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7 – Operating Modes
This section provides a basic description of the UPS system's operating modes. For more information about switching between operating modes,
refer to
Section 8 – Start-Up, Shutdown and
7-1 Online (Normal) Mode (Single UPS)
In online (normal) mode, the UPS system's rectifier converts incoming
AC utility power to DC power that charges the batteries and supplies the
inverter. The inverter transforms the DC power to precision-regulated,
pure sine wave AC power that supports the operation of connected
equipment. This dual conversion technology isolates connected
equipment from all power problems and ensures that connected
equipment receives ideal power at all times.
7-2 Battery Backup Mode (Single UPS)
When a blackout or other extreme power event occurs, the UPS system
automatically switches from normal mode to battery backup mode. The
UPS system's batteries (internal and/or external) provide emergency
DC power to the inverter. The inverter transforms the DC power
to precision-regulated, pure sine wave AC power that supports the
operation of connected equipment.
7-3 Auto Bypass Mode (Single UPS)
If the inverter malfunctions due to excessive temperature, overload,
output short circuit, abnormal voltage or battery problems, the inverter
will shut down. If the UPS system detects a bypass power source that
conforms to normal parameters, then the UPS system automatically
switches to auto bypass mode to continue supplying power to connected
equipment. When all problems are eliminated, the UPS system switches
back to online (normal) mode automatically.
7-4 Manual Bypass Mode (Single UPS)
If UPS system maintenance or repair is required, you can bypass the
UPS system and enable bypass power manually. After confirming that
bypass power is present, switch the UPS system into manual bypass
mode. This allows service technicians to perform maintenance or repair
jobs without interrupting the flow of AC power to connected equipment.
Warning: The UPS system must be de-energized completely before
performing maintenance or repair by shutting it down completely
after switching it to manual bypass mode.
200803004 93-2793 SU80k manual 4C.indd E17
200803004 93-2793 SU80k manual 4C.indd E17
All manuals and user guides at all-guides.com
Bypass.
CB3
CB2
CB1
XFMR
MAIN
CB3
CB2
CB1
XFMR
MAIN
CB3
CB2
CB1
XFMR
MAIN
CB3
CB2
CB1
XFMR
MAIN
17
CB4
LOAD
XFMR
STS
CB5
CB4
LOAD
XFMR
STS
CB5
CB4
LOAD
XFMR
STS
CB5
CB4
LOAD
XFMR
STS
CB5
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6/16/2008 1:43:27 PM
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