Stepper Driver Issue

[soft zephyr]

What sense current resistor value are you running at? Also what do you mean by the motors are getting hot? They will almost always be hot to the touch, but that just means they are at least 45-50c, which is a fine temperature for them to be running at

[sinful vector]

I found that if using the VREF calculation, a LDO-42STH48-2504AC being driven by a 5160 driver at 48v should be set to a current of .91 in Klipper. Others have also said that setting your microstepping at 64 when using 48v, which is default in RatOS, can cause a lot of heat. Microstepping should be 16 or less at 48v.

As for the sense current resistor value, RatOS 2.1 does not put that in when you select the 5160. It does add it if you select the 2209. At the moment, there is no value entered.

[tidal rampart]

@weary hare

[weary hare]

I found that if using the VREF calculation, a LDO-42STH48-2504AC being driven by a 5160 driver at 48v should be set to a current of .91 in Klipper. Others have also said that setting your microstepping at 64 when using 48v, which is default in RatOS, can cause a lot of heat. Microstepping should be 16 or less at 48v.

... uhm what?

Microstepping has nothing to do with voltage. What are you talking about with "VREF calculation"?

Why are you using 0.022 ohm sense resistor drivers ?

[weary hare]

As for the sense current resistor value, RatOS 2.1 does not put that in when you select the 5160.
Yeah you kinda need to select the specific driver model you're using, 0.022 is NOT the default. 0.075 is (which is a much better value for the 2504's), these external drivers are made for 7.5A+ RMS. Nema36 to 42's.. Those things are not meant to run such tiny steppers.

[weary hare]

when claiming something doesn't work as advertised, please provide a debug-zip