B&G Vulcan Series, Installation Manual

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Power Control unconnected
Device will turn on and off when the power button on the front of
the unit is pressed. Leave the yellow Power Control wire
disconnected and tape or heat-shrink the end to prevent shorting.
Power Control to supply positive (auto on)
Device will turn on immediately when power is applied. Common
the yellow wire with the red wire after the fuse.
Ú
Note:
The unit cannot be powered down by power button,
but can be put in to standby mode. (The screen backlight
turns off.)
Power Control to ignition
Device will turn on once ignition is turned on to start engines.
Connect the yellow wire to the accessories output of the engine key
switch.
Ú
Note:
Engine start batteries and house batteries should
have a common ground connection.
External alarm
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Note:
An external alarm can be connected to the Vulcan 7
FS only.
The external alarm can be a small piezo buzzer connected directly,
or a horn siren connected through a relay.
Alarms are configured globally in the system. That is, they can be
configured on any one networked multifunction device or
instrument, and be seen, heard, and acknowledged from all devices.
Individual devices can also be configured to not sound their internal
buzzer, but still display the alarm information. For information about
configuring alarms, refer to the Alarms section in the Operator
Manual.
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Wiring | Vulcan Series Installation Manual