Interested to Buy Any Domain ? << Click Here >> for more details...
A dc motor running on dc drive whose input is 3ph AC what
will happen if we change the phase sequence of dc drive for
e.g (R Y B) is connect as R B Y, will the motor run as same
as previously running before changing phase without any effect
- 4 Answers
- 8969 Views
- I also Faced
- E-Mail Answers
Answer Posted / nimda
The dc drive may not work at all if you connect your input
power with wrong phase sequence because the firing pulses to
the thyristors will be in wrong sequence. So the motor may
not start at all. There are different types of dc motors but
usually the direction of rotation doesn't change by changing
the polarity at the power source. To change the direction of
rotation you must usually swap either the polarity of the
field winding or the polarity of the rotor winding.
| Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
What type of core material is used for metering C.T and protection C.T???
explain the function of brush less dc motor?
Can you explain about Restricited earth fault protection scheme
Give two basic speed control scheme of dc shunt motor?
volts=230 c=10mf a=??
Z transform is use when system is not a) converges b) diverges
why the difference arise between HT reading & LT reading (submeters fixed in complexes, apartments etc)if the power factos exceed from 0.9 to 1 can the ht meter reads fast?
5- What is the task (function) of the excitation and isolation transformers in power plant? 6- What is the task (function) of LCI (A), LCI (B) and LCI (COS) in power plant? : LCI (A) and LCI(B) are load commutating inverter for generator turbine starting. , LCI (COS) is load commutating inverter change over switch
redundant connection in contactor?
What is time response of the control system?
Why is water motor not taking the pressure? what is the problem?
what is the difference between earthing and unearth
What is the unit of attenuation?
what is the best method of grounding in 30 MW generator?
Please help me regarding my one concern. - During earth pit testing we noticed that the Clean earth pit and dirty earth pit showing continuity (Resistance value - 5ohm) . I want to know that if both earth pit have separate location and there is not internal looping between PIT then why such continuity is showing on it . Because of this issue the field side all earthing point showing short. In PLC panel we are providing two types of earthing cable which is coming from separate earth pit (Clean and Dirty earth pit) because of earth PIT showing short our PLC is not complying spec . please help regarding this issues.
