Figure 4: Path of current through the UPS in the double conversion mode
A Static switch 1 Bypass input Main power flow
B Rectifier 2 Rectifier input
Energized
C Inverter 3 Output
De-energized
D Battery
converter
4 Battery breaker
Trickle current
E Battery
Closed Open
Single-/three-phase AC input power is converted to DC using a multilevel
converter with IGBT devices to produce a regulated DC voltage to the inverter.
The UPS status indicated on the display is Unit Online and the UPM status is
Active.
The battery converter derives its input from the regulated DC output of the
rectifier and provides regulated charge current to the battery. The battery is
always connected to the UPS and ready to support the inverter should the utility
input become unavailable.
The inverter produces a single-/three-phase AC output to the critical load. The
inverter uses multilevel converter technology with IGBT devices and pulse-width
modulation (PWM) to produce a regulated and filtered AC output.
© Eaton Corporation plc 2020. All rights reserved. Revision: 006 Document ID: P-164000493 23 (126)
Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide
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