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One-Line Diagram
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.
For units up to 600 amps,
the entire power and
c
ontrol module can be
removed as an assembly.
A separate compartment
for option modules
provides safe and
c
onvenient field access.
So
urc
e 1
Source 2
System Output
CB1
CB3
CB4
CB2
CB5
K1
K2
K2 K3 K1
K3
True Internal Redundancy
The Liebert STS2 has triple-
redundant 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.
The t
w
o po
w
e
r su
p
plies feature true
dual-bus power distribution. Both
h
a
v
e dual inputs, one from each AC
in
p
u
t s
o
urc
e. All power connections
have diode protection, so that internal
or e
x
ternal faults cannot propagate.
The r
e
sult is a r
u
g
ged
, fault-resilient
package that is optimized for real-
w
or
ld applications.