Mounting Racks
Section 3-3
Clearance between Racks
The Racks need to have sufficient room between each other to allow for I/O wir-
ing, and additional room to ensure that the I/O wiring does not hamper cooling.
The Racks must also be mounted so that the total length of the Connecting
Cable between all Racks in a given series does not exceed 50 m. As a general
rule, about 70 to 120 mm should be left between any two Racks. Consider fac
-
tors such as the width of the wiring duct, wiring length, ventilation, and ease of
access to Units, when determining the spacing between Racks. Greater space
is required between Racks when using certain CPU Bus and Special I/O Units.
Refer to the operation manuals for the Units you are using for details.
Cooling Fan
A cooling fan is not always necessary, but may be needed in some installations.
Try to avoid mounting the PC in a warm area or over a source of heat. A cooling
fan is needed if the ambient temperature may become higher than that speci-
fied. If the PC is mounted in an enclosure, install a cooling fan, as shown in the
following diagram, to maintain the ambient temperature within specifications.
Fan
PC
Louver
3-3 Mounting Racks
Each Rack must be mounted vertically, that is, with the printing on the front pan
-
els oriented as it would normally read. Racks may be directly mounted to any
sturdy support meeting the environmental specifications.
Whenever possible, use wiring conduit to hold the I/O wiring. Standard wiring
conduit should be used, and it should be long enough to completely contain the
I/O wiring and keep it separated from other cables.
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OMRON [ OMRON ELECTRONICS LLC ]
