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UPS Operation 4
Lucent Technologies Model 3000 UPS Operator's Manual (167Ć405Ć119 Issue 3)
39
Bypass Mode
The
Indicator and the Indicator illuminate simultaneously, indicating
Bypass Mode (see Figure 16). When the UPS is in Bypass Mode, the load is powered
by utility power. However, utility power continues to be passively filtered by
the UPS.
LOAD ON
UNIT ON
BYPASS
OVERLOAD
I1
I2
I3
OUTPUT ON
Figure 16. Bypass Operation Indicators
Battery Mode
When the UPS is operating during a power outage, the alarm beeps several times
initially, and then once every 10 seconds while in Battery Mode. The
Indicator
illuminates. The front panel displays the approximate percentage of battery capacity
remaining (see Figure 17). When the utility power returns, the UPS switches to
Normal Mode operation while the battery recharges.
BATTERY
ONLINE
>75%
CAPACITY
REMAINS
BATTERY
ONLINE
>50%
CAPACITY
REMAINS
BATTERY
ONLINE
>25%
CAPACITY
REMAINS
BATTERY
ONLINE
BATTERY
ONLINE
SHUTDOWN
IMMINENT
LOW
BATTERY
WARNING
OVERLOAD
I1
I2
I3
OUTPUT ON
Figure 17. Battery Operation Indicators
If battery capacity becomes low while in Battery Mode, the I3 Indicator begins to
flash and the Output On Indicator remains lit, indicating approximately two
minutes before UPS shutdown. The alarm beeps every two seconds.
When shutdown is imminent, the Output On Indicator flashes. These warnings are
approximate, and the actual time to shutdown may vary significantly. Once these
warnings are indicated, immediately complete and save your work to prevent data
loss and similar difficulties. When utility power is restored after the UPS shuts
down, the UPS automatically connects to the load when the startup is complete.