Answer / rajkumar

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

why pneumatic control signal output is use 0.2 to 1 kg/cm2

3 Answers   Jindal,

---

How to get Cv of control valve having following parameter ,i.e inlet pressure 4.5kg/cm2 outlet pressure 1 kg/cm2 specific gravity 0.808

3 Answers  

---

For what reason would you possibly be compelled to make use of a Smith Predictor. Explain the idea behind the operation of this device.

0 Answers  

---

How can we measure the level of a closed system like drum

3 Answers  

---

Is an analogue only transmitter as accurate as a smart transmitter?

2 Answers   SCA,

---

what is difference between RTD and Thermocouple?

2 Answers  

---

How oil line flow measured?eplain about instruments used and working principle?

0 Answers  

---

Hot calibrate a level transmitter (wet & dry legs)?

1 Answers   Honeywell, IEC,

---

What is feedback system.

1 Answers   CCIE,

---

What is cascade control in process instrumentation?

4 Answers   Engineers India, ITC Infotech,

---

Which softwere is required to communicate the S7-300 processor

4 Answers  

---

what is maximum temprature in instrumentation

1 Answers   Sabic,

---