Motor starter control circuit system with maintenance switch

Abstract

This invention discloses a motor starter control circuit system with a maintenance switch, including a start button, a local start button, a stop button, a local stop button, a local emergency stop button, a contactor, a first control relay, a first auxiliary contact of the first control relay, a second auxiliary contact of the first control relay, a third auxiliary contact of the first control relay, a second control relay, a first auxiliary contact of the second control relay, an indicator light, a maintenance indicator light, a first contact of the first maintenance switch, a second contact of the first maintenance switch, and a third contact of the first maintenance switch. This motor starter control circuit system with a maintenance switch is convenient to operate; the maintenance switch has two contacts in the main control circuit, reducing the failure rate of the maintenance switch itself, and can be locked to ensure that other personnel cannot operate it, increasing the safety of maintenance personnel; when the maintenance switch contact is open, a maintenance indicator light will appear at the starter, so that other personnel know that the motor is under maintenance and will not operate it accidentally.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor starter control circuit system with a maintenance switch. BACKGROUND

[0002] In the electrical start-stop control circuit of conventional motors, fans and other equipment, it is mainly composed of start button, stop button, emergency stop button, control relay or contactor, thermal relay, indicator light and other components. In this control circuit, the contactor is powered on to drive the motor to run when the start button or local start button is pressed. The contactor loses power to stop the motor when the stop button or local stop button is pressed. In the event of an emergency during motor operation, the emergency stop button can also be pressed to stop the motor.

[0003] Since the starter of the motor and other equipment is generally in the ship's control room, not in the local motor, and the local only has a start, stop, emergency stop button box, for this control circuit, when the motor is being repaired, the power switch QF in the starter needs to be disconnected. However, since the starter is not in the local, it is possible that the maintenance personnel are repairing the motor in the local motor, and other personnel do not know the relevant situation, which may cause the starter to start the motor and harm the maintenance personnel. Since the emergency stop button has a self-locking function, the emergency stop button can also be pressed in the local to repair the motor, but this operation violates the function of the emergency stop button itself, and may also cause the emergency stop button contact to fail, resulting in an unexpected danger during maintenance. SUMMARY

[0004] The purpose of the present application is to provide a motor starter control circuit system with a maintenance switch.

[0005] The technical scheme adopted by the present application to achieve the above-mentioned purpose is: a motor starter control circuit system with a maintenance switch, comprising a start button, a local start button, a stop button, a local stop button, a local emergency stop button, a contactor, a first control relay, a first control relay first auxiliary contact, a first control relay second auxiliary contact, a first control relay third auxiliary contact, a second control relay, a second control relay first auxiliary contact, an indicator lamp, a maintenance indicator lamp, a first maintenance switch first contact, a first maintenance switch second contact and a first maintenance switch third contact, the start button, the stop button, the local stop button, the local emergency stop button and the contactor are connected in series, the local start button is connected in parallel with the start button, the first control relay is connected in parallel with the contactor, the first maintenance switch first contact and the first maintenance switch second contact are connected in series, the first control relay third auxiliary contact and the first maintenance switch third contact are connected in parallel, the second control relay and the first maintenance switch third contact are connected in series, the second control relay first auxiliary contact, the maintenance indicator lamp, the first maintenance switch first contact and the first maintenance switch second contact are connected in series, the first control relay second auxiliary contact and the first maintenance switch first contact are connected in parallel, and the first control relay first auxiliary contact and the first maintenance switch second contact are connected in parallel.

[0006] When the start button or the local start button is pressed on the starter, the contactor and the first relay are powered on to drive the motor to run, at this time the first control relay first auxiliary contact, the first control relay second auxiliary contact and the first control relay third auxiliary contact are closed, so that the motor runs normally even if the first maintenance switch first contact, the first maintenance switch second contact and the first maintenance switch third contact are disconnected.

[0007] When the stop button or the local stop button is pressed on the starter, the contactor and the first control relay lose power, and the motor stops running.

[0008] When the motor is running, if an emergency situation is encountered, the local emergency stop button is pressed to stop the motor from running.

[0009] Regardless of whether the motor is started or stopped, since the first maintenance switch first contact, the first maintenance switch second contact and the first maintenance switch third contact are in a closed state, the second control relay is always powered on, and the second control relay first auxiliary contact connected in series with the maintenance indicator lamp on the starter is in an open state, so the maintenance indicator lamp is always not lit, and there is no maintenance operation at this time.

[0010] When the motor is in the stop state, and the motor is to be repaired, since the first control relay loses the electricity, the first control relay second auxiliary contact, the first control relay first auxiliary contact, the first control relay third auxiliary contact parallel to the first maintenance switch first contact, the first maintenance switch second contact and the first maintenance switch third contact are in the open state, when the first maintenance switch first contact, the first maintenance switch second contact and the first maintenance switch third contact are turned to the open state, the first maintenance switch first contact and the first maintenance switch second contact will completely cut off the motor control loop, the motor will never start, the first maintenance switch third contact is open, the second control relay loses the electricity, and the second control relay first auxiliary contact in series with the starter maintenance indicator is in the closed state, the maintenance indicator is bright, at this time the motor is in the maintenance process.

[0011] The motor starter control loop system with the maintenance switch of the application has the advantages that the maintenance switch is only used in maintenance, and is arranged locally to the motor, which is convenient to operate; the maintenance switch is configured with two contacts in the main control loop, which reduces the failure rate of the maintenance switch itself, and can be locked to ensure that other personnel cannot operate, thereby increasing the safety of the maintenance personnel work; when the maintenance switch contact is open, there is a maintenance indicator at the starter, and other personnel also know that the motor is in the maintenance process, so misoperation is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic diagram of the motor starter control loop system with the maintenance switch of the application.

[0013] In the figure: 1, start button; 2, local start button; 3, stop button; 4, local stop button; 5, local emergency stop button; 6, contactor; 7, first control relay; 8, first control relay first auxiliary contact; 9, first control relay second auxiliary contact; 10, first control relay third auxiliary contact; 11, second control relay; 12, second control relay first auxiliary contact; 13, indicator; 14, maintenance indicator; 15, first maintenance switch first contact; 16, first maintenance switch second contact; 17, first maintenance switch third contact. DETAILED DESCRIPTION

[0014] As Figure 1The motor starter control circuit system with maintenance switch shown, including start button 1, local start button 2, stop button 3, local stop button 4, local emergency stop button 5, contactor 6, first control relay 7, first control relay first auxiliary contact 8, first control relay second auxiliary contact 9, first control relay third auxiliary contact 10, second control relay 11, second control relay first auxiliary contact 12, indicator light 13, maintenance indicator light 14, first maintenance switch first contact 15, first maintenance switch second contact 16 and first maintenance switch third contact 17, the start button 1, stop button 3, local stop button 4, local emergency stop button 5 and contactor 6 in series, the local start button 2 and start button 1 in parallel, the first control relay 7 and contactor 6 in parallel, the first control relay third auxiliary contact 10 and the first maintenance switch third contact 17 in parallel, the second control relay 11 and the first maintenance switch third contact 17 in series, the second control relay first auxiliary contact 12, maintenance indicator light 14, first maintenance switch first contact 15 and first maintenance switch second contact 16 in series, the first control relay second auxiliary contact 9 and the first maintenance switch first contact 15 in parallel, the first control relay second auxiliary contact 8 and the first maintenance switch second contact 16 in parallel, in the normal operation, because the first maintenance switch first contact 15, the first maintenance switch second contact 16 and the first maintenance switch third contact 17 are all in the closed state, the circuit at this time is similar to the conventional electrical equipment start-stop control circuit, when pressing the start button 1 or pressing the local start button 2 on the starter, the contactor 6 and the first control relay 7 are powered on, driving the motor to run, it can be seen that the first control relay first auxiliary contact 8, the first control relay second auxiliary contact 9 and the first control relay third auxiliary contact 10 are connected in parallel to the first maintenance switch second contact 16, the first maintenance switch first contact 15 and the first maintenance switch third contact 17, because the first relay 7 is powered on, the first control relay first auxiliary contact 8, the first control relay second auxiliary contact 9 and the first control relay third auxiliary contact 10 are closed, at this time, even if the maintenance switch is opened, it will not affect the operation of the motor, that is, when the motor is in the running state, the maintenance switch is bypassed and does not work, when pressing the stop button 3 or the local stop button 4 on the starter, the contactor 6 and the first control relay 7 lose power, controlling the motor to stop, in the process of motor operation, if an emergency occurs, the local emergency stop button 5 can also be pressed to stop the motor, in the above normal operation, whether the motor is in the start-up or stop state, because the first maintenance switch first contact 15, the first maintenance switch second contact 16 and the first maintenance switch third contact 17 are all in the closed state, the second control relay 11 is always powered on,The first auxiliary contact 12 of the second control relay in series with the maintenance indicator light 14 on the starter will be in the open state, and the maintenance indicator light 14 will not be on all the time, indicating that there is no maintenance operation at this time; when the motor is in a stopped state and needs to be maintained, the second auxiliary contact 9, the first auxiliary contact 8 and the third auxiliary contact 10 of the first control relay in parallel to the first contact 15, the second contact 16 and the third contact 17 of the first maintenance switch will be in the open state due to the power loss of the first control relay 7, and when the maintenance switch is turned to the open state at this time, the first contact 15 and the second contact 16 of the first maintenance switch will completely cut off the motor control circuit, and the motor will never be able to start, the third contact 17 of the first maintenance switch is open, the second control relay 11 loses power, and the first auxiliary contact 12 of the second control relay in series with the maintenance indicator light 14 on the starter will be in the closed state, and the maintenance indicator light 14 will be on, prompting other personnel that the motor is in the maintenance process at this time. Through the above operation process, the operation of the maintenance switch will not affect the operation of the motor when the motor is already running; when the motor is in the maintenance state, the control circuit of the motor is completely cut off by the two contacts of the maintenance switch, and even if one of the contacts fails, the motor cannot start, which is very safe, and at this time, the maintenance indicator light on the starter will be on to remind other personnel.

Claims

1. A motor starter control circuit system with a service switch, characterized by: The starting button, local starting button, stopping button, local stopping button, local emergency stopping button, contactor, first control relay, first control relay first auxiliary contact, first control relay second auxiliary contact, first control relay third auxiliary contact, second control relay, second control relay first auxiliary contact, indicator lamp, maintenance indicator lamp, first maintenance switch first contact, first maintenance switch second contact and first maintenance switch third contact, the starting button, stopping button, local stopping button, local emergency stopping button and contactor are in series, the local starting button is in parallel with the starting button, the first control relay is in parallel with the contactor, the first maintenance switch first contact and the first maintenance switch second contact are in series, the first control relay third auxiliary contact is in parallel with the first maintenance switch third contact, the second control relay is in series with the first maintenance switch third contact, the second control relay first auxiliary contact, maintenance indicator lamp, first maintenance switch first contact and first maintenance switch second contact are in series, the first control relay second auxiliary contact is in parallel with the first maintenance switch first contact, the first control relay first auxiliary contact is in parallel with the first maintenance switch second contact, the series branch of the first maintenance switch first contact and the first maintenance switch second contact is in series with the series branch of the first maintenance switch third contact and the second control relay, the series branch of the first maintenance switch first contact and the first maintenance switch second contact is in series with the series branch of the starting button, stopping button, local stopping button, local emergency stopping button, contactor, the series branch of the first maintenance switch third contact and the second control relay is in parallel with the series branch of the starting button, stopping button, local stopping button, local emergency stopping button, contactor.

2. An electric motor starter control circuit system with a service switch according to claim 1, characterized in that: When the starting button or the local starting button is pressed on the starter, the contactor and the first control relay are powered on to drive the motor to run, at this time the first control relay first auxiliary contact, the first control relay second auxiliary contact and the first control relay third auxiliary contact are closed, even if the first maintenance switch first contact, the first maintenance switch second contact and the first maintenance switch third contact are open, the motor still runs normally.

3. An electric motor starter control circuit system with a service switch according to claim 1, characterized in that: When the stopping button or the local stopping button is pressed on the starter, the contactor and the first control relay lose power, and the motor stops running.

4. An electric motor starter control circuit system with a service switch according to claim 1, characterized in that: When the motor is running, press the local emergency stopping button to stop the motor running in case of emergency.

5. An electric motor starter control circuit system with a service switch according to claim 1, characterized in that: Whether the motor starts running or stops, since the first maintenance switch first contact, the first maintenance switch second contact and the first maintenance switch third contact are in the closed state, the second control relay is always powered on, the second control relay first auxiliary contact in series with the maintenance indicator lamp on the starter is in the open state, and the maintenance indicator lamp is always not lit, at this time there is no maintenance operation.

6. An electric motor starter control circuit system with a service switch according to claim 1, characterized in that: When the motor is in the stop state, and the motor is to be repaired, since the first control relay loses power, the first control relay second auxiliary contact, the first control relay first auxiliary contact, and the first control relay third auxiliary contact connected in parallel to the first repair switch first contact, the first repair switch second contact, and the first repair switch third contact are in the open state. When the first repair switch first contact, the first repair switch second contact, and the first repair switch third contact are turned to the open state, the first repair switch first contact and the first repair switch second contact completely cut off the motor control loop, and the motor will never start. The first repair switch third contact is open, the second control relay loses power, and the second control relay first auxiliary contact connected in series with the starter maintenance indicator light is in the closed state. The maintenance indicator light is on, and the motor is in the maintenance process at this time.

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