7.9.2 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 operations 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 oxidation;
• 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 chassis after cleaning;
• Check at least once a year the connection of each cable (for loose connections, 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 personnel.

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 charger can also compensate the voltage drop due to the dispersion of the connection 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; it is advisable to keep the charger switch set to OFF, in order to avoid damaging the alternators.

CAUTION

Should the battery voltage drop under 18 V, the battery charger will supply a current corresponding to the 25% of the maximum one and the recharge time will consequently increase.