ABB PQFS Installation, Operation And Maintenance Instructions page 26

3 DC voltage power supply 24V
4 CT connection terminal
5 Preload circuit resistors
6 Main earth connection point
7 IGBT inverter with DC capacitors
8 PQF main controller board
9 IGBT heat extraction fans
10 PCB EMC neutral
11 PCB EMC line
12 PCB output filter preload
13 Main power supply terminals (phases) (underneath
controller boards)
14 Main power supply neutral connection (not
mandatory) (underneath controller boards)
15 Auxiliary transformer
16 Fuse preload circuit
The PQFS filters are provided with the preload circuit and the output filter mounted on
a PCB. This design substantially reduces the time needed for replacement of the same.
It also gives a more robust design compared to the previous generation of filters. The
power supply to the exhaust fan at the top of the filter are connected to the terminal
block shown which make the replacement of the same easy during periodic
maintenance.
The fuse on the PCB is of very special characteristics and must be replaced only with the
same type. Please refer to our recommended list of spare parts.
The preload circuit is shown in
26 Hardware description  Manual Power Quality Filter PQFS
Figure 15.
1 3
Figure 15 Preload circuit main components
U002
X21
R1, R2
-
U01
A005
M1, M2
A003
A002
A001
L1, L2, L3
N
T001
PF1, PF2
6
5
4
2