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Author Topic: this new usb -network? break out board set for 24volts  (Read 8128 times)

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Offline nobby

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this new usb -network? break out board set for 24volts
« on: November 17, 2014, 09:48:41 AM »
http://www.ebay.co.uk/itm/4-Axis-USB-CNC-Mach3-E-CUT-Motion-Controller-Card-24V-Interface-Breakout-Board-/281419748494?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item4185ec948e

does that mean if its set to 24 volts for step and direction signals to servo drives, you can connect it network rather than usb

I can't understand it. Is it either or - I mean if you have one with powered 24volts and not powered by the 5v from the usb, do you then connect it network?
or do you still need to send it usb

so I simply need one of these a 24 volt power supply, can it be a little thing on a plug? - network address, panasonic minas a4 200w - 70mm pcd - 11mm shaft

you don't get a 24v power option in a pc power supply do you? i.e. hide this card in the bottom of the computer tower?
wireless network

run a servo stystem
« Last Edit: November 17, 2014, 10:03:43 AM by nobby »

Offline nobby

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Re: this new usb -network? break out board set for 24volts
« Reply #1 on: November 17, 2014, 10:11:58 AM »
my mistake, it doesn't say anywhere that the step and direction - pulse train is 24 volts - but it must be???



Offline ger21

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Re: this new usb -network? break out board set for 24volts
« Reply #2 on: November 17, 2014, 02:23:50 PM »
Don't buy cheap Chinese products with no support or documentation.
Gerry

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http://www.thecncwoodworker.com/2010.html

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Offline Hood

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Re: this new usb -network? break out board set for 24volts
« Reply #3 on: November 17, 2014, 03:58:00 PM »
The step/dir will almost certainly be 5v, it is the standard, it will be the I/O that is 24v.
Agree with Ger, buy cheap and get a headache for free.
The hardware may be cheap but almost certainly the manual and support will be non-existent. Also plugins tend not to support all of Machs functions and the ones they do support can work differently than Machs standard way of working.

Hood

Offline nobby

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Re: this new usb -network? break out board set for 24volts
« Reply #4 on: November 17, 2014, 04:09:36 PM »
what i sthe I/O ?
thanks

ddoes it mean this
Use  external 12V-24V DC power supply to isolate USB and external  port,
usb in @ 5v and external port - 3 axis step and direction?
everything else is 24v?
i still don't get it
can a tb6600 chip function with 24v inputs?
i mean what on the card needs 24 volts?
home switches?
spindle function?

looks like it only cam out three weeks ago.......................

« Last Edit: November 17, 2014, 04:15:53 PM by nobby »

Offline Hood

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Re: this new usb -network? break out board set for 24volts
« Reply #5 on: November 18, 2014, 05:40:57 PM »
I/O is Inputs and Outputs.
Yes they will be 24v, it is much better than 5v if implemented properly due to its increased immunity to noise issues. That is the reason most, if not all,  industrial machines will use 24v.

Hood

Offline nobby

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Re: this new usb -network? break out board set for 24volts
« Reply #6 on: November 19, 2014, 04:27:12 AM »
oh,I see so it means it isolates the computers external port and the input on the card at 5v usb
-the usb connection cannot be 24v
it optoisolates them, but they are still output at 5v, the breakout board uses its own power at 24v
to run everything else - step and direction is 24v
limit switches 24v
so in theory it could be alright for servo drives wanting 24v pulse train step and direction.
so if I have 200 watt servo drives with 70 - odd volts up the wires @ 2 amps
I am going to have 24 volts in the limit switching - do I then have to up the guage of the wireing of the limit switches to 1.5mm core, or is .5mm core wire ok @ 24v

PLUS is the cabling on a 200 watt 71volt  2 amp motor to servo drive 2.5mm or can oit be 1.5 = do I have to still sheild the wires with and use cy cable.

I think I am ok with the servo malarky, the only thing that is bothering me now is I suppose the most critical - and at first I poverlooked it completely
but they list them as high inertia - medium inertia and low
/\ I don't get that....... I just want to servo up my little 2 foot bed machine
the good thing is the panasonic minas a4 @ 200w has a motor bolt pitch circle 'on the diagonals at 70mm - the nema 23 is 68 - so not too far off
why is the stator so fat though at 11mm over 6mm or even 8mm.
can I lop a bit from the motor shaft length or does this effect the balance.......
/\ sorry

is the very idea of running servos you need not sheild the wires and that the drives have a battery in them so even when you switch the machine off, it still hold homing information ?

they don't run at the full voltage all the time do they? - the voltage listed on them is simply the max? - so If it needs the max volts IT can IF it needs to pull it?

is the whole idea about servo motors and drives - the hall positioning will only work at 24 volts 'well''

apologies - just trying to get meheed around it.

is 200w too much foor a littl emachine?



« Last Edit: November 19, 2014, 04:36:57 AM by nobby »

Offline Hood

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Re: this new usb -network? break out board set for 24volts
« Reply #7 on: November 19, 2014, 04:36:11 AM »
As said prevously, Step/Dir will almost certainly  be 5v, possibly differential, all other digital I/O will be 24v, if it has analogue I/O then it will likely be 0-10v.
I have not looked properly at the link you gave as the info on there is poor and it is what you should expect from the customer service from such a vendor, but that is up to you, if you want to take a risk then go for it ;)

Hood

Offline nobby

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Re: this new usb -network? break out board set for 24volts
« Reply #8 on: November 19, 2014, 04:58:13 AM »
Ok Mr. Hood,
I get it, the board out puts step and direction still at 5v
the 24v aspect is merely for 24v limit switching for people experiencing interferance when using the computers 5v for limit switching
I don't have spindle control, so I would only guess that you need a 10v analougue signal for spindle control, that yoiu can't then do at 5v computer.
plus i suppose the e-stop would benefit from not being fed 5v from the pc too and  favor 24v.

oh bugger, back to the starting board then, why oh why do they picture the panasonic minas system then and say its ok for servo drives, when they need 12-24v

is it something to do with 800 khz over the 200 of the earlier usb break out boards.
Thank you for your time

-its deffo not a network connection  - i think that plug must be for a hand wheely thing


« Last Edit: November 19, 2014, 05:08:54 AM by nobby »

Offline Hood

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Re: this new usb -network? break out board set for 24volts
« Reply #9 on: November 19, 2014, 05:12:12 AM »
Are you sure the Minas are 24v Step/Dir?
I have not looked at their specs but that is unusual, more normal that they would be 5v differential input.
Hood