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 meaning of stub protection?

1 Answers  

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if our load in 3 phase circuit is 4000 amp. calculate the capacity of capacitor panel if line power factor is.80 .

1 Answers   ST Micro,

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why the rotor is outside in case of ceiling fan?

1 Answers   HCL,

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what will happen if transformer given dc input

5 Answers  

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What is Rough Balance Busbar Protection

1 Answers  

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When electric field is parallel to the plane of incidence, the electromagnetic wave is said to be a.Linearly polarized b.circularly polarized c. Elliptically polarized d. Hyperbolically polarized

1 Answers  

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How does CT can measure the high value DC current?

4 Answers  

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Is it possible to use AC supply insted of DC supply in trip coil operation? if not, why?

5 Answers   HAL,

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What is the working of SCM CT or purpose in genrator ?

3 Answers   Bhel,

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Between Turbo alternator and Hydro alternator which one is more difficult to cool and why?

2 Answers  

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Whats the frequency used in Rodents Repllant System????? What is the Diff btw Infrasonic & Ultrasonic Frquencies???

1 Answers   Emerson,

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what composit error,ratio error,phase error in CT and PT??

4 Answers  

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