Liebert UPSTATION GXT 2U - Manual (Page 20)

16
OPERATING INSTRUCTIONS
N
ORMAL
M
ODE
O
PERATION
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 batter-
ies in a fully charged state.
The four green LEDs indicate an approximate level of load in 25% incre-
ments. If the UPS becomes loaded beyond full rating, the fifth (amber)
LED indicator will illuminate and sound an audible alarm. The display
template indicates the percentage of load (50% of load shown in exam-
ple) on the UPS output.
B ATTERY M ODE O PERATION
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 battery runs low
(approximately 2 minutes remaining, but this is user configurable). The AC
Input LED will extinguish, and the Battery LED will illuminate to warn that a
utility problem has occurred. Each load/battery level indicator represents a
20% capacity level. As capacity decreases, fewer indicators remain illumi-
nated. Refer to Troubleshooting section.
For approximate battery run times, refer to Battery Run Times charts in
this manual. To increase this time, turn off non-essential pieces of equip-
ment (such as idle computers and monitors) or add the optional external
battery cabinet.
B
ATTERY
R
ECHARGE
M
ODE
Once utility power is restored, the UPS resumes normal operation. At this
time, the Battery Charger begins recharging the battery.
!
CAUTION
Turning off the UPS while in battery mode will result
in loss of output power.
Normal Mode Operation at 50%
AC INPUT BATTERY UPS ON BYPASS
Battery Mode Operation at 80 - 61%
AC INPUT BATTERY UPS ON BYPASS