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Author Topic: Home Signal  (Read 2040 times)

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Re: Home Signal
« Reply #10 on: February 20, 2018, 10:47:33 PM »
Hi RT,
I can understand not wanting the logfile to get clogged up logging a home signal which is not being used.

If I understand the status of the thread is that if you disable the home signal then the homing routine fails
or at least objects and throws an error.

May I suggest instead trying unmapping the motor from the axis, this is possible programmatically. My hope is
that with the motor unmapped the homing routine will not throw an error. It may not even require you to disable
the home signal.

Craig
My wife left with my best friend...
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Re: Home Signal
« Reply #11 on: February 21, 2018, 01:17:50 AM »
Do you have the home switch signal also assigned as a limit switch or something else? I thought home switches were only recognized during a homing routine. The signal may still be seen in Mach but shouldn't throw an error I don't think.
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Re: Home Signal
« Reply #12 on: February 21, 2018, 01:32:51 AM »
Hi,
Op's description of the problem is not that the home switch event causes a fault but every time it triggers it gets logged. If he happens to be using the axis
as a spindle the logfile becomes loaded with these events.

Craig
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Re: Home Signal
« Reply #13 on: February 21, 2018, 07:25:41 AM »
OK, thanks Craig. I thought is was throwing an error.

Quote
Trying to stop the PMDX411 from throwing an 'C axis homing tripped' error message every revolution when using the spindle as a spindle.

I'll see what I can find out (hopefully today) about this.
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Re: Home Signal
« Reply #14 on: February 21, 2018, 08:02:12 AM »
Hi,
the error that OP referred to in the quote occurred if he disabled the homing signal.

OP would disable the C axis homing signal to prevent the log from filling up with notifications each revolution of the spindle.
Then the C axis did not have a correctly configured home switch and the 411 would object and throw a genuine error.

The challenge is to provide a programmatic means to have an indexing (C axis) OR a regular spindle without undesirable log entries when in spindle mode.

Craig
My wife left with my best friend...
     and I miss him!
Re: Home Signal
« Reply #15 on: February 21, 2018, 08:45:10 AM »
Everyone seems hell bent on solving this issue in software, while a very
simple hardware solution exists.

Since the operator has to stop to slip a timing belt on or off when changing
modes, it should be easy to have a switch in series with the offending home
signal from the sensor and using that the operator could use that to block the
signal so it would not fill the logs. You could even automate it by using the
RUN signal for the spindle to control a relay that switched the signal.

Steve Stallings
www.PMDX.com
For PMDX product support, please use PMDX forum or direct email for quickest response. We do not use this forum as our primary product support site.
Re: Home Signal
« Reply #16 on: February 21, 2018, 09:12:43 AM »
But if I did that then I would have no spindle speed feedback and wouldn't be able to do threading.
Re: Home Signal
« Reply #17 on: February 21, 2018, 09:31:17 AM »
If you have enough inputs you could feed the same signal to two inputs,
one for Home and one for Index. The switch would only kill the one for
Home.
Steve Stallings
www.PMDX.com
For PMDX product support, please use PMDX forum or direct email for quickest response. We do not use this forum as our primary product support site.
Re: Home Signal
« Reply #18 on: February 21, 2018, 11:40:01 AM »
Hi Steve,
yes, great idea.

Craig
My wife left with my best friend...
     and I miss him!
Re: Home Signal
« Reply #19 on: February 22, 2018, 10:48:58 AM »
Steve, I think that I have one input left and that could work.  When the stepper is not engaged it is parked and I could put a NC switch that would open when parked against it.  Thanks for the idea.

RT