Emerson STS2 User Manual
AC Power
For Business-Critical Continuity
™
Liebert®STS2 Static Transfer Switch2
The Cornerstone of High-Availability Power Systems
The Power to Protect Your Critical Operations
For maximum availability applications, the Liebert Static
Transfer Switch2 (STS2) provides an automatic, seamless
transfer between your critical load and the outputs of two
independent UPS systems in a dual-bus power configuration.
If the primary UPS should fail, the switch will automatically
transfer the loads to the alternate UPS.
Liebert is the market leader in dual-bus power systems,
building the world’s most reliable UPS and Static Transfer
Switch products. Liebert STS2 further extends our
market leadership with design benefits unmatched by
competitive products.
Standard Features Of The
Liebert STS2 Provide Greater
Overall Protection
Reliability:
100% rated, fuseless design.
Hot-swappable circuit breakers.
sh memory enables firmware updates while
a
Fl
supporting critical load.
Rack-out control/power assembly on units up to
600A to allow maintenance, service or full
acement without disrupting the critical load.
l
p
e
r
Flexibility:
ernal CANBUS protocol: high-bandwidth
t
In
communication between system components via
ed-pair cables. Options can be added as
t
wis
t
simple network nodes.
Dual-lug installation bus with pem nuts for
single-hand installation and “hot” torque service.
Low Total Cost Of Ownership:
Conservative design margins and excellent
overload capacity.
UL listed.
Color Touch-Screen Interface
The color touch-screen LCD interface allows
uickly check the status of the unit and
o q
u t
o
y
identify problems. The controls of the Liebert
STS2 are intuitive and simple.
vided into three segments. In addition to a system
i
or is d
onit
CD m
olor L
The c
mimic diagram, there is a Status/Alarm panel and a section dedicated to
perator instructions and menus. The screen allows you to configure the unit,
o
ontrol of the preferred source, auto/manual retransfer selection,
g the c
in
d
lu
inc
alarm notification and other system setpoints. You benefit from improved
perator effectiveness, reduced training time, and less chance of operator error.
o
2
For units up to 600 amps,
the entire power and
ontrol module can be
c
removed as an assembly.
True Front-Access Design
All mechanical and electronic components of the Liebert
STS2 are accessible from the front of the unit for
installation and service—no side or rear access required.
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.
Designed for maintainability, with all key components
visible and accessible from the front of the unit,
without shutting down the connected load.
True Internal Redundancy
The Liebert STS2 has tripleredundant logic. Each DSP
controller is capable of working
independently, and each helps
monitor the other two. If one
malfunctions, the other two lock it
out. Each controller has power
feeds from both power supplies.
A separate compartment
for option modules
provides safe and
c
onvenient field access.
plies feature true
p
r su
e
w
o po
w
The t
dual-bus power distribution. Both
e dual inputs, one from each AC
v
a
h
e. All power connections
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o
t s
u
p
in
have diode protection, so that internal
ternal faults cannot propagate.
x
or e
, fault-resilient
ged
g
The r
sult is a r
e
u
package that is optimized for real-
ld applications.
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w
One-Line Diagram
e 1
urc
So
CB1
K1
K2 K3 K1
CB4
CB3
System Output
CB2
K2
K3
Source 2
CB5
3
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