Power Requirement - Raymarine RD418HD User Manual

• Prevent the cable chafing where it enters and exits the mast.
• Minimize electrical interference by:
– Not running the cable near other electrical equipment.
– Not running the cable alongside power cables or antenna
cables for other equipment.

Power requirement

The HD Digital Radome Antenna must be supplied with power by
either a 12 V dc or a 24 V dc supply. Do NOT connect to a 32 V
system.
If you are replacing an existing Radome scanner with an HD Digital
Radome Antenna, you must also replace any existing cable with the
appropriate digital cable, as described in section 2.7 Cables.
If you connect to the power supply via an isolator switch, the
minimum switch rating is:
• For a 12 V system, 20 A.
• For a 24 V system, 15 A.
Caution: Do NOT connect to positive
ground system
Do NOT connect this product to a
positively-grounded system.
Power Supply Protection
The power supply must be protected by a suitable thermal circuit
breaker or fuse, fitted close to the power source. The protection
requirements are the same for both 18" and 24" HD Digital Radome
Antennae, and are as follows:
• In a 12 V system, protect the power supply with either a 10 A
thermal breaker, or a 15 A fuse.
16
• In a 24 V system, protect the power supply with either a 5 A
thermal breaker, or an 8 A fuse.
Power cable lengths
The total permitted lengths of power conductor run (i.e. power cable
plus cable extension) from the power source to the HD Digital
Radome Antenna are :
• for 12 V systems, 20 m (65 ft)
• for 24 V systems, 35 m (115 ft)
If you want to connect to a 12 V power system but a total power
conductor run of more than 20 m is necessary, the use of a suitable
voltage converter is recommended, to convert the 12 V supply
voltage to 24 V, and thus enable you to extend the run up to 35 m.
We recommend using a converter with a minimum 200 W output
capacity.
Grounding
These grounding requirements are applicable for Raymarine
equipment supplied with a separate drain wire or screen.
• The product power cable drain conductor (screen) must be
connected to a common ground point.
• It is recommended that the common ground point is a bonded
ground, i.e. with the ground point connected to battery negative,
and situated as close as possible to the battery negative terminal.
If a bonded ground system is not possible, a non-bonded RF
ground may be used.
HD Digital Radome User's Guide