7i76 MPG cant get reading

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17 Feb 2022 21:12 #235168 by Kasper-001
hey there, 
i have connect hand mpg, but cant get any reading, just  -1 on enc0.count
and its in mode 2
5v and gnd on tb3 for mpg
maybe missing some scale on encoder ?
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17 Feb 2022 21:16 #235169 by PCW
Replied by PCW on topic 7i76 MPG cant get reading
Do you have a common ground between MPG and Field power?

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17 Feb 2022 21:23 #235170 by Kasper-001
i have tried with 5v and field gnd , but that gave no reading 

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17 Feb 2022 21:25 #235171 by PCW
Replied by PCW on topic 7i76 MPG cant get reading
It needs both.

( You must have field GND connected to 5V ground for this to work )

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17 Feb 2022 21:27 #235173 by Kasper-001
is it jumper settings ?

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17 Feb 2022 21:29 #235175 by PCW
Replied by PCW on topic 7i76 MPG cant get reading
No, its your external wiring

The 7I76 MPG inputs need 5V signals relative to field power common

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17 Feb 2022 21:38 #235177 by Kasper-001
i have it like this
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17 Feb 2022 21:41 #235178 by PCW
Replied by PCW on topic 7i76 MPG cant get reading
That will not work because the MPG inputs (on TB5)
do not have a common ground with the MPGs

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17 Feb 2022 21:47 #235180 by Kasper-001
so put  T3 pin 23 =gnd  + T1 pin 8=gnd together 

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17 Feb 2022 21:57 - 17 Feb 2022 22:07 #235184 by PCW
Replied by PCW on topic 7i76 MPG cant get reading
Yes, the field power common and 5V common must be connected
if your  MPG runs from the 5V supply.
Last edit: 17 Feb 2022 22:07 by PCW.
The following user(s) said Thank You: Kasper-001

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