TOSHIBA
Model Vmax. Vmin. Charge (A)
2.4 kVA 109.2 77 0.4
3.6 kVA 163.8 115 0.4
6 kVA 245.7 175 0.4
8 kVA 286.7 201 0.4
6.0 Operating the UPS (Cont'd)
6.8 Battery Recharging
The illustration below shows a graphical representation of the UPS battery recharge
process after a full discharge.
6 - 4
Period 1
Period 2 Period 3
current
Battery
charge
voltage
Fully
charged
Charging
0.4 amp (A)
0
0
Discharge
shut-off point
Vmax.
Vmin.
Time
Voltage
Current
The recharge process usually consists of three periods. During the first period, the
current is maintained at approximately 0.4 amperes. 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 10 hours) after a complete discharge.
The following chart shows the rated maximum and minimum battery voltages, and the
charge current for each of the sizes.
Rated Battery Voltages
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