Problem with a MESA 7i76
16 Dec 2019 09:32 #152722
by Ameone
Problem with a MESA 7i76 was created by Ameone
Hi everyone,
We've got a problem making a 7i80db-7i76 set-up to work. The 7i76 is connected to 5 motors, with the step/dir signals hooked up to TB2 and TB3. From the software side, we've used a configuration for the MESA boards from the standard LinuxCNC configuration collection. The problem is that only the fifth motor works (connected to TB3), while the other four (connected to TB2) don't. We have already tested the step/dir pins with an oscilloscope: for the TB2 we read constant high signal on the step pins for all cases (without and with jogging), while on the TB3 the signals are correct.
Do you have any idea of what might be the problem?
Thanks in advance.
We've got a problem making a 7i80db-7i76 set-up to work. The 7i76 is connected to 5 motors, with the step/dir signals hooked up to TB2 and TB3. From the software side, we've used a configuration for the MESA boards from the standard LinuxCNC configuration collection. The problem is that only the fifth motor works (connected to TB3), while the other four (connected to TB2) don't. We have already tested the step/dir pins with an oscilloscope: for the TB2 we read constant high signal on the step pins for all cases (without and with jogging), while on the TB3 the signals are correct.
Do you have any idea of what might be the problem?
Thanks in advance.
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- tommylight
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16 Dec 2019 10:26 #152724
by tommylight
Replied by tommylight on topic Problem with a MESA 7i76
Attach hal and ini files so we can have a look.
Check the stepgen.0...... if the numbering is correct.
Check the stepgen.0...... if the numbering is correct.
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16 Dec 2019 13:29 #152728
by Ameone
Replied by Ameone on topic Problem with a MESA 7i76
Here you go.
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16 Dec 2019 13:46 #152729
by tommylight
Replied by tommylight on topic Problem with a MESA 7i76
That looks all god.
What is the output of mesaflash when you do readhmid ?
Might also want to remove these lines from the hal file:
setp pid.x.error-previous-target true
setp pid.x.maxerror .0005
for all 3 axis.
What is the output of mesaflash when you do readhmid ?
Might also want to remove these lines from the hal file:
setp pid.x.error-previous-target true
setp pid.x.maxerror .0005
for all 3 axis.
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16 Dec 2019 13:56 #152730
by Ameone
Replied by Ameone on topic Problem with a MESA 7i76
Ok thanks I'll try and delete those lines. The output is:
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16 Dec 2019 14:50 #152736
by tommylight
Replied by tommylight on topic Problem with a MESA 7i76
That also looks good.
Can you try to change in the hal file:
stepgen number to 8
everything with stepgen.0 change to stepgen.5
everything with stepgen.1. change to stepgen.6
and everything with stepgen.2 change to stepgen.7
that shout put all the stepgens on the J3 header.
Can you try to change in the hal file:
stepgen number to 8
everything with stepgen.0 change to stepgen.5
everything with stepgen.1. change to stepgen.6
and everything with stepgen.2 change to stepgen.7
that shout put all the stepgens on the J3 header.
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16 Dec 2019 15:02 #152738
by Ameone
Replied by Ameone on topic Problem with a MESA 7i76
Ok thanks for the quick feedback. I've tried but nothing happens! The oscilloscope we had in the lab is not working so I cannot test the pins.
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16 Dec 2019 15:04 - 16 Dec 2019 15:05 #152739
by PCW
Replied by PCW on topic Problem with a MESA 7i76
I would try making the step length longer than 1 usec (1000 ns)
1 usec will fail on 95% of step drives
5 usec is usually a better starting place
1 usec will fail on 95% of step drives
5 usec is usually a better starting place
Last edit: 16 Dec 2019 15:05 by PCW.
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16 Dec 2019 15:26 #152741
by Ameone
Replied by Ameone on topic Problem with a MESA 7i76
I've also tried your solution but still no results.
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16 Dec 2019 15:33 - 16 Dec 2019 15:38 #152744
by PCW
Replied by PCW on topic Problem with a MESA 7i76
No outputs from stepgens 0..3 could also be the result of a damaged 7I76
(the first 4 stepgen outputs come from 2 chips, 1 for the + step/dir outputs and 1 for the - step/dir outputs)
Do the direction outputs work? (check + and -)
what are the output voltages?
(the first 4 stepgen outputs come from 2 chips, 1 for the + step/dir outputs and 1 for the - step/dir outputs)
Do the direction outputs work? (check + and -)
what are the output voltages?
Last edit: 16 Dec 2019 15:38 by PCW.
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