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31 May 2017 12:22 #93880 by andypugh
Replied by andypugh on topic 7i73 questions

Any thoughts about having the limits/home switches NO as I would like to take out the relay-board
this just for clean install that is easy to get a overall view of.


How hard would it be to change the switches?

Though the OEM thought that NO was OK, and presumably knew what they were doing.

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31 May 2017 12:57 #93881 by tecno
Replied by tecno on topic 7i73 questions
Not possible to get physically to do this, way too much heavy metal to be removed. The Z knee and X axis table.

Below schematics for the NO/NC conversion via relay-board
Attachments:

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31 May 2017 13:02 #93882 by andypugh
Replied by andypugh on topic 7i73 questions
I can't help feeling that the conversion relay board adds more possible failure modes than just keeping the NO switches.

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31 May 2017 13:03 #93883 by tecno
Replied by tecno on topic 7i73 questions
I agree even if NO is a bit backwards.

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07 Jun 2017 18:02 - 07 Jun 2017 18:03 #94254 by tecno
Replied by tecno on topic 7i73 questions
Been away for a few days on short holiday.

Have made up following list for connecting I/O to 7i73 in the controlbox.

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Is this somewhat correctly connected?
Want to use 24VDC on Limit/Home swithes and convert these signals to 3.3VDC

My order is now shipped from Mesa and hopefully here by the end of next week.
Attachments:
Last edit: 07 Jun 2017 18:03 by tecno.

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07 Jun 2017 18:51 #94259 by andypugh
Replied by andypugh on topic 7i73 questions

Want to use 24VDC on Limit/Home swithes and convert these signals to 3.3VDC


It might be easier to use an opto-isolator.

Something like se.rs-online.com/web/p/optocouplers/4530909/

But I would suggest seeing if PCW can suggest an optimal output-type for it.

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07 Jun 2017 19:06 #94262 by tecno
Replied by tecno on topic 7i73 questions


I have made these to my former Kflop/Kanalog setup so I can use these.
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09 Jun 2017 13:28 - 09 Jun 2017 13:56 #94341 by tecno
Replied by tecno on topic 7i73 questions
PCW

Any hint on how to sink higher loads on these outputs that only can sink 4mA?

Transistor or FET's?


I have some BSP125 Logic FET´s, I assume these would do the job?
Only load would be signal lamps.
Last edit: 09 Jun 2017 13:56 by tecno.

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09 Jun 2017 15:05 #94352 by PCW
Replied by PCW on topic 7i73 questions
FETs or Optos should work fine

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12 Jun 2017 13:06 #94425 by andypugh
Replied by andypugh on topic 7i73 questions
Sounds like a good use for the ULN.... chips too.
se.rs-online.com/web/p/darlington-transistors/7141167/
Handy 8-channel package for logic-level to 50V / 0.5A

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