[atair]

**edit**
ok - i was out of this too long and mixed up current and voltage..
now - if the voltage stays the same throughout the board (eg 24v) - i thought the motor can always only take the amps (= current, right?) that it needs/wants - so how can a jumper on the tb6560 set this to 50%? (how the board knows what the motor wants?)
If so - the motor is rated with 2.7v and an inductance of 4.3 mH per coil - this nice formula (32 * sqrt(4.3)) gives me 66 volts? can this be right?
Still the question remains - is the setup ok with 50% current (how does this work?) and 24v from the power supply? why it gets so very hot?
**edit**

hi
i have a TB6560 - and after implementing some of the tweaks - it runs fine for now.
i have 3 nema 23 steppers, which ran also fine with it, but now i got smaller nema 14 steppers (they are really tiny) and now my question is the voltage - i can throttle the power supply down to 24v, and set the current jumpers to 50%, where i should end up with 12v - right?

now the nema 14 steppers are rated 2,7v - and as far as i understood, i can go up to 10x the rated current, which would then be some 30v?

still the motors get too hot to touch after some minutes (with 12v - as far as i can trust the tb6560 jumpers).
(with 25% they are fine, but too weak)

my question is - am i missing something (ohm etc?), is my setup ok - or should i get a small fire extinguisher?

[H500]

The motor voltage is unimportant. What matters is the rated current.

The max coil current is set using the resistors on pins 11 and 14.

current = .5/R