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• the UPS has an overtemperature condition
• the UPS has an overload condition listed in the Specifications section
Note: The UPS stops operating after a specified delay for overload conditions listed in the Specifications
section. However, the UPS remains on to alarm the fault.
Standby mode
When the UPS is turned off and remains connected to the AC source, the UPS is in Standby mode (
indicator). Depending if Bypass Standby setting is enabled, the output is powered but not protected. The
battery packs recharge when necessary and the communication ports are powered.
Operating modes: summary
The following table summarizes the characteristics of your UPS unit in each operating mode.
Table 1. Operating modes
Mode
Load
Batteries
Protection features:
Power failure
Power sag
Power surge
Under voltage
Over voltage
Line noise
Frequency variation
Switching transients
Harmonic distortion
Other features:
Frequency conversion
Note: In High Efficiency mode, the UPS is in Bypass mode and transfers to Battery mode in less than 10
microseconds (ms) when utility power fails. Transfers to High Efficiency (HE) mode will be active after
5 minutes of Bypass voltage monitoring: if Bypass quality is not in tolerance, then the UPS will remain
in Online mode.
Transferring the UPS between modes
From Online or Battery to Bypass mode. Press any button to activate the menu options, then select
Control and Go to Bypass.
From Bypass to Online or Battery mode. Press any button to activate the menu options, then select
Control and Go back normal.
Online
Battery
powered
powered
charging
discharging
yes
n/a
yes
n/a
yes
n/a
yes
n/a
yes
n/a
yes
n/a
yes
n/a
yes
n/a
yes
n/a
yes
n/a
Bypass
Standby
no power
powered
charging
charging
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
.
Chapter 5
Operation
27
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