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MECHANICAL INSTALLATION
Installation Considerations
Mounting the enclosure
2–12
For a successful installation, careful thought must be given to selecting the proper site for
the DGT-D and its antenna system. The location must be able to support antenna
mounting at a height and in a direction that provides an unobstructed radio signal
transmission path to associated DGT sites.
The antenna must aim at the antenna located at your Utility's DGT-R. The Utility will
provide you with the direction and coordinates to aim the antenna. In addition, the
antenna must be at a suitable height to achieve radio association with the Utility's
equipment. DGT-D equipment is offered with a number of standard options for antenna
feedline lengths. Select the feedline length necessary to connect the Yagi antenna to the
DGT Unit.
Radio signals travel primarily by line-of-sight, and obstructions between the transmitting
and receiving devices will affect system performance. If you are not familiar with the
effects of terrain and other obstructions on radio transmission, please contact Multilin for
information on arranging a Radio Path Analysis or Site Survey. In addition, the information
below will provide helpful background.
TERRAIN AND SIGNAL STRENGTH
A line-of-sight transmission path between the DGT-D sites is highly desirable and provides
the most reliable communications link. A line-of-sight path is achieved by mounting the
antenna on a tower, pole or other elevated structure that raises it to a height sufficient to
clear surrounding terrain and other obstructions.
The importance of a clear transmission path relates closely to the distance between the
DGT-U and the Utility's DGT-R. If that distance is limited, for example up to 3 miles (4.8 km),
then some obstructions in the communications path can usually be tolerated with minimal
impact. For longer distances, any substantial obstruction in the communications path
could compromise performance or block communications entirely
CONDUCTING A SITE SURVEY
There must be no doubt about the radio path and antenna height needed for your DGT site
to associate with other DGT stations. Planning and testing is necessary before a
permanent installation is begun. This is done through a path analysis and site survey
conducted by a qualified professional. A site survey gathers actual site information and
summarizes the installation factors specific to a given site. A computer path analysis
based upon the latitude and longitude coordinates of the DGT site assesses factors such
as terrain, distance, transmitter power, and receiver sensitivity, which are necessary to
predict the performance of the DGT installation.
There are two basic mounting arrangements for the DGT: wall mount or pole mount.
Methods for mounting the unit in both of these configurations follow. When planning the
installation, refer to the Dimensions section above, which shows the mounting dimensions
of the DGT Assembly.
The steps below describe mounting of the DGT unit to a wall or other flat surface. Ordinary
wood screws (with flat washers) can be used for mounting to a wooden surface. If it is to be
mounted to a drywall, masonry or other non-wooden surface, suitable fasteners will be
required that can support the weight of the unit.
WALL MOUNTING
To wall mount the unit, follow these instructions
1.
Hold the unit up to the wall in the desired mounting position. Have an assistant mark
the four mounting holes (see Dimensions section above) with a pencil or marker.
DGT DISTRIBUTED GENERATION TRIP CONTROL SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: INSTALLATION
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