Safety first: Use the E-stop, unplug spindle/machine power before touching tools, switches or couplers, and keep hands out of axis travel. Never bypass a hard-limit switch to run a cutting job; do not loosen a powered spindle or jog an axis into its physical end.
Model and version covered
Genmitsu 3018-PROVer V2 with GRBL-compatible controller. Check board marking and firmware before applying GRBL commands; the older 3018-PROVer and V2 Lite do not necessarily have identical connectors.
Version check: Confirm controller, GRBL firmware and actual limit/probe connections before changing parameters or running automated motion.
DIAGNOSE THE CAUSE · APPLY THE FIX · CONFIRM THE RESULT
Find the cause and fix it
Jump to your symptom: 01 · Home hits frame before switch triggers02 · All switches look connected but homing direction wrong03 · Switch LED stuck active without contact
01
Home hits frame before switch triggers
HOW TO CHECK & CORRECT THIS CAUSE
- Power off.
- Inspect switch brackets, contact levers, X/Y/Z wiring, couplers and carriage movement.
- Align mechanical actuators according to V2 diagram so switches trigger before physical collision.
How to tell it is fixed: Homing finishes without frame impact.
02
All switches look connected but homing direction wrong
HOW TO CHECK & CORRECT THIS CAUSE
- Restore V2-provided GRBL settings/firmware matching limit-switch option.
- Do not flash an unrelated no-switch binary or copy `$23` from a different router.
How to tell it is fixed: Axes travel toward proper limit at safe short distance.
03
Switch LED stuck active without contact
HOW TO CHECK & CORRECT THIS CAUSE
- Clean/repair bent lever or shorted switch cable and replace defective switch with correct normally configured part.
How to tell it is fixed: State changes correctly as switch actuates/release before running full homing.
Source and model restrictions
Technical baseline: Manufacturer guide or model manual ↗