What does VVVF stands for in VVVF drive ?
How does it differ from VVF drive?
Answer Posted / manas kumar behera
vvvf-variable voltage variable frequency drive
vvf- variable voltage frequency drive
the diffreance between this two drive is
in vvvf if u vary the voltage frequency eill also vary
but in vvf only voltage will vary..
ex:- ABB drives are vvvf drives
Is This Answer Correct ? | 1 Yes | 2 No |
Post New Answer View All Answers
DEAR SIR/MADAM,CLEARLY EXPLAIN ABOUT CRAWLING AND COGGING EFFECTS IN INDUCTION MOTOR.
Which type of air compressor is used now a days in the market. Keeping in mind of energy efficiency and maintenance points. Relevant documents may also be sent on mentioned email ids.
is it possible to turn on the single phase star delta on delay timer using 24 v dc ?
WHAT IS THE SIGNIFICANCE OF VECTOR GROUPS IN TRANSFORMER? WHAT WILL BE EFFECT WHEN PHASE DISPLACEMENT CHANGES IN TRANSFORMER?WHAT IS THE NEED TO BE PHASE SHIFT CHANGE BETWEEN THE PRIMARY AND SECONDARY WINDING
is the value of inductance depends upon the value of thitha in doubly excited machine??
what causes contact chatter when there is no demand on the air conditioning unit?
I am going to appear for the RRB Chennai junior Engineer online exam. Please send me the previous exams question papers (also solved) to my mail id: rrkhandhar@yahoo.com
How to choose the vector group for the step up and step down transformers??? Tell me the which vector group is suitable for step up and step down transformers and whats the reason to choose and whats the benefits???
What is the principle of HIGH SPEED DIRECT DRIVE MOTOR ?
What we mean by vintage of an engine+Generator?
What cmos is and its benefits?
what is the difference between directional & non directional earth fault with example please explain.
What is the power factor of an alternator at no load?
what is your majour contributions in your present job
Which are resistive loads & which one are inductive loads : Refrigerator, Split air conditioner, ceiling fans, well pump, fluoresecent bulbs, T.V, CRT Monitors, Adsl Routers, C.P.U, Printers, Deep Freezers, Speakers, DVD Players, Microwave oven etc. ? Output Power for these Appliances Would be same like this : P = V * A * P.F Or would be changed ? thanks