Answer / gennadiy

Yes, the voltage in the simpliest V/f control is decreased proportionally with the speed decreasing. V~f in linear V/f control and V~f*f in parabolic V/f control (for pumps and fans).

Answer / h s sandhu

VFD means variable frequecy drive,If voltage is reduced then speed will reduce.

Answer / devinder

No effect on motor speed.
N=120F/p

Answer / uditparashar

ifbthe motor is running in constant torque mode then decreasing the voltage will result in increase in frequency hence speed will increase in constant torque mode otherwise speed will decrease

what is the pre charge circuit,what will be work which function it will be use plz tell me

0 Answers  

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can we measure +,-.zero sequence current ....? if so how can ???

2 Answers   NLC,

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What should be the voltage between Neutral and Ground in secondary side of the step down transformer (230 V to 110 V) with no load condition?

4 Answers  

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Does VT metering core can be used for synchronizing.

1 Answers   Shrishti Power Technologies,

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In supply RYB are mentioned. But in transformers, why they are mentioning XYZ?

3 Answers  

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Draw a SLD of HT distribution EB grid up to users Transformer?

0 Answers   HSL, VVL,

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what is the operation of regulator in fan?

4 Answers   NTPC,

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why protection meter is always connect to star

1 Answers  

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Which Motor used in Fan's Motor ?

3 Answers   Matsui Technologies,

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1) why a dg set shows variation of power factor and load when synchronised with other dgs? 2)Why the load sharing is not become equal in all dgs?. 3)When a dg set will not run on auto start?

0 Answers  

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what is the difference between E.L.C.B & R.C.C.B?

2 Answers  

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why neutral busbar size is SAME of the phase busbar size UPTO 200A IN LT PANELS

1 Answers   IBS,

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