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A three-stage charger is the fastest charger. It charges the battery at a constant current until
the battery voltage reaches a slightly elevated level. The battery is maintained at this voltage
while the charging current diminishes to a low value, and then the battery is switched to the
float voltage where it can be maintained indefinitely. However, the charger cannot differenti-
ate between a current going to a load on the battery, or being absorbed by the battery, so
it can overcharge a battery supplying current to a load. A two-stage charger is preferred for
“loaded” batteries and a three-stage for idle or unloaded batteries during recharging.
All of Analytic Systems’ chargers include adjustable output voltage for charging standard or
deep cycle lead-acid, VLRA or gel type batteries.
Troubleshooting
This unit provides LED indicators and a buzzer to help diagnose any problems. The unit should
sound the buzzer to alert you prior to shutting itself down. You should immediately check the
indicators to determine the cause of the shutdown.
CHARGING
Indicates that the battery charger is charging the batteries:
If the LED is not on, the batteries may be fully charged and the charger is
supplying a float voltage to the batteries to keep them fully charged.
LOW OUTPUT
Indicates that the output voltage is below normal because:
The current demanded by the devices connected to the unit exceeds the
maximum output current rating, causing the output voltage to drop to
maintain the current at the maximum level,
The input voltage is not high enough for unit to operate,
LOW INPUT
Indicates that the input voltage is below normal because:
The input voltage is not in the correct range for proper operation of the unit.
OVER HEAT
Indicates that the Battery Charger is running too hot because:
Too much power is being drawn, turn off or unplug some devices.
The Battery Charger is located in a poorly ventilated area.
If the load exceeds the continuous rating for too long a period, the temperature sensor inside
the unit will turn off the outputs. After the unit cools sufficiently, it will automatically come
back on. If this happens frequently, remount the unit for increased airflow so it cools better.
