Eaton 93E UPS 15-80 kVA (380/400/415 V)
Installation and Operation Manual
© Eaton Corporation plc 2015. All rights reserved.
Revision: 001
Document ID: 614-01975-00
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to produce a regulated and filtered AC output. The AC output of the
inverter is delivered to the system output through the output relay.
If the utility AC power is interrupted or is out of specification, the UPS
automatically switches to the battery mode to support the critical load
without interruption. When utility power returns, the UPS returns to the
normal mode.
If the UPS becomes overloaded or unavailable, the UPS switches to the
bypass mode. The UPS automatically returns to the normal mode when
the overload condition is cleared and system operation is restored within
the specified limits.
If the UPS suffers an internal failure, it switches automatically to the
bypass mode and remains in that mode until the failure is corrected and
the UPS is back in service.
6.2.3
High-efficiency mode
When the UPS is operating in the HE mode, commercial AC power is
supplied directly to the critical load through the internal bypass with the
power module in a standby state. If a commercial power brownout,
blackout, overvoltage, undervoltage, or out-of-tolerance frequency
condition occurs, the system forward-transfers to the normal mode
(double-conversion on demand) or to the battery mode. When the input
line returns to the normal operating range, the UPS returns to HE
operation. For charging batteries in the HE mode, the UPS reverts to the
normal mode to charge the batteries, and returns to the HE mode when
the charge cycle is complete.
When selected, the HE mode is a normal operating mode and not an
alarm condition. While the UPS is in this mode, the NORMAL light at the
front display illuminates.
6.2.4
Bypass mode
CAUTION
While the UPS is in the bypass mode, the critical load is not protected
from voltage or frequency fluctuations or power outages.
The UPS automatically switches to the bypass mode if it detects an
overload, load fault, or internal failure. The UPS can also be transferred