15
The scope of settings adjustments is
intentionally
limited.
It
is
not
recommended to change the
Airflow
correction
FL
parameter
if
the
combustion is proper, i.e. there are no
underburnt fuel particles.
If the fuel is of
poor quality and there are underburnt
particles, the provided amount of air can be
increased. If the fuel is very dry, causing it
to burn fast, and the furnace burns out too
intensively, the value of
FL airflow correction
can
be decreased.
When adjusting the
Individual
Fuzzy Logic,
values of parameters
concerning: airflow power, feeder
operation and feeder intervals
which can be found in the
Boiler
settings > Output modulation
menu are not used in the regulator
control algorithm. These settings
are used only in STANDARD mode.
When using the
Individual Fuzzy
Logic
control, the fan intake
aperture should be open to the
maximum and the boiler should be
clean. Shall it be necessary to
replace the fan or the feeder, use
identical types thereof.
After
exceeding
the
preset
boiler
temperature by 5 degrees, the regulator
automatically
switches
into
the
SUPERVISION mode.
8.8
Operation in the Standard mode
The ZAB-14 boiler regulator is equipped with
boiler output modulation mechanism, which
allows to change its output gradually, as the
boiler temperature approaches the preset
value. In this mode, the controller uses an
output modulation algorithm. The currently
selected output level - one of three available
- is presented on the display in the form of a
three-bar indicator on the left side of the
boiler icon.
Fig. 10 Output level indicator in the main window.
Parameters for all output levels are available
in the menu:
Boiler settings > Output modulation
Each of the levels - referred to as 100%,
50% and 30% respectively - can be
attributed with different fuel feeding time
and airflow power, which translates into
actual boiler output level. When the boiler is
supposed to operate at specific output level
is determined by values called hysteresis, H1
and H2 respectively. Each of these values
relates to measured boiler temperature
relative to its preset value. The H1 and H2
values can be set in such a way that
modulation
will
take
place
without
intermediate stage, i.e. shift from 100% to
30%
Fig. 11 Output modulation hystereses H1 and H2.
If the boiler temperature reaches the preset
value, the regulator will switch into
SUPERVISION mode.
8.9
SUPERVISION
The SUPERVISION mode occurs both during
operation with STANDARD, as well as with
Individual Fuzzy Logic
control algorithm
.
The
regulator switches into the SUPERVISION
automatically,
without
the
user’s
intervention:
- in the case of Standard control mode -
upon reaching preset boiler temperature,
- during
Individual Fuzzy Logic
control - upon
exceeding the preset boiler temperature by
5°C. In the
Individual Fuzzy Logic
mode, the
regulator strives to avoid switching the boiler
Summary of Contents for ZAB-14
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