Eaton 93E Specifications download pdf (Page 8)

EATON CORPORATION UPS and Power Quality Products Catalogue

Hot Sync® Technology

The number one function of a UPS is to supply continuous conditioned,

reliable electricity to critical loads. In the case of a single unit, reliability

can be increased by modular design, where redundant internal modules

can take over each others’ tasks, if one of the modules fails. To further

increase reliability, a true parallel configuration can be employed,

where two or more units share the load. A failed unit is isolated while

the remaining ones continue to support the critical load. Competitive

UPS products on the market utilise centralised or distributed load

sharing technology with a Master-Slave principle, which introduces

a risk of single point failure. The absolute reliability of a UPS system

can be reached with patented Eaton Hot Sync

parallel load sharing

technology. (Figure 1)

Hot Sync

technology is designed for parallel redundant N+1 systems to

satisfy 24/7 applications. It can also be used in parallel capacity systems

to benefit from scalability for customers' ever-increasing load demands.

Hot Sync

eliminates single point of failure, with the ability to

synchronise and support critical loads independently of other UPS

modules in the system. UPS modules can share loads without any

communication wiring to the outside world.

The secret here is a patented built-in digital signal processor (DSP)

algorithm, running continuously in each unit. It drives the UPS outputs

toward synchronisation and takes care of load sharing. If there is a

common bypass available, it is used as valid synchronisation source for

output. In the absence of common bypass, the processor makes subtle

adjustment to the inverter frequency on the basis of output power level

measurement in order to find a common frequency and load balance

among the units. There exists, as shown in Figure 2, a relationship

between the power imbalance and the voltage phase difference.

Hot Sync

technology allows full maintenance to be performed one-by-

one on redundant UPS modules without an external maintenance bypass

switch. The critical load does not need to be disconnected from the

conditioned power. Scheduled or unscheduled maintenance can

be perfomed with the load supported continuously by the UPS-grade

clean power.

Parallel Output, Load Bus

UPS 1

UPS 2

1+2

Power level difference diminishes

Frequencies are continuously

adjusted based on P

and P

Voltages out of phase

Outputs are synchronised

UPS 1

UPS 2

Figure 2. Well-balanced load share is achieved by adjusting output frequencies;

thus the phase difference between parallel UPS output voltages is forced to zero.

20%

10%

Failure probability / year

Utility

Single UPS

Modular UPS

Parallel redundant UPS

Hot Sync

99,99%

99,999%

99,9999%

No common logic

Hot Sync

Figure 1. Patented Hot Sync

technology provides the highest availability for

load.

User benefits

• Available for both single and three-phase products to meet any

mission-critical need up to 3.5 MVA (400V) systems

• Easy and modular parallel UPS system upgrade with additional

capacity or redundancy

• Eliminates single point of failure

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Eaton 93E Specifications Page 8

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