SATEC C192PF8-RPR - Manual (Page 54)

Chapter 5 PFC Setup and Operation 49
defined setpoint operate delay. This makes the trigger less sensitive to fast
changes in load thus avoiding excess switching.
The operate delay timer is reloaded each time the measured power factor
oversteps the setpoint range limits.
The allowable range for the operate delay is 1 to 3600 sec. The default value is 3
sec.
Low Lacking Reactive Power
To avoid excess cycling, the power factor setpoint will not trigger the PFC if the
lacking reactive power is less than 0.7 of the lowest-size bank (usually with no
load or in presence of very low load).
5.2.3 Switching Block Delays
All bank-switching operations are performed following safety block delays in order
to avoid excess transient voltages and currents, and to prevent possible damage
to the contactors and capacitors.
Switch-on Delay (Connection Interval)
This is the amount of time after the capacitor bank switches in during which the
following switching operations are prohibited.
The PFC will not perform either connection or disconnection of the banks until the
switch-on delay timer expires. This avoids multiple switching of the capacitor
banks that would otherwise cause excess current pulses.
The switch-on delay can be adjusted from 3 to 3600 sec. The default setting is
600 sec.
Switch-off Delay (Disconnection Interval)
This is the amount of time after the capacitor bank switches out during which the
following switching operations are prohibited.
The PFC will not perform either connection or disconnection of the banks until the
switch-off delay timer expires. This avoids multiple switching of the capacitor
banks that would otherwise cause excess transient voltages and currents in the
circuits.
The switch-off delay can be adjusted from 3 to 3600 sec. The default setting is
600 sec.
Re-connection (Re-close) Delay
This is the amount of time after the capacitor bank switches out during which the
re-connection of the bank is prohibited, in order to allow the capacitors to
discharge. This avoids bringing the still-charged capacitors back after the voltage
is restored that would otherwise cause permanent damage to the contactors and
the capacitors because of extremely high over-voltage.