KBR F144-MS-1V1C1TI6DO-3 - Functional Principle of the Controller

Rev. 1.00
22585_EDEBDA0252-0318-1_EN
8
KBR multicomp F144-3 6DO/12DO Functional principle
1 Functional principle of the controller
The controller's microprocessor records the mains voltage and current con-
sumption of the entire plant by measuring transformer inputs (A/D converter)
and, on the basis of this, calculates the active and reactive power ratio of the
power supply. The controller operates in four quadrants.
 Energy recovery in generator operation is detected and indicated by a "G"
ashing on the LCD display. While in generator operation, compensation to
cos phi 1.00 (output cos phi) is performed. To prevent alternating switching
operations, this target cos phi is maintained for 15 minutes after generator
operation ends.
The compensated power required for the target cos phi is calculated contin-
uously. If the power dierence corresponds to the set hysteresis (switch-on
and switch-o hysteresis), the stages are switched depending on the required
compensation power. Manually switched stages are, however, not included in
the optimization. In case of identical stages with identical power, the stage that
has been switched o for the longest time is switched on.
Having fewer switching operations results in optimum adjustment. Even for
large systems, sensitive controls can be set up with just a few modules. Stage
ratios do not need to be considered. After compensation, switching operations
are interrupted for a congurable time. To prevent alternating switching opera-
tions, you can increase the stage switch-o delay by up to 150% of the smallest
stage's power.
In light load operation (secondary measuring current under the limit), the stag-
es are switched o after the set delay time.
The integrated temperature measurement input monitors the temperature in
the reactive power compensation system and causes the fan to be switched on
if a predened temperature threshold is exceeded and switched o again when
the temperature drops below the reset temperature.
To prevent the fan from switching unnecessarily often, it has a run-on time of
30 minutes. You can switch the fan (output 6 or 12, depending on the device
version) on or o permanently in the "Stage state" menu. If you select "Auto",
the fan output is controlled by the temperature measuring input.
You can also protect the system by dening a switch-o temperature. This
makes it possible to switch stages o in time if there is a risk of damage due
to overheating. Once the temperature drops below the reset temperature, the
stages are switched on again one after the other.