Newbie- My SLA7062M Driver Photos

[AbuTarif]

I've finished building this stepper driver based on SLA7062 ,
The source was from PMinMO.com ,thanks to Phil ,
But actually it wont run my motor
Even when power it up the motor not clamp !!

Any body build this design before ??
http://www.pminmo.com/SLA7062/SLA7062.htm

[Alex2005]

I have built this circuit, actually the older one since it was about 3-4 years ago now and it works ok. I do get this hissing noise from the motors when they are holding still, but it works. Have you got the motors wired to your DC power supply and the circuit itself?

[AbuTarif]

Thanks Alex205 , yes I wired the motor common to the + of the power supply and the circuit itself , but still no hiss or vibration or any thing ,just the LED is ON .??

Actually I've build all of the known steppers circuit like LMD18245 ,AL3977 ,L297, .....
all work well except this !!!

[Alex2005]

Would you like if I take images of the circuit bottom and top and post here?

It does work well, I run at 40V I think, ages ago, just getting back into it. I can use at 3000rpm (little torque, slow acceleration, no stall. But 1500rpm nicely) on mach3.

Infact I have a 2x15V toroidal transformer wired series through bridge rectifier and 22,000uF cap so theorectically 42.3V.

I actually used package type sense resistors, very little inductance, and a quality bourns 10K POT set to 0.6 volts I think around 2.5-2.7 amps on a 3 amp motor winding.

Resistors were these model http://www.rapidonline.com/Electroni...s-TO-126/77297, but my supplier doesn't sell the 0.5 ohm anymore it seems.

let me know.

[AbuTarif]

This is my circuit top and bottom ,,,

[AbuTarif]

Thanks to Phil who help me to figure out the problem ,which was only a loose connection between the positive and Pin16 of SLA7062M ,

Now it works ,

[Alex2005]

Thats good.

Can you tell me, do you get a hissing noise from your motor when idle?

[RomanLini]

The hissing noise is caused by ultrasonics from the current chopping of the driver causing the motor windings to ring. It's quite normal. If you set the SLA chip to synchronous mode when idle the noise is less, the chip has a control pin for this purpose.

The noise is also fairly dependant on PSU voltage, it is very different with different PSU voltages.

[Drools]

Are there eagle sch and brd files available for this board?

[quadtech]

Eagle sch and brd are available here, albeit for a different board -

New SLA7062M 3 amp driver from Linistepper designer

[RomanLini]

Originally Posted by Drools Are there eagle sch and brd files available for this board?

Why not buy 3 SLAmStepper kits from James? The SLAm design solves many of the problems with other SLA chip designs including being much smaller and faster to build, designed for max reliability and it has excellent designed PCB with good attention to all the current paths etc designed by a SMPS designer (me!).

I've got 3 SLAms on my CNC machine with a 33v PSU and they give a very pro level of performance.

[Drools]

I have been looking at this driver, I have some unknown bipolar steppers STP-57D301that I'm thinking about using on a new 12x12 router. The unipolar steppers I have are not suited to the Linstepper so either I look for another unipolar driver or a bipolar driver. My unipolar steppers are 6 wire type and they might run in bipolar mode. I can do my own PCBs without a problem. Thanks for the help Roman!