What is a VFD(Variable Frequency Drive) and how it Works Part-1 | BMS Training 2021

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. VFD(Variable Frequency drive) also know as VSD(Variable speed drive) is a motor controller device which changes the frequency and voltage of the incoming power supply to vary the speed of the AC motors. VFD controls and the startup and shutdown of the motor by controlling the acceleration and deacceleration of the motor.
Due to soft start of motor, no inrush current is drawn by the motor with the use of VFD.
Variable Frequency Drives(VFD) are used in industrial, commercial and residential building for motor and compressor controls. In commercial building VFDs are largely used in HVAC for Air handling unit(AHU) fan motor speed control in VAV systems. VFDs are also used with variable flow chilled water pumps, booster pumps and variable flow chillers. Apart from this VFDs are also used in Elevators and escalators to provided soft start and stops and avoid unwanted jerks.
Use of VFDs provide many advantages which include:
1) Soft start and stops of the motor reduces stress on motor and connected load.
2) Reduces stress increase life time and decreases the maintenance cost of motor and mechanical parts.
3) VFDs provide large energy savings where variable motor speed is required.
In this video we also discussed how a VFD works and how to connect to the BMS or SCADA system using software integration and hardware Interface through IO points.
We also discussed about the issue of harmonics created by the VFD and how to mitigate the harmonics using external filters (like chokes, passive filters and active filters) or by changing internal design of the VFD( like C-Less Drive and Multi Pulse Drives). Use of these methods reduces the harmonics created by the VFD but also increases the VFD price.
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[@TechSystems]

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[@غيرنفسك-ب2ن]

Our best channel ever Thank you dear brother ❤❤❤

[@TechSystems]

You are always welcome and thank you for your support.

[@sayyadafrid5101]

Also thanks for making time for us to make vedios in your busy schedule. We are grateful for your effort.♥️♥️♥️♥️

[@saleelp395]

part 2 needed

[@TechSystems]

It took a lot of effort and time to make this video. *. Please Like this Video to help it reach to others. *👍👍👍

[@abdullahmusheer4238]

please make practivial part 2 for this video your videos are very helpful. thank you.

[@TechSystems]

Thank you for your feedback. I will make another video about brand from some other brand.

[@bineeshsunny7052]

Hi sir, Please make a video based on basics for programming the DDC controllers also different communication protocols etc... How to set up work station, how to program chilled water system..

[@TechSystems]

Hi Bineesh, Thank you for your suggestion. These videos will be available on channel. I am working on it.

[@bineeshsunny7052]

@@TechSystems Eagerly waiting for that😍

[@SHIVAm-mp1dk]

Sir dil se thanks

[@Rajasekaran563]

Can do video on design aspect from scratch to end process alone

[@TechSystems]

I have videos about design documents including IO list, Schematic Diagrams, DGP drawings and Riser. Please have a look at these videos and If you need any further let me know. I will make a video... Thanks for you comment.

[@nikhiljk2532]

Hi sir, Pls do a video on programming of logics in niagara workbench, how assets are integrating to system

[@greentea_3885]

I have an upcoming VFD course Thanks for the advance informations

[@glady_007]

Thanks for this video ❤️

[@TechSystems]

You are welcome.🙂

[@thankwel]

Hi sir, Using VFD, power is reduction by 1/8 times or reduction to 1/8 times if motor speed is halved ? Thanks for the vid Sir. Appreciate much.

[@student6634]

Sir Show us a practical video of VFD and it's working

[@TechSystems]

I have practical video of VFD on my channel. You can watch Part-2 of this video.

[@stalinsubbiah3238]

What is the purpose of converting AC to DC again DC to AC in VFD

[@TechSystems]

To change the frequency of AC for speed control if motors

[@stalinsubbiah3238]

motor works on three phase AC supply and frequency is fifty hertz. Don't understand for purpose conversion we are doing ....

[@ik___mcstan1084]

Thanks a lot

[@sayyadafrid5101]

Thank you for making on VFD . ♥️ I was requested last time.😍😍😍

[@TechSystems]

Yes Sayyad I made this video as per your request.

[@sayyadafrid5101]

Thank you so much for your response no words to describe👍@@TechSystems

[@TechSystems]

You are always welcome.

[@tauhidalam3425]

​@@TechSystemshow to buy course from India

[@siuuu6724]

isnt the AO the speed control and AI the status feedback ? little confused :/

[@TechSystems]

Yes from DDC controller's reference;AO is the speed control and AI is the feedback. While if see from VFD reference AO is the feedback and AI is the speed control signal. I hope it would clarify.

[@siuuu6724]

@@TechSystems Ah okay, so if you were to wire this to the DDC, the AI on the VFD terminal would go to the AO terminal of the DDC? or vice versa?

[@TechSystems]

Yes it would go the same way as you described.

[@alifhabib3091]

Speed command "AO" 0-10vdc Speed feedback "AI"

[@غيرنفسك-ب2ن]

Amazing

[@TechSystems]

Thank You

[@muhammadahmadbabar3890]

Niec bhi

[@TechSystems]

Thanks

[@mohammedabdullahkhan4264]

Vfd run status is DI not DO

[@realtruth3767]

👍👍👍