Eaton 93PR Series, User And Installation Manual

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25-75 kW
User's and Installation Guide 15
2.3 UPS Features
The Eaton UPS has many features that provide cost-effective and consistently reliable power protection. The
feature descriptions provide a brief overview of the UPS standard features.
2.3.1 Advanced Battery Management
Advanced Battery Management technology uses sophisticated sensing circuitry and a three-stage charging
technique that extends the useful service life of UPS batteries while optimizing the battery recharge time.
ABM also protects batteries from damage caused by high current charging and inverter ripple currents.
Charging at high currents can overheat and damage batteries.
In charge mode, the batteries are recharged. Charging lasts only as long as it takes to bring the battery
system up to a predetermined float level. Once this level is reached, the UPS battery charger enters float
stage and the charger is operating in constant voltage mode.
Rest mode begins at the end of charge mode; that is, after 48 hours of float charging (customer adjustable).
In Rest mode, the battery charger is completely turned off. The battery system receives no charge current
during this rest period of about 28 days (customer adjustable). During Rest mode, the open circuit battery
voltage is monitored constantly, and battery charging is resumed when necessary.
2.3.2 Eaton Hot Sync
Eaton Hot Sync technology is an algorithm that eliminates the single point of failure in a parallel system and
therefore enhances the system reliability. The Hot Sync technology is incorporated in all Eaton 93PR UPSs,
and it is utilised in both multi-module internal parallel and external parallel systems.
Hot Sync technology enables all uninterruptible power modules (UPMs) to operate independently in a parallel
system, even without inter-module communications. The power modules utilising the Hot Sync technology
are completely autonomous; each module monitors their own output independently, to remain in complete
synchronization with the other modules. The UPM power modules share the load perfectly even in changing
capacity or changing load conditions.
Eaton Hot Sync technology combines digital signal processing and an advanced control algorithm to provide
automatic load sharing and selective tripping in a parallel UPS system. The load share control algorithms
maintain synchronization and load balance by constantly making minute adjustments to variations in the
output power requirements. The modules conform to demand and are not in conflict with each other for the
load. Eaton Hot Sync systems are capable of paralleling for both redundancy and capacity.
2.3.3 Module Hot Swap Feature
93PR UPS is modular and scalable power system designed for present data center. Hot swappable modules
such as universe power module (UPM), Static transfer
switch (STS), see Chapter 6.6 UPM control
instructions, communication module (CM), display module HMI etc. can fast response data
center critical requirements, shorten system maintenance time within 10 m
inutes, minimize system
maintenance time (lowest MMTR) and maximize system availability. As critical power system, 93PR UPS has
highest UPS availability and reliability.