Interested to Buy Any Domain ? << Click Here >> for more details...
why contactor not provided between output of VFD and motor?
- 6 Answers
- 21758 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / revansiddappa p.h.
Basically contactor is used to make and break the circuit
like any switch. For handling higher current and volatge we
use contactor; not only for motors.
Between VFD and motor; contactor is not required.
Because VFD will have features like enable and disable.
VFD will use IGBT's inside for switching application.
As IGBT's are semiconductor ; switching is fast compared
to electromachanical type contactor.And IGBT's handles
larger currnts.By enabling or desabling of VFD we can
Start/stop motor(with speed command). If contactor is used
there will be some time difference in swithcing ON/OFF of
IGBT and contactor which may lead to failure of IGBT and
motor winding and insulation. So it is meaning less to use
conatctor and also cost will be more.
| Is This Answer Correct ? | 23 Yes | 4 No |
Post New Answer View All Answers
Will an earth leakage trip be activated if the component or wiring is faulty on low voltage equipment.Example An electrical Cat Scarer placed in the garden and water gets into the wiring.
How to design a Unit auxiliary transformer for a power house having a unit of 65 MW and Generating voltage of 11 KV and Secondary voltage of 433V
Explain the different regions in frequency response?
how to calculate units consumption for a 12 hp motor /hr.
Why is back emf used for a DC motor? Highlight its significance.
What are the types of piano switches?
1.what is mean by 8/20 micro sec waveshape
What is difference between Sample test and Routine test in safety standard?
why occ characteristics curve in not tracing back when we are bringing back the rhoestat?
what curve and rateing would you use for a three phase 0.75kw motor?
where lt & ht capacitor used
Mention what are the types of semi-conductors?
how many joints are allowed in underground HT cable of 1 KM
In case of HV test on medium voltage cables, BS is asking for 4 U0 where as IEC is asking for 3.5 U0. Can any one advise me how this 3.5 times or 4 times U0 is derived?
State the formula for overall efficiency of thermal power station
