Mesa 7i76e+7i77 encoder limitation
19 Jan 2024 05:57 #291093
by endian
Mesa 7i76e+7i77 encoder limitation was created by endian
Hello folks,
I am facing the problem with loosing velocity value from Mesa 7i77 card which is plugged to P1 of Mesa 7i76e. I have tried each channel of board and each are behavior same same... Encoder is Heidenhain quadrate full TTL 5000 increments per rev means 4*5000 = 20000 in encoder resolution... When the spindle speed rised over 1500rpm(equals ((1500/60) * 20000) = 0,5MHz), velocity feedback in encoder component of 7i76e is disappearing and thats all.. I checked wiring and shielding the cables. Each cable have separate shielding connected to the ground....
I am think there should be problem with encoder limit frequency. I can not find any informations about this limitation in the any Mesa manual. I there any limitation setup in the mesa ?
thanks for any suggestions
Regards Slav
I am facing the problem with loosing velocity value from Mesa 7i77 card which is plugged to P1 of Mesa 7i76e. I have tried each channel of board and each are behavior same same... Encoder is Heidenhain quadrate full TTL 5000 increments per rev means 4*5000 = 20000 in encoder resolution... When the spindle speed rised over 1500rpm(equals ((1500/60) * 20000) = 0,5MHz), velocity feedback in encoder component of 7i76e is disappearing and thats all.. I checked wiring and shielding the cables. Each cable have separate shielding connected to the ground....
I am think there should be problem with encoder limit frequency. I can not find any informations about this limitation in the any Mesa manual. I there any limitation setup in the mesa ?
thanks for any suggestions
Regards Slav
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19 Jan 2024 12:04 #291108
by PCW
Replied by PCW on topic Mesa 7i76e+7i77 encoder limitation
Did you try turning off the encoder digital filter?
setp hm2_7i76e.0.encoder.XX.filter false
(Where XX is the spindle encoder channel)
There's probably a:
setp hm2_7i76e.0.encoder.XX.filter true
already in your hal file
This is described in the hostmot2 manual (in the encoder section)
setp hm2_7i76e.0.encoder.XX.filter false
(Where XX is the spindle encoder channel)
There's probably a:
setp hm2_7i76e.0.encoder.XX.filter true
already in your hal file
This is described in the hostmot2 manual (in the encoder section)
The following user(s) said Thank You: endian
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19 Jan 2024 19:00 #291138
by endian
Replied by endian on topic Mesa 7i76e+7i77 encoder limitation
thanks a lot, yes that I found, but I have not thinking about filtering of signal that can cause the missing speed problem...
What is value of digital filter please? It should be some Hz value there... I can not find in the component description filter true/false value, but it could blinked in my head for sure...
Thanks for your attention, we should to learn every day and every age...
What is value of digital filter please? It should be some Hz value there... I can not find in the component description filter true/false value, but it could blinked in my head for sure...
Thanks for your attention, we should to learn every day and every age...
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19 Jan 2024 19:35 #291141
by PCW
Replied by PCW on topic Mesa 7i76e+7i77 encoder limitation
The encoder filter setting is described in the hostmot2 manual page
man hostmot2
Actually there's always a digital filter applied but when the encoder filter is true,
the filter time constant is 15 encoder sample clocks but only 3 encoder sample
clocks when filter is false. You can also increase the encoder sample rate but
this is limited as the manual mentions.
Did setting the encoder filter false solve your issues?
man hostmot2
Actually there's always a digital filter applied but when the encoder filter is true,
the filter time constant is 15 encoder sample clocks but only 3 encoder sample
clocks when filter is false. You can also increase the encoder sample rate but
this is limited as the manual mentions.
Did setting the encoder filter false solve your issues?
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19 Jan 2024 20:22 #291144
by endian
Replied by endian on topic Mesa 7i76e+7i77 encoder limitation
yes it helped... I finally found the
hostmod
manual and I will have very nice night reading...
thanks for your help... Whole stuff working and now I am going to solve PID with gearchange component...
regards Slav
thanks for your help... Whole stuff working and now I am going to solve PID with gearchange component...
regards Slav
The following user(s) said Thank You: tommylight
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