Weird intermittent bug involving proximity sensors and homing

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26 Apr 2019 22:36 #132030 by Mike@CNCproCuts.com
What is weird is that I didn't change anything ...

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29 Apr 2019 15:59 #132301 by Mike@CNCproCuts.com

PCW wrote: Can you measure the 7i77 input 07 with a voltmeter relative to field power common
in both switch states and both drive enable states?

That is measure from TB8 pin 8 to TB2 (orange) pin 8 in all states

If you had a noise issue with serial communications I would expect to see
error pop-ups in axis


Here are the voltage values ... now the relays are not changing values ... getting worse

Drives disabled, port 7 opened = 24,2V
Drives disabled, port 7 closed = 0V

Drives enabled, port 7 opened = 24,2V
Drives enabled, port 7 closed = 24,2V ... the relay is now not working on all of them ...

How do I find a ground loop ?

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29 Apr 2019 16:27 #132302 by PCW
Sounds a bit more like a missing/unconnected field common/ground so as soon as you enable the drives or turn on a relay, field common is pulled up to +24V

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29 Apr 2019 17:38 #132305 by Mike@CNCproCuts.com

PCW wrote: Sounds a bit more like a missing/unconnected field common/ground so as soon as you enable the drives or turn on a relay, field common is pulled up to +24V


Thanks ! Found an unconnected wire ... now everything works fine ... still don't know how it could have happened but ... that was the problem so thanks a lot for the insights ;)

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29 Apr 2019 17:41 #132307 by Mike@CNCproCuts.com

andypugh wrote:

Mike@CNCproCuts.com wrote: the 7i84 inputs will have names like "hm2_5i25.0.7i84.0.0.input-00"
You should be able to find them in Halshow


I had not connected the VIN yet ... now I see it so thanks ;)

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01 May 2019 14:17 #132437 by Mike@CNCproCuts.com
Thougt it was solved ... worked fine for 24hrs ... now the problem is back ... very strange ... could a ground loop take time to accumulate voltage ?

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01 May 2019 14:51 - 01 May 2019 14:51 #132442 by Mike@CNCproCuts.com
Closing it for 30 minutes ... now it works ... intermittent ... back to square one ...
Last edit: 01 May 2019 14:51 by Mike@CNCproCuts.com.

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01 May 2019 15:01 #132443 by Todd Zuercher
Sounds like a wiring problem somewhere. Check all your connections, plugs, etc. You said you found one loose connection, there could be others.

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01 May 2019 16:57 #132449 by Mike@CNCproCuts.com

Todd Zuercher wrote: Sounds like a wiring problem somewhere. Check all your connections, plugs, etc. You said you found one loose connection, there could be others.


Been checking ... didn't find anything ... must be a design error on my part for the grounding ...

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04 May 2019 16:52 #132749 by andypugh
be aware that cage clamp screw terminals can be 100% tight but that is no good if the wire is below the cage. So you need to pull each wire as well as check the screws.

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