1
7
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 batteries in a
fully charged state.
The four green LEDs indicate an approximate level of load in 25%
increments. 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
example) 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
illuminated. 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
equipment (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
Summary of Contents for S4K2U Series
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