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8 – 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 9 – Start-Up, Shutdown and Bypass.
8-1 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.
8-2 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.
8-3 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 (reserve) 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.
8-4 Manual Bypass Mode (Single UPS)
If UPS system maintenance or repair is required, you can bypass
the UPS system and enable bypass (reserve) 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 9-5 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.