No system-level single point of failure•
Paralleled UPMs operate completely independently. •
One module cannot affect or interfere with the others –
no domino effect scenario
No added circuitry is required for parallel operation. Any •
standard UPS can be used in a parallel system without
modification
This patented and proven technology has been suc-•
cessfully deployed in thousands of systems around the
world
Key design features of Hot Sync systems
Powerware Hot Sync technology boosts system reliability
In systems with multiple uninterruptible power modules (UPMs),
the 9395 leverages the synchronization, load sharing and selec-
tive trip capabilities of Eaton’s patented Powerware Hot Sync
technology. These capabilities are integral to the ultimate systems
availability that is the primary requirement for any parallel UPS
configuration.
The Hot Sync system functions automatically without any depend-
ence on centralized, external control.
Powerware Hot Sync utilizes a peer to peer control architecture,
as opposed to the ubiquitous master/slave controls found in com-
petitive systems. This unique architecture eliminates the need for
a single UPM/UPS to depend on any outside source for its con-
trol. The multiple UPMs/UPSs simply monitor their own internal
metering, and use simple mathematical computations to remain
synchronized, share the load equally, and detect and isolate mal-
functions. This architecture does not require extra circuitry or
added complex wiring in order to function in parallel. Therefore, it
eliminates huge bundles of control wiring, hundreds of electrical
connections, removes the need for a failure-prone central control
thus eliminating complexity and enhancing reliability.
Ultimate reliability in the implementation of parallel AC power sys-
tems guarantees system autonomy and simple instrumentation.
Sync Control
Sync Control ensures that the output of two (or more) separate
UPSs (single modules or parallel systems) remain in phase with
one another so static transfer switches connected between the
separate distribution paths may change state seamlessly when
necessary.
Inherent redundancy option for highest availability
Surveys focused on efficiency in data centers reveal that UPSs are
often underloaded–frequently at less than 50%. To capitalize on
this trend and create even greater reliability, you have the option
to configure the multi-module 9395 with inherent redundancy.
Anytime the load is below 50% capacity, it is automatically redun-
dant. This option might be the single most important feature that
saves customers from dropping their load. Traditional UPS manu-
facturers cannot deliver this additional availability without adding a
more costly second UPS module.
Scalable, redundant architecture for current and future needs
The 9395 combines the reliability and redundancy of a multi-
module UPS into an integrated, pre-wired solution. With a unique,
flexible design that provides scalability, the UPS can adapt to
future changes in load demands and new requirements for higher
reliability without requiring the purchase of an additional UPS. For
example, the 9395 UPS enables you to add a 275 kVA UPM in the
field for N+1 redundancy or capacity (dependent on static switch
rating).
Patented Hot Sync technology provides highest availability for load
On site upgrade 550 kVA redundant
20%
10%
99.99% 99.999%
Single UPS
Failure probability / year
Modular UPS
Load
No common logic
Parallel redundant UPS
Hot Sync®
Hot Sync®
99.9999%
4 EATON CORPORATION Power Xpert
TM
9395 UPS
Jul12•9395 UPS 225-1100kVA.indd 4 7/18/12 12:34 PM
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