Powerware 9 - Manual (Page 42)

UPS Operation
36 Powerware ® 9 Prestige Series User’s Guide (600 VA - 1800 VA)
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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 7). While
power is applied to the UPS, the maintenance-free battery is
automatically kept in a fully-charged condition.
UPS Load
Outlets
Battery
Optional Battery Cabinets
Utility
Power
Surge
Suppression
EMI/RFI Filters
Rectifier Inverter
Bypass Line
Battery Battery
Battery
Charger
Figure 7. 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 8).
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
SITE FAULT
OVERTEMP
BATTERY
SELF TEST
Figure 8. Normal Operation Indicators