Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / 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 |
Post New Answer View All Answers
draw shematic diagram of c/v positioner(smart type)?
How will you calibrate an Absolute Pr.Transmitter of range 400mmHg absolute ?
What is the formula of vabration sesore. i mean how to covert mils to volt plz share if any body knows very argent : my mai is merajalam143545@yahoo.com
Describe the functions of the Operator Interface including the considerations related to alarming and display layout/configuration/layers.
describe flow nozzel principle?
Why is the orifice tab provided?
the whole paper was based on Transducers..questions like define repeatability, error,accuracy,precision..den there were many q. on the conversion of Pa to mmHg and other units.. also..der wer few Q. on some level sensors(with diagram)
how pressurize drum calibrated ?
How to Calibrate Vortex Flow transmitter in field
in differential pressure transmitter,min&max pressure range for hp&lp
Manipulation of dead wt. tester double piston type.
how u calibrate sox nox co2 co in cemps?what is opacity n HPm?tell the standard parameters of cems?
How to calibrate Magnetic flow Transmitter in Field
when placing a vent or drain hole on an orifice plate should you measure from the center of the bore up or down for the vent placement?
how many types of spped sensors n vibration sensors?their basic principle n connection?
