7 - ELECTRIC SYSTEM215
7.6.2 Battery charger check
DANGER
Before operating on the battery charger, disable the generators start and
cut-off the shore power supply.
This device can operate in a reliable and optimal way, only if following oper-
ations are performed:
• Check that all breakers and indicator lights are working, the wiring does
not present any signs of cuts and all parts are clean and free from oxi-
dation;
• Remove the chassis and check the electronic boards for oxidation. Clean
with deoxidiser if necessary;
• Protect the electric contacts by using an appropriate product (DC4);
• Reinstall the casing after cleaning;
• Check at least once a year the connection of each cable (for loose con-
nections, etc.);
• Keep the battery charger dry, clean and in a dedusted area to ensure a
good dissipation of heat.
WARNING
All maintenance operations listed must be performed only by skilled per-
sonnel.
DANGER
NEVER obstruct the air intakes of the battery boxes, as natural ventilation
must always be allowed so that the batteries do not overheat.
Charge output
For a good operation, batteries must not be discharged below 30-40% of
their capacity, therefore, always start recharging them, when this charge
level is reached.
The battery charger is equipped with a temperature sensor located close to
the batteries. According to the temperature value detected, together with the
value of residual capacity of the batteries, the charger automatically adjusts
the charging voltage according to temperature, thus remarkably increasing
battery life. Moreover, besides the thermal compensation, the battery charg-
er can also compensate the voltage drop due to the dispersion of the con-
nection cables. The battery charger is provided with an integrated warning
light which activates in case certain adjustment values are exceeded.
WARNING
With running engines, the alternators are charging the batteries; so it is
advisable to keep the charger switch set to OFF, in order to damaging the
alternators.
CAUTION
Should the battery voltage drop under 18V, the battery charger will sup-
ply a current corresponding to the 25% of the maximum one and the
recharge time will consequently increase.
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