Tripp Lite SU20KX, SU80KX, SU40KX owner manual 1 8 - Operating Modes, Online Normal Mode Single UPS

18 – 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.
2	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
3	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.
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5	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
6	to precision-regulated, pure sine wave AC power that supports the
	operation of connected equipment.
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	8-3 Auto Bypass Mode (Single UPS)
8	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
9	power to connected equipment. When all problems are eliminated, the
	UPS system switches back to online (normal) mode automatically.

108-4 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
11	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 9-5for complete
	manual bypass procedure.) This allows service technicians to perform
12	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.

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