And no one explains why * 0.71 and why * 2... If anyone is interested: ассording to datasheet I_rms = (325mV / (R_sense + 20mOm)) * (1 / sqrt(2)) * (V_ref/2.5V). Board from video has R110 (110mOm) R_sense resistors. I_rms = (325 / (110 + 20)) * (1 / sqrt(2)) * (V_ref / 2.5), I_rms = 0.7071 * V_ref, so maximum V_ref = I_rms / 0.7071 for this board. And for example if we need a RMS current limit of 1A , then V_ref = 1.0 / 0.7071 = 1.414V
Thank you for the video. But I still need help if you may... I have a 3D printer which is of 24V and I want to replace my Nema 17 48mm (1.5A) with Nema 17 60mm (2.3A) by using TMC2209. I have purchased TMC2209 v4.0 (XinDongWang brand) from AE, is the vref formula still same for this item? Should I use 2.3*1.41=3.24? Do you think using %10 less ampere value (i.e., about 2.10) of the stepper motor would be safer? Thank you very much.
17hs4401s has a maximum operating current of 1.7 amperes, so according to the calculation formula 1.7*0.71*2= Vref is 2.4 volts. in most cases, the maximum performances given by the manufacturers are fanciful, so you should use the stepper at a current lower than 1.7 amperes, so depending on the use, for example with a 3d printer, you can use it at 0.8 amperes. it is best to increase the amperage gradually and check how much the stepper heats up. don't forget to use a cooling fan on the driver's radiator. regarding the microstepping, the same formula and the heating check apply
I'm sorry for destroying the drivers, but if you haven't connected any stepper motor or logic power, the driver shouldn't burn. At power-up the motor supply voltage VM should come up first and then the logic supply voltage VIO. On power-down the logic supply voltage VIO should turned off at first and then the motor supply voltage VM, because the internal logic of the TMCxxxx driver is powered from VM.
And no one explains why * 0.71 and why * 2... If anyone is interested: ассording to datasheet I_rms = (325mV / (R_sense + 20mOm)) * (1 / sqrt(2)) * (V_ref/2.5V). Board from video has R110 (110mOm) R_sense resistors. I_rms = (325 / (110 + 20)) * (1 / sqrt(2)) * (V_ref / 2.5), I_rms = 0.7071 * V_ref, so maximum V_ref = I_rms / 0.7071 for this board. And for example if we need a RMS current limit of 1A , then V_ref = 1.0 / 0.7071 = 1.414V
Thank you for the video. But I still need help if you may... I have a 3D printer which is of 24V and I want to replace my Nema 17 48mm (1.5A) with Nema 17 60mm (2.3A) by using TMC2209. I have purchased TMC2209 v4.0 (XinDongWang brand) from AE, is the vref formula still same for this item? Should I use 2.3*1.41=3.24? Do you think using %10 less ampere value (i.e., about 2.10) of the stepper motor would be safer? Thank you very much.
Okay, the formula is VREF=Current×1.41, for my case it is VREF=2.3×1.41=3.24 and with %10 safety margin it is VREF=2.3×1.41×0.90=2.92
"clockwise' or 'counter clockwise' are the same for whichever way you view the potentiometer (unless from below).
Yea that made no sense lol
Hello. What is the VREF setting for 17HS4401S Nema Motor and 1/8 stepper stepper of Tmc2209 stepper motor driver board? Thank you.
17hs4401s has a maximum operating current of 1.7 amperes, so according to the calculation formula 1.7*0.71*2= Vref is 2.4 volts. in most cases, the maximum performances given by the manufacturers are fanciful, so you should use the stepper at a current lower than 1.7 amperes, so depending on the use, for example with a 3d printer, you can use it at 0.8 amperes. it is best to increase the amperage gradually and check how much the stepper heats up. don't forget to use a cooling fan on the driver's radiator.
regarding the microstepping, the same formula and the heating check apply
@@CNCEVOLUTION Thank you for your answer
Nice video,informativ my friend!!!!
can you make a video on how to wire the entire driver? ive followed every tutorial, read documentation, i cant get this to work for the life of me
Which printer?
i thought those drivers has auto current control feature ,!!?
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I burned two tmc2209 :), the power supply was set to 0.5A and yet it burned immediately. I did as in your video.😢
I'm sorry for destroying the drivers, but if you haven't connected any stepper motor or logic power, the driver shouldn't burn.
At power-up the motor supply voltage VM should come up first and then the logic supply voltage VIO. On power-down the logic supply voltage VIO should turned off at first and then the motor supply voltage VM, because the internal logic of the TMCxxxx driver is powered from VM.