Setting VREF

Set Vref for TMC2209 — Dune Weaver Table

A quick, safe procedure to set motor current on DW tables.

TL;DR

• Set Vref to 0.60 V.
• Only raise if confirmed step loss after mechanical checks; max 0.70 V.
• Clip the red lead to the VREF pad; hold the black probe on GND. Adjust with a ceramic/plastic screwdriver while measuring.

What is Vref (in one line)?

"Vref is the driver's reference voltage that sets motor current: higher = more torque & heat; lower = cooler & quieter."

Safety

• Power down before attaching/removing the red clip.
• Use a small insulated alligator/mini‑grabber on the red lead to the VREF pad—make sure it touches only that pad.
• Hold the black probe on a solid GND point (PSU − or controller GND); keep a steady hand.
• Keep axes idle while measuring/adjusting.

Where to Probe

• Red lead (clip): vref adjustment screw. Use an alligator clip to clip to a screwdriver so you can measure and adjust simultaneously
• Black probe (hand‑held): any GND pad or PSU −.

Procedure

1. Power off. Clip red lead to VREF. Position the black probe on GND.
2. Power on. Keep the black probe on GND to read Vref.
3. Using a metal screwdriver, adjust while measuring (tiny turns: CW = up, CCW = down) to 0.60 V.
4. Power off. Remove the red clip; run a slow test pattern.

Tuning

• If you still get stalls/step loss: 0.65 V → test → 0.70 V (hard max).
• Too low: skips, chattering, weak hold.
• Too high: hot drivers/motors, harsh sound, thermal shutdown.

Before Raising Vref, Check

• Smooth mechanics (no binding); rails/bearings aligned.
• Belt tension, pulley grub‑screws on shaft flat.
• PSU voltage stable; connectors seated.

For further assistance, join their Discord community at https://discord.gg/YZ8PTezVHt.