TOSHIBA
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5.0 Operating the UPS (Cont'd)
5.6 Battery Recharging
The graph below shows the typical voltage requirements for recharging the UPS unit's
batteries.
Model Vmax. Vmin. Charge
600 VA / 600 VA Plus 68.2 48.0 0.4 (A)
800 VA / 800 VA Plus 68.2 48.0 0.4 (A)
1000 VA / 1000 VA Plus 68.2 48.0 0.4 (A)
1200 VA 68.2 48.0 0.4 (A)
Rated battery voltages
Period 1
Period 2 Period 3
Time
Current
Voltage
Vmax.
Vmin.
Battery
charge
voltage
Fully
charged
Discharge
shut-off point
Charging
current
0.4 amp (A)
0
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.
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