Re: [Emc-users] 7i72 max output current question
Hi Robin,
I would do that if the manual didn't say the boards are ready for inductive
loads (and now Peter ratified that too) or if I'm too close to the max
current threshold. But I really want to keep this as simple as possible at
this final stage. I was worried because I was used to solenoids that draw
300 mA maximum, but these valves I purchased are a little bit more hungry.
Thanks for the advice and stay well!
El dom, 15 may 2022 a las 21:55, Robin Szemeti via Emc-users (<
emc-users@lists.sourceforge.net>) escribió:
> Personally, I would wire up some external driver simply to avoid any
> accident with the 7i72 ... optos would be involved if it was me.
>
> On Mon, 16 May 2022 at 01:27, Peter C. Wallace wrote:
>
> > On Sun, 15 May 2022, Leonardo Marsaglia wrote:
> >
> > > Date: Sun, 15 May 2022 20:59:34 -0300
> > > From: Leonardo Marsaglia
> > > Reply-To: "Enhanced Machine Controller (EMC)"
> > >
> > > To: "Enhanced Machine Controller (EMC)" <
> emc-users@lists.sourceforge.net
> > >
> > > Subject: [Emc-users] 7i72 max output current question
> > >
> > > Hi guys, I hope you're all doing great
> > >
> > > This could be probably for Peter but most of you will know the answer
> so
> > > here it goes.
> > >
> > > I have to drive some 24 VCC pneumatic electrovalves and I would like to
> > use
> > > 7i72's outputs directly. Each valve consumes 400 mA and the 7i72 max
> > > current per output is 300 or 350 mA. But, the short circuit protection
> > per
> > > output is triggered at 800 mA. So I was thinking in two possible ways
> to
> > > drive the valves:
> >
> >
> > 400 mA per output should be OK unless you have mode than 3 outputs on at
> > once
> > per chip (the cards are tested at 500 mA)
> >
> > Do make sure that the solenoids have flyback diodes
> >
> >
> > >
> > > 1- to accommodate one valve per output (without exceeding the 1.4 amps
> of
> > > max current per output chip) and hope the 400mA are not too much for
> the
> > > overcurrent monitoring.
> > >
> > > 2- to drive every valve with two consecutive outputs to divide the
> > current
> > > in half so every output would only see 200 mA (again without exceeding
> > the
> > > max current per output chip).
> > >
> > > What do you guys think? I'm trying to avoid to install any extra
> > circuitry
> > > if possible.
> > >
> > > Thank you as always for your help!
> > >
> > > ___
> > > Emc-users mailing list
> > > Emc-users@lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
> > >
> >
> > Peter Wallace
> > Mesa Electronics
> >
> > (\__/)
> > (='.'=) This is Bunny. Copy and paste bunny into your
> > (")_(") signature to help him gain world domination.
> >
> >
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> ___
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>
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Re: [Emc-users] 7i72 max output current question
Hi Peter,
400 mA per output should be OK unless you have mode than 3 outputs on at
> once
> per chip (the cards are tested at 500 mA)
>
That's excellent news. One less thing to worry about :)
> Do make sure that the solenoids have flyback diodes
>
I'll do that.
Thanks Peter for the quick response.
Stay well!
El dom, 15 may 2022 a las 21:30, Peter C. Wallace ()
escribió:
> On Sun, 15 May 2022, Leonardo Marsaglia wrote:
>
> > Date: Sun, 15 May 2022 20:59:34 -0300
> > From: Leonardo Marsaglia
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: "Enhanced Machine Controller (EMC)" >
> > Subject: [Emc-users] 7i72 max output current question
> >
> > Hi guys, I hope you're all doing great
> >
> > This could be probably for Peter but most of you will know the answer so
> > here it goes.
> >
> > I have to drive some 24 VCC pneumatic electrovalves and I would like to
> use
> > 7i72's outputs directly. Each valve consumes 400 mA and the 7i72 max
> > current per output is 300 or 350 mA. But, the short circuit protection
> per
> > output is triggered at 800 mA. So I was thinking in two possible ways to
> > drive the valves:
>
>
> 400 mA per output should be OK unless you have mode than 3 outputs on at
> once
> per chip (the cards are tested at 500 mA)
>
> Do make sure that the solenoids have flyback diodes
>
>
> >
> > 1- to accommodate one valve per output (without exceeding the 1.4 amps of
> > max current per output chip) and hope the 400mA are not too much for the
> > overcurrent monitoring.
> >
> > 2- to drive every valve with two consecutive outputs to divide the
> current
> > in half so every output would only see 200 mA (again without exceeding
> the
> > max current per output chip).
> >
> > What do you guys think? I'm trying to avoid to install any extra
> circuitry
> > if possible.
> >
> > Thank you as always for your help!
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
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Re: [Emc-users] 7i72 max output current question
On Mon, 16 May 2022, Robin Szemeti via Emc-users wrote:
Date: Mon, 16 May 2022 01:52:37 +0100
From: Robin Szemeti via Emc-users
To: "Enhanced Machine Controller (EMC)"
Cc: Robin Szemeti
Subject: Re: [Emc-users] 7i72 max output current question
Personally, I would wire up some external driver simply to avoid any
accident with the 7i72 ... optos would be involved if it was me.
The 7I72 is designed to drive inductive loads and is fully
isolated from the controller, additional isolation is superfluous
Peter Wallace
Mesa Electronics
(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
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Re: [Emc-users] 7i72 max output current question
Personally, I would wire up some external driver simply to avoid any
accident with the 7i72 ... optos would be involved if it was me.
On Mon, 16 May 2022 at 01:27, Peter C. Wallace wrote:
> On Sun, 15 May 2022, Leonardo Marsaglia wrote:
>
> > Date: Sun, 15 May 2022 20:59:34 -0300
> > From: Leonardo Marsaglia
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: "Enhanced Machine Controller (EMC)" >
> > Subject: [Emc-users] 7i72 max output current question
> >
> > Hi guys, I hope you're all doing great
> >
> > This could be probably for Peter but most of you will know the answer so
> > here it goes.
> >
> > I have to drive some 24 VCC pneumatic electrovalves and I would like to
> use
> > 7i72's outputs directly. Each valve consumes 400 mA and the 7i72 max
> > current per output is 300 or 350 mA. But, the short circuit protection
> per
> > output is triggered at 800 mA. So I was thinking in two possible ways to
> > drive the valves:
>
>
> 400 mA per output should be OK unless you have mode than 3 outputs on at
> once
> per chip (the cards are tested at 500 mA)
>
> Do make sure that the solenoids have flyback diodes
>
>
> >
> > 1- to accommodate one valve per output (without exceeding the 1.4 amps of
> > max current per output chip) and hope the 400mA are not too much for the
> > overcurrent monitoring.
> >
> > 2- to drive every valve with two consecutive outputs to divide the
> current
> > in half so every output would only see 200 mA (again without exceeding
> the
> > max current per output chip).
> >
> > What do you guys think? I'm trying to avoid to install any extra
> circuitry
> > if possible.
> >
> > Thank you as always for your help!
> >
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
>
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>
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Re: [Emc-users] 7i72 max output current question
On Sun, 15 May 2022, Leonardo Marsaglia wrote:
Date: Sun, 15 May 2022 20:59:34 -0300
From: Leonardo Marsaglia
Reply-To: "Enhanced Machine Controller (EMC)"
To: "Enhanced Machine Controller (EMC)"
Subject: [Emc-users] 7i72 max output current question
Hi guys, I hope you're all doing great
This could be probably for Peter but most of you will know the answer so
here it goes.
I have to drive some 24 VCC pneumatic electrovalves and I would like to use
7i72's outputs directly. Each valve consumes 400 mA and the 7i72 max
current per output is 300 or 350 mA. But, the short circuit protection per
output is triggered at 800 mA. So I was thinking in two possible ways to
drive the valves:
400 mA per output should be OK unless you have mode than 3 outputs on at once
per chip (the cards are tested at 500 mA)
Do make sure that the solenoids have flyback diodes
1- to accommodate one valve per output (without exceeding the 1.4 amps of
max current per output chip) and hope the 400mA are not too much for the
overcurrent monitoring.
2- to drive every valve with two consecutive outputs to divide the current
in half so every output would only see 200 mA (again without exceeding the
max current per output chip).
What do you guys think? I'm trying to avoid to install any extra circuitry
if possible.
Thank you as always for your help!
___
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Peter Wallace
Mesa Electronics
(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
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