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

The magnitude of sum of two sinusoidal av voltage is equal to 230 volt.the magnitude of each individual voltage is also equal to 230 volt.what must be the phase difference between voltages?

0 Answers   PGVCL Paschim Gujarat Vij Company Limited,

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Differentiate between Zero and Negative sequence current

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Why transformer neutral earthing? What is advantages?

6 Answers  

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why C.T secondary are rated 5A generally?

13 Answers   ABC, Bhel,

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diffance between eletrical and eletronics?

3 Answers  

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what is difference b/w HT & LT and the range of HT & LT ?

22 Answers   AF, Schneider,

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in control panel, how can i measuring the distance between one bus bar to another bus bar. then now only for bus bar. in mpcb and contactor also. that means one mpcb to another mpcb how much distance? how can i calculate that.

0 Answers   ABB,

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how gen. load increase or decrease ? what happen with gen on that time

2 Answers  

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What is meant by stator? What is meant by rotor?

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why abcd parameters are called as transmission parameter?

1 Answers   Accenture,

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1. what is usage for power factor in industries?? 2.why we need to monitor power factor??

4 Answers   Havells,

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Why power factor is arising in electrical circuit, is it possible to eliminate from the circuit, why

2 Answers  

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