Liebert UPS System user manual Power cable connection of One branch utility source

Chapter 3 Electrical Assembly

Wire terminal

Input power cable

Parallel power cable

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	B	C	A	B	C	A	B	C
R	S	T	R	S	T	R	S	T
U	V	W	U	V	W	U	V	W
L1	L2	L3	L1	L2	L3	L1	L2	L3

Q1

Q2

Q5

	A		B		C
R		S		T
U		V		W
L1		L2		L3

	A		B		C
R		S		T
U		V		W
L1		L2		L3

	A		B		C
R		S		T
U		V		W
L1		L2		L3

Fig. 3-4 Phase rotation

27