Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

0 Answers   Pride Hotels,

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1.What is the maximum transmission voltage in india & where it is located? 2.more information about indian power scenario.

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what is ferranti effect?

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why we multiply 11 in High Electric supply?(eg.11KV, 33Kv, 330Kv etc.)

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Following test should be conducted to find out relative polarity of transformenr terminals A no load test B back to back test C phasing out test D none of above

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Does all the output contacts (N/O as well as N/C) of a Numerical relay operate when relay receives a binary input/inputs or contacts are designated to specific logic input/inputs and only these contacts operate?

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can anyone provide me a amf panel control wiring using ec-2 relay?

0 Answers   Electro Tech,

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can transformer develop three phase poer from a single phase source?

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In supply RYB are mentioned. But in transformers, why they are mentioning XYZ?

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magnetizer priciple

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what is direct dischage of power transformer

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What does the a,b,c of 95a,95b,95c relays denotes?

0 Answers   KSEB,

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