Emerson Liebert NX 480V - Manual (Page 38)

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Figure 17 Connecting system parallel control cables
Auxiliary Dry Contact Cables
The external output breaker of each UPS must have Normally Open auxiliary contacts. These con-
tacts must be wired to connector X3 on the Parallel Logic Board (M3). See Figures 18 and 19.
Figure 18 Auxiliary dry contact cables for output breaker in multi-module system
!
CAUTION
The auxiliary control wire must be installed to ensure proper operation of the system.
NOTE
For startup procedure, 9.2 - UPS Startup.
X1-1 X1-2
X2-2 X2-1
Parallel Board
X4
X3 P5
P3
P4
P1 P2
X1-1 X1-2
X2-2 X2-1
Parallel Board
X4
X3 P5
P3
P4
P1 P2
X1-1 X1-2
X2-2 X2-1
Parallel Board
X4
X3 P5
P3
P4
P1 P2
X1-1 X1-2
X2-2 X2-1
Parallel Board
X4
X3 P5
P3
P4
P1 P2
1 2 3 4
UPS
Interconnecting
Cables
485-
P2 X2 2
485+
DBS
X3
P1 X2 1
:XT M A IN T