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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how to calculate the current carrying capacity of a conductor. How it is related to diameter of cable or conductor

3 Answers   AGC, BARC,

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sir what is the minimum IR value of 11 KV alternator?

4 Answers   Kirloskar,

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what is the different between second harmonics and third harmonics ?

1 Answers  

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if the magnetic lines can pass through a vaccuum area

0 Answers  

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which motors are used in electric traction?

1 Answers  

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what is the contact resistance of vacume circuit breaker??

1 Answers  

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How to calculate the time setting for star connection in star delta starter? For example 10KW 3PH Induction motor.

0 Answers   Taj Group, Tata Steel Limited,

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how i calculate the size in mm of the LT 4 core cable for 100 HP inductive motor pump

1 Answers  

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If a Power Transformer Fails and the transformer manufacturer suggest that "Do all electrical test on the transformer?". What are the test to be conducted in this condition?

5 Answers  

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If the load is 10Kw and power factor has to improve from 0.5 to 0.8,how can we select the capacitor rating accordingly.Illustrate by showing formula?

9 Answers  

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i need list of swg(standard wire guage) or area of conductor v/s current carrying capacity of conductor copper & alluminium...

0 Answers  

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