Raymarine L1250DRC, Owner'S Handbook Manual

Page: 52 / 246

2-20 HD Series Fishfinders
Gr
ound Co
nne
ct
ion
f
Figure 2-12: Power Connector
The RED wire must be connected to the feed from the positive (+) battery
terminal and the BLACK wire to the feed from the negative (–) battery
terminal. The shield wire (drain) should be connected to the ship’s RF ground
as described in
Ground Connection on page 2-20.
Install a quick blow 8 amp fuse on the red (positive) wire.
WARNING:
If the power connections are accidentally reversed the system will not
work. Use a multimeter to ensure that the input power leads are
connected for correct polarity.
There is no power switch on the DSM250. The unit turns on when the power
cord is attached to ship’s power and plugged into the
POWER
connector on the
connector panel.
Note: You should locate the DSM250 so that the power cord can be easily re-
moved, if necessary. If the sounder is placed in a difficult-to-reach location,
Raymarine strongly suggests installing an on/off switch on the DSM250 pow-
er cord at a point where it is easily accessible.
Ground Connection
As with the display unit, it is important that an effective RF ground is
connected to the system. A single ground point should be used for all
equipment. You may ground the DSM250 by connecting the drain wire
(shield) of the Power Input cable to the ship’s RF ground. If you need to extend
the wire, the extension wire should be an 8 mm braid or AWG 10 multi-
stranded cable.
Pin No. Function Color
1 Battery positive (12/24/32 V systems) Red
2 Battery negative Black
3 Shield (drain wire) No insulation
1 2
3
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