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5. Operation
5.2 Operating modes
The Eaton 9PX front panel indicates the UPS status through the UPS indicators, see page 14.
Online mode
During Online mode, the
indicator illuminates solid and the UPS is powered from the utility.
The UPS monitors and charges the batteries as needed and provides filtered power protection to your
equipment. Optional High Efficiency and Energy Saving settings minimize heat contribution to the rack
environment. See user settings on page 14.
Battery mode
When the UPS is operating during a power outage, the alarm beeps once every ten seconds and the
indicator illuminates solid. The necessary energy is provided by the battery.
When the utility power returns, the UPS transfers to Online mode operation while the battery recharges.
If battery capacity becomes low while in Battery mode, the audible alarm beeps once every 3 seconds.
This warning is approximate, and the actual time to shutdown may vary significantly.
Shutdown all applications on the connected equipment because automatic UPS shutdown is imminent.
When utility power is restored after the UPS shuts down, the UPS automatically restarts.
Bypass mode
In the event of a UPS overload or internal failure, the UPS transfers your equipment to utility power.
Battery mode is not available and your equipment is not protected; however, the utility power continues
to be passively filtered by the UPS. The
indicator illuminates.
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:
• the user activates Bypass mode through the front panel.
• the UPS detects an internal failure.
• the UPS has an overtemperature condition.
• the UPS has an overload condition listed in table 6 on page 42.
The UPS shuts down after a specified delay for overload conditions listed in table 6 on page 42.
The UPS remains on to alarm the fault
Standby mode
When the UPS is turned-off and remains connected to AC source, the UPS is in Standby mode.
Depending if Bypass Standby setting is enabled, the output is powered but not protected.
The battery recharges when necessary and the communication ports are powered.
5.3 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.
Summary of Contents for 9PX3K3U
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