If a fan get trip and run in reverse direction due to system flow. Now in this condition during starting how can a VFD bring this negative speed to zero and later run in forward direction?

2 Answers   Aditya Birla, Siemens,

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how does an encoder work???

0 Answers  

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What is ferrite affects and what is disadvantage of ferrite affects.

1 Answers  

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what is the criteria for selecting fuse rating in 1phase, 2phase & 3phase welding sets?

0 Answers  

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does over charging of a battery reduce its life?

4 Answers   KSEB,

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Why we use RYB phase sequence?

3 Answers  

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what is the formula of starting current of 3phase and 1 phase motor???

0 Answers   L&T, WFP,

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magnetizer priciple

0 Answers  

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how we decide scurt (disc) of insulator with respect to kv rating

1 Answers  

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what is the diff between VCB & ABCB breaker in substaions? explain the operating priciples of VCB & ABCB

1 Answers  

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which cable is preferred PVC OR XLPE for voltage from 220V to 11 KV with proper justification

1 Answers   BARC, Sail,

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What is the working of SCM CT or purpose in genrator ?

3 Answers   Bhel,

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