Liebert NX 10kVA, Руководство по установке

Страница: 39 / 68

Appendix
33
5.0 O
PTIONS
5.1 Dual Bus Synchronizer
The Dual-Bus Synchronizer (DBS) keeps the output of two independent UPS systems or parallel UPS
systems in synchronization even when the systems are operating in different modes and even when
either or both systems are operating on batteries. When the DBS is used, one UPS system is desig-
nated as master, the other as slave.
The DBS usually is used with Smart Switch to achieve Dual Bus Power Supply configuration.
5.1.1 Performance Requirements
The DBS operates under the following conditions:
• Both master and slave are on inverter
(either system may be on inverter through the rectifier or on inverter through the batteries)
• Master on inverter, and slave on bypass
• Master on bypass, and slave on inverter
• Master and slave on bypass IF the bypass source is the same for both systems
5.1.2 DBS Cable and Settings
For Paradigm-to-Paradigm dual bus configuration, with the help of only one optional DBS cable, the
built-in DBS will operate normally without extra DBS control box or interface box. The DBS port is
X4 on the Parallel Board (M3).
An optional, 9-pin DBS cable is used to connect two UPS systems through each system’s DB9 port on
its parallel board. For two parallel systems, the DBS cable can be mounted between any two units
belonging to different parallel systems. For information about the DBS kit or to order the optional
equipment, see your local Liebert representative.
The DBS cable is connected as illustrated in
Figure 18 .
Figure 18 DBS cable connection
The DBS function is activated with configuration software; when the DBS takes effect, the graphic
LCD will display “LBS active.”
X1-1 X1-2
X2-1 X2-2
Parallel Board
X4
X1-1 X1-2
X2-1 X2-2
Parallel Board
X4
X3
DBS Cable
UPS Module or
System #1
UPS Module or
System #2