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1.what is the role of proportional comtroller in pid
controller?2.How do u calibrate the control valve?
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Answer Posted / krishna
proportion control function is to maintain constant offset
between set point and process variable .but it cannot remove
the offset. it makes the p.v to oscillate between high and
low limits.
There are two things required for calibrating control valve
1)pneumatic tester ( signal :0.2 to 1kg /cm2
)
2) air supply source according to design of valve.
initial for 0.2 kg.cm2 valve should be (open or close )
according to ATO ATC) )
THEN CHECK POSITION AT 25 50 75 100 % OF VALVE ACCORKING TO
SIGNAL TUNE WITH POSITIONER
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