Liebert PSITM - Manual (Page 22)

Modes of Operation
18
7.3 Battery Mode
The UPS switches to Battery mode in the event of an extreme input voltage/frequency condition or
complete mains failure. The battery system supplies power through the Inverter (1000VA & 1440VA)
or through the DC-to-DC converter to the Bi-Directional Converter (2200VA & 3000VA) to generate
power for the connected equipment.
When the UPS is in Battery mode, the Battery Indicator illuminates green and an alarm sounds
every 10 seconds. As capacity decreases, fewer indicators remain illuminated. Figure 15 shows the
UPS in Battery mode with 61% - 80% battery capacity remaining.
Figure 15 Battery mode at 61 – 80% battery capacity
When a low battery condition occurs, the Battery Indicator flashes green and the alarm sounds every
half-second. The default low battery warning is two (2) minutes but can be configured via MultiLink.
For more information, refer to 11.0 - Troubleshooting.
Figure 16 Low Battery mode
For approximate battery run times, refer to Table 5 - Battery run times. These run times are
approximates based on resistive load and an ambient temperature of 25°C (77°F). To increase this
time, turn Off non-essential pieces of equipment, such as idle computers and monitors, or add exter-
nal battery cabinets.
7.4 Battery Recharge Operation
Once mains power is restored, the UPS resumes normal operation. At this time, the Battery Charger
begins recharging.
!
CAUTION
Turning Off the UPS while it is in battery mode will result in loss of output power.
Battery Indicator
illuminated
Battery Indicator
flashes green