APC BK600EI - Manual (Page 21)

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sound a loud tone 2 minutes in advance of shut down due to battery capacity exhaustion.
Once shut down, the UPS will return to the periodic beep. The UPS should be turned off
at this point to cease the alarm. In the event the UPS encounters a severe overload, the UPS
will shut down and emit a loud tone. The alarm is reset when the UPS is turned off.
5.4 Option Switches
The option switches are located on the rear panel and are set
to the down (off) position as supplied from the factory.
5.4.1 Option Switch #1
When option switch #1 is set to the up (on) position in advance of a utility failure, the
UPS’s audible utility failure alarm is defeated. When the switch is set to the down position
(this is the factory setting), the UPS beeps once every five seconds when the utility voltage
has fallen outside acceptable limits. Regardless of the position of this control, the UPS will
still sound a loud tone during the low battery conditions. This feature is convenient where
brief power interruptions are common and the audible alarm becomes an annoyance.
5.4.2 Option Switch #2 and #3
Option switches #2 and #3 adjust the utility voltage at which the UPS will transfer your
computer equipment to the UPS’s alternate power source. Adjustment of the “transfer
voltage” is desirable where frequent line voltage excursions or line voltage distortion
cause the UPS to transfer many times a day. The switches may be set according to the
following charts if it is known that your equipment will operate normally under such line
voltage conditions. Normally, the switches should be left in the down position (this is the
factory setting).