1.
Power On Switch
To turn the UPS on, press the power button
for approximately 2 seconds - you will hear
a constant tone (1 second) - and release
after a short beep.
To turn the UPS off, press the power button
for approximately 2 seconds - you will hear
a constant tone (1 second) - and release
after two short beeps.
Alarm setting: The audible alarm can be
turned OFF or ON by quickly pressing the
POWER button twice. The default setting
is for the Alarm On. To turn the Alarm Off,
quickly press the power button twice. You
will hear two short beeps when the Alarm
is turned off. To turn the Alarm back ON,
quickly press the power button twice. You
will hear a single short beep when the
Alarm is turned on.
*When the Alarm is turned off, there will
be no audible notification when the UPS
reaches a low battery state.
2.
Power On Indicator (green)
This LED is illuminated when the utility
power is normal and the UPS outlets are
providing power, free of surges and spikes.
3.
Battery and Surge Protected Outlets
The unit has several battery powered and
surge protected outlets to ensure tem-
porary uninterrupted operation of your
equipment during a power failure.
(DO
NOT plug a laser printer, paper shredder,
copier, space heater, vacuum cleaner, sump
pump, or other large electrical device into
the “Battery and Surge Protected Outlets.”
The power demands of these devices will
overload and possibly damage the unit.)
4.
Full-Time Surge Protection Outlets
The unit has several surge suppression
outlets.
5.
Circuit Breaker
Located on the side of the UPS, the circuit
breaker serves to provide overload and
fault protection.
6.
USB Port to PC (except for ST425)
The port allows connection and communi-
cation between the USB port on the com-
puter and the UPS unit. The UPS communi-
cates its status to the PowerPanel® Personal
software.
7.
USB Charging ports (except for ST425)
The USB charging ports provide 5V 2.1A
power output.
8.
Widely-Spaced Outlets
The UPS unit has four widely-spaced out-
lets, so AC power adapters can be plugged
into the UPS without overlapping or block-
ing adjacent outlets.
BASIC OPERATION
SYSTEM FUNCTION BLOCK DIAGRAM
Input
Output
Battery Mode
Normal Mode
EMI
Filter
Surge
Suppressor
Inverter
Charger
AC / DC
Battery