Raymarine SL70M, Owner'S Handbook Manual

Page: 105 / 145

6-12 SL70M & SL70C PLUS Pathfinder Radar Displays
System
Con
nec
tion
s
6.6 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 display is intended for use on ships’ DC power systems rated at 12 V, 24 V
or 32 V. However, the operating voltage of the radar and radar/chartplotter
displays is limited by the scanner to which it is connected as follows:
12 V and 24 V systems Radome Scanner System
12 V, 24 V or 32 V 4 kW Open Array Scanner System
24 V or 32 V 10 kW Open Array Scanner System
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.
Raymarine 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 6.8 for further details.