On Sun, 15 May 2022, Leonardo Marsaglia wrote:
Date: Sun, 15 May 2022 20:59:34 -0300
From: Leonardo Marsaglia <ldmarsag...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
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!
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Peter Wallace
Mesa Electronics
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