Vertiv Liebert CRV - Connecting the Canbus Cable and Ground

NOTE: Both probes on the 2T sensor must be installed on the same rack.
2. Install the 2T sensor probes the front door of the rack (inside or outside the door):
a. Using a cable tie, secure the sensor wire so that a probe is approximately 12in. (305mm)
from the top and in the center of the front door.
This sensor monitors hot air coming over the top of the rack from the hot aisle.
NOTE: Do not wrap cable ties around the actual sensor probe. If the rack has no door, secure the
probes to the rack at the side of the front opening.
b. Use a cable tie to secure the sensor wire of the second probe to the front door so that it is
centered in front of the heat-generating equipment drawing air.
If the cabinet is completely-filled with equipment, determine the center based on cabinet
width and height.
c. With probes in place, use cable ties to route the wires neatly up the rack door and into the
rack leaving enough slack in the wire so that the rack door opens and closes without
binding or pinching the wire.
d. Using the supplied, hook-and-loop fastener, connect the 2T-sensor housing to the rack in
an easily-accessible location and with the sensor number visible.
3. Repeat step 2 until all sensors are installed.
9.1.5 Connecting the CANbus cable and ground
WARNING! Risk of electric shock. Can cause equipment damage, injury or death. Open all local
and remote electric power supply disconnect switches and verify with a voltmeter that power is
off before working within any electric connection enclosures. Service and maintenance work
must be performed only by properly trained and qualified personnel and in accordance with
applicable regulations and manufacturers’ specifications. Opening or removing the covers to
any equipment may expose personnel to lethal voltages within the unit even when it is
apparently not operating and the input wiring is disconnected from the electrical source.
Cabling considerations:
• For cable up to 150-ft (45-m) long, no special considerations are needed.
• Cable 150 ft (45m) to
• 300 ft (91m), contact the factory.
• The CANbus cable network requires a ground wire.
Vertiv | Liebert CRV Installer/User Guide | 103