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Liebert
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4.3.5 Install CANbus Cable Between 2T Sensors
No special considerations are required for cable up to 150 ft. (45m) long. A CANbus isolator (Liebert
Part # 301275G1S) is required for cables between 150 ft. and 300 ft. (45m and 91m). Contact the
factory if using CANbus cables longer than 300ft (91m).
The CANbus cable network requires a ground wire. The grounds are connected at each 2T sensor, the
rear of the front display and must be terminated to a field-installed ground ring in the low-voltage
electrical panel. Figure 75 show the connected grounds on a 2T sensor. The illustration on the right
in Figure 75 shows the rear of the front display with the factory-installed CANbus cable between the
display and main board replaced with a 6-foot (1.8m) grounded CANbus cable (Part # 300157G1).
Follow these guidelines when routing CANbus cable to ensure reliable communication.
• Use approved hangers, such as telephone wire/RG-6 coaxial wired hangers; do not secure cables
with any method that might damage them.
• Limit bends to less than four times the diameter of the cable.
• Avoid deforming cables when securing in bundles and when hanging them.
• Keep cables away from devices that may introduce interference, such as high-voltage wires,
machines, fluorescent lights, and electronics. High-voltage sources must be at least 12 inches
(305mm) from CAN wires.
• Avoid stretching cables.
• Ensure that cables have the correct pin-outs. Mismatching wire pins at the RJ12 connection will
damage the CAN device.
Cables may be purchased from your local Emerson distributor or made on site. Table 16 lists part
numbers for manufactured and tested CANbus cables.
If making cables, follow these specifications:
• RJ12-6P6C long-body connectors (two per cable)
• 24 gauge, six-conductor, three twisted pair cable (minimum eight twists per foot)
• Low capacitance, 15 pF/FT or less
• Braided shield or foil shield with drain wire
• Shield wired to ground at indoor unit
• Plenum rated NEC type CMP, if required by national or local codes
Caution must be used when making CAN cables because communication transmit/receive and DC
power wires are both part of this communication connection. Mismatching wire pins at the RJ12
connection will damage the CAN device. Extreme caution should be taken when making cables. See
Figure 74 for RJ12 pin callout.
Table 16 Liebert CAN cable part numbers
Liebert PN Description / Length
300157G1 WH REMOTE CAN P66/P67 6'
300157G2 WH REMOTE CAN P66/P67 10'
300157G3 WH REMOTE CAN P66/P67 20'
300157G4 WH REMOTE CAN P66/P67 30'
300157G11 WH REMOTE CAN P66/P67 15'
300157G13 WH REMOTE CAN P66/P67 40'
300157G14 WH REMOTE CAN P66/P67 50'
300157G5 WH REMOTE CAN P66/P67 60'
300157G16 WH REMOTE CAN P66/P67 80'
300157G17 WH REMOTE CAN P66/P67 100'
300157G7 WH REMOTE CAN P66/P67 120'