in VFD when freq is reduce the voltage will reduceor not if
it will reduced upto ...

Answer Posted / arvind

In vfd when frequency is reduce the voltage will increase.
it is difficult to say that upto what level it will
increase or decrease, but speed can be find out by using
the formula.
Ns=120f/p
where f is frequency
p is poles

Is This Answer Correct ?    0 Yes 5 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

what is meant by motor startup supervision & motor load jam protection ?

5355


dc supply given to dc generator winding.how is possible? my knowledge is saying the winding will burn. please reply.

972


I have motor 1500 HP and , 4160 V , 60 HZ , then i need the rating of transformer which can feed that motor ??

1397


Please clarify, 1. Is it required to lay two runs of GI wire along with Armoured LT cable if it is laid between one big mains (63Amps TPN SDF) to small main (32A TPN SDF) with proper glanding termination? 2. If the armoured cable with proper glanding is laid from DB to CNC machine, is it required to run two runs of body earthing to the Machine from DB? 3.If the armoured cable with proper glanding is laid from Substation to Hangar, distance is approx. 100 mtrs, is it required to do earthing at shop area though the primary termination at substation is earthed through gland.

1559


What is A check, B check, C Check & D check for a diesel Generat

1568






what are the different methods for the starting of a synchronous motor.

639


PLS MENTION QUESTIONS ASKED IN IOCL INTERVIEW FOR ELECTRICAL EGG??

1953


Hi,iam a diploma in electrical engineering.rtd from indian air force in apr 2007.prsently working in reliance next link as a network maintenance engineer since 2007,can i get a job in motherson sumi.

1894


we are having 15kw and 3kw motor both can run in same time , instead of using copper we are using ug aluminium cable , 35 sq.mm is suitable for its current carrying capacity..?

1317


Why frame of the motor is specified?. If we mention KW and voltage level,automatically frame is decided or separately frame is compulsory to mention?.

1288


A 1F capacitor is charged to 100V initially. A 1H inductor is connected accros the capacitor througha a switch. The current in the circiut when the switch is closed is____

1863


What is the difference between Droop vs Isoch Control?

1901


How to test REF relay testing for LV panel as per Kahramaa standard?

4207


What products have you designed which have entered high volume production?

1574


Can you tell me more about pu systems (per unit systems )calculation in large power systems? how to get the base for voltage and power in generator, transformator and transmission lines?

1801