[taalabash]

Hello everybody
I am making four stepper drivers using the l297 /l298 circuit as shown in the schematic attached
The problem is that after i soldered two board and tried them the stepper doesn't spin it just vibrate

I tryed to make the stepper move slowly to find that the stepper is vibrating back and forth
I tried to change stepper wiring but no chance

One of the drivers worked when i adjusted the potentiometer on just on place and the stepper starts to vibrate again on higher speeds

So please help me fix this problem

[H500]

5v is far too low for a stepper motor. That's why you can't go fast.

[taalabash]

Thank you H500 for your reply
I am using 5v (vcc) to power the l297 and 12v (vss) to power the stepper

[taalabash]

Hello again
I found something i think it will be helpful to solve my problem

I am using arduino to test my driver and i tried to make the step pin go on and off every 1/2 second, iknow it is too slow but i did that to see how the two leds on motor terminal will act

And i found that the led on terminals 3 and 4 is going on and off regularly but the other led doesn't turn on at all

Si now i know that my driver isn't driving thd two stepper coils the same

I checked the connectivity between all pins on the pcb and all are as it should be like the schematic

I hope anybody can help me

[H500]

You probably damaged one of the leds by putting negative 12v into it. I believe the typical reverse volt rating is around 5v.

Is your power supply capable of supplying the amps?

[taalabash]

I am using atx power supply
And my stepper needs 0.4 amp in each coil

Today i tried to make a breadboard circuit using l297 and fou darlingtons as a unipolar stepper driver ( my stepper is unipolar)
The stepper works good with no vibration
I used accelstepper library to control my stepper
I foud that the stepper can run on 900 steps per second without vibration and with faster speed it will start to vibrate a lot

Is that normal?? Does steppers has max speed??

I am using a steppet called 42bygh801
http://www.wantmotor.com/ProductsView.asp?id=156&pid=80

And thank you again for your help

[lonewolf55]

Classic RepRap I see,
did you make the PCB your self ?

Stepper Motor Driver 1.2 - RepRapWiki

same Circuit, but they are using the 12 volts and the 5 volts from the ATX supply

H500 might be right about the Led

[taalabash]

You are right lonewolf55
I took the schematic from 1.2 driver and modify it a little bit to make it suitable to my electronics

[lonewolf55]

the Voltage on that stepper motor is 12 Volt ... I use steppers rated down to like 3 volts or less if I want to run them with 12 Volts


see this ===>>> NEMA 17 Stepper motor - RepRapWiki

notice the Low Voltage ratings

[taalabash]

I see that most steppers on the reprap page are below 12 volts or even below 6 volts
So should i use a higher voltage? And what is that higher voltage you suggest?? And does the higher voltage increase torque or speed??

[lonewolf55]

the Max voltage to use on that motor assuming the Square Root of the Inductance times 32 = 169 Volts

well, you ain't gonna get there with what your driver is rated at, and that would be a MAX voltage, you might get that motor to run with 24 volts but it will not run fast.

you really need to read this post ===>>> http://www.cnczone.com/forums/steppe...48947-cnc.html

I don't think your stepper motor is right for what you are trying to drive it with.
Have you studied the Data Sheets for these 2 IC's that you are using ?
PCB layout seem Critical on that L298 also.

One more thing, here is a stepper motor Calculator you can play with so see what different voltages will do ===>>> Stepper Motor Calculator

[taalabash]

I bought this stepper because i thought it have the right rated voltage and because this are the only steppers i can find in my country with an acceptable price
i readed the datasheets of both l297 l298 chips but actually i didn't anderstoud current controlling in l297 datasheet
And my driver didn't worked.. Maybe it's because i changed all the layout on the board especially the grounds maybe (i didn't used star ground method)

But i can change the whole driver idea if you suggest another design even if it uses other chips

[daniellyall]

if you have it connected like the schematic it should work what is you program post that there are some what don't work to well with the L298N forget about the L297 if you are using a L298 on a schematic for a L297 it wont work to well

https://www.sparkfun.com/datasheets/...eral/L298N.pdf

[lonewolf55]

Figure 9 : Suggested Printed Circuit Board Layout for the Circuit of fig. 8 (1:1 scale). on Page 9
http://www.st.com/web/en/resource/te...CD00000240.pdf

I do not know how you laid out your board, but according to what I read in the Data Sheet it is somewhat critical due to Noise issues.

and if you insist on using that motor, you will need to increase the supply voltage, the Max Voltage the Driver can handle is 46 volts

[lonewolf55]

I bought this stepper because i thought it have the right rated voltage and because this are the only steppers i can find in my country with an acceptable price
i readed the datasheets of both l297 l298 chips but actually i didn't anderstoud current controlling in l297 datasheet
And my driver didn't worked.. Maybe it's because i changed all the layout on the board especially the grounds maybe (i didn't used star ground method)

But i can change the whole driver idea if you suggest another design even if it uses other chips

you might want to read this Post ===>> http://www.cnczone.com/forums/showth...based%20driver

[taalabash]

Ok thank you lonewolf55 you helped me alot
I have another question maybe it is off-topic
What about using a circuit like the attached one i tried it on breadboard and it worked good without noise problems and it can handle more voltage
But it doesn't control current
So what about adding current limiting resistors on the common stepper lines that are connected to 12 v??
Will it work with higher voltage without damaging the stepper?

[daniellyall]

are you useing a l297 or a l298

[taalabash]

Daniellyall i am using both l297 (translator) and l298 ( double H bridge) i cant use only l298 to control a stepper without a translator chip

[lonewolf55]

current limiting resistor in series with each winding is what I would do to control the current, but seems like going backwards from where you started..

First off what are you trying to use this for ???

[taalabash]

I am trying to make a 3d printer but the problem is that i can't find pololu driver or any Allegro based drivers or even any allegro chips to build a driver
So i desided to use l297/l298 because i can found theme both and because it's easy to make a pcb that can handle them in home
And again i cant find many steppers with an acceptable price ( not necessarily cheap)