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12.9 Battery Recharging
The illustration below shows a graphical representation of the UPS battery recharge process after a full
discharge.
CURRENT
I
CHARGE
0
The recharge process usually consists of three periods.
•
During the first period, the current is maintained at approximately 1.0 ampere. This current limit is the
maximum value that can be used to charge the batteries (for minimal recharge time) while assuring
safety and long battery life.
•
In the second period, constant-voltage control starts and current gradually decreases as the batteries
charge to their normal fully charged state.
•
In the third period, a slight trickle current continues to flow into the batteries to keep them fully charged
and floating at the normal Vdc level.
A full recharge usually requires 24 hours (90% recharge in 4 hours) after a complete discharge.
The following chart shows the rated maximum and minimum battery voltages and the charge current for
the UPS.
34
VOLTAGE
CHARGING
CURRENT
V
MAX
V
MIN
DISCHARGE
SHUT-OFF
POINT
0
PERIOD 1
FIGURE
12-7:
TABLE
12-2:
RATED BATTERY VOLTAGES
Model
Vmax
(Float)
6 kVA
246 V
T1000 Series UPS Installation and Operation Manual – 91074-002
BATTERY
CHARGE
VOLTAGE
PERIOD 2
BATTERY RECHARGING PROFILE
Vmin
Icharge
170 V
1.0 A
FULLY
CHARGED
TIME
PERIOD 3
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