in VFD when freq is reduce the voltage will reduceor not if
it will reduced upto ...
Answers were Sorted based on User's Feedback
Answer / vipul dhruv
basically vfd is a soft starter which is used for induction
machines. there are two methods of control on which a vfd
works... one is the vector control & the other is the scalar
control method. your question does not concern this so no
explanation is required i guess... now the function of the
vfd is to maintain a constant flux in the air gap of the
machine it is used for and that can be achieved only when
the V/HZ ratio of the machine is kept constant.so a ramp is
created in a vfd by the controller which gives a constant
v/hz ratio... and the flux is kept constant... by flux i
mean the magnetic flux.. so as the frequency varies the
voltage has to vary accordingly to keep the ratio constant
which is fed into the controller....the controller is the
heart of the vfd...
Is This Answer Correct ? | 4 Yes | 0 No |
Answer / ashok
yes voltage is reduced (out put) when frequency is reduced..
50 hz = 415v
25 hz = 270 v
0 hz = 0 v
if u reduce the frequency voltage reduce vice versa
Is This Answer Correct ? | 2 Yes | 0 No |
I think in VFD When frequency increases voltage also
increased & vice versa
Is This Answer Correct ? | 2 Yes | 1 No |
Answer / lallan chodhu
simply v proportional to 4.44 phi f n
v n f variable phi n 4.44etc constant.to maintain constant flux whole ratio v/f is changed agar sirf v badhaoge f kam hoga n vice versa.toh vfd ek prakar se v/f contriol hai
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / amrinder
arvind please give reason why voltage will increase??
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / arvind
Dear Amrinder
we know through v/f ratio, if frequency will reduce that
means the voltage will increase.
Is This Answer Correct ? | 1 Yes | 1 No |
Answer / amrinder
yes voltage is reduced when frequency is reduced..normally
for 1 hz, 7.42 volts is reduced.
Is This Answer Correct ? | 0 Yes | 2 No |
Answer / 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 |
what is difference between earth and ground?/
3 Answers Sree Rayalseema Green Energy Limited SRGEL,
if 20 hp motor starts directly delta connection.motor what will be the effect.
In an electrical power supply,why if neutral phase of a 3phase supply fail over current occur but if it's single phase supply neutral phase fail low current occur?
What is the unit of vaccum?
If two generator running parallel, at that condition both ngr Taken in line or taken any one ngr, but why any one or both Ngr in line? Ngr is use for which purpose?
what is the mazor difference between the induction transformer and synchonous motor?what is the similarity between them?
in control panel, how can i measuring the distance between one bus bar to another bus bar. then now only for bus bar. in mpcb and contactor also. that means one mpcb to another mpcb how much distance? how can i calculate that.
Explain briefly about current , voltage and power
why DG rating in kva
what is scan time of PLC & in which factor scan time is decide
Why transformer use to generator neutral earthing purpose ?
what is the difference between servo voltage stabilizer and general voltage stabilizer?