Answer / gennadiy

Yes, the voltage in the simpliest V/f control is decreased proportionally with the speed decreasing. V~f in linear V/f control and V~f*f in parabolic V/f control (for pumps and fans).

Answer / h s sandhu

VFD means variable frequecy drive,If voltage is reduced then speed will reduce.

Answer / devinder

No effect on motor speed.
N=120F/p

Answer / uditparashar

ifbthe motor is running in constant torque mode then decreasing the voltage will result in increase in frequency hence speed will increase in constant torque mode otherwise speed will decrease

what will happen, if both relay contact has live supply, and coil of relay activated

1 Answers   AVS,

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describe the constructional features of an auto transformer and its principle operation

0 Answers  

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From what on-site components does the HT panel monitoring the bus-bars in a 11kV system take inputs?

0 Answers  

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what is metering cum synchronizing panel and how it is used?

0 Answers   Wipro,

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Explain what is clipper and clamper circuits?

0 Answers  

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what is AVR in alternator how its work?

8 Answers  

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What is the voltage b/w nutral and earth

11 Answers   Mind Space,

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can I connect step down transformer(25KvA,240V Phase to phase)to output of online UPS(15KvA,440V PHASE TO PHASE) Load connect to TRANSFORMER is 13KvA,240V PHASE TO PHASE. please brief if it is wrong

1 Answers   DRJ ARDE,

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what is formula in determining the size of Circuit Breaker for transformer with the following specifications. 7 units of 1600 volts (primary) and 400 volts (secondary). Both Primary and Secondary will have a circuit breaker which is SF6. What should be the Switchgear Main Breaker Size anf the sizes of each brances Circuit Breaker for Primary.

1 Answers   ABB,

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what is the meaning of 5% droop or 7% droop in AVR?

0 Answers  

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can we load Power capicitors on DG sets?

14 Answers   Neptune, Nimbus, Westin,

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what is meant by negative conductor?

2 Answers  

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