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Control algorithms
5 different control algorithms are available in the CX plus. The control algorithm used by the controller
can be set in the SETUP menu 311:
1 = BEST FIT (default)
2 = LIFO
3 = COMBI FILTER
4 = PROGRESSIVE
5 = FIFO
BEST
FIT
(AUTO)
The controller works according to the
“BEST FIT”
principle (best result). This means that, before each
switching operation, the controller compares all stage sizes saved in its stage database with the
determined need for reactive power and always selects the stage which comes closest to the set control
target. If the controller has connected stages of the same size, the number of switching operations is
distributed automatically to these stages either via the switching cycles or via the operating hours
(SETUP/315).
Blocked defective stages (
“FAULTY”
) and stages with the stage type
“
FON
” and “
FOFF
” are skipped
by the control. If a stage is identified as defective and blocked (
“FAULTY”
) after being switched on 3
times, this stage will be skipped by the control. Stages which have been switched off by the alarm
system via the stage switch-off sequence and have been locked for max. 30 min. are also skipped.
If stages which have been identified as defective are not locked, the function
“
Lock faulty stages
”
(SETUP/309) must be deactivated. Otherwise, the affected stage will be switched on and off
unnecessarily.
!
CAUTION
The defective stage is switched on and immediately switched off again. If the control target has not
been reached yet, the affected stage is continuously switched on and immediately switched off again
in the cycle of the switching time. The control oscillates.
!
CAUTION
A faultless stage may be switched on and off alternatingly with a defective stage. The control
oscillates.
