Vertiv Liebert Load Bus Sync Controller, User Manual

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Vertiv
™
| Liebert
®
Load Bus Sync
™
Controller Installation Manual | 8
2.4 Liebert® NX™ and Third-Party Brand UPS in the Same Installation
The device can also be used to synchronize a Liebert
®
NX
™
UPS with other manufacturer’s UPS
systems. The Liebert
®
NX
™
units must be configured as slave devices so that they follow the phase
reference signal derived from the non-Liebert
®
master UPS. UPS #1 and UPS #2 may be
configured as parallel or single units, see Figure 6 .
Figure 6 Liebert® NX™ and third-party brand UPS
Installation Tips : UPS #1 and UPS #2 should be configured to follow the external
synchronization signal. This is achieved by setting the main synchronization source to external
signal. If UPS #1 and UPS #2 are not set to follow the external synchronization signal, the UPS will
be in phase with its own bypass line and will follow external synchronization only when the bypass
line is out of tolerance.
Source
Line B
Source
Line A
Power
Source B2
UPS 2
Power
Source B1
UPS 1
To Load
To Others
Static Switch
Power
Source A
UPS 1
UPS 2
L1 -Phase Signal
Neutral
To Others
Static Switch
Static Switch
Liebert
®
Load
Bus Sync
™
Controller