Answer / suresh

VFD – variable frequency drive..
VFD is useful in energy saving because it reduces the
motor speed as demand decreases.When the speed is reduced
the power consumption Will also reduce because ,
Power = (speed)3 {cube of speed}
For example if the speed is reduced to 80% of the maximum
value the power consumed will be reduced by 50%
Power consumed = (0.8)3 = 0.512 = 51.2%

Answer / manoj patel

VFD drive controll speed of motor by varing its freq.
But at varing freq. it have to maintain V/F ratio
constant.So for reducing speed it have to reduce freq.but
its also maintain V/F ratio constant.So automatically its
voltage is reduced.
So powre is depends on V, I & PF. So its save energy..

Answer / rahul

Practically VFD helps to save enery in Variable torque
loads only like Fan , pump. With affinity laws Power
proportinal to cube of speed, so if speed is reduced you
will get energy saving by using this law.

For constant torque application , if your process speed is
not full RPM but less than that say 30 Hz , then energy
saving will be there by using VFD, as you are not required
to run the motor at full speed.

Answer / m.k.k

have anybody checked the input and out current of drive if
yes then he knows that ipput current of drive is less than
that of out put current that is because of power factor

Answer / mashood

The real saving is observed when the VFD is used on input reference of temperature, pressure, differential pressure etc.,and this is more significant in case of Fans and Pumps, specially when we calculate the energy consumption over a certain period of time where different temperature and seasons are involved.

Answer / tilak guruge

vfd is help to reduce the power consumption and saving the life time is motor and other related pats of the pump.basically vfd is control the motor speed and its give command to the motor as a demand

Answer / itc ltd, snacks ,haridwar

Drive function is power convert,one way to onother way(by
phase convertor)So improve the power factor,

Answer / mkk

vfd drive works almost t unity pf. so this mainly it saves
energy. if u connect motor directly it works on .8 of pf.
but vfd mainly used for better speed and torque control not
for power saving purpose

How can we calculate the fault level of the distribution system knowing the percentage impedance of transformer & subsequent equipments.

14 Answers  

what happens when current(ac or dc)flowing through a boucket of water?please describe it.

3 Answers  

what is photo voltic cell,& what are the materials associated with that?and any spcifications like volts/cm etc?

0 Answers  

what is maxemo work permit procedure

0 Answers  

As we know induction squirrel cage motor torque Directly praprortinal to applied voltage in star connection & delta also. If I connect 55KW Motor to DOL starter in load condition does motor withstand the load & what will be the current withdrawn ? motor will not fail ?

0 Answers  

explain wiring system

0 Answers  

Explain marx circuit.

0 Answers  

Define closed loop control system.

0 Answers  

what is interference

1 Answers   L&T,

what is meant by trivector meter?

2 Answers  

what is the resistance value of our human body?

9 Answers  

what is difference between 3.5 core and 4 core cable

5 Answers   Havells,