Tarlvin Randall I am so glad I can help, I know it is hard for some of you guys out there all over the world to get to a class. Keep tuned and I hope to have more videos for you!
Thank you so much! I enjoy doing this and I like passing the information or knowledge to other guys because I know how it is out there, a lot of times it's hard to get someone to explain things to you. Thank you very much keep learning and good luck out there!
Brilliant summary. I'm trying to better understand the theory of how these motors are designed. Am I correct to say that the resistance of the start winding is higher, but the inductance of the start winding is lower than the run winding? Why is the inductance of the run winding so much higher? Is it designed that way to allow high current to quickly flow into the start winding, unfettered by impedance pushback. Then once the motor reaches speed, you want to route power through the more durable and more powerful windings of the run coil? I do understand how a phase shift added by those capacitors to the start circuit allows the motor to spool up with more torque. I get the way current flows antegrade, even though the voltage drop across the start winding is so high after back EMF pushes back, mainly because the back EMF is out of phase with incoming current. Is it fair to say that the reason the capacitance of the run cap is so much smaller is to balance incoming current, yet increase impedance, reducing current flowing through the more fragile start windings once the motor is at full speed (Z=1/(2pifC)?
Thank you for your message, and your questions. The start winding in a motor has more windings and more resistance than the run winding, because of the wire is smaller in gauge. There are more turns in the start winding and because of the increase amount of turns the inductance increases. The start winding has higher inductance than the run winding, and that is because of the amount of turns. On start up because of the amount of turns in the start winding, the start winding would have a stronger magnetic field then the run winding. This will start the rotation of the motor and depending on the polarity of the start winding we can dictate whether the motor will have a clockwise or counterclockwise rotation. As the motor picks up speed you can say the inductance kicks in. One of the reasons they use smaller wire and a capacitor in the start winding is to get a phase shift so the motor can keep the rotor rotating. I would say that the capacitance of the run capacitor is to increase the power going to start winding and help with the phase shift. When we talk about farads or microfarads, we are talking about the actual electrons/current that are going through the capacitor. The higher the microfarads the more electrons/current that will go through the start winding. Of course, the more current the stronger the magnetic field is going to be and the more heat that will be generated. This is why we have run and start capacitors. Start capacitors are much higher in microfarads and because of that they will give your start winding more torque, but they are removed at 75% of the motor speed, so as to keep that current down and keep the start winding from overheating and burning up. Unfortunately, there is so much to all of this that this discussion could go on forever it seems like! I hope this makes sense. And I hope this explains your questions. Please feel free to let me know what you think. Thank you
10:51 at this point in video, the diagram shows that the star winding is energized via the Run Capacitor, isn't it ? What then de-energizes the Start winding / I'm at a lost how it is disconnected at 75% Max RPM. Please adivse . thank you for you very informative presentation. Regards.
Good question! In the motor that I am talking about, the start whining stays energized as long as the motor runs. It is called the start winding because it is used to get the motor started. You mentioned 75% of the motor speed. That is when the start capacitor gets taken out of the circuit. To do this they use the potential relay or a starting relay. I believe I have a video that talks about these. On some motors they do de-energize to start whining but in this field for what we do the start winding does not get taken out of the circuit until the motor shuts off. I hope this explains it. If not please let me know!
Not anymore! Years ago, and I'm talking about 25 or 30 years ago that was important. On the new capacitors you do not have to worry about that whether you're talking about a run capacitor or a start capacitor. Please be very careful because some people get the capacitors that are good for the compressor and the fan confused with the start capacitor. Those fans capacitors that have, or are labeled common, fan and Herm, it makes a difference how you hook them up. With those you must be very very careful.!!! Good luck!
Very good question!!! The capacitor supplies the power needed to give the compressor motor more torque. If the capacitor stays energized the motor will overheat and go out on internal overload or it could possibly burn out!!!
Hello, you introduced a centrifugal switch at the end. Is this internal to the compressor? would adding a hard start kit to a system with the centrifugal switch be redundant? ty
The centrifugal switch is typically only used on Motors and not on compressors. The switch will take the start capacitor out of the circuit. The Hard start kit is basically the same thing as what was described in the video. The hard start kit is basically a start capacitor and a solid-state relay to take it out of the circuit at 75% of the motor speed. I hope this answers your question.
@@toolemanful yes, the run capacitor always feeds to start winding, the start capacitor also feeds the start winding. Basically they are named for what they do. The start capacitor is used on start up and the run capacitor is used while the unit is running. I hope this makes sense. Thank you for the question.
@@toolemanful I'm glad I could help. I was till all of my students to check and double check when you are told something, even when I tell them something. I want them to be sure that they are being told the correct thing. Thank you for your question and keep learning out there!
Yes, that will happen. Start capacitors are only supposed to be working until the compressor/motor reaches 75% of its operating speed. At that time either the centrifugal switch or the potential relay or the current relay will take it out of the circuit. If this does not happen, if it is not removed from the circuit you will have a high average condition and the motor could overheat and tripped out on internal overload. I hope this explains it. Thank you for your question.
the Start and Run capacitors operate at the same time on start up. They both are feeding power to the start winding until 75% of the motor speed. the capacitor gets the power from the same line that feed the run wining, and then the start capacitor is removed from the circuit.
Correct it is called run capacitor because it is used only when it is running, the start it is called start because it is used only on start. Please make sure you subscribe to my channel.
Luis Romero Yes, the capacitors always feed the start winding. And the capacitors are labeled for what they do. For example the run capacitor works when the compressor is running. The start capacitor works when the compressor starts.
Yes it does shift the angle of the Phase and it does this by storing energy and then releasing it. This creates a delay so you have a phase shift. Both start capacitors, run capacitors and all capacitors store and release energy. The question is how long does it take to charge and discharge. This determines how much of a phase shift there will be. I hope this explained what I was trying to say a bit better.
great tutorial, i've worked on these type of motor changing caps and pot relays in the past. its nice to see someone explain these things well
Thank you! Thank you for your comment and thank you for watching!
Julio, Sir I can't thank you enough for these valuable lessons
Tarlvin Randall I am so glad I can help, I know it is hard for some of you guys out there all over the world to get to a class. Keep tuned and I hope to have more videos for you!
Thankfully for your knowledge and passion for teaching.
Thank you so much! I enjoy doing this and I like passing the information or knowledge to other guys because I know how it is out there, a lot of times it's hard to get someone to explain things to you. Thank you very much keep learning and good luck out there!
Very good quality of teasing. Covering every little details. Understanding very easyli. Thanks.
Excellent! I've been wondering/confused about this through 3 TH-cam instructors.
Thank you! I'm glad I could help. Keep watching and keep learning!
Brilliant summary. I'm trying to better understand the theory of how these motors are designed. Am I correct to say that the resistance of the start winding is higher, but the inductance of the start winding is lower than the run winding? Why is the inductance of the run winding so much higher? Is it designed that way to allow high current to quickly flow into the start winding, unfettered by impedance pushback. Then once the motor reaches speed, you want to route power through the more durable and more powerful windings of the run coil? I do understand how a phase shift added by those capacitors to the start circuit allows the motor to spool up with more torque. I get the way current flows antegrade, even though the voltage drop across the start winding is so high after back EMF pushes back, mainly because the back EMF is out of phase with incoming current. Is it fair to say that the reason the capacitance of the run cap is so much smaller is to balance incoming current, yet increase impedance, reducing current flowing through the more fragile start windings once the motor is at full speed (Z=1/(2pifC)?
Thank you for your message, and your questions.
The start winding in a motor has more windings and more resistance than the run winding, because of the wire is smaller in gauge. There are more turns in the start winding and because of the increase amount of turns the inductance increases.
The start winding has higher inductance than the run winding, and that is because of the amount of turns.
On start up because of the amount of turns in the start winding, the start winding would have a stronger magnetic field then the run winding. This will start the rotation of the motor and depending on the polarity of the start winding we can dictate whether the motor will have a clockwise or counterclockwise rotation. As the motor picks up speed you can say the inductance kicks in. One of the reasons they use smaller wire and a capacitor in the start winding is to get a phase shift so the motor can keep the rotor rotating.
I would say that the capacitance of the run capacitor is to increase the power going to start winding and help with the phase shift. When we talk about farads or microfarads, we are talking about the actual electrons/current that are going through the capacitor. The higher the microfarads the more electrons/current that will go through the start winding. Of course, the more current the stronger the magnetic field is going to be and the more heat that will be generated. This is why we have run and start capacitors. Start capacitors are much higher in microfarads and because of that they will give your start winding more torque, but they are removed at 75% of the motor speed, so as to keep that current down and keep the start winding from overheating and burning up.
Unfortunately, there is so much to all of this that this discussion could go on forever it seems like! I hope this makes sense. And I hope this explains your questions. Please feel free to let me know what you think. Thank you
@@AirConAcademy Thank you, that makes a lot of sense.
Good day sir.very clear explanation...stay safe always and God bless
Thank you so much for your kind words! I'm glad you like the video!!!
All of your videos are really nice and more knowledgable. Thankyou sir
Thank you!!!! I hope it will help you.
Like always Julio. Thank you for your teaching, is very instructive , hope you keep making more of this, God bless
Thank you!!!
Great presentation, thanks for sharing your knowledge. I love how you explain things.
Thank you!!! please make sure you subscribe!!!
Awesome 👍 thank you for sharing sir. I'm from Iran
From Iran? thank you for letting me know!!!
امیدوارم همه چیز خوب باشه.
One video for current relay and the difference between current and potential relays would be nice. Very nice video.
Great suggestion!!! thank you and thank you for watching!!!!
VERY INSTRUCTIVE THANK YOU VERY MUCH FOR YOUR TEACHING,GOD BLESS
Thank you, I need all of the blessings I can get!
10:51
at this point in video, the diagram shows that the star winding is energized via the Run Capacitor, isn't it ?
What then de-energizes the Start winding /
I'm at a lost how it is disconnected at 75% Max RPM.
Please adivse .
thank you for you very informative presentation.
Regards.
Good question! In the motor that I am talking about, the start whining stays energized as long as the motor runs. It is called the start winding because it is used to get the motor started. You mentioned 75% of the motor speed. That is when the start capacitor gets taken out of the circuit. To do this they use the potential relay or a starting relay. I believe I have a video that talks about these. On some motors they do de-energize to start whining but in this field for what we do the start winding does not get taken out of the circuit until the motor shuts off. I hope this explains it. If not please let me know!
Dear sir i like your explanation.
How do you test these potential relay while on circuit to troubleshoot,?
Do I need to pay attention on the direction when I install the run cap or the start cap?
Not anymore! Years ago, and I'm talking about 25 or 30 years ago that was important. On the new capacitors you do not have to worry about that whether you're talking about a run capacitor or a start capacitor. Please be very careful because some people get the capacitors that are good for the compressor and the fan confused with the start capacitor. Those fans capacitors that have, or are labeled common, fan and Herm, it makes a difference how you hook them up. With those you must be very very careful.!!! Good luck!
@@AirConAcademy thx
Hi. Thanks for the video .. what happen to the compresor if the potencial relay doesnt take the start capacitor off ... thanks
Very good question!!! The capacitor supplies the power needed to give the compressor motor more torque. If the capacitor stays energized the motor will overheat and go out on internal overload or it could possibly burn out!!!
Outstanding explanation, thanks
Hello, you introduced a centrifugal switch at the end. Is this internal to the compressor? would adding a hard start kit to a system with the centrifugal switch be redundant? ty
The centrifugal switch is typically only used on Motors and not on compressors. The switch will take the start capacitor out of the circuit. The Hard start kit is basically the same thing as what was described in the video. The hard start kit is basically a start capacitor and a solid-state relay to take it out of the circuit at 75% of the motor speed. I hope this answers your question.
Thanks x share your knowledge amigo.
Man this was excellent thanks
Thank you,! I'm glad I could make this video so you could get something out of it. That's why I'm doing this! Take care, keep learning and thank you!
@@AirConAcademy does the run cap always feed the start and not to the run winding
@@toolemanful yes, the run capacitor always feeds to start winding, the start capacitor also feeds the start winding. Basically they are named for what they do. The start capacitor is used on start up and the run capacitor is used while the unit is running. I hope this makes sense. Thank you for the question.
@@toolemanful I'm glad I could help. I was till all of my students to check and double check when you are told something, even when I tell them something. I want them to be sure that they are being told the correct thing. Thank you for your question and keep learning out there!
from Nepal .
Thank you for letting me know!! I am glad you are watching!!!
excellent job
Thank you!!!! glad you liked it!!!
@@AirConAcademy well done
@@glenns9557 Thank you !!!
If start capacitor is disconnected after a while, will load in ampere also fall down drastically?
Yes, that will happen. Start capacitors are only supposed to be working until the compressor/motor reaches 75% of its operating speed. At that time either the centrifugal switch or the potential relay or the current relay will take it out of the circuit. If this does not happen, if it is not removed from the circuit you will have a high average condition and the motor could overheat and tripped out on internal overload. I hope this explains it. Thank you for your question.
Great! Thank you so much!
5-2-1 COMMON-START-RUN :)
yes I have heard that saying before it is a good one!!!
When the motor speed reachs 75percent the SC is out of the circuit and the RC stars. That means RUN capacitor feed the START windings. Wright?
the Start and Run capacitors operate at the same time on start up. They both are feeding power to the start winding until 75% of the motor speed. the capacitor gets the power from the same line that feed the run wining, and then the start capacitor is removed from the circuit.
The short answer: YES
Thanks for you nice video
Thank you!!!
Thanks big times.
Thank you!!!
Symbols help with symbols that my issue it's hard to understand please help thank u
George Garcia Thank you so much for your suggestion. Or request. I will definitely do a video where I talk about symbols! Thank you.
Symbols
👏👏👏👏👏
Took my attention that Run capacitor never feed RUN winding. L2 feed it.
Correct it is called run capacitor because it is used only when it is running, the start it is called start because it is used only on start. Please make sure you subscribe to my channel.
correct either L1 or L2 can feed the run winding BUT the RUN and START capacitor always feeds the START winding.
@@AirConAcademy good clarification
Luis Romero Yes, the capacitors always feed the start winding. And the capacitors are labeled for what they do. For example the run capacitor works when the compressor is running. The start capacitor works when the compressor starts.
XRAY Bravo Thank you!
I was under the impression that a start capacitor the only thing it did was a face shift and did not store any energy
Yes it does shift the angle of the Phase and it does this by storing energy and then releasing it. This creates a delay so you have a phase shift. Both start capacitors, run capacitors and all capacitors store and release energy. The question is how long does it take to charge and discharge. This determines how much of a phase shift there will be. I hope this explained what I was trying to say a bit better.