SATEC C192PF8-RPR - Manual (Page 55)

Chapter 5 PFC Setup and Operation 50
Normally, the capacitors discharge through fixed resistors that are connected to
the capacitors directly or via auxiliary contacts of the contactors. Refer to the
capacitor data sheet for the recommended discharge time for your capacitors.
The re-connection delay can be adjusted in the range of 3 to 3600 sec. The
default setting is 300 sec.
5.2.4 Arranging the Capacitor Banks
Sizing of the Capacitor Banks
In order to provide reliable operation of the PFC, the sequence of the capacitor
banks should admit different power combinations that must match the reactive
load of your power network. The total power of all capacitor banks should be
sufficient to provide refine power factor correction in worst cases of excessive
inductive load.
It is recommended to use one of the following sequences of the capacitor banks,
where all bank powers are multiples of the power of the first bank:
c, c, c,....c;
c, 2c, 2c,....2c;
c, 2c, 4c,....4c;
etc.
where:
c = the power of the first capacitor bank, kvar;
2c = twice the power of the first capacitor bank, kvar;
4c = four times the power of the first capacitor bank, kvar;
etc.
From the PFC setup menu (see Section 4.13, PFC Setup), specify the power ratings for the
capacitor banks in kvar, progressively, starting from the first sized bank. The capacitor
banks have the same numbers as the output relays to which they must be connected.
The power ratings are not allowed to follow in descending order. Each bank must
have the same or greater size against the previous bank. When entering the bank
power, the starting size is prompted at the power of the previous bank and will not
be allowed to drop below this value.
The sized capacitor banks are not required to occupy adjacent output relays.
They may alternate with permanently switched banks and not connected banks
(see Section 5.1). In all cases, the first bank sized in kvar will be taken as the
reference bank for PFC operations, and all sized banks will be treated in one
sequence.
Adjusting the Bank Rated Power to the Operating Voltage
The PFC calculates the network response to switching operations using the bank
rated powers, normally given for the nominal (rated) voltage. Since the power of
the capacitor banks extremely depends on the operating voltage, the PFC needs
to adjust bank rated powers to the true operating voltage in the circuits.