Liebert UPS System User Manual page 33

Chapter 3 Electrical Assembly
Fig. 3-3 Power cable connection of One branch utility source
5. Connect the Load to the U, V, W terminals of UPS output breaker Q5.
6.Connection of battery cables
The positive and negative cables of batteries are connected to the Positive and
Negative terminals of JX3 respectively.
7. Connection of Neutral cable
The neutral cable of bypass source is connected to the JX5 copper bar, that is
marked with "N/INPUT". The neutral cable of UPS output source is connected to
copper bar JX4, that is marked with "N/OUTPUT".
Note
The phase rotation of circuit breakers Q1, Q2, Q5 cannot be wrong and the phase
rotation is shown in Figure 3-4.
A
R
U
L1
A
R
U
L1
Input power cable
B C A B C
S T R S T
V W U V W
L2 L3 L1 L2 L3
Q1
B C A B C
S T R S T
V W U V W
L2 L3 L1 L2 L3
Fig. 3-4 Phase rotation
27
Wire terminal
Parallel power cable
A B C
R S T
U V W
L1 L2 L3
Q2 Q5
A B C
R S T
U V W
L1 L2 L3