
Options
5.0OPTIONS
5.1Load Bus Synchronization
The Load Bus Synchronizer (LBS) 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 LBS is used, one UPS system is designated as master, the other as slave.
The LBS option is typically used with
5.1.1Performance Requirements
The LBS 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
5.1.2LBS Cable and Settings
For Liebert
An optional,
The LBS cable is connected as illustrated in Figures 12 and 13.
Figure 12 Load Bus Synchronization cable connection in single module systems
Parallel Board | |
| X3 |
X4 |
|
LBS Cable
Parallel Board
X4 |
|
The parallel board is on the interior of the Liebert® NX™ UPS, above and left of the power electronics; see Figure 29.
UPS Module or | UPS Module or |
System #1 | System #2 |
28