Wiring for Unit-to-Unit Communications-U2U

Liebert iCOM Display Components and Functions

4.6Wiring for Unit-to-Unit Communications—U2U

The Liebert Challenger 3000/Liebert Challenger ITR with Liebert iCOM comes from the factory wired for stand-alone operation. Multiple units can be set up in a network for efficiency, ease of operation and easier control.

NOTE

U2U connections can be set up to link these units: Liebert Challenger 3000, Liebert Challenger ITR, Liebert DS and Liebert CW. Each unit must be equipped with a Liebert iCOM.

4.6.1Liebert 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. No more than 32 nodes may be input/output boards (32 cooling units). A small display is not considered a node. Small displays con- nect 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 2 Sample Liebert iCOM network configurations

Sample	Input/Output	Large	Small	Wall Mount	Private Switch	Ports Required
Configuration	Boards	Displays	Displays	Large Displays	Required	on Switch

1	2	0	2	0	No	NA
2	2	0	2	1	Yes	3
3	3	0	3	0	Yes	3
4	2	1	1	0	Yes	3
5	8	4	4	1	Yes	13
6	32	32	0	0	Yes	64
7	32	27	5	5	Yes	64
8	32	0	32	32	Yes	64

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

4.6.2Wiring 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, because the small display connects directly to the Liebert iCOM.

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 13).

3000/ITR specifications

The Emerson 3000/ITR is a powerful and versatile instrument designed for industrial automation and process control applications. This modular platform integrates advanced features and technologies tailored to meet the needs of diverse industries including oil and gas, pharmaceuticals, and manufacturing.

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