Lit # 4H06
Revised 8/18/2006
3
Oval Wiring
Wiring the Oval control begins by connecting it to the standard four conductor Lectrotab interconnect cable, OR by connecting
directly to the individual actuator wires, if the actuators have been supplied with long wires. With the Oval, no interface module is
used. See the mechanical portion of the Lectrotab installation manual through the top of page 7. Instead of wiring to the manual
switches as shown, connect directly to the back of the Oval using ¼” female push-on connectors. Seven connections are made to the
seven connection points on the Oval as shown below. One additional
connection is the communications cable if multiple stations are
used.
Point 1
(+ D.C. Main Power)
From the vessel’s D.C. power panel, protected by a 20 amp fuse or circuit breaker, supply this point with 12 or 24 VDC + (positive)
power using AWG 14 wire or larger. Confirm that the tab actuators match the input voltage. Actuator Model numbers starting with A
or C are 12 VDC; model numbers starting with B or D are 24 VDC.
Point 2
(- D.C. Power)
Connect this point, using AWG 14 wire or larger, to the vessel’s – (negative) ground.
Point 3
(Auxiliary or engine gauge or ignition switch. See page 6 for more options.)
While the main D.C. trim tab system power remains on, ap power to this point will activate the Oval. Denergizing the point
will deactivate the Oval, leaving a 6 MA standby current flow. Provide power to this point with a dedicated switch marked “Trim
Tabs” or use the engine gauge switch. The reason for controlling the Oval trim tab system from point 3 is as follows: energizing
point 3 will “wake up” the Oval control and initiate a pre-trip trim tab retraction, whether the tabs are already up or not, and set the tab
position indicators to the retracted indication. This process calibrates, or synchronizes, the tabs with the indicators to maintain
indicator accuracy. Denergizing point 3 will initiate the same process, so as to retract and recalibrate the tabs at trip’s end. The Oval
will then shut down and draw a standby current of 6 MA.
IMPORTANT
Point 3 must be powered for the Oval to operate. Using a jumper will
bypass the retract feature and the programming features of the Oval.
Point 4 and 5
(Port Actuator)
Connect the port tab actuator black wire, or the Lectrotab interconnect cable black wire, to point 4.
Connect the tab actuator white wire, or the Lectrotab interconnect cable red wire to point 5.
Point 6 and 7
(Starboard Actuator)
