Controlling dc motor using PCI-7342 and MID-7652

Hi,
I am trying to control an electric linear actuator driven by a 24V dc motor (no encoder). The feedback is coming from an integrated analog linear potentiometer (+10v to -10V). I am using the automatic analog feedback vi and created my desired feedback profile. I began with a Kp value of 9, all other gains set to zero for now. The problem is that there is a constant offset of approx. 8V between the desired profile and the actual feedback from the linear pot. I have ADC 1 configured as -10 V to +10 V. I am not sure if its a wiring problem or there is something that needs to be configured in measurement & automation, axis 1. I am new to motion control so bear with me.
Thanks

Hi there,
Where are you measuring this 8V difference? Is it the difference between the servo output of the MID-7652 and the analog feedback input to the 7652 analog input channels?
If you try changing the PID constants in your control loop, does this 8V difference remain the same?
Way S.
NI UK Applications Engineer

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Attachments:
Screenshot-NI-DAQmx Test Panels.png ‏17 KB
NI-NEW_error.txt ‏8 KB
shortsyms.txt ‏973 KB

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I have a testing machine (which permits to stretch or to compress samples) that I have to analyze with an aim to re-do the processing part (command part).
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Attachments:
diagram.doc ‏292 KB

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sahizansalman,
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Message Edited by mishkin on 03-11-2010 07:42 AM
Misha

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Encoder: http://www.anaheimautomation.com/manuals/encoder/L010723%20-%20ENC-A2N%20Single-Ended%20Encoder%20wi...

Thanks for the reply, I am trying to run any of the find reference example VIs from NI. I've not edited the code in any way.
The motors will run with the wiring I've posted, it'll move to the forward limit switch then come back again but it will then hit the home switch, the motor stops and cannot be started again until it is manually moved off the home switch. It has never made it all the way to the reverse limit switch meaning I cannot use home (it stops) or the centre (can't find the reverse limit) as a reference point.
It was suggested to me I might have the grounds miswired, the manuels were not all that clear so I'm unsure.

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% uname -a
SunOS snt5010 5.10 Generic_127111-11 sun4v sparc SUNW,SPARC-Enterprise-T5220
From Sun Documentation:
The getrctl() function provides a mechanism for iterating through all*
of the established values on a resource control. The iteration is
primed by calling getrctl() with old_blk set to NULL, a valid resource
control block pointer in new_blk, and specifying RCTL_FIRST in the
flags argument. Once a resource control block has been obtained,
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My question is concerning "all of the established values on a resource control".
Why not "*_the only value_ of a resource control*"? Why several?
For instance, there may be several values for project.max-shm-memory.
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% uname -a
SunOS snt5010 5.10 Generic_127111-11 sun4v sparc SUNW,SPARC-Enterprise-T5220
From Sun Documentation:
The getrctl() function provides a mechanism for iterating through all*
of the established values on a resource control. The iteration is
primed by calling getrctl() with old_blk set to NULL, a valid resource
control block pointer in new_blk, and specifying RCTL_FIRST in the
flags argument. Once a resource control block has been obtained,
repeated calls to getrctl() with RCTL_NEXT in the flags argument and
the obtained control in the old_blk argument will return the next
resource control block in the sequence. The iteration reports the end
of the sequence by failing and setting errno to ENOENT.
My question is concerning "all of the established values on a resource control".
Why not "*_the only value_ of a resource control*"? Why several?
For instance, there may be several values for project.max-shm-memory.
What does that mean? Which value should one use (if they are different)?
Alex Vinokur
Edited by: Alex-Vinokur on Nov 18, 2008 9:25 PM

Controlling dc motor using PCI-7342 and MID-7652

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