Battery Recharging - Toshiba 1500 Plus Series Operation Manual

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.
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.
600 VA
800 VA
1000 VA
5 - 5
Battery
charge
voltage
Time
Period 2
Vmin.
68.2 48.0
68.2 48.0
68.2 48.0
Fully
charged
Period 3
Charge
0.4 (A)
0.4 (A)
0.4 (A)