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certified service providerFREE WEBCAST - Tune Cascade Loops Simultaneously in Normal Mode (Auto/Cascade)
Tuesday, February 9, 2010
Time: 10:00 am, Eastern Standard Time (New York, GMT-05:00)
This webinar will show you how you can tune Cascade Loops simultaneously in AUTOMATIC mode, using new tools and methods you will see how to set up both loops in Tai Ji, and how to conduct simple, fast tests while your plant is running. These tests will have minimal to no impact on your production.
Compare these 3 Steps the "New Way"
1. With both loops in normal mode (the primary loop in automatic, and the secondary loop in cascade), make a few small changes in the primary loop setpoint
2. Model and simultaneously calculate new tuning for both the primary and secondary loops.
3. Input your new tuning for both loops.
… with these 7 Steps the "Old Way"
1. With the secondary loop in manual, step or bump test the secondary loop by moving the controller output. Watch the primary loop carefully during these tests so that it does not exceed process requirements.
2. Put the primary and secondary loops back in normal mode (automatic/cascade) to allow the process to recover from your tests.
3. Model and calculate new tuning for the secondary loop. Record a 'response time' for this loop so you know how fast/slow to tune the primary loop (relative to the secondary loop).
4. Input your new tuning for the secondary Loop.
5. With the primary loop in manual, and the secondary loop in cascade, step or bump test the primary loop. Watch the primary process value so it does not exceed process requirements.
6. Model and calculate new tuning for the primary loop. Use the 'response time' for the secondary loop such that the primary loop is not too fast.
7. Input your new tuning for the primary loop.
Nomenclature:The primary loop is also known as the 'master', or outer loop (usually temperature or level).
The secondary loop is also known as the 'slave', or inner loop (usually flow).
We will also answer questions such as:
- How much do I have to move the primary loop setpoint?
- Can I automate my testing?
- What if my primary loop does not work in automatic mode (the tuning is really bad to begin with)?
- Can I tune my loops from a disturbance in my process?
- What if I have a valve problem in the secondary loop?
