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XICOY LGC 13C User Manual page 7

Electric landing gear controller and sequencer

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It is possible to define 3 different positions for each output:
Gear Up position: The position you wish that the servo be driven when the gear is
retracted. Typically is a closed door.
Gear Down position: The position you wish that the servo be driven when the gear is
extended. Depending on model type, could be a opened or closed door.
Motor ON position: The position of the doors when the retracts are moving, typically
open.
The setup of the position in each phase is easily done by the help of the steering input
channel. In the case you don't use this channel on your installation you should
temporarily connect a RC signal from the rx or from a servo tester in order to operate
the servos manually to the desired position.
It is recommended to connect only the servo being adjusted to avoid the other servos
to move uncontrolled during the setup.
First screen is the "Servo 1 Gear Up position". When this screen is displayed, the
servo1 OUT will deliver the same signal as arriving to the Steering input, so that you
can move the servo directly trough the rudder stick on your TX. Set the servo at the
position you want that it to be when the gear is retracted, and press the "+" button. The
current position will be stored in the permanent memory of the controller. In the case
you don't want to modify this position to keep the old stored value, simply change of
screen by the menu buttons, the settings are only changed on the permanent memory
when the "+" button is pressed.
Next screen is the "Servo 1 Gear Down position". Operate the servo trough the TX to
the position you want that it to be when the gear is extended, and press the "+" button.
The position could be the same as the "gear up" position if you want a CLOSED-
OPENED-CLOSED sequence.
Last screen is the "Servo 1 Motor On position". Again, operate the servo trough the TX
to the position you want that it to be when the gear is in movement, and press the "+"
button to store the setting. Usually is the same position as the "gear down" position in
the OPENED-CLOSED sequence, but also it allow programming an over travel, the
door opens more during gear operation to give extra clearance to the wheel and legs,
but return to "scale" position when the gear is fully extended.
Servo 2 and Servo 3 are programmed same way.
Last screen is the "Servo switch off time:" To prevent the possibility of a servo to be
overloaded and burned due at being jammed, a protection function is added that allow
to release the servo force after some seconds (programmable by this parameter).
After the movement of retracts is finished, the servo signal is switched off, that cause
the servo to act as "unpowered". The servo position is refreshed each 15 seconds to
compensate the small movement of the servo (if any) during these 15s to keep the
door in to commanded position, assuming that there is not a considerable force acting
on the servo during the switch off period. In the case you want that the servo be active
all the time, set this parameter to zero.
Correct operation of this feature implies a servo that become "soft" when no signal
received. All analog servos act like this, but some digital servos hold the position when
no signal is received. If you plan to use digital servos on the doors and to use the

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