Double Backup; Front View; Rear View - E&C ITS 3000 Installation And Operation Manual

3.3. Double Backup

When AC fails, the entire load will be taken care by UPS-1 and
UPS-2 will be running without any load. If UPS-1 is shutting
down due to Battery low, UPS-2 will take care of the entire
load automatically.

3.4. Front View

Source
UPS 1
UPS 2
AC Utility

3.5. Rear View

Load On
UPS 1
UPS 2
Load
AC Utility
Page 5
Installation and Operation Manual
ITS 3000