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 the unit of charge and current?

0 Answers  

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what is necessity of using isolation transformer?

4 Answers   NTPC,

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can we connect transformer with star conected secondary to delta connected primary in series?

1 Answers  

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what is the difference between ac and dc?which one is more efficient?and what r their advantages

1 Answers  

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what is ripple component in ac supply?

2 Answers  

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how the B-H loop obtain under the static condition

0 Answers  

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volts=230 c=10mf a=??

0 Answers  

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Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632

0 Answers  

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definition of transponder?

1 Answers  

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can any one explain me the where is the use of plc and scada

4 Answers  

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Hoe to calculate body earthing conductor size ?

1 Answers   IES,

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