Tb6600 not supplying enough current

[Lionarcher]

Just recently got my last problem figured out (complete noobie mistake with linux cnc) and now I got this one. So my issue is that when I adjust the dip switches on my tb6600 drivers to adjust the current, well, it doesnt change. I hve tried every combination to change the current from the lowest setting (forgot what it was, I think one amp?) To the max (four?) But it never changes. Although I haven't measured it, partially cause I dont know how to on a stepper motor, I know it doesnt change first of all because at four amps the motors dont heat up at all (motors are rated for 2.8 amps) when I'd think they should be extremely hot at that current. The other reason I know it doesnt change is because I can't get the speed to go any faster on my cnc. While my system does move, it only moves at about 1 inch per second, and even then it doesnt take much force to stop it. I hope someone knows how to fix or help this issue! Got any suggestions?

Thanks in advance!

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[Jim Dawson]

What voltage are you running the drivers at?

[Lionarcher]

What voltage are you running the drivers at?

Oh wow, totally forgot that, sorry! But I am running them at 24 volts from a 25 amp power supply. Also, if it makes a difference, I am using 270 oz in nema 23 motors.

[Jim Dawson]

36V would be much better, but try setting the microsteps to 400

[Lionarcher]

36V would be much better, but try setting the microsteps to 400

Just out of curiosity, how would the higher voltage help up the current? And what do you mean by setting the micro steps to 400?

[Jim Dawson]

The higher the voltage, the more current that can flow, helps a lot with speed. In general, you want to run steppers at near the maximum voltage that the driver will take, in this case 40V. So the nearest power supply commonly available is 36V.

Steps per revolution. SW1 = ON, SW2 = OFF, SW3 = ON

[Lionarcher]

The higher the voltage, the more current that can flow, helps a lot with speed. In general, you want to run steppers at near the maximum voltage that the driver will take, in this case 40V. So the nearest power supply commonly available is 36V.

Steps per revolution. SW1 = ON, SW2 = OFF, SW3 = ON

Oh, okay, that makes sense, thanks! And oky, I'll try that tomorrow, hopefully it helps.

[Jim Dawson]

Just so I am sure about your drivers, is this the one you have? https://www.amazon.com/Updated-versi.../dp/B01CWMR1JG

[Lionarcher]

Just so I am sure about your drivers, is this the one you have? https://www.amazon.com/Updated-versi.../dp/B01CWMR1JG

That is correct, that is the same driver I have.

[Lionarcher]

After trying to lower the micro stepping to come out to 400 steps per inch, there is still no change. Mac speed is still 1.5 inches per second. Is there any way to be certain that upgrading the power supply to 36 volts will allow the drivers to output the proper current?

[Jim Dawson]

What is your leadscrew lead? What control software are you using? 4 wire or 6 wire stepper motors?

[Lionarcher]

What is your leadscrew lead? What control software are you using? 4 wire or 6 wire stepper motors?

Let's see, five rotations per inch, and I am using linuxcnc. As far as steppers go, I am using 4 wire motors.

[Jim Dawson]

OK, that all sounds good. Have you set your steps / inch in the software? You might also double check you motor wiring and confirm the voltage output from the power supply while running the motors.

[Lionarcher]

OK, that all sounds good. Have you set your steps / inch in the software? You might also double check you motor wiring and confirm the voltage output from the power supply while running the motors.

Yes I did, steps per inch has been set as well as the motor wiring and voltage are all correct.

[Jim Dawson]

Are you just trying to jog the motors? What is the jog speed set at in the software?

[Lionarcher]

Are you just trying to jog the motors? What is the jog speed set at in the software?

Yes, currently just jogging the motors. It is set at 1.5 inches per second, and even then it takes very little force to stop the gantry from moving. Also, I can stop the 3/4 inch lead screws quite easily (easier then I would expect anyway) with my hand, considering the torque the motors are supposed to put out, this doesnt seem right.

[Jim Dawson]

This makes no sense, you should not be able to stop the leadscrew with your hand. Please post a link to the motors that you have

[Lionarcher]

I know, thats what I thought. Here is the link to the motors:

https://www.ebay.com/itm/Zyltech-Nem...72.m2749.l2649

[Jim Dawson]

Read through this thread https://www.cnczone.com/forums/stepp...gineering.html

Your real problem is the driver rated voltage is too low for the motor. You should be up around 70-80 volts for that motor, but your driver won't allow that much without letting the magic smoke out.

[Lionarcher]

Read through this thread https://www.cnczone.com/forums/stepp...gineering.html

Your real problem is the driver rated voltage is too low for the motor. You should be up around 70-80 volts for that motor, but your driver won't allow that much without letting the magic smoke out.

Oh wow, that's my problem? Well, thanks! Any suggestions for any nema 23 motors that could hopefully work with the 24 volt power supply I already have? Or with a power supply upgrade? Or any other suggestions? Wanna get this machine going but dont have too much more money for it.... what would be your suggestion?