Emerson Liebert NX 10-30kVA - Manual (Page 40)

Option Installations
32
5.2.2 Features of Parallel System
• The hardware and firmware for parallel UPS module operation is standard in the NX, and the
configuration can be set up by changing the settings in configuration software.
• It is easy to install the parallel cables in a ring, providing high reliability and redundancy. And
the intelligent paralleling logic provides the user with maximum flexibility. For example, shut-
ting down or starting up the UPS modules in the parallel system can be done in any sequence. If
an overload transfer occurs, the whole system can recover automatically from bypass mode after
the overload is cleared.
• The total load of the parallel system can be queried from each module’s liquid crystal display
screen.
Figure 22 1+N system block diagram
NOTES:
1. Install in accordance with national and local electrical codes.
2. The equipment ground connection must be connected to the system ground wire.
3. UPS AC input and AC output cables must be run in separate conduits.
4. Control wiring and power wiring must be run in separate conduits.
5. See Electrical Data Specification Sheet U3818101 for individual configurations.
CB1
208V 60Hz
4W 208V 60Hz
3 or 4W
CB3 CB4
CB2
CB5 CB6
CB7 CB8
UPS1
208V 60Hz
UPS2
208V 60Hz
UPS3
208V 60Hz
4W
4W
4W