AIMS Power
www.aimscorp.net
2.5.2 AC Charger
The Global LF Series inverter charger is equipped with an active PFC (Power Factor Corrected) multistage
battery charger. The PFC feature is used to control the amount of power used to charge the batteries in
order to obtain a power factor as close as possible to 1.
Unlike other inverters whose max charging current
decreases according to the input AC voltage, the Global LF series inverter charger is able to output max
current as long as the input AC voltage is in the range of 164-243VAC(95-127VAC for 120V model), and
AC frequency is in the range of 48-54Hz(58- 64Hz for 60Hz model).
The Global LF series inverter charger has a very rapid charge current available, and the max charge current
can be adjusted from 0%-100% via a liner switch to the right of the battery type selector. This will be
helpful if you are using our powerful charger on a small capacity battery bank. Fortunately, the liner switch
can effectively reduce the max charging current to 20% of its peak.
Choosing “0” in the battery type selector will disable the charging function.
Caution:
Turn the charge current control switch gently to avoid breakage due to over-turning.
Not covered
under warranty.
There are 3 charging stages:
Bulk Charging: (fast charge LED solid)
this is the initial stage of charging. While Bulk Charging, the
charger supplies the battery
with controlled constant current. The charger will remain in Bulk charge until
the Absorption charge voltage (determined by the Battery Type selection) is achieved.
A software timer will measure the time from A/C start until the battery charger reaches 0.3V below the
boost voltage, then take this time asT0 and T0×10 = T1.
Absorb Charging: (fast charge LED blinking)
This is the second charging stage when the fast charge LED
is flashing and begins after the absorb voltage has been reached.
Absorb Charging provides the batteries
with a constant voltage and reduces the DC charging current in order to maintain the absorb voltage setting.
In this period, the inverter will start a T1 timer; the charger will keep the boost voltage in Boost CV
mode until the T1 timer has run out. Then drop the voltage down to the float voltage. The timer has a
minimum time of 1 hour and a maximum time of 12 hours.
Float Charging: (float charge LED solid)
The third charging stage occurs at the end of the Absorb
Charging time. While Float
charging, the charge voltage is reduced to the float charge voltage
(determined by the Battery Type selection*). In this stage, the batteries are kept fully charged and ready if
needed by the inverter.
If the AC is reconnected or the battery voltage drops below 12Vdc/24Vdc, the charger will restart the above
cycle.
If the charge maintains the float state for 10 days, the charger will deliberately reset the cycle to protect the
battery.
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