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Home Forum Configuring LinuxCNC PnCConf Wizard PnCConf pid loop wiring error

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TOPIC: PnCConf pid loop wiring error

PnCConf pid loop wiring error 17 Aug 2012 07:46 #23340

  • PCW
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There appears to b a connection/signal name problem at least with the 7I77 and maybe
all PID loops that use encoders and the PID comp:

The the encoder velocity pin connects to PID comps command-deriv pin
instead of the feedback-deriv pin as it should.

This was caught by Todd Zuercher:

www.linuxcnc.org/index.php/english/compo...ew&catid=10&id=23211
Last Edit: 17 Aug 2012 07:49 by PCW.
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Re:PnCConf pid loop wiring error 17 Aug 2012 18:11 #23375

  • cmorley
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This would have affected virtually all servo systems in 2.5 from PNCconf.

I have fixed the name from commanded to feedback (oops!)
just so I'm clear feedback-deriv should be connected to encoder.velocity
and x-vel-fb makes sense for the signal name.

Chris M
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Re:PnCConf pid loop wiring error 17 Aug 2012 20:26 #23376

  • PCW
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Yes, PID.n.feeback-deriv connects to encoder.n.velocity (or resolver.n.velocity)

PID.n.command-deriv should probably be left unconnected
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Re:PnCConf pid loop wiring error 17 Aug 2012 22:35 #23378

  • cmorley
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Thanks Peter. I pushed the fix.
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