FA-93527 / Solar tracker geometry / Member archive

Tracker actuator step command: slew limit direction · case 02

Large eastward corrections are executed in one jump.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Angles in millidegrees. The target is clamped to [lo, hi]. If |target - current| < deadband no move is made. Otherwise the move is limited to +-max_step, converted to whole motor steps of dps millidegrees truncated toward zero. Return [new position, signed steps].

Why this case matters

Single-axis and dual-axis solar trackers turn a sun direction into actuator commands; a sign, frame or limit mistake points a whole plant away from the sun or into a mechanical stop.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
normal: negative move truncation	`[-9900, -33]`	`[-1800, -6]`	Failed

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