External Protective Devices; Power Cables; Figure 16 Dry Contacts, Multiple Ups Modules With Distribution Panels - Emerson Liebert NX User Manual

UPS Multi-Module Installation

Figure 16 Dry contacts, multiple UPS modules with distribution panels

UPS 1
M3 Board
X3
Ext. Maint. Ext. Out
1 2 3 4
Q1Ext
QUPS
To Load
3.2.2

External Protective Devices

Refer to the instructions in 1.0 - Single Module UPS Installation.
3.2.3

Power Cables

The wiring of power cables is similar to that of single module system. The Bypass and the Main input
sources must be referenced to the same neutral potential and input earth leakage monitoring devices,
if installed, must be located upstream of the common neutral sinking point. Refer to the instructions
in 1.0 - Single Module UPS Installation.
NOTE
The length and specification of power cables including the bypass input cables and UPS output
cables should be the same. This facilitates load sharing when operating in bypass mode.
Input Distribution Panel
UPS 2
M3 Board
X3
Ext. Maint. Ext. Out
1 2 3 4
Q2Ext
Output / Bypass Distribution Panel
27
UPS N
M3 Board
X3
Ext. Maint. Ext. Out
1 2 3 4
QnExt
QByp