Raytheon HSB L755, Owner'S Handbook Manual

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2-30 HSB Series L755 and L760 Fishfinder
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2.8 System 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 (shield) 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
AWG 10 (6.0 mm
2
) multi-stranded cable.
If your vessel does not have an RF system, connect the drain wire to the
negative battery terminal.
DC Power Connection
The HSB Series Fishfinder is intended for use on ships’ DC power systems
rated from 10.7 V to 32 V.
The power connection to the display 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 display via its own
dedicated cable system and MUST be protected by a thermal circuit
breaker or fuse, installed close to the power connection.
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 system is not intended for use on “positive” ground vessels.
The power cable Ground (earth) 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 for further details.