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12.7 Battery Backup Time and Discharge Process
The UPS battery module will provide approximately 5 minutes of back-up time per battery module when
operating at full load at the rated power factor. The exact length of these times will depend on the condition
of the batteries, amount and type of load, temperature and other variables. See battery backup time in
"Appendix A: T1000 Specifications" on page A-3.
The following illustration graphically shows the battery discharge process at full load conditions.
CURRENT
I
MAX
I
MIN
12.8 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 when loaded to rated full load at 240V and at what
level the low-voltage condition will cause the unit to automatically shut down.
UPS Capacity
Nominal voltage (V
Alarm voltage (V
Shutdown voltage (V
T1000 Series UPS Installation and Operation Manual – 91074-002
VOLTAGE
V
NOM
V
LOW
V
MIN
100% ... ←
BATT. CAPCITY
FIGURE
12-6:
BATTERY DISCHARGE CURVES
TABLE 12-1: VOLTAGE TOLERANCES
)
NOM
)
LOW
)
MIN
SHUTDOWN
→ ...10%
0%
6 kVA
216 Vdc
194 Vdc
170 Vdc
33
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