This is the most common point of failure.
| Issue | Likely Cause | Solution | | :--- | :--- | :--- | | | Driver not installed or IRQ conflict. | Move card to a different PCI slot. Reinstall drivers in Safe Mode. | | Machine moves wrong direction | Active Low/High setting. | In System Parameters -> I/O, toggle the "Dir Active Level" for that axis. | | Rough 3D finish | Acceleration/Velocity too high. | Reduce the "Max Acc" (Acceleration) in axis parameters. Increase "Filter" time. | | Spindle won't start | Frequency/MHz mismatch. | Check the PWM frequency settings match your VFD requirements. | weihong cnc adaptor pcimc 3d driver work