Emerson 30-200kVA Manuel D’Utilisation

For Liebert NX to NX dual bus configuration, interconnect the optional DBS cable between any DBS 

ports of two parallel systems as illustrated in Figure 34.

For Liebert NX to non- NX (whether another Liebert UPS range or not) dual bus configuration, one 

DBS interface box shall be mounted on the non- Liebert NX UPS and one on the Liebert NX UPS. In 

this situation, the other UPS system is always treated as a master and the following conditions are 

covered:

• Master and slave are both on inverter
• Master on bypass, slave on inverter

NOTE
Example shown with ring control cables (“8”) for DSB applied to two 1+1 paralleled systems.

NOTE
Extended DBS interface box is also used for extending DBS cable length up to 150 metres for