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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WHAT IS THE DIFFERENCE BETWEEN KW AND KVA ?

10 Answers  

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how to increase senstivity of ct

0 Answers   NPCIL,

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working of bucholz relay of a transformer

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Difference between mcband isolator

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Define the term Capacitance and Inductance?

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i m doing DEEE in part time,can i join regular cources in BE,,IF i join what the cources can i select like (civil,ece,IT) ,,kindly advice

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i want to know about for what reason we are using star delta starter? how it works? what are the advantages?

4 Answers  

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1.how to calculate energy units in our home at singe phase, 2.415V,63A wiring what will use thickness of wire

2 Answers  

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Can any one know what are the symbols at the down (below) the analog ammeter??? there are 4 symbols which are they ?????

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what is the method to calculate the voltage drop for number of meters Example 250volts I/p at one end if the cable length is 50 meters what could be the drop?, after 100 meters how much? needs formulae.

1 Answers  

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Difference between directional over current and non directional over current ?

2 Answers  

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