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4400 Series Installation and Operation Manual – 64527-008
13.4 Battery Low Voltage Tolerances
The battery charging period varies depending on the amount of discharge during backup. Figure 13.2 shows the typical
recharge curve for a fully discharged battery.
Charging Period
Explanation
Period 1
Initial charging at maximum current (limited by charger). V
min
is
minimum voltage at which the UPS will shut down power to the
load.
Period 2
Charging rate drops as battery voltage increases.
Period 3
Battery cells are at maximum voltage, UPS continues to provide a
“trickle charge” to keep the batteries a maximum charge capacity.
BATTERY
CHARGE
VOLTAGE
CURRENT VOLTAGE
CHARGING
CURRENT
I
CHARGE
(11.5A)
V
MAX
= 324 V
V
MIN
= 230 V
DISCHARGE
SHUT-OFF
POINT
PERIOD 1 PERIOD 2 PERIOD 3
TIME
FULLY
CHARGED
0 0
FIGURE 13.2: TYPICAL BATTERY CHARGING CURVE
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