I’m installing a Jackpot board in my MPCNC. I’m using 5 TMC2209 v3.
I noticed that in the config.yalm we need to specify the current for the steppers:
run_amps: 0.680
hold_amps: 0.500
This means that we don’t have to adjust the current int ht e TMC2209 ?
Is it controlled by the software in this drivers?
Thats correct.
Thats great!
So the Vref came set from the factory and I only need to change it on the config? I wonder why they sent 5 cables and 5 screw drivers with the TMC2209 then.
They do sound and feel much better than my old RAMPS and A4988s. And beeing able the set the current in the config is another great feature!
Most TMC2209 stepstick drivers have a pot on them, but it only gets used by the TMC2209 if software doesn’t configure it over UART. That lets them be a semi- drop in replacement for the older stepstick drivers.
For the way that we use this in the Jackpot or SKR Pro 1.2, the firmware sets up the current along with other driver settings. There is no need to adjust the pot for this application, and changing the settings can be done using a config file (Jackpot/FluidNC) or firmware/M- Gcodes (SKR/Marlin)
The TMC2209 can be tuned by the screw. There are super tiny solder pads on the bottom that determine if the tmc2209 is in “standalone” mode or “uart” mode. In standalone, the potentiometer controls current. In uart mode, the software does, and a few other things. If you’re using a jackpot, you want to make sure you buy tmc2209s in uart mode, or you have some work to reconfigure them (or return them for the right ones).
1 Like