How to connect Alarm and Enable on 7i76 boards

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15 Dec 2022 23:15 - 15 Dec 2022 23:53 #259596 by knipknap
My machine has four IHSV57 servos connected to a MESA 7i76, on connector TB2. Each of the servos has Alarm+ and Alarm-, as well as Ena+ and Ena-.
How can I wire those to the 7i76? Can Alarm+- drive the digital inputs? Can Ena+- be set using digital outputs?
 
Last edit: 15 Dec 2022 23:53 by knipknap.

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15 Dec 2022 23:53 #259598 by PCW
Yes, the IHSV57 enable input and alarm outputs are compatible with
the 7I76 I/O:

+24V --> Alarm+
Alarm- --> 7I76 input

7I76 output --> Ena+
Ena- --> GND

Note that you can parallel all 4 enables so they are all enabled at once

7I76 output --> Ena0+,Ena1+,Ena2+,Ena3+
Ena0-,Ena1-,Ena2-,Ena3- --> GND

Likewise, you can parallel the alarms if you don't need to know which axis
has a fault:

+24V --> Alarm0+,Alarm1+,Alarm2+,Alarm3+
Alarm0-,Alarm1-,Alarm2-,Alarm3- --> 7I76 input

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16 Dec 2022 00:36 #259599 by knipknap
Fantastic, thank you for the quick reply! That helps, I will wire it that way.

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16 Dec 2022 05:12 #259610 by rodw
Note in hal, the alarms go to joint.N.amp-fault-in
Also the enableterminals on the drive, usually do the opposite and disable the motors so they need to be enabled on an estop, not on startup.

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16 Dec 2022 11:15 #259626 by knipknap
Got it, thank you!
The following user(s) said Thank You: rodw

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