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Liebert Static Transfer Switch2
™
The Liebert Static Transfer Switch2 (STS 2) provides an
automatic, seamless transfer between the outputs of
two independent UPS systems and the input of a critical
load in a dual-bus power system. If the primary UPS
should fail, the switch will automatically transfer the
loads to the surviving UPS. For redundancy, the Liebert
STS2 features three separate, self-correcting logic
modules. Each controller is capable of working
independently and each helps monitor the other two.
Available in capacities ranging from 100 up to
1000 amps.
True Front-Access Design
All mechanical and electronic components of the
Liebert STS2 are accessible from the front of the unit.
This gives you several immediate benefits:
Greater freedom in system design. The Liebert STS2
can be placed adjacent to or in back of other
equipment. It can also be placed against
a wall or partition.
Simplified installation, with ample space for cable
connections through top and bottom access plates
Less floor space required for maintenance access.
Simplified maintenance, with all key components
visible, serviceable and removable from the front
of the unit, without the need to shut down the
connected load.
Other Features Of The Liebert
Static Transfer Switch2:
Internal CANBUS protocol provides high-bandwidth
communication between system components
via twisted-pair cables. Options can be added
as simple network nodes
Internal dual-bus control power
Sim
plified installation and maintenance
Full range of communications options to fit
any monitoring strategy
Thr
ee-pole switch configurations
True Internal Redundancy
The Li
e
be
r
t STS2 has triple-redundant logic. Each DSP
controller is capable of working independently, and each
helps monitor the other two. If one malfunctions, the
o
the
r t
w
o lock it out. Each controller has power feeds
from both power supplies.
The t
w
o power supplies feature true dual-bus power
d
is
tr
ib
u
ti
on. Both have dual inputs, one from each AC
in
p
u
t s
o
urc
e
. All po
w
e
r connections have diode
p
r
otection, so that internal or external faults cannot
p
r
o
p
a
gate. The result is a rugged, fault-resilient package
th
a
t is o
p
timi
z
ed f
or r
e
al-world applications.
Easy-To-Use Color
Touch-Screen Interface
The controls of the Liebert STS2 are
in
tuitive and simple. The pop-up menus
are easy to understand and provide a
wealth of operational and diagnostic
information.
The color LCD monitor is divided into
three segments. In addition to a system
mimic diagram, there is a status/alarm
panel and a section dedicated to
operator instructions and menus. You
benefit from improved operator
effectiveness, reduced training time,
and less chance of operator error.
The Key To High-Availability Power