Answer / ram

In pid controller P stands for PROPORTIONAL BAND, I for
INTEGRAL MODE & D for DERIVATIVE MODE. We can also use this
mode for controlling purpose as individual mode. Means we
can use P mode alone or I mode or PI mode PD also. But using
this mode individuals will not provide the desired accurate
output.

So we need to use all the three parameters together to get
good accurate control over process variable.
In this PID mode P(ON-OFF) will try to give the output value
as possible as close to the set value but it will never get
the actual output to the set value. it has some limitations.
So to compensate for the errors remain P mode the I mode is
used. it takes the output value to the set point but after
certain time. it takes some time to get the desired output.
some oscillations are there due to I mode.

So finally to eliminate the damped response of I mode we use
the D mode. it will compensate for the offset error occurs
due to I mode. & try to reaches the desired output level fast.

Answer / muthu

to get free oscillated output for given input, PID
controller uses.

in pid setting, the following parameters are considered.

i) proportional gain, kp
ii) integral gain, ki
iii) derivative gain, kd

what is the reason while warning lamp is on while the engine is cranking?

0 Answers   Jindal,

---

what is instrumentation?

8 Answers  

---

How to isolate a DPT from line in the condition that process must not be disturbed,and process is also critical and no bypass is available.?

4 Answers   Descon,

---

what is positive feedback and negative feedback?

2 Answers   CEPC,

---

in sports(eg,cricket) what is the technique for measurement of speed of the ball thrown by the bowler.

6 Answers   BEL, PSU,

---

why direct mounted pressure transmitters is always installed with DBB ( double bleed block) valve in process line or top of the tanks ?

0 Answers  

---

Why we use 3-15 psi air for control valve input?

2 Answers  

---

we callculat main steam flow by D.P. but where is H.P. & L.P. IN Orfics?

3 Answers  

---

what is the meaning of wet leg & where is it used?

1 Answers  

---

why we are using digital signals for I/O & how to measure this signals is getting or not ?

0 Answers  

---

how u calibate pr tx without master tx?

2 Answers  

---

I have installed a RTD whose length is 2250mm(RTD stem length), but it's upper 200 -250mm is out of the reactor, and this upper 200mm stem is surrounded by atmospheric temp. And the lower portion i.e. 2000mm is in contact with the measuring fluid, then does the final measuring temp. Gonna change as the upper 200mm RTD stem is out of reactor?

1 Answers   Process Control Technologies,

---