Furuno LH-3000, Operator'S Manual

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1. INSTALLATION
8
Floating ground
The LH-3000 has a floating ground. What this means is that the heat sink ground is floating
and will not ground batteries if they are connected to the ship’s chassis. To maintain a
floating ground:
1. Use a stereo plug when connecting a 4 ohm speaker to the external speaker plug.
Connect it as shown in the illustration below.
Do not use for battery -
use for ship's earth only
Stereo plug
2. Do not connect any of the output connectors on the rear panel to the ship’s ground.
3. SP outputs are floating and must not be connected to either battery or the rear panel.
Use a normal two conductor insulated speaker wire for the horn speaker.
Siren mode switch (for LH-3000-CG)
To use the siren mode function, connect a toggle switch whose specifications are as shown
below to the burglar alarm terminal.
LH-3000C
ALRM
4
5
J3
SIREN
ALARM
OFF
Alarm SENSOR
Toggle switch specifications
Circuit: SPDT (3P)
Switching function: ON-OFF-ON
Rating: 6A, 250 VAC
Insulation resistance: 500 VDC, 100 Mohms min.
Voltage breakdown:
1500 VAC (one minute)
Contact resistance: less than 20 Mohms max.