8
Aux Switch Options
1.) Using a dedicated “Trim Tab Switch”:
Connect terminal 3 to an existing or newly installed switch which is convenient to the helmsman to turn the “Oval”
on for use, and off at trip’s end for full tab retraction and tab position indicator synchronization at tabs up.
2.) Using a conventional multifunction key or rotary switch for “OFF-AUX-IGN-START”
with gasoline engine powered boats:
Connect Terminal 3 to the AUX position of this type switch. DO NOT use the ignition (IGN) position. Whenever
the AUX position is turned on or off the “Oval” will respond accordingly. DO NOT use this type switch if it does
not have an “AUX” position.
3.) Using a conventional multifunction key or rotary switch for “OFF-GAUGES
PREHEAT” with diesel engine powered boats:
Connect terminal 3 to the gauges position of this type switch. Whenever the gauges position is turned on or off, the
“Oval” will respond accordingly. DO NOT use the (GAUGES) position if turning off the gauges also stops the
engine.
4.) Using the “Electronics Master Switch”:
On many boats, at the helm area, there will be a master switch for the navigation and other electronic equipment
which provides a convenient way to turn all of this equipment on and off at the beginning and end of a trip. Connect
Terminal 3 to this switch which, when turned off, will initiate the 10 second calibration sequence to synchronize the
tabs and indicators, at full retract.
5.) Using a "Gearshift Neutral Switch”:
As noted on page 3, deenergizing the “Oval’s” terminal 3 will initiate a 10 second calibration sequence in order to
synchronize the tabs and the indicators at full retract, ready for use. If Terminal 3 remains deenergized, the “Oval”
will remain shut down. Alternatively, if Terminal 3 is deenergized and immediately reenergized, the “Oval” will
initiate a calibration / retract sequence but will remain on. This feature will accommodate connecting Terminal 3 to
a gearshift switch which is *OPEN CIRCUIT in neutral. In this case, after the engine is started and put in gear,
Terminal 3 would be energized, readying the “Oval” for use. Then, at the end of the trip, or when backing down,
when the gearshift is returned to neutral, or even passed through neutral to reverse, the “Oval” would initiate a
calibration / retract sequence and the tabs will remain retracted, regardless of subsequent gearshift positions until, on
the next trip out, the helmsman operates the control for tabs down. This scheme will provide tab retraction upon
reaching the docking area instead of remaining down during the docking process waiting to be retracted when the
engine is shutdown.
Of all the ways to have the tabs retract at trips end, we like the gearshift neutral approach the best.
* If the neutral switch is not off at neutral, you can use a Lectrotab
model # NR-12 or NR-24 relay assembly to convert a hot neutral
switch to an open circuit output for use with the oval. The installation
and the wiring are quite simple.
LECTROTAB ● Linear Devices Corporation ● 11126 Air Park Rd., Suite G ● Ashland, VA 23005 Phone: 804-368-8428, Fax: 804-368-8438,
www.lectrotab.com
Lit # J1107
Revised January 2014
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