SATEC C192PF8-RPR - Manual (Page 50)

Chapter 5 PFC Setup and Operation 45
To specify the bank as a permanently switched bank, set the bank size parameter to On
(see Section 4.13, PFC Setup).
The permanently switched banks are switched in automatically when the PFC is
put into either manual or automatic operation mode and before a switching
program begins, and are switched out when the PFC shuts down, following all
switching and re-connection time delays. These banks remain under PFC
protection but are not involved into either switching program (assumed to be non-
programmable banks).
5.2 PFC Operation
5.2.1 Modes of Operation
The PFC can operate in three control modes: self-adapting automatic mode,
optimizing automatic mode, and manual mode. Both automatic modes provide
automatic power factor (in Power Factor Controller mode) or reactive power (in
Reactive Power Regulator mode) correction whereby the PFC automatically
accounts for deficient or excessive reactive power and makes necessary
adjustments.
Self-adapting Automatic Mode (Auto 1)
Self-adapting mode is a simple automatic operation mode suitable to most
applications. The PFC switches in additional banks when the measured power
factor lags against the target power factor or the measured reactive power is over
the high target kvar (excessive inductive load is detected), and switches out
redundant banks when the measured power factor leads against the target power
factor limits or the measured reactive power is under the low target kvar
(excessive capacitive load is detected).
The capacitor banks are switched in and switched out progressively, always
starting from the low-size bank available at this step, following the pre-set
switching and re-connection delays.
The self-adapting program is complete when one of the following is true:
1. The measured power factor (in PFC mode) or kvar (in RPR mode) attains the
pre-set PFC setpoint range.
2. In PFC mode, the deviation from the target power factor is less than 0.7 of
the smallest size bank.
Automatic Optimization Mode (Auto 2)
This is a highly optimized operation mode that provides minimum switching
operations. At each step, the PFC accounts for deficient inductive or capacitive
reactive power to attain the target power factor or target kvar and selects the
exact combination of the banks among those presently available that requires the
minimum number of switching operations.
Whenever no combination is found that allows achieving the target setpoint
range, the PFC will select a combination that provides minimum deviation from