Problem when analog feedback is set as primary feedback

I have a simple labview program for pressure control. Primary feedback is set to ADC 1 in MAX. ADC 1 is connected to a voltage signal which represents a pressure. When the motor run from program, the motor stopped after certain time because move complete turn to True, but the position reading didn't reach the desired position at this time. If the motor run from MAX, the motor didn't stop untill the position reading reached the desired value.
The configuration file exported from MAX and lv program are attached. I would appreciate you very much if anybody could find problems in my program or configuration.
I am using PCI 7342.
Thanks.
Attachments:
ADC_primary_feedback.xml ‏581 KB
pressure_control_2.vi ‏74 KB

Hello Ya-hoo.
I first just want to clarify what I think your issue is. It sounds like you essentially have a servo motor system with analog feedback. This system is moving to the desired position (pressure) when it is run through 1-D interactive in MAX, but it does not correctly move in your LabVIEW program.
This situation is uncommon but it can happen. Generally speaking, the things to make sure of:
Be sure the settings are saved in MAX and that the board is initialized with those settings before running the LabVIEW program
Make sure you are not calling the stop VI too early. In the while loop you are polling the move complete criteria. What happens if you take that out and simply wait until the user pushes the stop button? If this fixes
the problem, try adjusting some of the Move Complete criteria (Trajectory Settings in MAX) and see if that changes the behavior.
As far as the tuning is concerned, I will refer you to the following tutorial on Understanding Servo Tune. This should go over some tuning concepts.
Hope this helps.
Regards,
Colin C.
Applications Engineering
Colin Christofferson
Community Web Marketing
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Problem using analog feedback on pix7340

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I am trying to use analog force feedback on one of my axis on pxi 7340. The problem is that MAX always uses encoder as feedback even if i configure it to be analog. In MAX i disabled encoder and enabled the appropriate ADC for the axis and set the position to few hundred counts so the controler stops the axis when force is above a small value (around 1V). If i start motion it moves the same as if the feedback was encoder (for few hundred counts). I dont know what is happening. I red the motion manual and if i understood it correctly the axis should move at the configured speed until the force is larger as value i set in position field.
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Problem when combinning PWM signal and Analog signal TOGETHER!

Hello everybody,
first of all i have DAQmx 6212, and i need to run a small water pump (9V-16V) which needs to be driven by a PWM signal; also i have a motor (5V-13V) for a water valve that needs to be driven by a analog signal and it has a built in a force feedback potentiometer, i connected on the extremeties of this potentiometer +5V from the DAQmx and used the output voltage from the third extremety as a diagnose value for knowing the position of the motor.
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Attachments:
pwm.out.in.analog.out.in.vi ‏45 KB

Dear nathand thanks for your reply,
i have ran the vi again and i am have error no 50103 from the (AI, number 3. ) but it is not displaying the error message, the VI keeps running without any error notification.
adding to that, i have tested the VI again today by placing (1. and 2.for the PWM inout) together in one VI and (3. and 4.for the motor valve) in another VI and ran them one after the other, i had another problem. if i turn the motor valve vi, the motor will run smoothly but in the pwm vi i will have a problem in which the AI did not read any value. also doing this vice versa by running the pwm vi first it will work perfect but the motor vi will have problem in reading the measured voltage in AI during this the motor will keep on running without stopping.
so i think now the problem is in AI (2. and 3.) readings they are interfering on each other but i am not discovering where is my problem...
Q: does the AI's seems well build or i can do it in an another way so to get over the interfering?
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