1
5
8
3
6
10
2
9
4
7
11
12
13
Q1
Q3
Q4
CB5
LOAD
MAIN
STS
Q2
XFMR
XFMR
Q1
Q3
Q4
CB5
LOAD
MAIN
STS
Q2
XFMR
XFMR
Q1
Q3
Q4
CB5
LOAD
MAIN
STS
Q2
XFMR
XFMR
Q1
Q3
Q4
CB5
LOAD
MAIN
STS
Q2
XFMR
XFMR
17
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 Bypass
.
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, stop the inverter by pressing the OFF button
and answering “YES” to the question “Transfer to Bypass Mode?” (this
transfers the UPS to static bypass) then switch the UPS system into
manual bypass mode. (See
Section 8-5
for complete manual bypass
procedure.) 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.
