Emerson Liebert CRV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 C R 0 2 0 R A 1 C 7 S D 1 8 1 1 E L 1 0 P A - Manual (Page 105)

Operation in Teamwork Mode
97 Liebert ® CRV ™
11.0 O
PERATION IN
T
EAMWORK
M
ODE
11.1 Unit-to-Unit Network Wiring
Liebert CRV’s can be connected in a unit-to-unit, or U2U, configuration, which allows multiple units
to communicate with each other, sharing of local unit status and sensor readings. The U2U network
will allow up to 32 units to be connected within a single group and up to 99 different groups to exists
on the same physical network. Groups can be used to create zones of influence so that only the Liebert
CRV’s serving a common area will work together and back each other up.
The U2U setup unlocks the use of Lead-Lag/Rotation, Cascade and Teamwork Modes 1 and 2.
Lead-lag/rotation allows a standby Liebert CRV to activate based on an alarm or on a rotation
based on time.
Cascade provides staging of the Liebert CRV’s based on the actual temperature and its relation to
the temperature setpoint.
Teamwork Modes 1 and 2 use the collective temperature information from all Liebert CRV’s on the
U2U network within the same group to determine how the group of Liebert CRV’s should operate. To
help manage the large amount of sensor information Liebert iCOM ® allows the sensor data to be used
as an average or a maximum value of all temperature sensor readings at both the local and system
level.
Different groups can be configured to operation in different teamwork modes. If one Liebert CRV
group serves a nonbalanced load, Teamwork Mode 2 will share all sensor data, prevent conflicting
modes of operation between units but still allow each Liebert CRV to modulate based on the unit’s
local sensor readings. Another group of Liebert CRV’s can be configured to operate in Teamwork
Mode 1 that will share all sensor data, prevent conflicting modes of operation between units but will
modulate all Liebert CRV’s at the same capacity based on the U2U sensor readings.
11.2 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 must be dedicated to supporting only Liebert iCOM
communication. The U2U network cannot be connected to the building or IT network. If network
communication is ever lost, 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
connected, no more than 32 may be input/output boards (32 cooling units).
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:
[email protected]