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Input mains supply
L1,L2,L3,N
Fuse
Battery1
Figure 7-1 Typical parallel system (with common input, separate batteries and output/bypass distribution cabinet)
7.2.3 External Protective Device
Warning
Large ground leakage current: Before connecting the input power (including AC mains and batteries), the grounding
must be reliable.
Equipment grounding must comply with local electric regulations.
Refer to 3.1.7 External Protective Device.
7.2.4 Power Cable
The power cable wiring is similar to that of UPS module. The bypass and main input supplies must use the
same neutral line input terminal. If the input has a current leakage protective device, the current leakage
protective device must be fitted upstream of the common neutral sinking point.
Note
The lengths and specifications of the power cables of each UPS module, including the bypass input cables and UPS
output cables, should be the same. This facilitates load sharing in bypass mode.
For parallel system, you need to connect the parallel power cables. The connection procedures are as follows:
1. For UPS without output distribution module, remove the four copper bars on the bottom of the UPS cabinet,
as shown in Figure 7-2; connect these four copper bars respectively to the four terminals (A, B, C, N) of the
maintenance switch in the front of cabinet, which serve as output terminals, as shown in Figure 7-3.
Liebert APM 150 Integrated UPS Single Module And Parallel System
UPS1
Q1
Rectifier
STS
Charger
Inverter
Q5
L1,L2,L3,N
Q1EXT
QUPS
To load
Chapter 7 Parallel System & Dual Bus System
Input mains supply
L1,L2,L3,N
UPS2
Q1
Q3
Fuse
Charger
Battery2
Q5
Output distribution
Rectifier
Q3
STS
Inverter
L1,L2,L3,N
Q2EXT
QBYP
User Manual
57
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