Battery Recharging - Toshiba 1400 Series Operation Manual

5.0 Operating the UPS (Cont'd)
5.5

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) for the 500 through 750 VA models and 30 hours (90% recharge in
8 hours) for the 800 through 2000 VA models.
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.
600 VA 41.4
800 VA 55.2
1000 VA 69.0
1200 VA 82.8
1500 VA 82.8
2000 VA 110.4
500 VA Plus 41.4
750 VA Plus 55.2
1000 VA Plus 69.0
1500 VA Plus 82.8
Battery
charge
voltage
Time
Period 2
Vmin. Charge
29.2 0.4 (A)
38.9 0.4 (A)
98.6 0.4 (A)
58.3 0.4 (A)
58.3 0.4 (A)
77.8 0.4 (A)
29.2 0.4 (A)
38.9 0.4 (A)
48.6 0.4 (A)
58.3 0.4 (A)
5 - 6
TOSHIBA
Fully
charged
Period 3