Answer / arindam bhattacharya

cascade Conlrol is one controller's output goes to another
controller's set point.

Answer / bertong_bayawak

a cascade controller means there is a 2 controller with its
primary controller's output, is the setpoint of the
secondary controller, where the desired controls takes
place.

Answer / kumar

A cascade control system is a multiple-loop system where the primary variable is controlled by adjusting the setpoint of a related secondary variable controller. The secondary variable then affects the primary variable through the process.

Answer / www.islamqa.com

# The cascade control is a control strategy used to have
more stabilization in the control loop.

# Actually we don't need to wait till we have an error in
Pv to start the corrective action, the secondary controller
start responding for any small load disturbance, so we have
more predictable response and more stabilized loop.

# For the loop structure, we have the primary control loop
(master controller) give its o/p to the set point port of
the secondary control loop (slave controller) & the o/p of
secondary controller is connected with the final control
element.

# A good example for cascade is: any process with
controller and the final control element is a "valve with
positioner", here we have the secondary contoller is the
positioner itself which has a secondary closed loop with
the valve.

Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310

Answer / ghulam muhammad

Casecade loop is used where the one variable is affected by
other variable and also for slow process.this is series
arrangement of two or more loops in wich the output of one
controller becomes the setpoint of secondray controller for
correcting the manipulated variable.

Answer / raj

it predict the changes in the controller before they occur
and makes neccessary corrections before only.

Why we are using reverse action in displacer types level transmitters on some Vessels?

0 Answers  

in transmiters(rose mount) how to check output 4-20ma ? and input 24v? i need exact explanation?

2 Answers   Adhunik,

1.In which princeple DP transmeter works? 2.Why UPS system is use for DCS? 3.How drum lvel controller works? 4.What is the difference between glob valve and gate valve? 5.How axial shift probe work & in which princeple it works?

1 Answers   Luberef, Qatar Gas, Reliance,

Draw a wheatstone bridge circuit showing supply, meter and 3 wire RTD connection

0 Answers   CCIE,

my data card only does run in my mobile so how can change it that it run other mobile & computer and i can stor data in my data card

0 Answers  

GIVE BRIEF DESCRIPTION ABOUT "DCS"

2 Answers  

How LVDT position transmitter works on DC supply(24vdc) from DCS, whereas transformer operates on AC supply? pls help..

1 Answers  

HOW FOREIGN CONTROL SYSTEM CAN BE CONNECTED WITH DCS?

0 Answers  

Basically iam Instruemntation Engineer, but Iam interested in Instruments design engineering, so plz guide, is there any course, training or Softwres to become Instrument design engineer??.

0 Answers   Honeywell, Tata Steel Limited,

what is start up vent valve ? why it is used in boiler?

8 Answers   ACC, Bhushan Power Steel,

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

0 Answers   Bapco Bahrain Petroleum Company,

What is PID tunning

2 Answers   EID Parry, MFL,