Spindle Homing/Indexing w/external Index Pulse on non-1:1 spindle.

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09 Jul 2021 18:36 - 09 Jul 2021 18:37 #214130 by CNC4Life
Ok guys/gals I’m getting oh so close to calling it good on my machine but I have one last issue. 

The spindle motor on this machine is a Servo motor that is geared up to go from 5k to 7.5k. So the encoder feedback is coming from the motor w/index. But, it has a hal sensor on the spindle shaft. I’d like to use that as an index. 

I have the hal sensor on one of the inputs on my 7i80 but it’s not the canned encoder index input as the motor has that taken. Also the sensor is 24v and the 7i33 doesn’t take accept 24v. 

Thanks 
Last edit: 09 Jul 2021 18:37 by CNC4Life.

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09 Jul 2021 19:56 #214134 by PCW
Is the hal sensor a NPN or PNP (or push-pull) type?

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11 Jul 2021 17:49 #214303 by CNC4Life
It's sourcing, if it was sinking I'd be golden.

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11 Jul 2021 20:04 #214316 by Aciera
I see two possible solutions:

1. Two resistors as a voltage divider and thus no isolation
2. Optocoupling module for electrical isolation

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11 Jul 2021 20:56 #214321 by CNC4Life
Ok, I was wondering if there was a software option. But thank you.

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