T1X06000GA-N1-R3 datasheet(44/118 Pages) TOSHIBA

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T1000 Series UPS 5.6-6kVA Installation and Operation Manual – 91074-005

12.9 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 periods.

• During the first period, the current is maintained at approximately 1.0 ampere. This current limit 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 period, constant-voltage control starts and current gradually decreases as the batteries

charge to their normal fully charged state.

• In the third period, a slight trickle current continues to flow into the batteries to keep them fully charged

and floating at the normal Vdc level.

A full recharge usually requires 24 hours (90% recharge in 4 hours) after a complete discharge.

The following chart shows the rated maximum and minimum battery voltages and the charge current for

the UPS.

TABLE 12-2: RATED BATTERY VOLTAGES

Model

Vmax

(Float)

Vmin

Icharge

6 kVA

246 V

170 V

1.0 A

BATTERY

CHARGE

VOLTAGE

CURRENT

VOLTAGE

CHARGING

CURRENT

CHARGE

MAX

MIN

DISCHARGE

SHUT-OFF

POINT

PERIOD 1

PERIOD 2

PERIOD 3

TIME

FULLY

CHARGED

FIGURE 12-7: BATTERY RECHARGING PROFILE

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