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TOSHIBA
5.0
Operating the UPS (Cont'd)
5.7
Battery Recharging
The graph below shows the typical voltage requirements for recharging the UPS unit's
batteries.
Current
0.4 amp (A)
0
The recharge process usually consists of three periods. During the first period, the
current is maintained at approximately 0.4 amperes. In the second period, the constant-
voltage control starts and the current gradually decreases as the batteries continue to
charge. In the third period, a slight current flows into the batteries to keep them fully
charged. After a complete discharge, a full recharge usually requires 24 hours (90%
recharge in 8 hours).
The chart depicted below shows the rated maximum and minimum battery voltages,
and the charge current for each of the sizes.
Voltage
Charging
current
Vmax.
Discharge
Vmin.
shut-off point
0
Period 1
Rated battery voltages
Model
Vmax.
2000 VA
110.4
2400 VA
110.4
5 - 6
Battery
charge
voltage
Time
Period 2
Vmin.
Charge
76.8
0.4 (A)
76.8
0.4 (A)
Fully
charged
Period 3
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