6. Rectifier input K1 Input relay
7. Battery converter K3 Output relay
8. Battery breaker
(closed)
K5 Backfeed relay
9. Battery
In Bypass mode, the output of the system is supplied with three-phase AC power directly from the system
input. In this mode the system output is not protected from voltage or frequency fluctuations, or power
outages from the source. In Bypass mode, some power line filtering and transient protection is provided to
the load, but no power correction or battery backup is available to the output of the system.
The static bypass consists of a silicon-controlled rectifier (SCR) and a static switch (SSW). When the
inverter cannot support the load, the static switch operates continuously. As the static switch is an
electronically-controlled device, it can be turned on immediately to pick up the load from the inverter
without interruption.
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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.
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The Advanced Battery Management (ABM) 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. The UPS also protects batteries from damage caused by high current charging and
inverter ripple currents. Charging at high currents can overheat and damage batteries.
In the 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 the float stage and the charger operates in the constant voltage mode.
The rest mode begins at the end of the float charge mode; that is, after 48 hours of float charging (user-
adjustable). In the rest mode, the battery charger is completely turned off. The battery system receives no
charge current during this rest period of approximately 28 days (user-adjustable). During the rest mode,
the open circuit battery voltage is monitored constantly, and battery charging is resumed when necessary.
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The Eaton Powerware Hot Sync technology is an algorithm that eliminates the single point of failure in a
parallel system and therefore enhances system reliability. The Hot Sync technology is incorporated in all
three-phase Eaton UPSs, and it is utilized in both multi-module internal parallel and external parallel
systems.
The Hot Sync technology enables all UPMs to operate independently in a parallel system, even without
inter-module communications. The power modules utilizing the Hot Sync technology are completely
autonomous; each module monitors its 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
load conditions.
EATON 93T USER’S AND INSTALLATION GUIDE 614-40270
-
December 2023 www.eaton.eu 2266
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