Pseudo-closed loop with stepper motor

[Soder]

Hi,

 

I have been developing a position capture application with 2 stepper motors with built in encoders. Now I have moved to 2 stepper motors but without encoders. This is going to be used for demonstration purpose of the application only, in the end there will probably be encoders anyway.

 

When I had the encoders everything worked fine, but since there are no encoders in the new setup there aren't any position to capture. Therefore I would like to set up a pseudo-closed loop for the new setup to be able to demonstrate the application.

 

I know I have to set:

I7mn0=8,

and probably set I7mn6=2 to output the PFM, but I am not sure.

 

I tested it by reading M101 for the current position. But as soon as the motor is moved the position endlessly increments/decrements.

 

I also tried changing some PID parameters according to this suggestion:

http://forums.deltatau.com/showthread.php?tid=310&highlight=Pulse+and+Direction

 

But I had the same result.

 

How do I properly setup the pseudo-loop?

 

Thanks a lot. If my information is insufficient please tell me what to I need to add.

[Soder]

Just noticed I have to change:

I102 from $078002 to $078004

 

But this breaks everything. I can't move the motor.

 

Other important variables might be:

I103=$350B

I104=$350B

I105=$35C0

 

From what I can see from the Software reference manual I103 and I104 are non standard.

I got this configration from a colleague. Trying to find out what they changed.

 

Also worth mentioning is that this is a Geo Brick LV IMS-II.

[steve.milici]

Please contact one of our Technical Support engineers at support@deltatau.com with your current setup details.

[Soder]

Done, feel free to remove this thread.