Volvo Penta D9-425, Operator'S Manual

Page: 65 / 88

63
Maintenance. Electrical system
Electric welding
Remove the positive and negative cables from the
batteries. Then disconnect all cables connected to the
alternator.
Also undo the connector for the EVC system from the
control unit.Press the lock tab down and pull the
connector out.
Always connect the welder earth clamp to the compo-
nent to be welded, and as close as possible to the weld
site. The clamp must never be connected to the engine
or in such a way that current can pass through a bearing.
IMPORTANT! After you have finished welding,
re-connect the EVC connector and the alternator
terminals
before you connect the battery cables.
Electrical installations
An incorrectly done electrical installation can generate
stray currents from the electrical system. Stray cur-
rents, in their turn, can weaken the galvanic protection
of the propeller, propeller shaft, rudder, keel etc., and
cause damage because of electrochemical corrosion.
IMPORTANT! Work on the low voltage circuits in
the boats should be done by a person with elec-
trical training or knowledge. Installation or work
on land current equipment
must only be done by
a competent electrician, in accordance with local
regulations for mains electricity.
Always consider the following:
1. If land current is connected, its protective earth
must be connected ashore, never to the boat. The
land current installation must also be provided
with an earth fault breaker (RCCB). The land cur-
rent installation (transformer, inverter, battery
charger etc. ) must be intended for marine use,
where the high voltage section is galvanically
isolated from the low voltage section
.
2. Electrical cables must be installed and clamped in
such a way that they are not exposed to chafing,
damp or splashing water in the bilge.