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kittamani
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Engineering Fields - Electrical Engineering - New Member

Join Date: Feb 2010
Location: sikakulm dist,andhraprdesh,india
Posts: 7

VFD

02/14/2010 10:19 AM

we are using 2 nos of 250 kw VFD for ID fan application in boilers.

out of one automatically reducing the rpm to zero, and we are able to restart immediately after reaching zero rpm (the drive doesnot requires no reset operations ) .it is not leaving any alarms also. the model is MM430, SIEMENS make.

fan application is 750 rpm max,but we are always operatiing around 500 650 rpm only ,load also 65 % only.more over there is no commond from DCS, it is operated from panel mode,

it is gretely confusing, pl give suggestions

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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#1

Re: VFD

02/14/2010 8:08 PM

Chances are about 99% that you are somehow losing your run command. Are you saying that you are ONLY using the keypad for on-off and speed control? Or are you using something else for on-off and then using the keypad for speed control?

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Anonymous Poster
#4
In reply to #1

Re: VFD

02/16/2010 12:44 AM

thanks for the valuable suggestion, i will check the loss the run command
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ereneduarte
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Join Date: Oct 2008
Posts: 39
Good Answers: 1
#2

Re: VFD

02/14/2010 9:40 PM

My Friend,

This is DED problem or design problem.

VFD is being used without a purpose? Make a use of it by using Temperature or Pressure Switch/Transducer or combination. You can adopt this locally inside the local panel.

Eren
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#3
In reply to #2

Re: VFD

02/15/2010 11:25 AM

If he has one working correctly and the other is not, it's a good bet that his overall system design is not flawed.

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