connecting NI 9512->P70530->stepper motor

[Tacchi]

Hello.

I have the following components:NI 9512->P70530->stepper motor. The NI 9512 is connected to cRIO-9074.

I started a new project as explained in the tutorial for NI 9512.

Then it says to install the driver (P70350) software. I did it.

As i understand, because of my motor is not from "Danaher" i cannot configure the P70530 with the switches but only with the software, so i need to connect it somehow directly to the PC?

How can I do it? Is it necessary? is there some other possibility to configure the P70530?

Thanks 

[Jochen]

Tacchi,

from my own experience with the P7000 drives, I strongly recommend to use the P7000 software to configure the drive, even if the motors were from Danaher. Configuring the drive with the software provides very useful features for debugging and the quality of the motor control increases significantly if you adjust the drive to the motor's inductance, which is not possible with the dip switches at all.

If you use a different motor vendor, then the P7000 tools are mandatory. To connect the drive to the PC you can use the appropriate serial programming cable (P/N 780099-01).

Kind regards,

Jochen Klier

National Instruments

[Tacchi]

Thanks for quick response.

Another question:  can I drive the engine using only NI 9512 without P70530?

Thanks 

[SMeserve]

Hi Tacchi,

You have to have a drive between the motor and the 9512.  The drive amplifies the signal appropriately so it can be used to drive a motor.  This is not possible with just the 9512.

[Jochen]

Hi Tacchi,

I just want to add to Stephen's post, that for a stepper motor the drive is not just a simple amplifier, but it's a device that generates appropriate current patterns to inject current into the motor's coils in the right order. By adjusting the current values in discrete steps, the drive also provides microstepping functionality for smooth stepper operation and increased positioning resolution.

With this said, a drive is mandatory and it's also not possible to drive a very weak motor with a 9512 directly.

Regards,

Jochen

Message Edited by Jochen on 02-25-2010 03:47 PM

[Tacchi]

StarsHockey, Jochen, THANKS!

I finally manager to connect the P70530 to PC with custom cable, and power the motor with P7000 tools.

Then, I tried interactive test panel in LabView as explained in the NI9512 tutorial, and it also worked, I just have one more question: inside the interactive test panel they use units. what is that unit? is somehow depends on what was set in the driver settings in P7000 tools or something else?

Thanks 

[SMeserve]

Hi Tacchi,

These units usually correspond to counts, but you can set them to correspond to whatever unit you want by setting it up in the properties for the axis.

[Tacchi]

Hello.

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Jochen  wrote:

Configuring the drive with the software provides very useful features for debugging and the quality of the motor control increases significantly if you adjust the drive to the motor's inductance, which is not possible with the dip switches at all.

---

 I couldn't find the inductance parameter in the P7000 tools.

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StarsHockey wrote:

These units usually correspond to counts, but you can set them to correspond to whatever unit you want by setting it up in the properties for the axis.

---

  How can i change the units? I tried to set it up for moving in mm but when i told the motor to move 100 mm it move only about 40 mm.

How can i calibrate this units to mm's for example?

Thanks