Cleaver-Brooks ClearFire CFLC Series, Operation And Maintenance Manual, Page: 249 / 290

Appendix E Falcon Lead Lag
E-41
Add-stage request An Add-stage method implements the criteria for adding another stage. Criteria that may apply
are the firing rate of a stage or stages vs. a threshold, the amount of operating point versus setpoint error seen
by the master, the rate at which setpoint error is developing, and the rate at which a stage or stages are
approaching their maximum or baseload firing rate.
Typically these use Add-stage detection timing to determine how long these conditions have persisted. When
all criteria have been met for a sufficient time, then an Add-stage request is active.
Drop-stage method
Drop-stage detection timing
Drop-stage request A Drop-stage method implements the criteria for dropping a stage. Criteria that may apply are
the firing rate of a stage (or stages) vs. a threshold, the amount of operating point versus setpoint error seen by
the master, the rate at which setpoint error is developing, and the rate at which a stage or stages are
approaching their minimum firing rate.
Typically these use Drop-stage detection timing to determine how long these things have persisted. When all
criteria have been met for a sufficient time, then an Drop-stage request is active.