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7i77 Servo Enable

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13 May 2021 17:18 #208743 by MrSpeaky
7i77 Servo Enable was created by MrSpeaky
Hello dear forum users

Ive nearly completed my wiring diagramm for my Mill retrofit
but i am not so sure about how to correctly wire my servo drivers to my 7i77



how would you wire the four analog servo pins
aout
gnd
ena+
ena0-

i would kindly appreciate any help
thank you
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13 May 2021 20:52 - 13 May 2021 21:00 #208754 by chris@cnc
Replied by chris@cnc on topic 7i77 Servo Enable
I would try
aout => 42
gnd => 41
ena+ => 36
ena0- => 3
Last edit: 13 May 2021 21:00 by chris@cnc.
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13 May 2021 20:58 #208755 by MrSpeaky
Replied by MrSpeaky on topic 7i77 Servo Enable
Thank you know this is what i thought about too but i wasnt sure cause of com + thank you know i can be more sure of not killing my boards

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13 May 2021 20:59 - 13 May 2021 21:01 #208756 by bevins
Replied by bevins on topic 7i77 Servo Enable
Check you can move manuall and the encoder is moving in the right direction before enabling. If you didnt already know that.
and try putting a 1.5v battery on pins 41 and 42 after manually enabling. Just a little safeguard.
Last edit: 13 May 2021 21:01 by bevins.

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13 May 2021 21:14 - 13 May 2021 21:19 #208757 by chris@cnc
Replied by chris@cnc on topic 7i77 Servo Enable
I edit ena+ and ena0.
You should look online in servodriver to check i/o bits
Last edit: 13 May 2021 21:19 by chris@cnc.
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13 May 2021 21:26 - 13 May 2021 21:27 #208759 by chris@cnc
Replied by chris@cnc on topic 7i77 Servo Enable
If ena0 => 37 and ena+ => 3 will happend nothing. On Second side is no com+
Last edit: 13 May 2021 21:27 by chris@cnc.
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14 May 2021 02:21 #208777 by Benb
Replied by Benb on topic 7i77 Servo Enable
The last suggestion by Chris@cnc is correct .
From the diagram, the inputs are sourcing type ie negative logic.

ENA0- => 37 (neg of PS)
ENA0+ => 3 (DI-0)
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14 May 2021 11:31 #208793 by MrSpeaky
Replied by MrSpeaky on topic 7i77 Servo Enable
Ive found another picture in the manual that might help
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14 May 2021 13:27 - 14 May 2021 13:28 #208801 by bevins
Replied by bevins on topic 7i77 Servo Enable
This is my suggestion. I always do it like this.

Put power on pins com on pin 37, + on pin 36,
net Servo-enable machine-is-on output-pin

Coneect a relay to ouput pin and run pin 37 to one side of N.O relay and other side to pin 3.
That should enable your drive. I always use mesa boards like this and never had an issue.
Last edit: 14 May 2021 13:28 by bevins.

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