Retrofitting HURCO BMC30

tommylight
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28 Apr 2024 18:07 #299265 by tommylight

Replied by tommylight on topic Retrofitting HURCO BMC30

Why 2 of 7i92? Why 7i80?
I used a single 7i92, 7i74, several 7i70 and 7i71, and 7i77.
Since there is no easy to find 7i77, i would use 7i92TM plugged directly into a 7i85, then a 7i83 for the analog outputs, and add 7i70 inputs and 7i71 outputs as required.
All of those can be easily found, well if there is no 7i92, get a 7i96S, adds another sserial and some inputs and outputs, and some stepgens you probably have no use for, but will come handy if you ever have to change drives, new ones can do step/dir, most of them.

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rasmus
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28 Apr 2024 18:47 - 28 Apr 2024 18:52 #299268 by rasmus

Replied by rasmus on topic Retrofitting HURCO BMC30

Thank you for the quick replay as always!

Yes that is maybe a little overkill.

When having a further look at it a 7i92tm directly connected to a 7i77 (EUSurplus did have this in stock), a 7i74 and 7i70 and 7i71 for IO:s would also work fine as I can understand it and it will be a little cheaper as well

Last edit: 28 Apr 2024 18:52 by rasmus.

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tommylight
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28 Apr 2024 20:55 #299274 by tommylight

Replied by tommylight on topic Retrofitting HURCO BMC30

Not sure as it was a long time ago, but i am pretty sure you can have everything working with just:
7i92TM plugged directly to 7i77 and a 7i84 connected with a cut in half LAN cable.
That is 64 inputs and 32 outputs, should be more than enough.
I did it the way i did as i am a control freak and like to have everything at a glance so 7i70 and 7i71 having LED for each IN/OUT helps with that. And if you look at my retrofits, all have every IN/OUT on screen ... yeah freak!

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rasmus
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11 Aug 2024 09:26 - 11 Aug 2024 11:29 #307474 by rasmus

Replied by rasmus on topic Retrofitting HURCO BMC30

Is in the works of finishing the electrical drawings of the BMC30 update.

But i would want to preserve some of the safety features.

In the current configuration a lot of the outputs are fed 24V through a relay and I would like to still have it like this.
But reading the manuals for the 7i77 and 7i71 the cards should not be provided VFIELD through a relay.

What is the danger to add a relay in the VFIELD is it the risk of contact bouncing when enabled or that the power could switch rapidly?
Would it be acceptable to provide power through a safety relay that needs to be reset to be enabled again? (Then rapid on/off switching will not be that rapid)

Update:
Solved it by having the actuators over the same ground which a relay switches instead.

Last edit: 11 Aug 2024 11:29 by rasmus.

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