Vaisala WMS302 Guía de usuario descargar pdf (Pagina 227)

Chapter 8 ____________________________________________________________ Technical Data

VAISALA______________________________________________________________________ 225

If the primary cell setting is detected, the charger circuitry of the logger

is completely shut off to protect the battery from reverse currents.

Lead Battery Charger Operation

The charger has three operating modes when a lead battery is detected:

Normal Charge, Quick Charge and Float Charge. When the logger

starts, it first checks the battery type, and if lead is found, the charging

task starts and is performed once a minute.

Normal Charging

At first, the charging task always enters Normal Charging mode. In

Normal Charge, charging voltage is set to 6.85 V corrected with

temperature coefficient. Charging current is set to 300 mA, 500 mA, or

700 mA depending on the battery capacity.

If the battery is accepting certain amount of charging current and there

is enough energy available at +ExtDC input, the charging task enters

Quick Charge mode. In the opposite case, when the charging current

drops below 0.0075 CA, even if more energy would be available, the

charging task enters Float Charge mode.

If the battery is discharging (charging current is negative), the charging

task always enters Normal Charge mode.

NOTE

Short pins 3 and 4 in the internal battery connector with jumper or

preferably use a special pin header for correct battery type sensing.

CAUTION

Never connect voltages higher than 10 V between the terminals

+BATT and GND as this may damage the logger electronics.

NOTE

If the internal temperature of the logger is below -20 °C (-4 °F), the

charging current is limited to 100 mA regardless of the battery

capacity.

NOTE

After powering up or reset, it takes several minutes to calculate the

remaining capacity of the battery if the charger remains in Normal

Charge mode.

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Vaisala WMS302 Guía de usuario Pagina 227