Battery Recharging - Toshiba 1600EP SERIES Instruction Manual

Battery Recharging

The illustration below shows a graphical representation of the UPS battery recharge process after a full
discharge.
CURRENT
Icharge
ICHARGE
The recharge process usually consists of three periods. During the fi rst period, the current is maintained
at approximately 1 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 fl ow into the batteries to keep
them fully charged and "fl oating" at the normal Vdc level. A full recharge usually requires 24 hours (90%
recharge in 12 hours) after a complete discharge.
The following chart shows the rated maximum and minimum battery voltages and the charge current for
each of the sizes.
28
VOLTAGE
CURRENT
Charging
CHARGING
Current
VMAX
Vmax
Vmin
VMIN
Discharge
DISCHARGE
SHUT-OFF
Shut-off Point
POINT
Period 1
PERIOD 1
RATED BATTERY VOLTAGES
Model Vmax
3.6kVA 245.7
6kVA 245.7
8kVA 327
10kVA 327
14kVA 327
18kVA 327
22kVA 327
BATTERY
Battery
CHARGE
Charge
VOLTAGE
V lt
Period 2
Period 3
PERIOD 2
Vmin Icharge
170 1.0 amp
170 1.0 amp
227 1.0 amp
227 1.0 amp
227 1.0 amp
227 1.0 amp
227 1.0 amp
1600EP Series Instruction Manual
Time
TIME
PERIOD 3