Vaisala WMS302 Betriebsanweisung PDF herunterladen (Seite 228)

User's Guide ______________________________________________________________________

226 __________________________________________________________________M210630EN-B

Quick Charging

The purpose of the Quick Charge mode is to fill the battery as quickly

as possible using a specified quick charge voltage for lead batteries. In

Quick Charge, the charging voltage is set to 7.35 V corrected with

temperature coefficient. Charging current is typically the same or one

step higher as in Normal Charge mode.

When the charging current drops below 0.075 A, the charger task enters

Normal Charge mode. It also sets the remaining capacity to 90 % if

current dropping was caused by battery filling up rather than missing

energy at +ExtDC terminal.

During Quick Charge, the remaining capacity can be reliably estimated

only after a certain amount of time. This is when the charging voltage

has reached the limit and the current has started to decrease. At this

point, the remaining capacity is roughly 60 %. Normally, this point

should be reached within two hours if the battery was completely

empty.

Float Charging

When the charger task enters the Float Charge mode, the battery is

considered to be full and the remaining capacity is set to 100 %.

Charging voltage is set to 6.85 V corrected with temperature

coefficient. Current limit is always 100 mA in Float Charge.

If the battery starts to discharge, the charger task enters the Normal

Charge mode.

NOTE

Quick charging is not fully possible for batteries having more than

6 Ah capacity, due to the limited maximum current of the logger’s

charger.

NOTE

If an empty battery (with a voltage less than 5.5 V initially) starts

charging and reaches the 60 % limit very quickly (or does not even

Quick Charge), it is probably damaged and should be replaced to

ensure reliable operation.

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Vaisala WMS302 Betriebsanweisung Seite 228