 in sequence and then connected between the reset button S33 and the intermediate relay K32; a power-off delay time relay K35 and a power-off delay time relay K36 are also connected between the thermal relay FR21 and the neutral wire N, and the power-off delay time relay K35 and the power-off delay time relay K36 are arranged in parallel.
[0005] Optionally, the power-off delay time of the power-off delay time relay K35 can be freely set.
[0006] Optionally, the power-off delay time of the power-off delay time relay K35 is set to 5s.
[0007] Optionally, the AC contactor KM31 and the power-off delay time relay K35 are arranged in parallel.
[0008] Optionally, the intermediate relay K33 and the intermediate relay K34 are arranged in parallel. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0010] Figure 1 A schematic diagram of the structure of a motor power-off self-start and reset control circuit provided in one embodiment of the present invention. DETAILED DESCRIPTION
[0011] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0012] like Figure 1 , This embodiment provides a motor power-off self-start and reset control circuit, including: a live wire L and a neutral wire N, the live wire L is connected in series with an intermediate relay K33, a reset button S32, an intermediate relay K32, a thermal relay FR21, and an AC contactor KM31 in sequence, and then connected to the neutral wire N;
[0013] The live wire L side is connected in series with the intermediate relay K34 and the distributed control system X3:1X3:2 in sequence and then connected between the reset button S32 and the intermediate relay K32;
[0014] The live wire L is connected in series with the AC contactor KM31 and then connected between the reset button S32 and the intermediate relay K32;
[0015] The live wire L is connected in series with the intermediate relay K33, the reset button S33, the intermediate relay K32 in sequence, and then connected to the neutral wire N;
[0016] The live wire L side is connected in series with the intermediate relay K34 and the distributed control system X3:3X3:4 in sequence and then connected between the reset button S33 and the intermediate relay K32.
[0017] In particular, a power-off delay time relay K35 and a power-off delay time relay K36 are connected between the thermal relay FR21 and the neutral line N, and the power-off delay time relay K35 and the power-off delay time relay K36 are arranged in parallel.
[0018] It should be noted that:
[0019] The intermediate relay K33 can be used for circuit conversion, to achieve connection or disconnection between different circuits, and to achieve the connection of the local circuit loop.
[0020] The intermediate relay K34 can be used for circuit conversion, to achieve connection or disconnection between different circuits, and to achieve the connection of remote circuit loops.
[0021] The intermediate relay K32 can be used for circuit conversion, to achieve connection or disconnection between different circuits, and to achieve disconnection of the local circuit loop.
[0022] The reset button S32 is used to manually send out a control signal to control contactors, relays and other equipment. It is used to connect the local control circuit.
[0023] The reset button S33 is used to manually send out a control signal to control contactors, relays and other equipment. It is used to disconnect the local control circuit.
[0024] Thermal relay FR21 provides overload protection for the motor and can quickly cut off the circuit to prevent the motor winding from overheating, thereby protecting the motor.
[0025] AC contactor KM31 is used for frequent starting and remote control of motors, and controls the on and off of the circuit through the main contacts.
[0026] In the figure, X3:1X3:2 are the start signals sent by the distributed control system (DCS).
[0027] In the figure, X3:3X3:4 is the stop signal sent by the distributed control system (DCS).
[0028] The present embodiment provides a motor power-off self-starting and resetting control circuit, which is mainly different in that it is realized by adding two power-off delay time relays to the original control circuit. The two power-off delay time relays are added, such as the power-off delay time relay K35 and the power-off time relay K36.
[0029] After the dual power supply is switched or the power is lost abnormally, the normally open contact of the power-off delay time relay K35 will be closed for a delay time (the power-off delay time can be freely set, generally set to 5s). When the normal power supply is restored, after the power supply operation command signal fails, the oil pump motor can start automatically to ensure the continuous operation of the system. When the pump is turned off locally or remotely, the reset function of the power-off delay time relay K35 can stop the motor instantly.
[0030] After the dual power supply is switched or in the case of abnormal power failure, the power-off time relay K36 delays the sending of the status signal of the oil pump motor (the time is set to be greater than the dual power supply switching time < 2s) to avoid the oil pump motor circuit sending a stop status signal to the DCS simultaneously due to a short-term power failure during the dual power supply switching process, causing a grinding accident under the interlocking condition.
[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A motor power-off self-starting and resetting control circuit, comprising: A live wire L and a neutral wire N, wherein the live wire L is connected in series with an intermediate relay K33, a reset button S32, an intermediate relay K32, a thermal relay FR21, an AC contactor KM31, and then connected to the neutral wire N; The live wire L side is connected in series with the intermediate relay K34 and the distributed control system X3:1X3:2 in sequence and then connected between the reset button S32 and the intermediate relay K32; The live wire L side is connected in series with the AC contactor KM31 and then connected between the reset button S32 and the intermediate relay K32; The live wire L is connected in series with the intermediate relay K33, the reset button S33, the intermediate relay K32 in sequence, and then connected to the neutral wire N; The live wire L side is connected in series with an intermediate relay K34 and a distributed control system X3:3X3:4 in sequence and then connected between the reset button S33 and the intermediate relay K32; it is characterized in that: a power-off delay time relay K35 and a power-off delay time relay K36 are also connected between the thermal relay FR21 and the neutral wire N, and the power-off delay time relay K35 and the power-off delay time relay K36 are arranged in parallel.
2. The motor power-off self-start and reset control circuit according to claim 1, characterized in that: The power-off delay time of the power-off delay time relay K35 can be set freely.
3. The motor power-off self-start and reset control circuit according to claim 2, characterized in that: The power-off delay time of the power-off delay time relay K35 is set to 5s.
4. The motor power-off self-start and reset control circuit according to claim 1, characterized in that: The AC contactor KM31 and the power-off delay time relay K35 are arranged in parallel.
5. The motor power-off self-start and reset control circuit according to claim 1, characterized in that: The intermediate relay K33 and the intermediate relay K34 are arranged in parallel.