Toshiba G9000 SERIES Installation And Operation Manual page 17

The conversion - inversion process eliminates any voltage transients or fluctuations existing
in the input power before it reaches the critical load.
The power drawn by the critical load is equally shared between all UPS systems when
multiple UPSs are in Parallel Operation. (Refer to
Figure 5-6 that shows a sample of Parallel Operation System Configuration.)
When in Parallel Operation, the rectifier inputs to all G9000 UPS Systems
in the Multi-Module System (MMS)-must be fed from a single source at
all times including any operation of Automatic Transfer Switches. All
G9000 bypass inputs must also be fed from a single source at all times
CAUTION
(not necessarily the same source as the rectifier inputs).
In the event of a UPS module failure during Parallel Operation, the critical load power will be
continually supplied and shared by all other UPS.
!
The Bypass Input breaker and cables are to be supplied and installed by
the user or contractor. (See WARNING 4 on page 5)
NOTE
G9000 1000-2000kVA Installation and Operation Manual 91469-007 9