Tell me about PID Tuning and what is PID.
Answers were Sorted based on User's Feedback
Answer / karthika
Tunning is a process in which we adjust the controller parameters(Kp,Ki,Kd) so as to obtain desired performance of the controller.
different tyes of tunning:-
1. Zigler-Nicholes method
2. Cohen Choon
3. 1/4 decay ratio
Is This Answer Correct ? | 9 Yes | 0 No |
by the help of P we calculate the error signal
Error signal=SP-PV (How Much)in the timming of pid tunning.
By the help of I we Remove the offset error-it will decide
how long the error exit in the cycle inthe timming of pid
tunning.
And by the help od D we fasten the control action-it will
decide how fast the control action to remove the error
without any overshoot for failure cycle.
at last
P=How Much(present)
I=How Long(past)
D=How Fast(future)
Is This Answer Correct ? | 9 Yes | 0 No |
Answer / www.islamqa.com
Actually we can make it simple:
# P:
it's a controller gain which modify the controller o/p
proportional to the error.
# I:
it's a controller gain which modify the controller o/p
proportional to the integral of the error.
# D:
it's a controller gain which modify the controller o/p
proportional to error rate of change.
We have 4 parameters in our control loop to focus on:
1 - the rise time: the period of time during which the pv
get 90% of the desired sp value
2 - max overshoot
3 - settling time: the period of time during which the pv
get the desired sp value and saturate.
4 - error/offset
we can get it clear from this pic:
http://controls.ame.nd.edu/ame437/S2003/hw1/specifications.j
pg
Now we will take a look about the effect of each controller
gain on these parameters:
# P gain:
decrease rise time
increase max.overshoot
increase settling time
decrease error (but not eliminate)
# I gain:
decrease rise time
increase max.overshoot
increase settling time
eliminate error.
# D gain:
no effect on rise time
decrease max.overshoot
decrease settling time
decrease error.
the previous is guidelines to be in background while
dealing with PID,but they are not sharp limits.
Regards,
Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310
Is This Answer Correct ? | 7 Yes | 0 No |
Answer / sumit sharma
pid is proportional integrative derivative
pid is a closed loop system which is used for error checking of analog devices only, it cant used on digital devices.
pid consistes of
kp proportional
ki integrative
kd derivative
in pid tuning first kp,ki,kd is taken as any integer and then error is checked by the pid formulae
if there is error then the values of kp ki kd can be changed to give the error 0
Is This Answer Correct ? | 8 Yes | 4 No |
Why plc require in analog input 4-20amp & 0-10 volt?
what is purpose of three way manifold valve using for dp transmitter
what is a boiler tube leakage detector? ... what is the working principle ?
How is plc installing done
how in the 2 - wire transmitter, 24v supply and the 4ma signal gets in the same path?
what is the name of thermocople element cable from field to pannel end?
what is consistency transmitter and describe its working?
Working principle of magnetic flow meter ......and calibration procedure of e+h magnetic flowmeter...
How many mode are in ups?
Draw a complete P&ID of a flow suction tank indicating all control & protection equipment. Indicate all its inlets and outlets. Explain the controls for this system
What is Fieldbus?
how can you change unit of totalizer in siemens mag 5000 flow meter?