Abhijit Posted February 16, 2013 Share Posted February 16, 2013 How to configure PMAC PID filter in order to control the speed of a servo motor? External servo drive is configured in torque mode and PMAC will receive speed command on an analog input. Feedback is the simulated quadrature encoder pulses from servo drive. Link to comment Share on other sites More sharing options...
Highland Controls Posted February 17, 2013 Share Posted February 17, 2013 You don't need a PMAC for what you are doing. Can't you just put the drive in velocity mode and feed it the analog signal? Link to comment Share on other sites More sharing options...
Abhijit Posted February 17, 2013 Author Share Posted February 17, 2013 I want to have functions like counter torque to be achieved from Turbo PMAC, which let me use two servo drives in current mode and two servo motors connected to same axis via large backlash prone gear boxes. Link to comment Share on other sites More sharing options...
Sina.Sattari Posted February 18, 2013 Share Posted February 18, 2013 You can integrate the analog input in the Encoder Conversion Table, then introduce the result as a master position to the position controlled servo motor. You just have to make sure your integration is working properly before slaving your servo motor to it. Also, make sure your master position scale factor Ixx07 is adjusted properly or your motor could be commanded beyond its capability which will result in a fatal following error condition. Link to comment Share on other sites More sharing options...
Abhijit Posted February 19, 2013 Author Share Posted February 19, 2013 With this approach, what can we say about the bandwidth of the velocity loop ? Will I get bandwidth similar to the one obtained by usage of classical velocity control ? Link to comment Share on other sites More sharing options...
Sina.Sattari Posted February 19, 2013 Share Posted February 19, 2013 Abhijit, The master position is evaluated every servo cycle and input to PID every servo cycle, so your bandwidth for the velocity loop would be as good as the bandwidth you have on your PID tuning of the servo motor. Although, if you need to implement any sort of filter on your analog input, whether RC filter or digital filter in PMAC, it will affect the overall bandwidth of the system. Link to comment Share on other sites More sharing options...
Abhijit Posted February 19, 2013 Author Share Posted February 19, 2013 Thank You. -Abhijit Dandekar Link to comment Share on other sites More sharing options...
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