Lucent Technologies Uninterruptible Power Systems 3000 VA - Manual (Page 48)

UPS Operation 4
Lucent Technologies Model 3000 UPS Operator's Manual (167Ć405Ć119 Issue 3) 38
Operating Modes
After you install and apply power to the UPS, the UPS filters and regulates incoming
AC power, eliminating noise and voltage spikes, and provides consistent power to
your equipment (see Figure 14). While power is applied to the UPS, the
maintenanceĆfree battery is automatically kept in a fullyĆcharged condition.
Rectifier
Battery
Circuit
Breaker
Battery Module Optional
Battery Module Optional
Battery Module/
EBC
Battery
Charger
Input Plug
EMI/RFI
Filter
Input
Circuit
Breaker
Inverter
Bypass
Load
Relay
UPS
Load
AC Input
to BDM
BDM
UPS Load
Figure 14. UPS Block Diagram
Normal Mode
During Normal Mode, the

Indicator illuminates and the front panel displays the
percentage of UPS load capacity being used by the protected equipment
(see Figure 15).
LOAD OFF LOAD ON LOAD ON LOAD ON LOAD ON
APPROX.
81-100%
LOAD
APPROX.
61-80%
LOAD
APPROX.
41-60%
LOAD
APPROX.
0-40%
LOAD
NORMAL
UTILITY
OVERLOAD
I1
I2
I3
OUTPUT ON
Figure 15. Normal Operation Indicators