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Answer Posted / raghuram
1) positioner name it self indicate as for accurate valve
positioning means for opening or closing for example: can
you please assume operator given 30% from HIS, of D.C.S,
WITH positioner accurately we can control valve position at
30% exactly ,with out positioner linearity is not posible.
2) At the time of calibration we will make linear 4 to 20
ma to .2 to 1k.g for I/P, but in case of positioner we will
check position(valve open close) with I/P, with valve
percentage for ex:
ma position(%)
4 0
8 25
12 50
16 75
20 100
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TECHNICAL/ARTITUDE
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.
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