Eaton 93PR Series User And Installation Guide

25-75 kW
User's and Installation Guide 14
2.2.3 Bypass Mode
The UPS automatically switches to Bypass Mode if it detects an overload, load fault, or internal failure. The
bypass source supplies the commercial AC power to the load directly. The UPS can also be commanded
to transfer to bypass manually through the display. The UPS status indicated on the display is “On Bypass”.
Figure 2-7: Path of current through the UPS in Bypass Mode shows the path of electrical power through the
UPS system when operating in Bypass Mode.
NOTE
ThecriticalloadisnotprotectedwhiletheUPSisinBypassMode.
In Bypass Mode, the output of the system is provided with three-phase AC power directly from the system
input. While in this mode, the output of the system is not protected from voltage or frequency fluctuations or
power outages from the source. Some power line filtering and transient protection is provided to the load but
no active power conditioning or battery support is available to the output of the system in the Bypass Mode
of operation.
The static bypass is comprised of a solid-state, silicon-controlled rectifier (SCR) static switch (SSW) and a
backfeed protection isolation device K5. The static switch is rated as a continuous-duty device that is used
anytime the inverter is unable to support the applied load. The static switch is wired in series with the
backfeed protection. The static switch, being an electronically-controlled device, can be turned on immediately
to pick up the load from the inverter without interruption. The backfeed protection is normally always closed,
ready to support the static switch unless the bypass input source becomes unavailable.
Figure 2-7: Path of current through the UPS in Bypass Mode
30-200 kW 17
User's and Installation Guide
NOTE
The critical load is not protected while the UPS is in Bypass mode.
Internal relay contacts
Figure 2-7: Path of current through the UPS in bypass mode
In bypass mode, the output of the system is provided with three-phase AC power directly from the
system input. While in this mode, the output of the system is not protected from voltage or frequency
fluctuations or power outages from the source. Some power line filtering and transient protection is
provided to the load but no active power conditioning or battery support is available to the output of
the system in the bypass mode of operation.
The static bypass is comprised of a solid-state, silicon-controlled rectifier (SCR) static switch (SSW)
and a backfeed protection isolation device K5. The static switch is rated as a continuous-duty device
that is used anytime the inverter is unable to support the applied load. The static switch is wired in
series with the backfeed protection. The static switch, being an electronically-controlled device, can
be turned on immediately to pick up the load from the inverter without interruption. The backfeed
protection is normally always closed, ready to support the static switch unless the bypass input
source becomes unavailable.
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.

Eaton 93PR Series Specifications

General

Brand	Eaton
Model	93PR Series
Category	UPS
Language	English