Reference Manual
BLR-CX-R / BLR-CX-T
Rev. 07
2018-07
23
311
CONTROL ALGORITHM
1/2/3/4
1.
Automatic: The controller is working with the principle of
„Best Fit“. Before a switching operation, all capacitor-sizes in
step database are compared with control deviation. The
available step which gives the best results will be switched.
2.
LIFO: “Last In, First Out” The controller starts with regulation
with step 1 and is switching further exits step-by-step.
Switching-off is done vice versa.
3.
Combined Filter: Special algorithm for combined filter banks
with two different detuned ratings. The controller is working
like in automatic mode with the principle “Best Fit”. From odd
numbered steps, there is at least or more of the capacitance
connected as from even numbered steps. Threshold level of
each step is checked separately. If steps different sizes, this
can cause inaccuracy. Step recognition is working in this
mode. If steps are detected as defective, they are skipped in
this mode. If this is not accepted, the step recognition has to
be deactivated and capacitor sizes have to be programmed
manually.
4.
Progressive: The controller switches if required, several steps
in sequence with a shorter switching time. From software
1.04, the controller uses independently of the set switching
time always 1 sec. as switching time. Furthermore, the
automatic step size detection is disabled and the step sizes
need to enter by hand. The input of the step sizes should be
as accurate as possible, because the regulator would
otherwise tend to oscillate. Leaving the "Progressive"
algorithm and use a different algorithm, the set switching
time is used the step size detection is re-enabled.
312
OFFSET REACTIVE POWER
Ct*Pt*7000
OFFSET of reactive power in kvar. This feature allows compensating
a permanent reactive load, which cannot be measured (e.g. a
transformer).
The offset of reactive power affects the readings of the following
measuring
values:
current, reactive power, control deviation, apparent power, power
factor PF and cosφ.
