wiring 4V 4phase linear actuator with BS2

nickrummel

Hi All,

I just purchased a 4V 4ph 1.8A 1.8deg linear actuator LA23GCKB-1

link to wiring diagram - last page of pdf - (https://www.google.com/urlsa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CC8QFjAA&url=http%3A%2F%2Fwww.electrocraft.com%2Ffiles%2Fead_step.pdf&ei=sOrgUabUBKeEjALtnoGwCQ&usg=AFQjCNGSD0RzDolaq_Ad0PeeYEQhLZoREg&sig2=cQeGJFcQaF3cwC3PtKjFZg&bvm=bv.48705608,d.cGE)

Mine has 6 wires (red, red/white, green, green/white, black, and white). I wired it as: red = phase 1, red/white = phase 2, green = phase 3, and green/white = phase 4. Black and white not connected. I wired this according to the stepper motor example (#27) in the stampworks book, with the L293D driver, and used the the code from this example from parallax (http://www.parallax.com/Portals/0/Downloads/docs/prod/motors/Stepper_Motor_27964.pdf). When I run it, the motor has a very slight vibration, but the screw doesn't rotate. Any thoughts on how I can get this to work?

Note - I tried this same set-up with the parallax stepper motor and it worked.

Thanks,
Nick

nickrummel

update - I rewired it to red = phase 1, green = phase 2, red/white = phase 3, and green/white = phase 4 and it vibrates stronger than before, but still no screw rotation.

erco

Voltage? Maybe 12v instead of 5? Speed? Slow your pulserate down and see if it tracks.

But those unconnected wires are likely the problem. Got data sheet? Link no worky.

Publison

Here is a way to identify your leads:

http://www.stepperworld.com/Tutorials/pgBipolarTutorial.htm

This is also a good read:

http://en.wikipedia.org/wiki/Stepper_motor

nickrummel

Sorry, try this one.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&ved=0CC8QFjAA&url=http%3A%2F%2Fwww.electrocraft.com%2Ffiles%2Fead_step.pdf&ei=sOrgUabUBKeEjALtnoGwCQ&usg=AFQjCNGSD0RzDolaq_Ad0PeeYEQhLZoREg&sig2=cQeGJFcQaF3cwC3PtKjFZg&bvm=bv.48705608,d.cGE

Duane Degn

ULN2003 Can only handle 500mA (IIRC). Is that enough to drive this stepper?

I would be helpful to know what you're using for a power supply.

nickrummel

Is the L293D driver the same as the ULN2003? I see, that may be problem. I'm using a professional development board from parallax plugged into a 9V adapter.

Duane Degn

nickrummel wrote: »

Is the L293D driver the same as the ULN2003? I see, that may be problem. I'm using a professional development board from parallax plugged into a 9V adapter.

Sorry, I forgot you mentioned the L293D. I don't recall its current limit.

How many amps can your power supply provide? You may need a different controller for the motor.

nickrummel

The adapter is 10V 150mA

Publison

nickrummel wrote: »

The adapter is 10V 150mA

First off, you mentioned in your first post, the actuator requires 1.8 amps. A 150ma adapter will not supply enough power to turn the stepper.

Second, you need to connect a 2-3 amp power supply to the V+ an ground connection below the L293D chip.

Thirdly, the L293D is only good for 600ma per pin.

I have replaced the L293D on my boards with the SN754410NE.One amp per pin and inexpensive

Still don't know if it would handle your actuator.

nickrummel

Thanks for the clarification. I may try to get my hands on that driver. Is there a way to hook this up without a driver?

Duane Degn

These can drive with a bit more current and have all the flyback diodes on the board (plus they're cheap). Some discussion about them in this thread.

If you have some high power transistors, you could make a driver with them but getting a chip or board to drive the motor would be much easier.

There are also stepper drivers that just require a direction and pulse pin. SparkFun's EasyDriver is one such board but I don't know it would be powerful enough for this motor.