TOSHIBA
23
Operating the UPS
Battery Backup Time and Discharge Process
The UPS batteries provide about 5-7 minutes of back-up time depending on the 1600EP unit
kVA rating. These times are valid when the unit is operating under full load and at the rated
power factor. When these models are operating at half load, the batteries can provide about
15-20 minutes of back-up time. The exact length of these times will depend on the UPS
model used, condition of the batteries, amount and type of load, temperature and other
variables. See battery backup time in 'Standard Specifications' beginning on pages 18-21.
The following illustration graphically shows the battery discharge process at full load conditions.
Battery Low Voltage Tolerances
Excessive discharge will cause the UPS battery voltage to drop. The chart shown below lists the
voltage level at which each UPS low-voltage alarm will sound and also at what level the low-
voltage condition will cause the unit to automatically shut down.
UPS Capacity 3.6kVA 6.0kVA 8.0kVA 10kVA 14kVA 18kVA
Nominal voltage (Vnom)
216Vdc 216Vdc 288Vdc 288Vdc 288Vdc 288Vdc
Alarm voltage (Vlow)
192Vdc 192Vdc 246Vdc 246Vdc 246Vdc 246Vdc
Shutdown voltage (Vmin)
170Vdc 170Vdc 227Vdc 227Vdc 227Vdc 227Vdc
Current
oltage
Vnom
Vlow
Vmin
Imax
Imin
Shutdown
Voltage
100%
20%
0%
Battery Capacity
