User`s guide

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Appendix B - Loop Application Examples

PID Control Algorithms

244 UMC800 Control Builder User’s Guide Release E

1/01

Example 9 - Cascade control of a boiler drum level - basic

Steam Drum

M

LT 1

Feedwater Flow

FT 2

Steam

Note: All physical

connections are by

I/O cards

FAIL

FAIL

Example 10 - Cascade control of a boiler drum level - 3 element feedwater control

M

Feedwater Flow

FT 2

Steam

Note: All physical

connections are by

I/O cards

LT 2

LT 1

Steam Drum