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Depending on overload conditions, the UPS remains in Bypass mode for at least 5
seconds and will stay in this mode if three transfers to Bypass occur within 20
minutes.
The UPS transfers to Bypass mode when:
v the user activates Bypass mode through the front panel
v the UPS detects an internal failure
v the UPS has an overtemperature condition
v 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 (
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.
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.
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Installation and User's Guide
indicator). Depending if Bypass Standby setting is enabled, the
Table 3. 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
AC source
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
normal
n/a
Bypass
Standby
powered
no power
charging
charging
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
no
bypass
normal
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