Liebert GXT2-6000 RT208 - Manual (Page 36)

Modes of Operation
30
10.0 M
ODES OF
O
PERATION
10.1 Normal Mode Operation
During normal operation, utility power provides energy to
the UPS. The filters, power factor correction circuit and the
inverter process this power to provide computer grade
power to connected loads. The UPS maintains the batteries
in a fully charged state. The four green Load Level indica-
tors display an approximate level of load in 25% increments.
If the UPS becomes loaded beyond full rating, the fifth
(amber) indicator will illuminate and the UPS will sound an
audible alarm. The display template indicates the percent-
age of load (see example at right) on the UPS output.
10.2 Battery Mode Operation
Battery mode occurs in event of an extreme input voltage
condition or complete utility failure. The battery system
supplies power through the DC to DC converter to the
inverter to generate power for the connected load. During
battery mode an alarm sounds every 10 seconds. This will
change to two beeps every 5 seconds when the battery runs
low (approximately 2 minutes remaining, but this is user
configurable). The AC Input indicator will extinguish and
the Battery indicator will illuminate to warn that a utility
problem has occurred. Each Battery Level indicator repre-
sents a 20% capacity level. As capacity decreases, fewer
indicators remain illuminated. Refer to 13.0 - Trouble-
shooting. For approximate battery run times, refer to
Table 7 - Battery run times. These times are approximate
based on resistive load and an ambient temperature of 77°F (25°C). To increase this time, turn off
non-essential pieces of equipment (such as idle computers and monitors) or add the optional external
battery cabinet.
10.3 Battery Recharge Operation
Once utility power is restored, the UPS resumes normal operation. At this time, the Battery Charger
begins recharging.
!
CAUTION
Turning OFF the UPS while in battery mode will result in loss of output power.
Normal Mode Operation
Batteries at 100% charge
L1 Load at 10%, L2 Load at 90%
Battery Mode Operation
Batteries at 30% charge
L1 Load at 60%, L2 Load at 60%