ac induction motor variable frequency drive

[cesar75313]

that look like a johnson dx9100 controler at face of panel

[livefreeinuk1]

i wish i had all ur electrical knowledge

[alitou001]

@livefreeinuk1 it just take times to reach a high level of knowledge

[manu4007]

wow i like this post. it's exactly what i was looking for my project.

[Rightslip]

Great instruction! Just one thing: Safety Glasses!! Apprentices watch this and once again we need to teach by example.

Be safe! George

[amartinjoe]

thanks for posting; very interesting to see the stuff i'm learning at school in the real world.

[VFDDistributing]

We work on many of these, great video, thanks for the post!

[ffsallnamestaken]

Whats the point of resistors across the capacitors? What does that do, its use etc.

[PlasmaFire3000]

They're possibly high-value bleeder resistors that discharge the capacitors when they're not being used. Mostly for safety's sake during servicing.

Otherwise, as the man said in the video, it's part of the RC circuit for the variable-frequency drive, possibly as a constant time base for circuitry (since the time decay constant t, or Greek letter "tau," is equal to the product of the resistance and capacitance in an RC circuit).

[pclle]

discharging voltage after units have been turned off

[jolugax]

They balance the voltage across the bus of capacitors, and in some cases they are used to drain the voltage when the drive is turned off

[HemiHotRod]

@ffsallnamestaken They are called bleed-off resistors. Without the resistors, when the contacts of the controller open, the cappacitors would discharge and arc across them causing unwanted pitting and premature wear.

[lastnameavailableok]

@ffsallnamestaken

balance DC buss voltage when power on, bleed DC voltage to zero when powered down..

[bossou5555]

good job

[fazelada]

awesome explanation,very intersting.

[Aussie50]

Nice to see Danfoss VLT's!

I've had a few busted ones come in as scrap from Danfoss Aus and they are really interesting to disassemble!.

[BADtimmay]

good to see danfoss drives being used in the usa...

[brookz101]

I am an engineering student working with VFD. Looking for a fast pump or motor for our presentation. Thanks guys. We have limited recourses at our location.2054051703

[yun342]

Really intresting. Thanks for posting

[Djnoxes]

great vid