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Author Topic: External Estop Requested  (Read 6912 times)

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Offline djk

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External Estop Requested
« on: April 22, 2013, 12:39:26 PM »
I get this from mach3 when I try to tune two of my motors 6A 7Nm. The 3d is a 6A 3.6Nm and it works fine.
Thanks for any help

Offline Hood

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Re: External Estop Requested
« Reply #1 on: April 22, 2013, 01:31:48 PM »
Sounds like you may be getting noise from the drives. Is this servo or stepper? What kind of drives? Have you got the E-Stop and Limits wiring shielded and correctly grounded?
Hood

Offline djk

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Re: External Estop Requested
« Reply #2 on: April 22, 2013, 02:17:16 PM »
I have KINCO 2M2280N High voltage stepper drives. No limit switches yet

Thanks

Offline Hood

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Re: External Estop Requested
« Reply #3 on: April 22, 2013, 02:21:02 PM »
Are you using the parallel port or do you have something like the SmoothStepper?

Hood

Offline djk

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Re: External Estop Requested
« Reply #4 on: April 22, 2013, 03:17:32 PM »
Parrallel port with a PMDX 126 breakout board, inline filter for the pc

Offline Hood

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Re: External Estop Requested
« Reply #5 on: April 22, 2013, 04:55:55 PM »
Ok try putting 2000 in Debounce Interval on the General Config page.
If that helps reduce it as low as you can.
Hood

Offline djk

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Re: External Estop Requested
« Reply #6 on: April 22, 2013, 05:42:50 PM »
Thanks I will try it tomorrow morning

Offline djk

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Re: External Estop Requested
« Reply #7 on: April 23, 2013, 06:12:04 AM »
Hi Hood

I started with 2000 but have reached 20 000 for the moment.Will this be a problem or would it be better to change my drives

Thanks

Offline Hood

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Re: External Estop Requested
« Reply #8 on: April 23, 2013, 07:05:09 AM »
That is a lot and means you have a serious noise issue.
The thing to remember is low voltage signalling (5v) which people tend to use with Mach, is that there is not much potential difference between a high and a low signal, somewhere about 2.5v and thus noise can easily cause issues. Much better to have 24v signalling but that is not so easy to accomplish with the standard breakout boards available although that is slowly changing as people realise why Industrial machines use 24v I/O.

Anyway when you are using 5v signalling you have to be particular about shielding, stepper motor wires should be shielded, all 5v signal wires should be shielded and really even power wires should be shielded. It is not enough just to have a shield, that shield has to be properly grounded and usually that means just one end and all shields should be routed to a single ground point (Star Grounding)


You may get away with just shielding your E-Stop and making sure any high voltage cables are routed as far as possible away from signalling wires.

Hood

Offline djk

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Re: External Estop Requested
« Reply #9 on: April 23, 2013, 12:23:47 PM »
Im up two 50 000, so decided two check all my wiring.Took the earth off the machine, got a spark, so tested the 3 motors ,30vac 60vac and 70vac between the motors and earth.I dont think this is normal ?