User Manual 10H52188UM51 - Rev. 1 - 09/2011 35
Liebert NXC Parallel UPS Installation and Commissioning
UPS 1
Bypass
Bypass input
Main input
UPS 2
UPS 3
UPS 4
Output
LBS cable
Parallel cable
Connect to load
STS
Bypass input
Main input
Main
Bypass
Main
Bypass
Main
Bypass
Main
Output
Output
Parallel cable
Output
Note: UPS1 and UPS2 are master system, UPS3 and UPS4 are slave system
Figure 3-8 LBS system schematic diagram
Note
For the DIP switch settings and the parallel commissioning, refer to 3.3.2 and 3.5 respectively.
3.5.2 Installing External Protective Device
See 2.3for details of installation and type selection.
3.5.3 Connecting Power Cables
In double bus system, refer to 2.4 and 3.3 to select the power cables for single UPS and parallel system respectively. The bypass
input power and mains input power must use the input terminal of the same neutral line. The leakage current protective device
should be installed before the input terminal.
3.5.4 Connecting LBS Cables
In double bus system, connect the two ends of the LBS cable to any LBS port of the two parallel systems respectively, as shown
in Figure 3-9. The third port on the left is DB9 male port (needle shape), the fourth port on the left is DB9 female (hole shape).
Note
1. The appearances of the LBS ports (see Figure 1-3) and the parallel ports (see Figure 1-3) are the same, but the positions are
different. Be careful when inserting and connecting to avoid incorrect connnection.
2. For the double bus system formed by parallel UPS, it is recommended to prepare two LBS cables, one is used to connect any of
the two LBS ports of the two parallel system, the other is redundant cable which is used for reliable connection.
3. As shown in Figure 3-9, one cable is LBS cable, others are parallel cables.
Bypass input
Main input
Bypass
Main
UPS 1
Bypass
Main
UPS 2
Bypass
Main
UPS 3
Bypass
Main
UPS 4
Bypass input
Main input
Output
Output
Output
Output
Parallel cable
Parallel cable
LBS cable
STS
Connect to load
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