DOL Starter With Auto Manual Selector Switch and Sensor @ElectricalTechnician

Friends, in today's video, we are going to learn how to wire a contactor and how to start a motor using a start push button and a stop push button. Apart from this, if we want to start this contactor using a sensor, then how to wire it is also going to be explained in detail in this class. Before starting the wiring, let me tell you one more thing. The contactor should start from one of the two start push buttons. This one and this sensor. The contactor should start from one of these two. I need this option here. That means if I press this push button and start the contactor, then the signal should not go through the sensor. The contactor should not start in the contactor through the sensor. And if I start the contactor from the sensor, then the contactor should not start through the push button in this condition. I need this option here. If we need this option, then we will have to use a selector switch in this condition. And this selector switch is our auto and manual selector switch. That means if I put this on manual, then the contactor will start through the start push button. And if I put this selector switch on auto, then our motor will start through this sensor. Friends, before moving ahead, I would like to tell you that if you want to take electrical training from us, then you can join our video course and get good electrical knowledge. Your company, your seniors, your supervisors will teach you work very slowly. It will take a lot of time for you to learn. So if you want to learn electrical work quickly, then you can join our course and learn. I have given the link of all the courses in the description of the video. Apart from this, if you want, you can download our electrical technician app and join the course directly from there and learn. Let's continue the class. Look at my contactor here. The contactor will operate through a 230 volt AC power supply. So in this condition, I will provide a 230 volt AC power supply to this MCB here. For this, I connected the neutral supply and phase supply to the MCB's input terminal. Now we will get the output power supply of this MCB's phase terminal on this terminal. So first of all, I connected the stop push button to the power supply from this terminal. Then I took the power supply from the stop push button and provided the incoming power supply to the selector switch. Please note one thing here. We will switch off both the conditions through this stop push button. Even if we start this contactor through this push button, it will stop when we press this stop button. Apart from this, if I start the contactor through this sensor, the contactor will stop when I press this push button. For this, we have to do the wiring here. So in the current time, I connected the phase supply to the phase terminal of the common terminal of this selector switch through the power supply through the stop push button. Now I will get this power supply on A1 terminal and A2 terminal. I will get power supply on A1 terminal when I select this selector switch from position 1. And I will get power supply on A2 terminal when I select this selector switch from position 2. So in this condition, I will get the output power supply of the phase supply here. So I took a wire from this place and provided the incoming power supply to this push button. Now as soon as we press this push button, we have to start this contactor. So for this, we will take a wire from the output terminal of this push button and connect it directly to the A1 terminal of the contactor. Now we also need neutral supply to operate this contactor. So by connecting the neutral supply from here, we will provide neutral supply directly to the A2 terminal of this contactor. Now what will happen by doing this much wiring? After starting this MCB, when I select this selector switch on manual, then in this condition, the power supply will be provided to this start push button through this wire. Then as soon as we press this, the power supply will flow from here and the power supply will go to the A1 terminal of this contactor. And the coil of this contactor is getting neutral supply directly from here, then our contactor will start. But our contactor will run only till we press the push button. Now if we want our contactor to keep running, as soon as we press the start push button, then in this condition, what we have to do is, by taking a wire from the output terminal of this stop push button, we will connect the phase supply to the anode contact of this contactor. And if we get the output of this phase supply at this place, then by looping a wire from this place, we will provide phase supply to this A1 terminal. This means that our contactor will hold here. Now friends, here we have to do some such wiring, by which this sensor can also start the contactor through this sensor. So what do we have to do to connect this? This selector switch, the output terminal of the position of the number 2 of this selector switch, means that when I select this selector switch at the position of number 2, then the phase supply which is connected here, this phase supply will be found here. I will connect the phase wire of the sensor to that wire terminal. The sensor I have, this sensor is of 2 wires and it works on AC power supply. That's why I connected the brown wire of this sensor to A2 terminal, so that when I select this selector switch at the position of number 2, then this phase supply goes directly to this sensor. And the black wire of this sensor is for the output, so by taking that wire, I connected it directly to this phase supply here. The benefit of this will be that the output generated by this sensor will go directly to the A1 terminal of this contactor, by which our contactor will start through the sensor. Now it started through the sensor, but to close it, we have to press the stop button here. Why is this? Because we have made a holding circuit here, so our contactor will be held through the holding circuit. That means as soon as the target comes in front of the sensor, the contactor will start and it will keep on running. Then we will press the stop button here, then our contactor will be turned off. So friends, through today's small class, you have learned that how to make a dual starter where we will use two different devices to start the contactor and how to wire the selector switch to start the contactor. I have explained it to you in full detail. See you in the next video. Thank you very much for watching this video.