DC Power Technologies FS3 Version 3 - Technical Hardware Manual - Manual (Page 21)

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Electrical Interconnection
FS3
The FS3 electrical interconnection differs at the AC input stage of
the charger depending on the model. UL listed models feature the
AC Filter Board, while the standard non-UL models distribute AC
via a terminal block.
Aside from the AC supply filtering and distribution, the two variants
share the same internal circuitry.
FS5 & FS9 AC Filter Boards are non-configurable.
FS3xU AC Input: AC Filter Board - UL models only
Each phase of the AC input supply is connected to the charger
module bays via the AC Filter board, the AC Loom and a connector
on the backplane. Incoming earth is connected to the internal
chassis via a mounting screw on the AC Filter board.
The FS3 AC Filter board allows for re-configuration of the incoming
phases to allow for a number of AC input types, explained in detail
in the Hardware Configuration section.
The auxiliary power supply is connected via the AC Loom from
either J5 or J6 on the AC Filter board depending on the mains
supply configuration of the charger.
FS3xN, FS3xJ AC Input: Input Terminal Block –
Standard models only
Non-UL models distribute the AC phase and neutral to each of the
three module bays via a din rail mounted terminal block. The Input
Terminal Block also provides an AC supply to the Auxiliary Power
Supply Unit. Jumpers are required to be fitted correctly depending
on the AC supply type. See the Hardware Configuration section.
Incoming earth is tied to the earth stud on the internal chassis.
FS3 DC Output Circuitry: All Models
Individual DC outputs from each charger module are connected in
parallel with 9 mm² cables to the output bus bars. Fuses and a
crowbar diode mounted on the bus bar assembly provide reverse
polarity protection. Two voltage-sensing PCBs fitted either side of
the fuses enable the MPC to determine if the fuses are blown.
The final internal connections to the SB350 output connector are via
short lengths of 50 mm² cable.
FS5 & FS9
The FS5/9 input circuitry consists of a non-configurable AC Filter
board distributing each AC phase via dedicated looms to each of
the backplane and auxiliary power supply. No neutral is supplied to
the backplane.
Incoming earth is connected to the internal chassis via a mounting
screw on the AC Filter board ground plane, and the backplane loom
earth wires are all tied to a stud on the internal chassis.
DC output circuitry consists of copper bus bars carrying DC current
via fuses, current shunts and 70mm
2 cable to the output
connector(s). Models with output capability exceeding 300A utilize
parallel output circuits terminating with two output connectors.
Fuses fitted in-line with the bus bars are each 180A and provide
reverse polarity protection with a 300A crowbar diode fitted across
the output.