47
CAUTION !!! You must never set the operation modes of parallel connected UPS units to
“ONLINE”, otherwise serious damage may occur in UPSs.
Note:
As seen in the figure, the outputs of parallel UPS units should be connected to each other
using an AC distribution board.
Figure 4.3
DS300HB Series Parallel UPS Power Connections
BATTERIES
U V W N
LOAD
FUSES
AC
BYPASS AC INPUT
MAIN AC INPUT
AC DISTRIBUTION
U1
V1
W1
N1
U2
V2
W2
N2
+
-
+
-
UPS1
K3
K2
K2
K
4
K
5
K
6
K
7
K
8
K
9
K
1
0
K
1
1
K12 K13 K14
K1
U V W N
AC OUTPUT1
+
-
+
-
BATTERIES
UPS2
K3
K2
K2
K
4
K
5
K
6
K
7
K
8
K
9
K
1
0
K
1
1
K12 K13 K14
K1
U V W N
AC OUTPUT2
FUSES
+
-
+
-
BATTERIES
UPS3
K3
K2
K2
K
4
K
5
K
6
K
7
K
8
K
9
K
1
0
K
1
1
K12 K13 K14
K1
U V W N
AC OUTPUT3
FUSES
LOAD BRAKE
SWITCH
