Section III
Operation
006-0006205
UPS-1500 Series
Rev ZC
30 of 60
05/28/2019
Audible alarm
For critical situations a pattern of audible tones will be repeated every 5 seconds, according to the
table below. This audible alarm can be silenced by holding the ON/OFF switch on the front panel
in the “UP” position until a chirp is heard. A new alarm condition will cause the audible alarm to
be reactivated. Contact Factory for instructions on how to permanently silence the alarm.
Number of Tones in Pattern
Indication
One
UPS is Drawing Power From the Battery Pack
Two
Load Power is greater than or approaching 100%
Rated Power
Three
Fault Appears on the AC Output
UPS Must be Turned Off and Back On to Reset Fault
Four
UPS is Drawing Power From the Battery Pack and the
Remaining Charge is <10%
Hot Swapping the Battery Pack
The battery pack can be removed from the UPS and it, or another one, can be inserted into the
UPS without disrupting the delivery of power to the load as long as a source of input power is
available. This feature is referred to as “hot swapping” in the industry. It can be used to replace
a battery pack that needs servicing, or to replace a drained battery pack with a spare, fully
charged one if additional back-up protection must be ensured before the drained battery pack
will have time to be recharged.
Of course, if there is no source of input power available and the UPS is therefore drawing power
from the battery, then the removal of the battery pack would cause the UPS’s outputs to shut
down until a recharged battery pack is inserted.
