KR series
（
6
-
10kVA
）
user
’s manual
- 12 -
Parallel units all have independent bypass, two UPS can directly parallel without parallel control cabinet or
extra public bypass input, so that they are easy to install and maintain.
There are below four main working modes of parallel system:
1
、
Working mode of utility normal (solid line is Energy flow of UPS) as shown in Fig.3.2-2.
DC/DC
PFC
PFC
DC/DC
Bypass Switch
Inverter
Load
Battery
Main(UPS2)
AC Input
Bypass Switch
Inverter
Battery
Main(UPS1)
Fig 3.2-2 Working mode of utility normal
2
、
Working mode of utility abnormal (solid line is Energy flow of UPS) as shown in Fig.3.2-3.
PFC
DC/DC
DC/DC
PFC
Bypass Switch
Inverter
Battery
Load
Main(UPS2)
Bypass Switch
Inverter
Battery
Main(UPS1)
AC Input
Fig3.2-3 Working mode of utility abnormal
