Raymarine RL70C - 8.6 Display Unit Connections; Grounding the System

Chapter 8: Installation 151
8.6 Display Unit Connections
Grounding the System
It is important that an effective RF ground is connected to the system. You must
ground the display by connecting the drain wire (screen) of the Power/NMEA
Input cable to the nearest ground point of the ship’s RF ground system.
If you need to extend the wire, the extension wire should be an 8 mm braid or
6.0 mm
2
(AWG 10) multi-stranded cable.
If your vessel does not have an RF system, connect the drain wire to the -ve
battery terminal.
DC Power Connection
The HSB Series display is intended for use on ships’ DC power systems as
follows:
12 V and 24 V systems - Radome Scanners
12 V, 24 V and 32 V - Open Array Scanners and RayChart 520
The power connection to the radar should be made at either the output of
the battery isolator switch, or at a DC power distribution panel. Raytheon
recommends that power is fed directly to the radar via its own dedicated
cable system and MUST be protected by a thermal circuit breaker or fuse,
fitted close to the power connection. Refer to the HSB Series Radar
Scanners Owner’s Handbook for full details.
The DC system should be either:
• Negative grounded, with the negative battery terminal connected to the ships
ground.
• Floating, with neither battery terminal connected to the ships ground.
CAUTION:
This radar is not intended for use on “positive” ground vessels.
The power cable Earth screen connections must be connected to the ship’s
ground as described above.
Power for External Equipment
External equipment cannot be powered from the display’s SeaTalk
interface.
It must be powered from the ship’s supply or via a SeaTalk bus.
Refer to Section 8.8 Integrated Systems for further details.
Display Unit
Connections