Variable Frequency Drives Explained | VFD Basics - Part 2

[@mujeebahmadkhan9996]

The quality of these videos is beyond belief. So much helpful. Thanks @RealPars

[@realpars]

Happy to hear that! Thanks a lot for your support!

[@oficinadoeletricista]

Their videos are excellent lessons with a wealth of amazing information, a lot of detail and quality standard to admire. I'm very grateful to the entire RealPars team for this excepcional content. Congrats on mastery on the subject. 👏👏👏👏👏

[@realpars]

Thank you so much! We truly appreciate your kind message and support

[@nambotheny1480]

It would be great for beginners like me by showing the parameters you used when designing the circuit

[@realpars]

Great suggestion!

[@silvestreortiz7999]

It would be really helpful if you can show how to install control wires!

[@realpars]

Thanks for the feedback and suggestion, Silvestre! I will go ahead and pass it on to our course developers.

[@aircates]

Awwwww…… I liked it better when I thought it worked on the principles of magic…. Now it makes sense….. Good explanation!

[@realpars]

Glad it helped! Thanks for your support

[@zainaabdin]

I pity myself that such knowledge and development wasn't available on days when I was still productive and immersed in working

[@hakuzu88]

Transistor has the same fonction than a contactor it just allowd the tension in 1 direction , the gate is the coil "a1 a2" , the emettor and collector is "13 and 14" in the normaly open contact :)) that all

[@nimbo9492]

Hi There, For applications where bypass VFDs required, i come across with requirements of soft motor starters in the bypass line if the vfd fails. This is understandle as in the mode of failed vfs, the inrush current in the bypass line has to be softeneded before entering motor and since there is no soft starters by default, that would be the requirement. What are the key differences between Manual bypass and E-bypass VFDs? For both VFD types, do soft starters need to be installed within the vfd housing?

[@realpars]

Hi Nimbo, Thanks for your comment! Those are great questions, I will be happy to pass them along to our course developers as a topic suggestion for future video courses. Thanks again for sharing!

[@nguyenphucnguyen4201]

I understand that the PWM duty can be changed by some kind of processor , but about the frequency, how could we change the frequency to control motor speed?

[@realpars]

Thank you for your question! The IGBT handles this based on the parameters programmed into the software. You simply send a signal to the drive to adjust the speed, either faster or slower. The PWM controls the frequency of the generated waveform. By altering the waveform, the VFD can change the frequency of the output signal, thus controlling the speed of the connected motor. We offer courses on these topics at RealPars.com. You can sign up for free if you haven't already. Here is a link for you to review and learn more. www.digikey.com/en/maker/blogs/2023/what-is-a-variable-frequency-drive-and-how-does-it-work#:~:text=The%20VFD%20feeds%20this%20waveform%20into%20the%20connected,output%20signal%20and%20control%20the%20connected%20motor%E2%80%99s%20speed. Happy learning!

[@slotzmori9181]

Are braking resistors essential for all drives??? Especially larger rated motors???

[@realpars]

No, but dynamic braking and other similar features can be found on most full-featured VFD packages.

[@slotzmori9181]

@@realpars thanks for the info...

[@michaelcostello6991]

Why do you only need to measure the current on 2 phases of the output to test for a ground fault

[@realpars]

Hi Michael, Thank you for your question. To detect a potential ground fault without causing a circuit trip, it's crucial to check for an imbalance in the electrical connection with a Ground Fault Detection (GFD) device. Testing on a single-phase Variable Frequency Drive (VFD) is essential. For a three-phase VFD, it's advisable to select any two of the three phases, as most three-phase GFD systems will monitor all three phases. Happy learning!

[@mohitrawat8087]

"How does it work with DC inverter compressor" make a video on that

[@realpars]

Thank you for the topic suggestion, I will happily go ahead and share this with our course developers.

[@jbkrobin]

Please, make it a full course. Where can I find the rest parts?

[@realpars]

Thank you for your comment! We have the following two courses on VFD, feel free to check those out over here: www.realpars.com/courses?*=vfd Happy learning!

[@iacovacheiuliangheorghe64]

Hello. I have a Romanian SP81sw bench lathe, it's small with an 80mm universal and it has a 0.37 kw / 380v motor. I only have a 220v network. What power should the VDF have for this motor, should I switch it to a VFD to run on 220v .Thank you!

[@realpars]

Hi there, Thank you for your question. To start, it's essential to ensure that your motor aligns with the specific power requirements in your local area. It's crucial to follow safe electrical connections in your region to prevent potential fire hazards and electrical problems. Adapting your motor to match the local voltage and power standards and acquiring a Variable Frequency Drive (VFD) for precise speed and current control is the safest approach. Your sales representative should assist you in sizing the appropriate VFD for your needs. Additionally, I recommend consulting a licensed electrician familiar with your area's regulations for the proper hookup. Wishing you a productive learning experience with RealPars.

[@vky8304]

very very very well indepth explaination,👏 with easy understanding 👍

[@realpars]

Glad to hear that!

[@bazrazin1]

what about the varying frequency component, if a ac device operating frequency is 50hz, it will perform worse at other frequencies other than its tolerance.

[@realpars]

Motors perform best when the Volts/Frequency ratio remains constant. A motor designed for 400 VAC and50 Hz has a V/Hz ratio of 400/50 = 8. As long as that ratio is maintained at other frequencies, the motor will run efficiently/. A good VFD will require the input of the motor characteristics as parameters and use those parameters to adjust the output to the motor based on the frequency chosen to run. Using a good inverter-duty-rated motor with a VFD will help insure the longest life possible from your motor.

[@IngDzib]

Thank you very helpful for me.👍👍

[@realpars]

Most welcome!

[@eminyurekliturk6669]

Great video again, I just didn't understand how T3 current transformer reads when all 3 phases passes through. It should read zero all the time I guess.

[@realpars]

That is a great question! Although T3 is not drawn as such, T3 would typically be a three-phase current transfer, which is comprised of three interconnected single-phase transformers in a single housing, either using a single “3 phase core” or three individual toroidal cores.

[@chelebelarkhala]

VFD peramiter setting all video

[@kashifupdates1960]

Wich software use to make this vedio Please tell me

[@realpars]

Hi Kashif, Thanks for your comment! To answer your question, I am actually not sure about that as this is done by our graphic and animation department.

[@PLC_Pursiut]

Engineering is fascinating .

[@nambotheny1480]

This is really helpful thank you

[@realpars]

Glad it was helpful!

[@roytutorialchannel2761]

Thank you very much for Teaching this video, I work Electrician

[@realpars]

Glad it helped!

[@roytutorialchannel2761]

@@realpars yes friend, I will stay this channel

[@anwarkhanpathan3156]

Does VFD change input voltage amplitude to low amplitude output voltage?

[@realpars]

A VFD will typically maintain a constant V/f ratio in order to minimize eddy currents and hysteresis losses. Therefore, voltage changes as frequency changes. If you have a 525VAC motor operating at 50Hz, the V/f ratio is 10.5. So if a VFD is used to adjust the frequency to 20 Hz, to keep the same V/f ration, the voltage to the motor will be reduced to 210 VAC.

[@ahsan9753]

Sir your explanation is so Amazing thank you for your service 😊

[@realpars]

Thank you so much! It's our pleasure.

[@joaofabri5679]

It was pretty good!! Just some VFD's don't have TC in Input

[@realpars]

Thanks for adding that, Joao!

[@jalil1505]

Thanks from your nice teaching we hope to share more videos with us

[@realpars]

You're more than welcome! Thank you for your support.

[@mseviews1171]

Pls explain about VFD control terminal and functions

[@realpars]

Thanks for sharing your topic suggestion, I will happily add this to the list. Happy learning!

[@vohuy997]

Can you explain why use only 2 CT on 2 phase

[@realpars]

Thank you for your inquiry; it's an excellent one! The suitability of this approach depends on your specific engineering and safety requirements, as well as compliance with local codes in your region. Typically, to optimize cost savings and considering your engineering needs, you aim for a current imbalance of no more than 2 out of 3 leads. In the event one current wire feed experiences a break or fault, the remaining 2 out of 3 will carry a higher current load. Consequently, the electronic circuitry will detect this imbalance and trigger a fault condition in the drive before significant damage can occur. However, it's worth noting that many modern drives now incorporate three Current Transformers (CTs) to monitor current loads more effectively. For further information and to expand your knowledge on this topic, you can refer to the following link: en.wikipedia.org/wiki/Current_transformer Happy learning from RealPars!

[@vohuy997]

Thanks a lot@@realpars

[@pavunumuthu9510]

All video very super VFD topic amazing i am also Realpars big closely fan,from indian country state in Tamilnadu chennai.

[@realpars]

Great to hear that, Pavunu! Thanks for your support

[@pavunumuthu9510]

Welcome

[@pavunumuthu9510]

All realpars teams again welcome 👌👌👌👌👌👌👌💐💐💐💐

[@marlonmoraleda9953]

Thank you Realpars team!!! I wonder if you have plans in adding Schneider PLC to your Schneider Online Courses? I would love to enroll in online course if this is available.

[@realpars]

Hi Marlon, Thanks for your comment! We currently do not have any courses on Schneider PLC, but I will go ahead and pass this on to our course developers as a suggestion. Hopefully, this is something we can work on for future courses. Thanks for sharing and happy learning!

[@SathishTech07]

I too working with Schneider plc. In Indian market 70% occupancy is Schneider.

[@4costindan]

it should be great if you make a video with harmonics regarding the VFD. Thanks

[@realpars]

Great suggestion, Dan! Thank you for sharing and happy learning.

[@4costindan]

@@realpars - Btw...last week, my team spent 4 days and nights looking the reason why trip a plant room with 12-15 VFD. We got crazy . Thanks

[@Flankymanga]

I would also like to suggest a topic: What is the purpose of pre-charge circuit and how does it work? Thank you!

[@realpars]

Great suggestion! I will happily pass it on to our course developers for possible future video courses. Thanks again for sharing.

[@Flankymanga]

@@realpars Thank you. I would expect that it is a piece of circuitry to protect the smoothing capacitor for blowing out from initial rampup voltage spike? That is my assumption but i would like to know how it works from physics standpoint.

[@realpars]

@@Flankymanga Yes, you are correct. The resistor(s) in the pre-charge circuit slow the rate of capacitor charging so that the capacitors are not overcharged when the motor first turns on.

[@solarpoweredengr]

🎉

[@scottthomas5819]

👍

[@mehmetayparyangozalumni2606]

Where is video part 1 on description?

[@realpars]

Hi Mehmet, you can find part 1 of this course series over here kzbin.info/www/bejne/fpLco6yviL2SptE Happy learning!

[@engrbaqar4823]

Thank you sir... Doing Great job

[@realpars]

Most welcome!

[@manzoorelahimansoor1473]

Really helpful thank you realpars

[@realpars]

Our pleasure!

[@prabhsharansingh5222]

Need a video on regenerative drives

[@realpars]

Thanks for your topic suggestion!

[@Militovec]

I recently changed my job and this is very helpful for my adaptation in the company. Thank you a lot

[@realpars]

Great to hear that! Best of luck at your new job!

[@zinabuberhe-tk1nq]

very good teaching style

[@realpars]

Thank you very much!

[@runbou3485]

Thankអរគុណ

[@vivianchen5214]

🎉🎉🎉🎉

[@deniskalugin7984]

Would be great to take a course how to use VFD for PID control.

[@realpars]

Realpars.com has two courses on PID control: learn.realpars.com/courses/how-to-configure-a-pid-controller-in-tia-portal and learn.realpars.com/courses/PID-Controller. PID control using a VFD as the final control element is essentially the same as using a control valve as the final control element. There are differences in the way VFDs behave as compared to control valves, so the tuning of the PID loop will be different. Some advanced VFDs have the capability to perform the PID control inside of the VFD electronics, which is a whole different topic. I prefer to not use that feature of a VFD unless you have a very steady application, such as an AHU fan in an HVAC system. I have noted your course suggestion and I will pass it along to our course development team. Thank you!

[@deniskalugin7984]

@@realpars thank you! Yes, using proportional valve for PID control looks quite simple and understandable in terms of connections, since this valve utilizes analog signal from AO module. To change rotation speed of the pump we need to change current frequency on VFD, that is different from valve. For professional PLC programmer it is easy task, I suppose, but for beginners like me it is not so obvious. I think, contolling pump flowrate by changing motor rotation speed is very useful task for many applications. Thank you again for the information. Your courses are the best!

[@mosessimukoko6295]

Learning from the best

[@realpars]

Happy learning!

[@JKTCGMV13]

🙏

[@somnathojha924]

Very good presentation

[@realpars]

Thank you very much!

[@ryanreed7763]

Part 1 was great! I have been waiting for this

[@realpars]

Glad you enjoyed it!

[@alimombeini2298]

❤👌

[@surendrakverma555]

Thanks 🙏🙏🙏🙏

[@realpars]

Happy learning!

[@eb3872]

You’re the best

[@realpars]

Thanks a lot!

[@Bojak079]

I TRULY LOVE REALPAARS!

[@realpars]

Great to hear that, Brian!

[@user-ob7eb5sh5w]

Thanks a lot

[@realpars]

You're very welcome!

[@raulgarcia528]

Exelente explicacion

[@realpars]

Thank you!

[@edshesolomon5452]

thank you

[@realpars]

You're welcome!

[@petrutarabuta5617]

Thanks!

[@realpars]

You're very welcome!

[@hmrd8555]

Very useful

[@realpars]

Glad to hear that, Harish!

[@saadal-dossari3994]

As always a great video.

[@realpars]

Thank you!

[@samalfellah2066]

Another great video

[@realpars]

Thanks again!

[@chinmaysen3912]

Awesome!

[@realpars]

Thank you!

[@michealgoudarzi6893]

Amazing teaching

[@realpars]

Thank you, Micheal!

[@AlexandreSantos-gg9il]

I watch all the videos of RealPars I'm a fan, from Brazil hugs.

[@realpars]

Great to hear that, Alexandre!

[@filimniko]

Thank You!

[@realpars]

You're welcome!