4. Operation
14).
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.
The UPS may at times silently implement a High Alert mode, usually when incoming utility conditions
are unfavorable. In High Alert mode, the UPS disables the battery support test to ensure maximum
capacity from the batteries if needed. The UPS will remain in High Alert for 24 hours or until changed
by a Power Strategy command before returning to its previous mode.
Optional High Efficiency and Energy Saving settings minimize heat contribution to the rack
environment. See "User Settings" on page 15.
Battery Mode
When the UPS is operating during a power outage, the alarm beeps once every five seconds and the
indicator illuminates solid.
When the utility power returns, the UPS transfers to Normal mode operation while the battery
recharges.
If battery capacity becomes low while in Battery mode, the
indicator flashes slowly and the audible
alarm beeps once every second. If the "Battery Low" alarm is set, the indicator also illuminates
solid. This warning is approximate, and the actual time to shutdown may vary significantly.
Depending on the UPS load and the number of Extended Battery Modules (EBMs) connected,
the "Battery Low" warning may occur before the batteries reach 25 % capacity. See table 23 on
page 33 for estimated runtimes.
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.
The UPS remains in Bypass mode for at least 5 seconds (if the bypass source remains acceptable). If
three transfers to Bypass occur within 10 minutes for any reason other than user command, the UPS
locks in Bypass for 1 hour or until any control button is pressed.
The UPS transfers to Bypass mode when:
the user activates Bypass mode through the front panel. l
the UPS detects an internal failure. l
the UPS has an overtemperature condition. l
the UPS has an overload condition listed in table 20 on page 32. l
The UPS shuts down after a specified delay for overload conditions listed in table 20 on page 32.
The UPS remains on to alarm the fault
Standby Mode
When the UPS is turned off and remains plugged into a power outlet, the UPS is in Standby mode.
The indicator is off, indicating that power is not available to your equipment. The battery recharges
when necessary, and the communication bay is powered.
If utility fails and output turns off due to drained batteries or UPS internal failure, the UPS alarms in
Standby mode and powers the communication bay for 1 hour 30 minutes or until battery voltage drops
below 1.75 volts per cell (whichever occurs first).
If utility fails while the UPS is in Standby mode, the logic power supply turns off in approximately
10 seconds.
If the UPS is waiting on commands and utility fails, unit and logic power turn off in approximately
30 seconds.
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