Battery Recharge - Toshiba 5000 Series Installation And Operation Manual

13.7

Battery Recharge

The battery charging period varies depending on the amount of discharge during backup.
Charging Period
Period 1
Period 2
Period 3
I
CHARGE
(30A)
5000 Series 3P1 Industrial UPS Installation and Operation Manual – 92973-001
Initial charging at maximum current (limited by charger). V
voltage at which the UPS will shut down power to the load.
Charging rate drops as battery voltage increases.
Battery cells are at maximum voltage, UPS continues to provide a "trickle
charge" to keep the batteries a maximum charge capacity.
CURRENT VOLTAGE
V = 135 V
MAX
V = 105 V
MIN
DISCHARGE
SHUT-OFF
POINT
0 0
PERIOD 1
FIGURE 13.2:
Explanation
CHARGING
CURRENT
PERIOD 2
TYPICAL BATTERY CHARGING CURVE
is minimum
min
BATTERY
CHARGE
VOLTAGE
FULLY
CHARGED
TIME
PERIOD 3
67