Interested to Buy Any Domain ? << Click Here >> for more details...
What is basic difference between Soft Starters And VFD
drives?
- 19 Answers
- 51953 Views
- IBM, I also Faced
- E-Mail Answers
Answer Posted / naresh singh thakur engineer e
vfd means variable frequency it it is used where speed
variation is required it saves the energy also for example
we use vfd in air compressor when compressor is in load
mode motor runs at full speed & while compressor is in
unload mode the motor runs at its reduced speed up to 30 %
of full speed hence at this time energy saved.
we can achieve the speed above the rated speed & below the
rated speed using vfd the basic is the formula
NS = 120 * F / P
where ns = speed of motor
120 angle in electrical degree between two windings or coils
F = frequency which is to be varied
p= Number of poles
wher if no of poles = 2 fix
120 degree is fix
f= 0 to 70 above
put these values in formula & find results
while soft starters are the earlier version of vfd with
some less features than vfd
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
Whether amorphous core transformer is commercialized or not:Name of company making amorphous core transformer and what are different rating?
I need HT sphere gap calibration table. Can any body help me.
what are problems caused by the pdu in rack server
which are the criterias needed to select the kind of neutral earthing(solid earthing,resistance earthing,etc.) at various voltage levels in electrical distribution?
when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wattmeter in terms of construction?
I'm looking for a softcopy manual set for a Credence ASL- 3000. Anyone know where I can get it?
Why the magneti fields are not passes from southpole to north pole
How many kw will suply from one db
before transformer oil dielectric strenght tests are taken the oil should be allowed to settle to remove option 1 air bubbles 2 gasses 3 contamination 4 water
what material is used in capaciter
why genarator genarating voltage 11 KV?
what are the advantages disadvantages of connecting high voltage block( 1:1 transformers) transformers between the turbo generators and busbars.
Give idea about General Engineering. From which book i can study this topic. Pl. reply me via email. My email is ravi@bhelhwr.co.in, also give the name of book/website, from where i can prepare it.
in a simple IDMT relay we use neutral point of ct for earth fault then what is the requirement of neutral ct and cbct?
How can we design a HVAC Plant room which includes AHU,FCU,Chillers,Cooling towers, Pumps etc & how will they work? any Drawing if possible?
