Furuno FV-110, Operator'S Manual

Page: 197 / 240

Alternative grounding for aluminum hulls
F-5
F.4 Alternative grounding for aluminum hulls
The following guidelines assume a two-wire, isolated grounding arrangement; that is no
part of the circuit, in particular the battery negative, is connected to any ground potential
or equipment.
F.4.1 To ground the ACU
The ACU should preferably be grounded with the short cable. Further, the ACU must be
grounded at its grounding stud to ensure a proper grounding if the short ADU cable is
disconnected.
The ground connection must be established at a dedicated RF ground (either capacitively
or electrically coupled).
The ACU provides galvanic isolation (as required) from its input power terminals to the
chassis/grounding stud. This way the isolated grounding arrangement is maintained.
F.4.2 To ground the ADU
If the mounting base of the ADU is electrically connected to the hull (or any other ground
potential than the ACU), the ADU must be isolated at its mounting bolts by means of
shoulder bushings and washers, see F.6.3. This is done in order to prevent DC currents
flowing in the hull thus causing electrolytic corrosion.
However, a ground connection must be established via one of the mounting bolts using a
separate ground cable. The ground cable must be routed parallel and in close proximity to
the shielded coax cable hence connecting the ADU to the ACU Grounding kit. A heavy
gauge wire with tinned strands (min. 6 mm
2
) can be used for this purpose.
Important
Remember to make the ADU ground connection at the
same electrical ground potential as the ACU (see To
ground the ADU ).
Figure F-4: Alternative grounding for aluminium hulls
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