Rev. 1.00
22586_EDEBD
A0253-0318-1_EN
8
KBR multicomp F144-3 6DO/6RO
Functional principle
1
Functional principle of the controller
The multicomp F144-1V1C6DO6RO-3 hybrid controller has 12 outputs to
control
capacitive
compensation stages. Outputs 1 to 6 are designed to control
thyristor modules (by optocoupler outputs) and outputs 7 to 12 to control
capacitor contactors (by floating relay contacts).
To make optimal use of the thyristor modules' or capacitor contactor modules'
switching performance, you can set the following parameters separately:
for thyristor stages
Switching interval 50 to 9999 milliseconds
Discharge time
20 to 9999 milliseconds
Idle time 20 to 9999 milliseconds
for contactor stages
Switching interval 0 to 10 seconds
Discharge time
0 to 900 seconds
Idle time 0 to 300 seconds
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"
flashing 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 difference corresponds to the set hysteresis (switch-on
and switch-off 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 off 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 configurable time. To prevent alternating switching opera-
tions, you can increase the stage switch-off 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 off after the set delay time.
