CNX Card Cage System Crestron
CNRACKX
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CNX Card Cage System: CNRACKX
Operations Guide - DOC. 8133
NOTE:
Reliable grounding of rack mounted equipment should be maintained.
Particular attention should be given to supply connections other than direct
connections to the branch circuit. (e.g., use of power strips).
Two “rack ears” are provided with the CNRACKX so that the unit can be rack
mounted. These ears must be installed prior to mounting. Complete the procedure
below to attach ears to CNRACKX:
1.
At the left-front side of the unit, position a rack ear so that its drilled
holes align with the four unused holes and secure the ear with four
supplied #6-32 screws, as shown below.
Ear Attachment for Rack Mounting
SECURE WITH
FOUR #6-32 SCREWS
PER EAR (SUPPLIED)
2.
Repeat step 1 of this procedure to attach the remaining ear to the right-
front side.
Network Wiring
NOTE:
This section only applies to those applications using 4-wire Cresnet wiring.
When calculating the wire gauge for a particular network run, the length of the run
and the load factor of each network unit to be connected must be taken into
consideration. If network units are to be daisy-chained on the run, the load factor of
each network unit to be daisy-chained must be added together to determine the load
factor of the entire chain. If the network unit is a home-run from a Crestron system
power supply network port, the load factor of that network unit is the load factor of
the entire run. The length of the run in feet and the load factor of the run should be
used in the following resistance equation to calculate the value on the right side of
the equation.
Resistance Equation
R = Resistance (refer to table below)
L = Length of run (or chain) in feet
LF = Load factor of entire run (or chain)
R <
L x LF
40,000
Where:
The required wire gauge should be chosen such that the resistance value is less than
the value calculated in the resistance equation. Refer to the table below:
