Raymarine autopilot control unit - Manual (Page 74)

Chapter 5: Installation 57
Chapter 5: Installation
5.1 Planning the Installation
This chapter explains how to install and connect the ST7000 Plus
autopilot control unit. Before starting the installation, decide how you
will site the unit and run the cables.
EMC Installation Guidelines
The design and manufacture of Raytheon equipment and accessories
conforms to the appropriate Electromagnetic Compatibility (EMC)
standards, but good installation is required to ensure that performance
is not compromised.
To avoid the risk of operating problems, all Raytheon equipment and
cables connected to it should be:
• At least 1 m from any equipment transmitting or cables carrying
radio signals e.g. VHF radios, cables and antennas. In the case of
SSB radios, the distance should be increased to 2 m.
• More than 2 m from the path of a radar beam. A radar beam can
normally be assumed to spread 20° above and below the radiating
element.
• The equipment should be supplied from a different battery than the
one used for engine start. Voltage drops below 10 V in the power
supply to our products can cause the equipment to reset. This will
not damage the equipment, but will cause the loss of some
information and can change the operating mode.
• Genuine Raytheon cables should be used at all times. Cutting and
rejoining these cables can compromise EMC performance and so
should be avoided unless called for in the installation manual.
• If a suppression ferrite is attached to a cable, this ferrite should not
be removed. If the ferrite has to be removed to facilitate installation
it must be reassembled in the same position.
If your Raytheon equipment is going to be connected to other
equipment using a cable not supplied by Raytheon, a suppression
ferrite MUST always be fitted to the cable close to the Raytheon unit.
The following illustration shows the range of suppression ferrites fitted
to Raytheon equipment.
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