SATEC C192PF8-RPR - Manual (Page 51)

Chapter 5 PFC Setup and Operation 46
the target. When no leading (capacitive) target power factor is allowed, only
combinations that provide lagging (inductive) power factor will be checked.
The banks are connected and disconnected starting from the low-size banks,
following all pre-set switching and re-connection delays. Alternation of switching
operations is provided when needed to avoid excessive deviation from the target
power factor.
The optimization 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 lowest-size bank.
3. The optimal combination may not be achieved. The controlled power factor
or kvar is brought to the value that is as close as possible to the target.
Manual Mode
This mode can be used for manual adjustment of the power factor or kvar and for
testing purposes. In manual operation mode, power factor or kvar correction is
triggered by user commands entered from the front panel (see Section 4.14, PFC
Manual Mode Menu) or through communications. Each command switches in or
switches out a single capacitor bank. When there are no banks that can be
operated or an alarm condition is present, the user command is discarded.
The banks are switched in and switched out progressively, always starting from
the lowest-size bank available, following the pre-set switching and re-connection
delays.
Manual Mode is a safe, fully protected operation mode provided that the setpoint protection
overrides especially dedicated to the PFC are also operational here. Whenever the
capacitor banks are protected through the alarm setpoints and an alarm override condition
is present, the manual command will be overridden resulting in immediate or soft switch-off
of the capacitor banks.
Changing the Operation Mode
From the PFC setup menu (see Section 4.13, PFC Setup), set the operation mode
parameter to the desired mode. This entry is always enabled unless the PFC is in Shut
Down mode.
Changing from one operation mode to another mode can be done while the PFC
is running, with no need to shut it down. The new program will start immediately
from the present point achieved. No extra cycling will be made if the previous
automatic program was completed. Changing to Manual Mode will stop all
switching operations.
After changing to an automatic mode, the disconnected capacitor banks will be
put into operation after the full discharge time.
The PFC setup options (as well as certain basic configuration options) may not be changed
while the PFC is running.