Answer / inbu raja e k

cascade control strategy is the one in which you have 2
control loops, a primary loop and a secondary loop. The
output of the secondary controller will the reference or
set point to the primary controller.
Cascade control is most advantageous on applications where
the secondary closed loop can include the major disturbance
and second order lag and the major lag is included in only
the primary loop. The secondary loop should be established
in an area where the major disturbance occurs. It is also
important that the secondary variable respond to the
disturbance. If the slave loop is controlling flow and the
disturbance is in the heat content of the fluid, obviously
the flow controller will not correct for this disturbance.
In distillation column it is used as a composition control
where the feed flow is the primary control and condense
flow out is the secondary loop

Answer / amit123.inc

Dear Inbu Raja E K-Actually the output of the primary controller is used as the reference or setpoint for the secondary controller.

why fuse block is not used for AI signal?

0 Answers  

---

why to use 3 wire at RTD ? what's the reason for common wire ?

4 Answers  

---

IS there any effect of vortex in low pressure side of the transmiter after the orific in feed water line? if yes then what is the calculation?

0 Answers  

---

why vortex flow meters and electro magnet flow meters are used in water treatment plants

1 Answers   Elite Construction,

---

Is it possible to convert 4 wire transmitter to convert to 2 wire with additional relay.Please send detial with drawing,i will appreciate.

2 Answers  

---

what is dedband in instrumentation ?

3 Answers  

---

What is a flow meter?

2 Answers  

---

Why ues 250 ohms Resistor during hart type instruments calibration with hart protocol in details ?

5 Answers  

---

diff c and c++

1 Answers  

---

what is function of DCS , and how is it work , explain with difination

1 Answers   Bapco Bahrain Petroleum Company,

---

what is the meaning of potential free contact. difference between dry and wet contact?

6 Answers   GAIL,

---

what is the difference between dcs & plc

2 Answers  

---