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