Toshiba T42F3F500XAMBN User Manual - Page 42
Battery Recharging, Rated Battery Voltages, V float, V min, I charge
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TOSHIBA 6.7 Battery Recharging The illustration below shows a graphical representation of the UPS battery recharge process after a full discharge. The recharge process usually consists of three steps. During the first step, the charging current is maintained at approximately 4.0 amperes for the 15/25/30 kVA with internal batteries, 10.0 amperes for the 15/25/30 kVA with internal transformer and approximately 11.5 amperes for all 50 kVA models. This current is the maximum value that can be used to charge the batteries (for minimal recharge time) while assuring safety and long battery life. In the second step, constant-voltage control starts and current gradually decreases as the batteries charge to their normal fully charged state. In the third step, a slight "trickle" current continues to flow into the batteries to keep them fully charged and "floating" at the normal DC Voltage level. A full recharge usually requires approximately 24-72 hours (90% recharge in 10 X discharge time) after a complete discharge. The following chart shows the rated maximum and minimum battery voltages, and the charge current for each of the sizes while the unit is maintained in a 75 °F (24 °C) ambient. Model V float V min I charge Rated Battery Voltages 15/25/30 kVA 50kVA Internal Internal Internal Internal Battery Transformer Battery Transformer 324.0 VDC 324 VDC 324 VDC 216 VDC 216 VDC 216 VDC 4.0 A 10.0 A 11.5 Amps 4200FA CT/XT User's Manual 41