Basic Mesa 7i76e Wiring Question

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29 May 2019 03:49 #135243 by PCW
You are not using the encoder index input (IDX+ = TB3 pin 13) so its free
(you need to jumper it to TTL mode)

Diode spec is not very important but low drop

Not sure if you could use a relay, the Error/reset pin is low current AFAIK
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29 May 2019 05:15 #135247 by thefabricator03

PCW wrote: You are not using the encoder index input (IDX+ = TB3 pin 13) so its free
(you need to jumper it to TTL mode)

Diode spec is not very important but low drop

Not sure if you could use a relay, the Error/reset pin is low current AFAIK


Thanks for that PCW,

One more thing, What does SPARE S/D OUT mean?

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29 May 2019 12:48 #135266 by Todd Zuercher
Step/Dir
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07 Jul 2019 04:27 - 07 Jul 2019 04:28 #138767 by thefabricator03

PCW wrote: You are not using the encoder index input (IDX+ = TB3 pin 13) so its free
(you need to jumper it to TTL mode)

Diode spec is not very important but low drop

Not sure if you could use a relay, the Error/reset pin is low current AFAIK


PCW,

I am trying to set up my drive fault detection from my Gecko 320X drives using the 7i76e encoder index pin to read the error/reset circuit as you suggested earlier in this thread,

I have wired TB3 pin 13 to link into the error/reset circuit and I have set W13 to TTL.

I cannot get the encoder input to change state in HAL Show when I apply power to the drives and when I fault them. Nothing under encoder changes in Hal show when I turn the drives off and on.

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Last edit: 07 Jul 2019 04:28 by thefabricator03.

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07 Jul 2019 15:32 #138803 by PCW
I think the 7I76E manual is wrong here. W10 sets the input mode for Index

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08 Jul 2019 00:53 #138829 by thefabricator03
I have changed the jumper settings and still cannot get anything to change state in the hal show,

What is I were to wire up the negative lead from the circuit to IDX- pin 14 on TB3 and set it to differential?

Will that work?

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08 Jul 2019 02:25 #138833 by PCW
No, because its unlikely that the Gecko can drive the termination resistor

I would first check that you can change the state of the index pin in hal by grounding pin 13 (it should be pulled-up to 5V with a 2K resistor on the 7I76E so should idle high)

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08 Jul 2019 07:12 - 08 Jul 2019 07:13 #138841 by thefabricator03

PCW wrote: I would first check that you can change the state of the index pin in hal by grounding pin 13 (it should be pulled-up to 5V with a 2K resistor on the 7I76E so should idle high)


Ok I checked Pin 13 by grounding it and it can be seen changing state in the Hal show.

Where do I look now? I really should of looked into the Gecko 320x more before I brought them, Its becoming a real pain in the ass to get these things to work properly.

Or maybe I am facing problems because the power supply for the reset/error circuit is coming from the drives themselves, would I be better off by wiring the circuit from the spare step and direction pins on the Mesa 7i76e?
Last edit: 08 Jul 2019 07:13 by thefabricator03.

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08 Jul 2019 13:16 #138859 by PCW
Do you have a common ground between the Gecko and the 7I76E?

You should be able to just check the Gecko output voltage relative to 7I76E ground
with a DVM

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08 Jul 2019 21:11 #138894 by thefabricator03

PCW wrote: Do you have a common ground between the Gecko and the 7I76E?


I have checked and No I do not have a common ground, Is that all that my problem is? So wiring the circuit so that is has a common ground should solve the issue?

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