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Installing the CMU
Installing the CMU
Perform this task to mount the CMU in the building or cabinet, and to connect it to
ground, power supply and PC.
Maximum operating ambient temperature for the CMU
WARNING
The CMU must be mounted on either a horizontal or vertical surface. The supplied
mounting bracket must be used. The CMU must not be operated in ambient
temperatures exceeding 40 deg C unless mounted in a Restricted Access Location.
At ambient temperatures over this limit, the temperature of the external metal case
parts of the ODU may exceed a touch temperature of 70 deg C. Heat warning
labels are fixed adjacent to the hottest parts, on the top of the unit adjacent to the
rear face and to the front panel mounted N type connector.
Operation of CMU in a Restricted Access Location
The CMU may be operated in ambient temperatures up to 55 deg C when it is
housed in a Restricted Access Location. Under these conditions the temperature of
the external metal case parts of the ODU may exceed a touch temperature of 70
deg C, but will be less than 90 deg C.
A restricted access location is defined (in EN 90650-1) as one where access may
only be gained by use of a tool or lock and key, or other means of security, and
access is controlled by the authority responsible for the location.
Examples of permissible Restricted Access Locations are:-
x
A lockable equipment room.
x
A lockable cabinet.
Access must only be gained by persons who have been instructed about the reasons
for the restrictions applied to the location and about any precautions that must be
taken.
5-70
HOT SURFACES: care should be taken when handling an operating
CMU.
Chapter 5 Installation
phn-1478_005v000
Apr 2010
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