Problems Driving my Stepper Motor

[jordanr18]

Hey all,

I'm having some problems driving my stepper motor. It runs clockwise at an eighth step just fine but it doesn't run counter clockwise or at any other step size. I've looked at all the datasheets I can find and I believe I have it programmed correctly. I'm using a NI USB 6009 OEM board to connect to my PC, an Anaheim Automation MBC25081TB step driver, and a generic stepper motor with specs: 18 deg/step, 4-5VDC, and 0.5 A current rating and is 2-phase 4 wire bipolar. I'm sending signals to the driver using a digital waveform and the digital outputs of NI USB 6009 OEM board. I've attached my code to this post, please let me know if you have any ideas.

Thanks in advance.

[JÞB]

1chNsample ain't gonna fly

the 6009 is software timed only.  It has no buffer to store multiple points.  it outputs 1 sample and holds that until it sees another write.

[ben64]

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@jordanr18 wrote:

Hey all,

I'm having some problems driving my stepper motor. It runs clockwise at an eighth step just fine but it doesn't run counter clockwise or at any other step size. I've looked at all the datasheets I can find and I believe I have it programmed correctly. I'm using a NI USB 6009 OEM board to connect to my PC, an Anaheim Automation MBC25081TB step driver, and a generic stepper motor with specs: 18 deg/step, 4-5VDC, and 0.5 A current rating and is 2-phase 4 wire bipolar. I'm sending signals to the driver using a digital waveform and the digital outputs of NI USB 6009 OEM board. I've attached my code to this post, please let me know if you have any ideas.

Thanks in advance.

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That definitely sounds like a configuration issue. We don't know how you set jumper 1 (JP1) , position 1-2 (sourcing) or 2-3 (sinking). If set to sinking the inputs need to be pulled to 3.5-24V DC to be considered active. If your USB-6009 is configured to active drive then the maximum output voltage is 3.3V. You will then always be in eighth steps mode and in the same default direction.

Refer to this link for the output configuration.

Ben64

Ben64

[jordanr18]

I have the driver set in JP1 position 1-2 which according to my datasheet is sinking. As to the USB 6009, I am not sure if it is active or not, is there a way I can check that? I am very new to labview so I don't know a whole lot

[ben64]

Do as specified in the link I posted, drop a DAQmx Channel property node on your block diagram and select the Digital Output drive type property. You can select to read or write the property value by right clicking on it. Reading the property will tell you the actual setting.

Ben64

[jordanr18]

So I followed the link, turns out my USB 6009 is configured to an Open Collector at the moment, do I need to change it to an Active Drive?

Thanks for your help Ben64

[jordanr18]

i just tried running it as a 1CH 1sample and it doesn't move at all now

[jordanr18]

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@ben64 wrote:

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@jordanr18 wrote:

Hey all,

I'm having some problems driving my stepper motor. It runs clockwise at an eighth step just fine but it doesn't run counter clockwise or at any other step size. I've looked at all the datasheets I can find and I believe I have it programmed correctly. I'm using a NI USB 6009 OEM board to connect to my PC, an Anaheim Automation MBC25081TB step driver, and a generic stepper motor with specs: 18 deg/step, 4-5VDC, and 0.5 A current rating and is 2-phase 4 wire bipolar. I'm sending signals to the driver using a digital waveform and the digital outputs of NI USB 6009 OEM board. I've attached my code to this post, please let me know if you have any ideas.

Thanks in advance.

---

That definitely sounds like a configuration issue. We don't know how you set jumper 1 (JP1) , position 1-2 (sourcing) or 2-3 (sinking). If set to sinking the inputs need to be pulled to 3.5-24V DC to be considered active. If your USB-6009 is configured to active drive then the maximum output voltage is 3.3V. You will then always be in eighth steps mode and in the same default direction.

Refer to this link for the output configuration.

Ben64

Ben64

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So what you're saying is that even with my USB 6009 configured as an Active Drive, I'll still be able to only move in 1/8 steps and only in one direction? I wouldn't be able to move both clockwise and counter-clockwise?

[JÞB]

Try this mod

that 6009 cannot use multiple samples it is on demand only (Where have I said it before)  Hence you get 1 step and keep repeating the same point.  To be honest unless you have some screwwy data (which you did not attach) you probably should be getting a DAQmx error

[jordanr18]

Sorry, I should have had the correct default values set, here is my updated VI with your mod. I am just trying to have the motor go a couple of eighth steps clockwise, and then counter clockwise.

Edit: the lines in the digital data refer to MS1, MS2, On/Off, Clock and Direction inputs on the MBC25081TB driver. I have Direction connected to P0.0, Clock to P0.1, On/Off to P0.2, MS2 to P0.3, and MS1 toP0.4