One or both actuators stalling or running into end stops
When the actuators clearly have power but appear to be moving incorrectly, this could signal one of several problems. It is important to distinguish between stalling and running into the end stops: Stalling indicates a power problem, and running into end stops indicates a position problem.
Stalling
Stalling will materialize as an actuator struggling while between the limits of its range of motion. When stalled, actuators will make a slightly different sound and won’t extend or retract.
Stalling while the TetraSki is stationary, particularly in denser snow with a heavier skier, is typically normal. Try moving the ski slightly forward/backward to ‘reset’ the edge positions and the problem will usually go away.
If the ski appears to be stalling excessively while stationary, and the skier is reporting poor turn response, the problem could be more extensive. Contact support for more help diagnosing the issue.
Running into end stops
Running into end stops looks a little different. The actuator will have plenty of power to move through its normal range of motion, but appear to ‘lose track’ of its position and slam into the limits of extension/retraction. This will be accompanied by obvious shaking/stuttering, and usually (but not always) a failure to return to a proper neutral position.
If the actuator is hitting either end stop, but the TetraSki is otherwise skiing correctly and consistently returning to a default neutral wedge when the joystick is released, it’s likely that the actuator position sensor has drifted in range slightly over time and the original calibration values are now slightly off.
Recalibrate the actuators: See Calibrate Actuators.
If there are issues calibrating, the ski is consistently hitting the end stops, turning is disrupted and/or the skis don’t return to a correct neutral position, further diagnosis is required.
(1) Begin by noting which actuator is having issues. Enter debug mode by rapidly pressing the power button five times.
(2) The value of interest on the debug screen is the LPos or RPos value (depending on left or right actuator).
(3) Use the joystick to move the actuator in and out (the speed is slowed down, be patient!) and note value of the ‘Pos’ variable. It should be lowest (~100-300) when the actuator is fully extended, and highest when fully retracted (~750-950). The important thing is that it’s changing as the actuator moves.
(4) Take note of this behavior and contact Tetradapt support for more assistance.