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TMC2100 driving dual Z - thermal shutdown? (4 replies)

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I have a Tevo Tarantula-style printer with dual Z (two identical motors connected to a single TMC2100 in parallel) with MKS Gen 1.4 board.

With Vref set to 1.2V, making RMS 1.2V*0.7A/V = 0.84A, which does not seem excessive.

Symptom: about 20-30 minutes into the print, Z axis stops moving. It's pretty easy to rotate by hand, you can feel the steps, but not much resistance.

Hypothesis: thermal shutdown?

Head scratchers:
1. Cancel the print, then immediately go to Control and move Z axis, it moves as if nothing was happening!
2. I run X and Y closer to 1.4V, and their motors get to 45C with no ill effects. Z motors are barely 28C (but there are two in parallel, remember!)
3. Measuring temperature optically through the cooling fins reports ~27C on Z driver, 28-29C on X and Y. Does not look anywhere close to panic levels.

Any ideas?

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