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88 4200FA Installation and Operation Manual
The EPO function is initiated by pressing and briefly holding the red EPO switch in the depressed
(shutdown) position. The effect of using the EPO switch is the same whether the UPS is in the AC Input
Mode, Battery Backup Mode, or the Bypass Mode. (See 'EMERGENCY OFF' screen.)
The following figure shows the UPS condition after application of the EPO switch.
Use the Start-up Procedure for restarting the unit.
Audible Alarm Functions 10.5
The UPS is equipped with an audible alarm that will beep when the UPS is in the battery backup mode,
has a fault, has low battery voltage, or is in an overload condition. The audible alarm will also beep each
time an effective item is touched on the touchscreen. The following chart shows the alarm pattern and
durations for each condition. Time units are shown in seconds.
Table 10.1 AUDIBLE ALARMS
Condition
Audible Pattern
Any Fault (Intermittent buzz until fault clears)
Switch to Backup (Single five-second buzz)
Backup Operation (Intermittent buzz once
every ten seconds)
UPS Battery Shutdown Voltage
(Batt. Voltage 79% Normal)
Warnings:
OL110 (Overload Timer)
LB (Low Battery - Batt. Voltage 90% Normal)
BLFN (Battery Life Pre-alarm - Batt expires in 6
mo.)
BLFE (Battery Life End)
CHRGOV (Charger Over Voltage)
BTSTFL (Battery Test Fail)
BOH (Battery Overheat)
AOH (Ambient Overheat)
CLMT (Current Limit)
DCER (Display Disconnected)
BDEPL (Battery Depletion)
Touching Effective Item on Touchscreen
The audible alarm can be silenced most easily by pressing the Buzzer Silent button on the Quick Access
Toolbar.
Alternatively, the audible alarm can also be silenced by selecting the Settings tab, and then set the
Buzzer Silent parameter to “Disable.”
This will turn off the audible alarm for the current alarm status, but the audible alarm will still sound when
the next Fault/Warning condition occurs.