Toshiba 4200FA CT/XT Battery Recharging, Rated Battery Voltages, V float, V min, I charge

TOSHIBA

6.7Battery 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

11.5amperes 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.

	Rated Battery Voltages
Model	15/25/30 kVA			50kVA
	Internal	Internal	Internal		Internal
	Battery	Transformer	Battery		Transformer
V float	324.0 VDC	324 VDC		324	VDC
V min	216 VDC	216 VDC		216 VDC
I charge	4.0 A	10.0 A	11.5 Amps

4200FA CT/XT User’s Manual 41