Am using an electronic digital display to see the RPM of ABB ACS 550 drive, which is showing negative value when the motor & drive in stop mode but it is showing correct value during the run mode. can anyone help me out??

2 Answers   Bala Power Solutions,

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What is YNyn Transformer? and what are the other types in this?

3 Answers  

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cable selection formulas for electrical load.

1 Answers   Bhel,

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How to calculate Maximum Demand from Energy meter Reading.

1 Answers   Etisalat,

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what is the necessity of under ground cables ??

0 Answers  

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what is the difference between LLL and LLLG fault ?

1 Answers  

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what is gapless metal oxide techniques?

1 Answers  

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why corona ring is used in out door switchyard lightning arrestor

3 Answers  

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What is the LUX

2 Answers  

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What is meant by transformer, why it should be used, with out that equipment what happens if we transformed the supply?

12 Answers   Bhel,

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Either It Possible a dc Motor to Run On Ac Drive [ Ex : ACS 800 , Yaskawa F7 ] If it is Possible How Pls Inform Me dinesh_elect_eng@yahoo.com

0 Answers  

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Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

0 Answers  

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