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Question
How much should be the values and/or percentages of these 
given below factors for a good controller ?

Steady state error
Delay
Rise Time
Overshoot 
Peak Time
Settling Time
Damping
Oscillations & vibrations

thanks
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
A proportional controller (Kp) will have the effect of
reducing the rise time and will reduce ,but never eliminate,
the steady-state error. An integral control (Ki) will have
the effect of eliminating the steady-state error, but it may
make the transient response worse. A derivative control (Kd)
will have the effect of increasing the stability of the
system, reducing the overshoot, and improving the transient
response.


for full details visit

http://www.engin.umich.edu/group/ctm/PID/PID.html
 
Is This Answer Correct ?    2 Yes 0 No
Rajkumar
 

 
 
 
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