What is Cascade Control?
What is Cascade Control?
A quick visual guide for instrumentation beginners.
A quick visual guide for instrumentation beginners.
Why It’s Needed
Why It’s Needed
Single-loop control reacts slowly to disturbances → unstable process
Single-loop control reacts slowly to disturbances → unstable process
The Core Idea
The Core Idea
Cascade control uses
two controllers
for faster correction
Cascade control uses
two controllers
for faster correction
How It Works
How It Works
The
Master Controller
controls the main process variable → sends setpoint to the
Slave Controller
The
Master Controller
controls the main process variable
→ sends setpoint to the
Slave Controller
What the Slave Does
What the Slave Does
The slave controller corrects disturbances
before
they affect the main loop
The slave controller corrects disturbances
before
they affect the main loop
Simple Example
Simple Example
Temperature (master) controls → Steam Flow (slave) Result: stable temperature even with steam fluctuations.
Temperature (master) controls → Steam Flow (slave) Result: stable temperature even with steam fluctuations.
Benefits
Benefits
✓ Faster disturbance rejection ✓ Better stability ✓ Improved product quality
✓ Faster disturbance rejection ✓ Better stability ✓ Improved product quality
Cascade control = two loops working together — one protects the process, the other reacts in advance
Cascade control = two loops working together — one protects the process, the other reacts in advance
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