• Register
    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search
    1. Home
    2. josar
    J
    • Profile
    • Following 0
    • Followers 0
    • Topics 1
    • Posts 6
    • Best 0
    • Controversial 0
    • Groups 0

    josar

    @josar

    0
    Reputation
    357
    Profile views
    6
    Posts
    0
    Followers
    0
    Following
    Joined Last Online

    josar Unfollow Follow

    Latest posts made by josar

    • RE: PI controller behaves different for step-up and step-down

      Thanks for the reply @tomas_hora although not very useful. As you can see from the graph in my original post, the Xp and Ti parameters are correctly set. Stepping up from 2 to 3, the PI controller works fine. Stepping down from 3 to 2, the behavior is strange and unexpected. Neither changing the parameters nor switching to PID control solves the problem.

      Also your reply about the B34 and B35 blocks does not bring any useful information. I can see the heating/cooling description in the title of the block. I'm trying to control pressure. Which one should I use then? The documentation is the same for both blocks.

      Please explain. Thanks.

      posted in Mervis
      J
      josar
    • RE: PI controller behaves different for step-up and step-down

      Here are the parameters. In the meantime, I have switched to B34 as I was trying to find the difference between the two PI controllers provided by Mervis. Can you please explain when to use B34 and B35?

      Thx.

      0_1568328646285_mervis_pi_parameters.png

      posted in Mervis
      J
      josar
    • RE: Hydraulic Press project on Neuron M203 - beginner needs help

      Hi @r3sist,
      any progress with your project? Very interesting.

      posted in Mervis
      J
      josar
    • PI controller behaves different for step-up and step-down

      I was trying to use the built-in PI controller only to find out that it is behaving unexpectedly. When stepping up, it works as expected - Proportional term kicks in and afterwards the Integrating term makes it to the desired value. But when stepping down, no action of the P term is observed and a big undershoot happens.
      0_1568147847270_pi_control_axon.png
      Is this normal and is this an intended behaviour? If so, what is the purpose? And how to make the PI controller behave in a symmetrical way?

      This older post asks moreorless the same question, but there is no reply: P term cutoff in PID controller :-(

      posted in Mervis
      J
      josar
    • RE: Weird PID Behavior

      Hi guys,
      I know this is a Mervis section, but if PID control is what you are after, consider switching to REXYGEN. Works like charm.

      posted in Mervis
      J
      josar