How to accomplish Torque and velocity control of an axis using NI motion controller

[Pras]

Used torque transducer as a primary feedback. I am able to control the torque. Used Encoder feedback as secondary feedback to control velocity. But when I run the axis at 5 rpm, I observe velocity variations of more than 200 %. What is the nessasary change Should I make to control both Torque, velocity accurately?

[Yusuf C]

Hello,

Here are a couple of suggestions that might help:
- Tune the PID parameters so that step response will be overdamped
- Increase the PID loop update period
- Reduce the noise on the analog signal coming in. 7350 series controllers are going to be better for this because they have a 16-bit ADC resolution versus 12-bit on the 7340 series.
Hope this helps! Let me know if you have any questions regarding this.

Best regards,

Yusuf Cavdarli
Applications Engineer
National Instruments