7i76 MPG cant get reading

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4 years 8 months ago #235168 by Kasper-001
7i76 MPG cant get reading was created 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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4 years 8 months ago #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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4 years 8 months ago #235170 by Kasper-001
Replied by Kasper-001 on topic 7i76 MPG cant get reading
i have tried with 5v and field gnd , but that gave no reading 

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4 years 8 months ago #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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4 years 8 months ago #235173 by Kasper-001
Replied by Kasper-001 on topic 7i76 MPG cant get reading
is it jumper settings ?

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4 years 8 months ago #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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4 years 8 months ago #235177 by Kasper-001
Replied by Kasper-001 on topic 7i76 MPG cant get reading
i have it like this

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4 years 8 months ago #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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4 years 8 months ago #235180 by Kasper-001
Replied by Kasper-001 on topic 7i76 MPG cant get reading
so put  T3 pin 23 =gnd  + T1 pin 8=gnd together 

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4 years 8 months ago #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.

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