Emerson Wiring for Unit-to-Unit Communications-U2U, Liebert iCOM U2U Ethernet Network

Installing a Liebert iCOM Unit-to-Unit Network

5.3Wiring 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 10 Sample Liebert iCOM network configurations

				Wall Mount	Private
Sample	Input/Output	Large	Small	Large	Switch
Configuration	Boards	Displays	Displays	Displays	Required
1	2	0	2	0	No
2	2	0	2	1	Yes
3	3	0	3	0	Yes
4	2	1	1	0	Yes
5	8	4	4	1	Yes
6	32	32	0	0	Yes
7	32	27	5	5	Yes
8	32	0	32	32	Yes

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

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