Just finished watching your "what is a VFD?" video and, once again, the explanation was excellent, especially useful was the analogy of the water control pipeline. I started to read up about VFDs on a well-known online encyclopedia and was blinded with science. Your explanation was pitched perfectly and just what I needed as I'm working on updating our PLC to control an inverter for a water pump. Perfect, keep up the good work. Cheers!
Awesome, thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!
The quality and presenataion of these videos is simply amazing, Easy to follow and understand, Thank you so much! I recommend this channel to every engineer/ technician i know :)
Hey! Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!
They do lay down the fundamentals quite well in explaining things in every video fundamentally. I really appreciate that about them as well as the fundamentals help immensely in understanding and they do it in very simple explanation and animation. It’s just awesome.
Thanks for the insightful comparison of electronic components to hydrologic systems . This opened a couple of doors quickly for me. To get an understanding of how a PLC interacts with a VFD has given me some confidence in my new job as a Flexographic printing Mechanic. It is my hope to not only comprehend but to be able to program fully automated six color presses to accommodate changes in production requirements across a wide variety of material and ink types. This work is gratifying and worthwhile for me and your program is now on my radar. Keep up the good work many thanks.
Appreciate this simplified easily accessible explanation. I’m a civil engineer so I need to be familiar with the basic operation of a vfd, despite my lack of education in mechanical and electrical engineering. This video made great sense and has clarified the subject for me significantly. Thank you!!
Dear, please share your knowledge on points 1) How to do wiring , i mean power wiring + control wiring of a VFD and its hook up with PLC 2) What are the configuration settings to be done inside the VFD for Siemens and Allenbradley ones 3) how to build a control logic for the same by using PLC programming. Kindly do the needful. You people are awesome, love u all
Exceptional video lesson with an impeccable subject of a state-of-the-art equipment which is becoming indispensable in the most varied processes. It is fascinating to understand the conversion of AC input energy into DC energy and going out simulating an AC senoid through the width of pulses having the ability to control the speed of electric motors by frequency. Thank you very much and congratulations on the excellent work. I'm from the city of Manaus, in the State of Amazonas, Brazil, country, located right in the middle of the Amazon rainforest, where incredibly there are several of these equipment, and I accompany you.
vfd controls the speed of the motor by converting AC to DC then back to AC with different frequency and it can be wired to plc to make the task automatic and get rid of a stupid operator! can't find any easier and straightforward explanation... GREAT JOB
Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!
Super awesome explanation! Thank you Sir! What a smooth instructor 💯🙌 I treasure this channel now...I rarely come across lucid and well articulated information like this. Thank you!!!💯👍🙌🙌🙌🙌
Sir, in this video you cover most of the part related to the application, please make one video which will give details about the VFD internal functions, which is actually important. Thanks
So far, so good. These days, 3 phase VFD is used for most modern electric trains, and hybrid or full-on electric road vehicles, after the advent of integrated gate bipolar transistors (IGBT). Typically done with triple inverters (one for each phase), capable of working in both directions, for regenerative braking when required, using the 3 phase motor as an alternator.
VFD is a motor drive that controls AC motors, it converts AC into DC using a diode then it filters the current by a capacitor then converts DC into AC using a transistor. What a solid state motor drive
Thank you for your question! It sounds like you’re asking about the difference between a Variable Frequency Drive (VFD) and a solid-state drive. Here’s a quick explanation: VFDs: Primarily used to control the speed and torque of AC motors by adjusting the frequency and voltage of the power supplied. Solid-State Motor Drives: A broader category that includes VFDs but also covers drives for various motor types (AC, DC, and stepper motors). These drives use semiconductor technology to control motor functions. We hope this clarifies things. Happy learning from RealPars!
thank you for very good and useful information. can we use the VFD drive in sewage pumping station? how we calculate the power needs when we use VFD drive?
Hi Nuri, Thanks for your comment and for your feedback! I will happily go ahead and pass your questions on to our course developers as a topic suggestion. Thanks again and happy learning!
Thank you for your question! You’ve raised a good point. In a VFD, we work with a feeder power source, utilizing its voltage, current, and frequency to control the motor's actions. By adjusting these parameters, we can achieve the desired torque during slow startups for heavy loads, preventing motor damage. To get the results we want, we need to program the frequency, voltage, and current parameters accordingly. If you’re a member of our platform, you can learn more about these drives and their general applications. You can check those out over here: www.realpars.com/courses Happy learning!
Got a question! I'm a bit confused. If you start out with AC, why convert it to DC just to convert it again back to AC? What is the difference between the initial AC and the final output AC? What is the reason you can't just use the transistors to control the frequency from the original AC source?
Hi Dave, thank you for your question! In order to change the frequency of the AC sine wave, the incoming supply must be transformed. The most effective way to do this is to convert the current to DC and then reform the AC signal at a different frequency. This process also allows the VFD to maintain a constant Volts/Hz ratio, which is important for maintaining the integrity of the motor windings over a long period of time. Inductive reactance acts as a resistor and can cause excess heat dissipation if the V/Hz ratio is not maintained. Therefore, there are multiple benefits to converting from AC to DC and back to AC, including being able to provide a cleaner (filtered) AC feed to the motor. Hope this helps, and happy learning!
Great to hear that! Welcome to the RealPars family! If you have any questions, feel free to leave them in the comment section. Just to let you know, that we also have a free course on PLC Hardware bit.ly/2XnnUrF Happy learning!
You could try, but it is best to use a reciprocating or positive displacement type pump to induce pulsating flow. These types of pumps are usually not controlled by a VFD.
Informative video! Suppose we have a traditional inductive motor with maximum 1400 RPM, then we connect that motor to a VFD, here is the question: Does it possible to increase the RPM of the same motor more than 1400 RPM by increasing the frequency? And does the power consumption will increase?
It is possible to overspeed a motor by setting the frequency above the nameplate frequency. However, motor torque will start to decrease above 100% speed. This occurs because the faster speed leads to increased slip, which robs the motor of torque and converts the excess energy into heat and efficiency loss. Overspeeding a motor is sometimes done with fans, but there can be adverse effects of doing so. Power consumption depends on the loads that are connected to the motor.
@@realpars In my case it's a water pump one horse power 746 watts, my plan to make a basic inverter or a soft starter circuit in order to run that motor on UPS 12/220v--1200 watts,but I face problem that my UPS circuit breaker cutting off due to rough start
Technically, if the VFD has the option for auto-tuning, you can configure auto-tuning for whatever KW rating the VFD is rated for. Practically speaking, since auto-tuning is performed to improve the efficiency of the motor performance, tangible (measurable) benefits will not likely be seen for motors less than 5Hp (3.275kW).
Thanks for the video this just made my idea of a off grid induction motor and centrifugal pump to pressurize the water to drive pelton turbines for my hydro electric system a reality for my bitcoin mining operation, simply put much like the video i was wondering how i could control the pump speed for pressure to drive the pelton turbines to have more control on the overal out put of the generators also the electric motor is also powered by the same generators currently figuring out how to switch power sources for shutdowns for maintenance purposes where i would have to hydro systems to switch between to service but maintain electricity.
Sir...I checked vfd incoming current that's value is 10 amps...but when checked vfd outgoing (motor side) then value shows 30 amps... That means vfd saving power...but my question is...what phenomenon happen in vfd that's reason outgoing current is greater than incoming current.
I am guessing the incoming power is 480 VAC and the output of the VFD is 240 VAC. Power = V x A, so if the power output of the motor is constant, if Volts is cut in half, Amps will double. That is a little simplistic, but you get the relationship. Also, a VFD keeps the Volts/Hertz ratio nearly constant at the output, so a slow-running motor that has to generate a lot of torque will pull a lot of amps. That is why we use overloads on the motor leads (or use the internal current limiting function in the VFD configuration). Lastly, make sure you are measuring the amps on the VFD output correctly and correcting for 2-phase versus 3-phase operation. I would need to know the exact model number of the VFD to provide any further analysis.
If I want to control a VFD (eg for controlling water flow of a pump) from a PLC, do I need to connect the VFD wires to an analogue input card or analogue output? I think it needs to be an output card, right? Because you need to tell the VFD to either increase or decrease flow rate. So should it connect to an analogue output card?
Yes, you will need to provide an analog output signal from the PLC and wire it to the reference speed input (setpoint) of the VFD. The value of this output will represent % Speed.
A residual current circuit protection device interrupts a circuit in the event of a VFD malfunction. The RCCD measures the incoming and outgoing current of a device or system, and if these two currents are not identical, it will interrupt the circuit. It is essentially a ground fault detector. Personally, I have not used RCCDs with VFD installations, as most modern VFDs can detect internal current faults on their own.
Hi there, Thank you for your question. You can dedicate one VFD for one motor matching the voltage and current requirements. And you can add more than one motor to the VFD, but all motors will run at the same speed since the same VFD controls them. It’s a little more technical than it sounds. A quick answer is; if I have a 100 KW VFD, I can run 10 of 10 KW motors to one VFD. Please see the link below to help you understand more. www.automation.com/en-us/articles/2011-1/vfds-can-control-multiple-motors Happy learning!
@@scottsommer5450 Hello Sir, when i read the vdf delta datasheet, the common settings for V/F Curve for general purpose has min frequency 1.3 hz and 10V while max is 50hz and 220V. currently i set the setting like this but 220 change to 380V. I need low rpm for drawing minimal chemical flow
@@chickenz4604 Sorry, I just saw your question. What setting did you adjust? Which parameter changed to 380V? Normally, you would just need to input the motor nameplate data into the appropriate VFD parameters and set the output for the Hz value you need. The VFD does the rest. I will say that 1.3Hz / 10V is very low, and may be outside the limits of your specific VFD.
Hii this is Swathi from India Did u heard about SFC and FCMA starters If you did please make a video on them..and i must tell you your channel content is so helpful to my work.. thank you ☺️
Thank you for your question. Yes, it can do that. But depending on your motor type and VDF used, you must size it according to the torque requirements you are looking for. Your local vendor should be able to help you size your VFD and motor. Happy learning!
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Just finished watching your "what is a VFD?" video and, once again, the explanation was excellent, especially useful was the analogy of the water control pipeline. I started to read up about VFDs on a well-known online encyclopedia and was blinded with science. Your explanation was pitched perfectly and just what I needed as I'm working on updating our PLC to control an inverter for a water pump. Perfect, keep up the good work. Cheers!
Awesome, thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback!
If you ever have any questions, feel free to reach out to us.
Happy learning!
Thankyou gues shering
The quality and presenataion of these videos is simply amazing, Easy to follow and understand, Thank you so much! I recommend this channel to every engineer/ technician i know :)
Hey!
Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us.
Happy learning!
11
Always starting with the principles to create a strong foundation. That's what I like about your videos.
Thanks for sharing your positive feedback! Great to hear.
They do lay down the fundamentals quite well in explaining things in every video fundamentally. I really appreciate that about them as well as the fundamentals help immensely in understanding and they do it in very simple explanation and animation. It’s just awesome.
I'm an Electrical Engineer, your description is perfect.
Thanks for sharing, Gary!
Thanks for the insightful comparison of electronic components to hydrologic systems . This opened a couple of doors quickly for me. To get an understanding of how a PLC interacts with a VFD has given me some confidence in my new job as a Flexographic printing Mechanic. It is my hope to not only comprehend but to be able to program fully automated six color presses to accommodate changes in production requirements across a wide variety of material and ink types. This work is gratifying and worthwhile for me and your program is now on my radar. Keep up the good work many thanks.
Thanks for your comment, Jeffrey!
The world is quiet here..
Appreciate this simplified easily accessible explanation. I’m a civil engineer so I need to be familiar with the basic operation of a vfd, despite my lack of education in mechanical and electrical engineering. This video made great sense and has clarified the subject for me significantly. Thank you!!
Thank you so much, @ScabbyBoi! We're glad you found it helpful!
Dear, please share your knowledge on points 1) How to do wiring , i mean power wiring + control wiring of a VFD and its hook up with PLC 2) What are the configuration settings to be done inside the VFD for Siemens and Allenbradley ones 3) how to build a control logic for the same by using PLC programming. Kindly do the needful. You people are awesome, love u all
Hi Hara!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Best animation video on youtube.
Thanks a million, great to hear that!
Exceptional video lesson with an impeccable subject of a state-of-the-art equipment which is becoming indispensable in the most varied processes.
It is fascinating to understand the conversion of AC input energy into DC energy and going out simulating an AC senoid through the width of pulses having the ability to control the speed of electric motors by frequency.
Thank you very much and congratulations on the excellent work.
I'm from the city of Manaus, in the State of Amazonas, Brazil, country, located right in the middle of the Amazon rainforest, where incredibly there are several of these equipment, and I accompany you.
Our pleasure! Thank you very much for your kind comment, and for sharing that with us.
Happy learning!
vfd controls the speed of the motor by converting AC to DC then back to AC with different frequency and it can be wired to plc to make the task automatic and get rid of a stupid operator! can't find any easier and straightforward explanation... GREAT JOB
Thanks a million for your kind comment, Yousfi! We appreciate your support.
I am from India. It is easy to understand why used vfd. Thank u so much 😍
Glad to hear that!
most important informative channel i've seen in my career proud to be a follower many thanks
Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback!
If you ever have any questions, feel free to reach out to us. Happy learning!
Explanation is flawless.
That is amazing to hear, thanks for sharing that with us!
Super awesome explanation! Thank you Sir! What a smooth instructor 💯🙌 I treasure this channel now...I rarely come across lucid and well articulated information like this. Thank you!!!💯👍🙌🙌🙌🙌
Thanks for your support! Happy to hear that.
I NEVER comment but I’vegot to say best video explanation ever. Good job, you got me as subscriber
Thanks a million, Jose! We truly appreciate that.
Easy to get information and difficult to forget it
Thanks a lot
That's great to hear! You are very welcome.
Sir, in this video you cover most of the part related to the application, please make one video which will give details about the VFD internal functions, which is actually important.
Thanks
Hi there, thanks for your comment! I will send your request through to our creator team.
Thanks for excellent and clear explanation
You are welcome!
Widely used as well in HVAC, especially in FAHUs, AHUs, and Chilled Water Pumps.
Very clear explained about vfd. Thanks alot
Glad it was helpful!
Very useful and perfectly explained. Thank you!
Glad you enjoyed it! Happy learning
Thanks for the video real pars.
Pls show a video on how to use a PLC to control the consumer unit of a residential building.
Thanks
Hi Dennis!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Sir your video is wonderful
Happy to hear that, Mansoor! Thank you!
The check valve (2:06) is drawn backwards. It will not allow flow in the direction animated in the video.
Guys those people are really awesome isn't it😍
Good Channel broo, greeting from Indonesia ~
Thank you, Lutfi!
Sir your videos are just great
Thanks a lot.
Thanks for your compliment, Shinoda!
謝謝！
Thank you very much!
So far, so good. These days, 3 phase VFD is used for most modern electric trains, and hybrid or full-on electric road vehicles, after the advent of integrated gate bipolar transistors (IGBT). Typically done with triple inverters (one for each phase), capable of working in both directions, for regenerative braking when required, using the 3 phase motor as an alternator.
Hi John,
Thanks for sharing your knowledge with us! We always appreciate that.
One the money with this comment
The best sounding VFD’s are found on Siemens locomotives like the BR 182 and BR 406 etc.
thanks for amazing presentation , i,m a water treatment technecian .. good works REAL PARS
Very useful video.
Thank you for existing.
Glad it was helpful! Happy learning
VFD is a motor drive that controls AC motors, it converts AC into DC using a diode then it filters the current by a capacitor then converts DC into AC using a transistor. What a solid state motor drive
Thank you for your question! It sounds like you’re asking about the difference between a Variable Frequency Drive (VFD) and a solid-state drive. Here’s a quick explanation:
VFDs: Primarily used to control the speed and torque of AC motors by adjusting the frequency and voltage of the power supplied.
Solid-State Motor Drives: A broader category that includes VFDs but also covers drives for various motor types (AC, DC, and stepper motors). These drives use semiconductor technology to control motor functions.
We hope this clarifies things. Happy learning from RealPars!
@@realpars thank you a lot ❤️
Very useful ❤
Glad to hear that!
I work for a major American city's, public works department, and Plc's and scada systems, and even one vfd system is in use.
Nice video..
Many thanks for RealPars for spreading technical knowledge with better and simple animation..
Thank you..
Thanks for your positive comment! Happy to hear that. Happy learning!
^^ Thanks RealPars, this is a good intro video. Great water animation on the discharge of that pump also, nice :)
Thanks for your support! Great to hear that.
We use VFD on boarding bridges at my job Great information great explanations
Glad it was helpful! Thanks for sharing your positive feedback
Excellent information. Thanks!
Glad it was helpful!
iam studying Engineering on electronics and instrumentation , your tutorials are helpful to me.
Great to hear that! Keep up the learning curve! Let us know if you have any questions.
Hello..
Bro.. your videos are very informative and helpful.
Thank you!
Good and easy to understand
Great!
Maybe you can visit our store to find what you need or ask for help:topstock.aliexpress.com
Really straight-forward and simple; awesome explanation!
Great to hear that! Thanks for your support.
Very informative. Needed to touch up my understanding of one when I wondered as I was supplying line voltage to one. I never fully understood them.
Great to hear! Keep up the good learning :)
Kindly make a video comparison between VFD vs Soft starter
Thank you! We have this topic on our list, hopefully, it will be up soon!
I think they are basically the same thing.
Thanks. It was so much easy and explained well. 👍now vfd concept is clear to me
You are very welcome! Thanks for your support.
Thankyou for this. I finally understood how IGBT works on VFD's. God bless this channel
Great to hear, Jeramel. Keep up the good learning!
Perfect explanation
Glad you liked it
Great work!
Thank you!
This is the backbone of power electronics
Keep these videos coming. Thanks
Thank you! We will. Happy learning!
thank you for very good and useful information.
can we use the VFD drive in sewage pumping station?
how we calculate the power needs when we use VFD drive?
Hi Nuri,
Thanks for your comment and for your feedback!
I will happily go ahead and pass your questions on to our course developers as a topic suggestion.
Thanks again and happy learning!
Its a very good explanation
That's great to hear, Silvia!
Thanks for sharing and happy learning!
Thank you for video. Please tell me 03:58 why you have higher frequency and slowly rotation?
Thank you for your question! You’ve raised a good point. In a VFD, we work with a feeder power source, utilizing its voltage, current, and frequency to control the motor's actions. By adjusting these parameters, we can achieve the desired torque during slow startups for heavy loads, preventing motor damage. To get the results we want, we need to program the frequency, voltage, and current parameters accordingly.
If you’re a member of our platform, you can learn more about these drives and their general applications. You can check those out over here: www.realpars.com/courses
Happy learning!
Glad to know what I'm resetting at work lol, I really want to learn how all the stuff I use at work works and found your videos super informative!
Glad to hear that our video course was helpful to you, Noah! Happy learning.
Awesome job! Love these presentations. I will be building a Tumbler operating using a VFD controller on the motor. I am making a video of it now too.
Thank you, Clint!
Nice Explanation
Thanks and welcome!
Very good
Please change the direction of the check valve as it was reversely installed
great presentation, the best i have seen please keep them coming thanks.
Thanks a lot for your support!
Such a great video! Thank you so much.
Glad it was helpful! You're very welcome
Got a question! I'm a bit confused. If you start out with AC, why convert it to DC just to convert it again back to AC? What is the difference between the initial AC and the final output AC? What is the reason you can't just use the transistors to control the frequency from the original AC source?
Hi Dave, thank you for your question!
In order to change the frequency of the AC sine wave, the incoming supply must be transformed. The most effective way to do this is to convert the current to DC and then reform the AC signal at a different frequency. This process also allows the VFD to maintain a constant Volts/Hz ratio, which is important for maintaining the integrity of the motor windings over a long period of time. Inductive reactance acts as a resistor and can cause excess heat dissipation if the V/Hz ratio is not maintained. Therefore, there are multiple benefits to converting from AC to DC and back to AC, including being able to provide a cleaner (filtered) AC feed to the motor.
Hope this helps, and happy learning!
Great channel keep on 👍🏻👍🏻👍🏻👍🏻🌹
Thank you, Sultan!
Very informative video. Thank you! New subscriber here. Im a student in automation and its very helpful for me now as we make our thesis :)
Great to hear that! Welcome to the RealPars family!
If you have any questions, feel free to leave them in the comment section.
Just to let you know, that we also have a free course on PLC Hardware bit.ly/2XnnUrF
Happy learning!
Same for me. Very clear and helpful
At 2:08, is the check valve symbol in the correct orientation? I thought the "eye" always looked in the direction of allowed flow. Thanks.
You are correct. The orientation of the check valve is reversed if the flow is from left to right.
very fascinating description indeed
Thank you, Andrew!
Good job,now it's easy to understund
Great!
Thank you. Helps me a lot in understanding what is VFD.
Great to hear that, Ahmad! Happy learning.
@@realpars hjhfyc6fdgitd6d6dugdutucgdtd7tx7cucjgdutcutddjttucutcudtudtudtuddu
Great video!!
Thank you!
dear sir can we use this motor for inducing pulsatile flow of fluid in a tube
You could try, but it is best to use a reciprocating or positive displacement type pump to induce pulsating flow. These types of pumps are usually not controlled by a VFD.
A Very Fine Video. about a Variable Frequency Drive. Possibly used by......
Great to hear! :) Happy learning.
Informative about VFD. Thanks
keep your opinions to yourself.
Thanks for this video , it's easy to understand
Great to hear!
Respected Sir. Nice Video .We needs more vfd video..
Thanks a lot!
Informative video! Suppose we have a traditional inductive motor with maximum 1400 RPM, then we connect that motor to a VFD, here is the question: Does it possible to increase the RPM of the same motor more than 1400 RPM by increasing the frequency? And does the power consumption will increase?
It is possible to overspeed a motor by setting the frequency above the nameplate frequency. However, motor torque will start to decrease above 100% speed. This occurs because the faster speed leads to increased slip, which robs the motor of torque and converts the excess energy into heat and efficiency loss. Overspeeding a motor is sometimes done with fans, but there can be adverse effects of doing so. Power consumption depends on the loads that are connected to the motor.
@@realpars
In my case it's a water pump one horse power 746 watts, my plan to make a basic inverter or a soft starter circuit in order to run that motor on UPS 12/220v--1200 watts,but I face problem that my UPS circuit breaker cutting off due to rough start
Thank you for this video I learn great things 🌹❤️
You are very welcome, Emad!
Thank you for posting. Great intro video.
You're very welcome!
Good information
Thank you!
Thanks. Can you tell me, what is minimum kilowatt motor that autotuning possible through vfd ?
Technically, if the VFD has the option for auto-tuning, you can configure auto-tuning for whatever KW rating the VFD is rated for. Practically speaking, since auto-tuning is performed to improve the efficiency of the motor performance, tangible (measurable) benefits will not likely be seen for motors less than 5Hp (3.275kW).
Thanks for the video this just made my idea of a off grid induction motor and centrifugal pump to pressurize the water to drive pelton turbines for my hydro electric system a reality for my bitcoin mining operation, simply put much like the video i was wondering how i could control the pump speed for pressure to drive the pelton turbines to have more control on the overal out put of the generators also the electric motor is also powered by the same generators currently figuring out how to switch power sources for shutdowns for maintenance purposes where i would have to hydro systems to switch between to service but maintain electricity.
Thanks for the info sir
You're very welcome!
Nice video, was really helpful. Thanks a lot!😊
Thanks for your support!
At 2:20 your check valve is back to front. It would actually block water from reaching the filter.
Thank you for pointing that out. You are correct, the orientation of the check valve is reversed if the flow is from left to right.
It was very useful.Thank you.
Happy to hear that, Tahsin! Thanks for sharing!
So much details in one simple video. This is how they teach at school unfortunately
Thank you for your support!
Can you make a video about choosing vfd depend on application and motor type?
Thanks for your topic suggestion, Baris! I will happily pass this on to our course developers.
Happy learning!
Sir...I checked vfd incoming current that's value is 10 amps...but when checked vfd outgoing (motor side) then value shows 30 amps...
That means vfd saving power...but my question is...what phenomenon happen in vfd that's reason outgoing current is greater than incoming current.
I am guessing the incoming power is 480 VAC and the output of the VFD is 240 VAC. Power = V x A, so if the power output of the motor is constant, if Volts is cut in half, Amps will double. That is a little simplistic, but you get the relationship. Also, a VFD keeps the Volts/Hertz ratio nearly constant at the output, so a slow-running motor that has to generate a lot of torque will pull a lot of amps. That is why we use overloads on the motor leads (or use the internal current limiting function in the VFD configuration). Lastly, make sure you are measuring the amps on the VFD output correctly and correcting for 2-phase versus 3-phase operation. I would need to know the exact model number of the VFD to provide any further analysis.
Thanks for these coureses. They are very useful.
You are very welcome, Anthony!
Thanks for the informative video. The check valve direction needs to be reversed though.
Thank you, very informative video.
You have a new subscriber.
Great to hear that, Luis! Thanks for the support.
If I want to control a VFD (eg for controlling water flow of a pump) from a PLC, do I need to connect the VFD wires to an analogue input card or analogue output? I think it needs to be an output card, right? Because you need to tell the VFD to either increase or decrease flow rate. So should it connect to an analogue output card?
Yes, you will need to provide an analog output signal from the PLC and wire it to the reference speed input (setpoint) of the VFD. The value of this output will represent % Speed.
@@realpars Many thanks.
Very nice method to explore
Happy learning, Zeeshan!
Nice video, thanks :)
Glad you liked it!
Hi,
Do you recommend installing RCCB for a VFD Incomer?
A residual current circuit protection device interrupts a circuit in the event of a VFD malfunction. The RCCD measures the incoming and outgoing current of a device or system, and if these two currents are not identical, it will interrupt the circuit. It is essentially a ground fault detector. Personally, I have not used RCCDs with VFD installations, as most modern VFDs can detect internal current faults on their own.
Hi! Just wanna ask if it is required to use 1 vfd per motor? Thanks.
Hi there,
Thank you for your question. You can dedicate one VFD for one motor matching the voltage and current requirements. And you can add more than one motor to the VFD, but all motors will run at the same speed since the same VFD controls them. It’s a little more technical than it sounds. A quick answer is; if I have a 100 KW VFD, I can run 10 of 10 KW motors to one VFD. Please see the link below to help you understand more.
www.automation.com/en-us/articles/2011-1/vfds-can-control-multiple-motors
Happy learning!
@@realpars thank you thank you so much for this informative answer. So much appreciated. God bless
Nice Video, May I know the minimum output voltage and frequency for Dosing Pump application 380V 50Hz?
Normally, for efficient operation, the motor should not be operated at
@@scottsommer5450 Hello Sir, when i read the vdf delta datasheet, the common settings for V/F Curve for general purpose has min frequency 1.3 hz and 10V while max is 50hz and 220V. currently i set the setting like this but 220 change to 380V. I need low rpm for drawing minimal chemical flow
@@chickenz4604 Sorry, I just saw your question. What setting did you adjust? Which parameter changed to 380V? Normally, you would just need to input the motor nameplate data into the appropriate VFD parameters and set the output for the Hz value you need. The VFD does the rest. I will say that 1.3Hz / 10V is very low, and may be outside the limits of your specific VFD.
Hii this is Swathi from India
Did u heard about SFC and FCMA starters
If you did please make a video on them..and i must tell you your channel content is so helpful to my work.. thank you ☺️
Hey Bhattu!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Will VFD speed reduction increases torque as mechanical speed reduction with gear's ?
Thank you for your question. Yes, it can do that. But depending on your motor type and VDF used, you must size it according to the torque requirements you are looking for. Your local vendor should be able to help you size your VFD and motor.
Happy learning!
it's very use full thanks.
Great to hear that!
Very Simple and Easy-to-follow explanation.
Thank You
You are very welcome, Michael!
Thanks for information.