Answer / mangesh

Deviation of controlled variable from set point.

Answer / mugil

Offset is nothing.Error of controller is called offset.

can u plz send me technical questions asked in SCHNEIDER ELECTRICAL technical paper?

0 Answers   TCS,

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pls any1 sugges me book for plc,dcs & scada..

1 Answers  

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In 2 wire transmitter 1 wire is used for power and other is used for signal( 4-20)ma In 4 wire transmitter 2 wires are used for power and 2 wires are used for signal (4-20)ma . but my question is "what is the criteria or parameters we have to consider while selecting these transmitters for eg( distance, safety zones etc.

1 Answers  

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why relays are used with plc?

4 Answers  

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if my 6 kva UPS gives 20 min. backup at 100 % load, then at 25% load what is the backup time?

17 Answers  

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what is PID n give me brief info. about P&I&D.

2 Answers  

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in valve is constructed as per SME B 16.34, then which standard is used for fire testing of valve?.

0 Answers  

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on which principle control valve works?

3 Answers   Lupin, Reliance,

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what u mean by speed control in turbin? how it was working?

2 Answers  

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What kind of feedback is used in DP cells.

1 Answers   CCIE,

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i am working in the automation company...i want to just know how actully pid control valves are tune????...

1 Answers  

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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.

0 Answers   MNC,

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