Wiring For Unit-To-Unit Communications-U2U; Wiring A Liebert Icom U2U Network; Figure 28 Connecting Two Cooling Units, Each With A Small Display Using A Crossover Ethernet Cable; Table 11 Sample Liebert Icom Network Configurations - Emerson Liebert Challenger 3000 User Manual

5.3 Wiring for Unit-to-Unit Communications—U2U
Cooling units come from the factory-wired for stand-alone operation.
Liebert iCOM U2U Ethernet Network
The Liebert iCOM U2U network must be isolated from other network traffic. The network switch(es)
that connect Liebert iCOM controls need to be dedicated to supporting only Liebert iCOM communi-
cation. The U2U network cannot be connected to the building or IT network. If network communica-
tion is ever lost (failed network switch, etc.), all Liebert iCOM-controlled cooling units will continue to
operate as independent units.
The Liebert iCOM control can support up to 64 nodes on one network. An input/output board, large
display, and large wall-mount display are each considered one node. Of the 64 nodes that may be con-
nected, no more than 32 may be input/output boards (32 cooling units). A small display is not consid-
ered a node. Small displays connect directly to input/output boards that do not have large displays
attached to them. The following table illustrates how a network can be configured.
Table 11 Sample Liebert iCOM network configurations
Sample
Configuration
1
2
3
4
5
6
7
8
Network communication can be configured during system startup by a Liebert-trained technician. For
technical issues contact:
Liebert Technical Service
1050 Dearborn Drive
Columbus, Ohio 43235
Telephone: 1-800-LIEBSRV (1-800-543-2778)
E-Mail: technicalservice@emersonnetworkpower.com
5.3.1

Wiring a Liebert iCOM U2U Network

Small Displays
Two cooling units, each with a small display: To network two cooling units, each with a small
display, connect a crossover CAT5 cable between the P64 connectors on each cooling unit's Liebert
iCOM input/output board. A network switch is not needed (see Figure 28).

Figure 28 Connecting two cooling units, each with a small display using a crossover Ethernet cable

Three or more units with small displays: To network three or more cooling units, each equipped
with a small display, connect a straight-through CAT5 Ethernet cable from the P64 connector on each
cooling unit's Liebert iCOM input/output board to a common network switch (see Figure 30).
Input/Output Large
Boards Displays
2 0
2 0
3 0
2 1
8 4
32 32
32 27
32 0
46
Installing a Liebert iCOM Unit-to-Unit Network
Wall Mount
Small Large
Displays Displays
2 0
2 1
3 0
1 0
4 1
0 0
5 5
32 32
Private
Switch
Required
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes