5
parameter
St_P
. Via button
▲
move to another stage and
LED2
will turn ON. Repeat the same procedure the same way like for
the first stage. Following the same control or setting of all stages should be done. At the end press button
SET
until value of
power factor will appear on the display.
13.
If everything is set correctly, on the display is shown real instantaneous value of power factor. Regulator is ready for operation.
Other parameters may remain on having the default values, that were made by the manufacturer. In the case that further changes
are necessary, the user should follow detailed manual given in chapter 6.
4.
Description of the function
Device digitizes measured phase to phase voltage between two phases and current in the measured phase. Then, from those
values, parameters like: power factor, effective values of voltage and current, harmonic distortion of voltage and current, are
being counted. Calculation of the needed compensation power is done by using the value of allowed reactive power, which is
set in the device in the form of requested power factor. According to its size, regulator will switch on or switch off
appropriate capacitor stages.
Within the scope of each power level, regulator uses method of circle switching. All the time connects this stage at
appropriate power level which was switched off for longest time. Everything is made so that regulator will reach optimal
compensation in one regulation cycle with minimum number of switched stages.
The regulator makes harmonics analysis of current and voltage up to 19
th
harmonics and counts THD factor of voltage and
current.
The regulator can operate not just with compensation capacitor stages, but also with de-compensation reactor stages as well,
at the same time. The power of these reactor stages will be registered with the negative numerical sign. De compensation
reactors has to be connected after last capacitor stage. If the automatic detection of the powers is not possible, these values
could be also set manually. For more details, follow the manual in chapter 6.
5.
Installation of the device
Regulator PFC is designed in metal box, which provides perfect EMC shielding. Regulator's design also provides panel
mounting, into the hole 138 x 138 mm. The connection of the wires is from the back side of regulator, to the terminals box.
Measuring and auxiliary voltages are being taken from supply voltage, which must be protected by fuse of gG type 6A.
Picture 3: Connection of measuring circuits Picture 4: Position of PFC controller in the system
Location of the current transformer has to allow both current of the load and the current of the capacitor to be measured
together. Correct location is shown on the picture 4 as well as examples of wrong location.
The complete connection is shown at the picture 5. There is only one rule that should be considered. Stages with the same
power have to be connected side by side. For example:
1
st
step
2
nd
step
3
rd
step
4
th
step
5
th
step
6
th
step
6.25 kVAr
6.25 kVAr
12.5 kVAr
-
25 kVAr
25 kVAr
However, ranging the powers in accordance is not necessary. There could be even gaps between particular power levels. For
example, stages 1 and 2 could be connected, then step 3 disconnected, steps 4 and 5 connected and so on.
