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Battery Low Voltage Tolerances - Toshiba 4400 Series Installation And Operation Manual

Three phase - 15/20/25/30/50/80/100 kva
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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
Period 1
Period 2
Period 3
I
CHARGE
(11.5A)
100
Initial charging at maximum current (limited by charger). V
minimum voltage at which the UPS will shut down power to the
load.
Charging rate drops as battery voltage increases.
Battery cells are at maximum voltage, UPS continues to provide a
"trickle charge" to keep the batteries a maximum charge capacity.
CURRENT
VOLTAGE
V
= 324 V
MAX
V
= 230 V
MIN
DISCHARGE
SHUT-OFF
POINT
0
0
PERIOD 1
FIGURE 13.2: TYPICAL BATTERY CHARGING CURVE
Explanation
CHARGING
BATTERY
CURRENT
CHARGE
VOLTAGE
PERIOD 2
4400 Series Installation and Operation Manual – 64527-008
is
min
FULLY
CHARGED
TIME
PERIOD 3

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