Raymarine RL70C, Owner'S Handbook Manual

Page: 161 / 218

Chapter 8: Installation 147
8.4 Cable Runs
You need to consider the following before installing the system cables:
– You need to fit the power cable and, on a master display, the inter-unit
cable. Additional cables will be required if you are installing an integrated
system.
– All cables should be adequately cleated and protected from physical
damage and exposure to heat - avoid running cables through bilges or
doorways, or close to moving or hot objects.
– Acute bends must be avoided
– Where a cable passes through an exposed bulkhead or deckhead, a
watertight gland or
swan neck tube should be provided.
You need to run the following cables:
• Power/NMEA Input cable , supplied with the display unit. This has a
connector plug at one end for connecting the display unit, and 7 cores at the
other end for connecting the power supply and (optionally) NMEA inputs
(see
Section 8.8 ).
• Inter-unit cable , supplied with the scanner unit. This is Vinyl-covered and
shielded, with a connector plug at one end for connecting to the display unit
or extension cable.
• SeaTalk cable , optional, with SeaTalk connector(s) at one or both ends.
• HSB cable , optional.
• NMEA Output cable , optional, with a NMEA OUT connector at one end
only.
Power Cable
The HSB Series display is intended for use on ships’ DC power systems
operating in the 10.7 to 44 V DC range (that is, 12 V, 24 V systems and 32 V
systems). If the display is a master connected to a 2D or 4D radome scanner
only a 12 V or 24 V system must be connected. A 1.5 m (5 ft) power cable is
supplied for connecting the ship’s DC power to the radar via the display unit.
If a longer power cable run is required, use the supplied power cable to connect
to the display unit. Then use a suitable connector block to connect the free end
to the extension cable, taking particular care to ensure correct polarity. The
supplied power cable has a cross-section of 2.0 mm
2 .
In particular, for radar systems on vessels with 12 V power systems , longer
power cable runs may require larger wire gauges to minimise any voltage drop
in the cable. The scanner type and the length and type of the inter-unit cable also
affect the wire gauge required for the extension power cable.
Cable Runs