Motor voltage loss restart control circuit

Abstract

The utility model discloses a motor voltage loss restart control circuit comprising a main control loop, a remote start loop, a voltage loss restart loop, a voltage detection loop, an equipment operation state monitoring loop and a main circuit. The no-voltage restart loop is a gh end of the no-voltage restart controller forming a closed loop; the no-voltage restart loop is connected in parallel with the ab end of the in-situ button box, the start button and the stop button which are connected in series in the main control loop; the voltage detection loop is an ab end of the voltage loss restart controller forming a closed loop; the voltage detection loop is connected in parallel with the main control loop; and the equipment running state monitoring loop comprises an ef end of the no-voltage restart controller and a normally open contact of the contactor which are connected in series to form a closed loop. According to the utility model, the time of equipment shutdown caused by voltage sag can be greatly shortened, so that the equipment can be quickly recovered to run, the influence on the field process production flow is reduced, and the production is ensured not to be interrupted.

Description

Technical field:

[0001] The utility model relates to the field of control circuits, in particular to a motor voltage-loss restart control circuit. Background technology:

[0002] During the operation of electrical equipment, the start and stop control of the motor is realized by a control circuit composed of electrical components. If the voltage of the power supply system drops temporarily, it is very easy to cause a sudden change in the voltage of the control circuit, and the contactor will be tripped due to undervoltage, causing the motor to trip and cause on-site production accidents; after the equipment trips, it is necessary to manually check the situation on site and reset it to ensure safety before restarting production. Affected by the actual situation of the production system, this process takes a long time and affects the efficient and normal operation of the production system; if a complete set of equipment that can provide power support during a voltage drop is used, the cost is too high. Utility model content:

[0003] The utility model aims to provide a motor voltage loss restart control circuit.

[0004] The utility model is implemented by the following technical solutions:

[0005] A motor voltage loss restart control circuit, comprising a main control circuit, a remote start circuit, a voltage loss restart circuit, a voltage detection circuit, an equipment operation status monitoring circuit and a main circuit;

[0006] The main control circuit includes the ab end of the local button box, the start button, the stop button, the DCS stop button, and the coil of the contactor which are connected in series to form a closed loop;

[0007] The remote start circuit includes the cd end of the local button box and the DCS start button which are connected in series to form a closed circuit; the remote start circuit is connected in parallel with the ab end of the local button box and the start button which are connected in series in the main control circuit; the coil of the contactor is connected in parallel with the coil of the relay, and the normally open contact of the relay is connected in parallel with the remote start circuit;

[0008] The pressure loss restart circuit is the gh terminal of the pressure loss restart controller forming a closed loop; the pressure loss restart circuit is connected in parallel with the ab terminal of the local button box, the start button and the stop button connected in series in the main control circuit;

[0009] The voltage detection loop is the ab terminal of the voltage loss restart controller forming a closed loop; the voltage detection loop is connected in parallel with the main control loop;

[0010] The equipment operation status monitoring circuit includes the ef terminal of the pressure loss restart controller and a normally open contact of the contactor connected in series to form a closed circuit;

[0011] The main circuit includes a normally open contact of a contactor and a motor connected in series; the main circuit is connected to a three-phase power supply.

[0012] Preferably, it also includes a running indication circuit and a parking indication circuit;

[0013] The operation indication circuit includes a normally open contact of a contactor connected in series to form a closed circuit and an operation indicator light;

[0014] The parking indication circuit includes a normally closed contact of a contactor and a parking indicator light which are connected in series to form a closed circuit.

[0015] The utility model has the advantages that the utility model can greatly shorten the time of equipment shutdown caused by voltage sag, so that the equipment can be quickly restored to operation, thereby reducing the impact on the on-site process production process and ensuring uninterrupted production. Description of the drawings:

[0016] Figure 1 It is a schematic diagram of a control circuit of the utility model.

[0017] In the figure: local button box 1, pressure loss restart controller 2, DCS stop button 3, DCS start button 4, motor 5, start button SB1, stop button SB2, contactor KM, relay KA, running indicator light RD1, stop indicator light RD2, circuit breaker QF. Specific implementation method:

[0018] like Figure 1 As shown, a motor voltage loss restart control circuit includes a main control circuit, a remote start circuit, a voltage loss restart circuit, a voltage detection circuit, an equipment operation status monitoring circuit and a main circuit;

[0019] The main control circuit includes the ab end of the local button box 1, the start button SB1, the stop button SB2, the DCS stop button 3, and the coil of the contactor KM, which are connected in series to form a closed loop;

[0020] The remote start circuit includes the cd end of the local button box 1 and the DCS start button SB14 which are connected in series to form a closed circuit; the remote start circuit is connected in parallel with the ab end of the local button box 1 and the start button SB1 which are connected in series in the main control circuit; the coil of the contactor KM is connected in parallel with the coil of the relay KA, and the normally open contact of the relay KA is connected in parallel with the remote start circuit;

[0021] The pressure loss restart circuit is the gh end of the pressure loss restart controller 2 forming a closed loop; the pressure loss restart circuit is connected in parallel with the ab end of the local button box 1, the start button SB1 and the stop button SB2 connected in series in the main control circuit;

[0022] The voltage detection loop is the ab terminal of the pressure loss restart controller 2 that forms a closed loop; the voltage detection loop is connected in parallel with the main control loop;

[0023] The equipment operation status monitoring circuit includes the ef terminal of the pressure loss restart controller 2 and a normally open contact of the contactor KM which are connected in series to form a closed circuit;

[0024] The main circuit includes a normally open contact of the contactor KM and the motor 5 connected in series; the main circuit is connected to a three-phase power supply, and a circuit breaker QF is installed on the circuit;

[0025] In normal operation, after meeting the requirements for starting the motor 5, press the switch of the local button box 1, and the ab and cd ends of the local button box 1 are connected respectively; when starting manually on site, press the start button SB1, the main control circuit is connected, the coil of the contactor KM is energized, the normally open contact of the motor 5 is closed, the motor 5 is powered on, and the motor 5 is started; when stopping, press the stop button SB2, the main control circuit is disconnected, the coil of the contactor KM is de-energized, the normally open contact of the motor 5 is disconnected, the motor 5 is powered off, and the motor 5 is stopped; when starting remotely, press the DCS start button SB14, the remote start circuit is connected, the coil of the contactor KM is energized, the normally open contact of the motor 5 is closed, the motor 5 is powered on, and the motor 5 is started; when stopping, press the DCS stop button 3, the coil of the contactor KM is de-energized, the normally open contact of the motor 5 is disconnected, the motor 5 is powered off, and the motor 5 is stopped;

[0026] A self-locking function is set. After the contactor KM is energized, the relay KA is also energized, and the normally open contact of the relay KA is closed, bypassing the cd terminal of the local button box 1, the DCS start button SB14 and the remote start circuit, forming a self-locking function.

[0027] During operation, the ef end of the pressure loss restart controller 2 is used to detect the opening and closing state of the relay KA, that is, the operating state of the motor 5, and the ab end of the pressure loss restart controller 2 is used to detect the voltage on both sides of the main control circuit; when an instantaneous pressure loss occurs during the operation of the motor 5, the ef end of the pressure loss restart controller 2 detects that the contactor KM is disconnected due to the pressure loss, and the voltage of the main control circuit is normal, and controls the gh end of the pressure loss restart controller 2 to be closed and connected, and the pressure loss restart circuit is connected, the contactor KM coil is quickly energized, and the motor 5 resumes operation; the utility model can greatly shorten the time of equipment shutdown caused by voltage drop, so that the equipment can resume operation quickly, thereby reducing the impact on the on-site process production flow and ensuring uninterrupted production.

[0028] It also includes a running indication circuit and a parking indication circuit; the running indication circuit includes a normally open contact of the contactor KM connected in series to form a closed circuit and a running indicator light RD1; the parking indication circuit includes a normally closed contact of the contactor KM connected in series to form a closed circuit and a parking indicator light RD2;

[0029] During the operation of motor 5, the normally open contact of contactor KM is closed, the normally closed contact is disconnected, the operation indication circuit is connected, the stop indication circuit is disconnected, the operation indicator light RD1 is on, and the stop indicator light RD2 is off; during the parking period of motor 5, the normally open contact of contactor KM is disconnected, the normally closed contact is closed, the operation indication circuit is disconnected, the stop indication circuit is connected, the operation indicator light RD1 is off, and the stop indicator light RD2 is on.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor voltage loss restart control circuit, characterized in that: Including main control circuit, remote start circuit, pressure loss restart circuit, voltage detection circuit, equipment operation status monitoring circuit and main circuit; The main control circuit includes the ab end of the local button box, the start button, the stop button, the DCS stop button, and the coil of the contactor which are connected in series to form a closed loop; The remote start circuit includes the cd end of the local button box and the DCS start button which are connected in series to form a closed circuit; the remote start circuit is connected in parallel with the ab end of the local button box and the start button which are connected in series in the main control circuit; the coil of the contactor is connected in parallel with the coil of the relay, and the normally open contact of the relay is connected in parallel with the remote start circuit; The pressure loss restart circuit is the gh terminal of the pressure loss restart controller forming a closed loop; the pressure loss restart circuit is connected in parallel with the ab terminal of the local button box, the start button and the stop button connected in series in the main control circuit; The voltage detection loop is the ab terminal of the voltage loss restart controller forming a closed loop; the voltage detection loop is connected in parallel with the main control loop; The equipment operation status monitoring circuit includes the ef terminal of the pressure loss restart controller and a normally open contact of the contactor connected in series to form a closed circuit; The main circuit includes a normally open contact of a contactor and a motor connected in series; the main circuit is connected to a three-phase power supply.

2. A motor voltage loss restart control circuit according to claim 1, characterized in that: It also includes a running indication circuit and a parking indication circuit; The operation indication circuit includes a normally open contact of a contactor connected in series to form a closed circuit and an operation indicator light; The parking indication circuit includes a normally closed contact of a contactor and a parking indicator light which are connected in series to form a closed circuit.

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