parallel port closed loop
29 Oct 2010 11:57 #4958
by billykid
parallel port closed loop was created by billykid
Hello everyone, I'm trying to etch configuration with a servo motor and encoder with 512 pulses per revolution, and seems to be going very well.
by mounting two parallel ports I wanted to know the maximum number of rpm with 1024 encoder pulses and the maximum speed using the mesa 5i20
Regards Mauro
by mounting two parallel ports I wanted to know the maximum number of rpm with 1024 encoder pulses and the maximum speed using the mesa 5i20
Regards Mauro
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29 Oct 2010 13:43 - 29 Oct 2010 13:46 #4960
by andypugh
Replied by andypugh on topic Re:parallel port closed loop
Maximum speed of encoders or motors will not be limited by the 5i20, but by the motors and other parts, I imagine.
The max pulse rate with the Mesa cards is 6Mhz normally, and 20Mhz if you turn the filter off. For a 1024 count encoder that means 360,000 rpm in slow-mode and a million rpm in fast mode.
(23:32 here: www.linuxcnc.org/irc/irc.freenode.net:6667/emc/2009-02-16.txt )
With a parallel port it depends on the base thread period, but assuming 20,000nS and a 2:1 sample ratio you would be looking at about 1500rpm. (which is possibly OK, it's not desperately slow)
The max pulse rate with the Mesa cards is 6Mhz normally, and 20Mhz if you turn the filter off. For a 1024 count encoder that means 360,000 rpm in slow-mode and a million rpm in fast mode.
(23:32 here: www.linuxcnc.org/irc/irc.freenode.net:6667/emc/2009-02-16.txt )
With a parallel port it depends on the base thread period, but assuming 20,000nS and a 2:1 sample ratio you would be looking at about 1500rpm. (which is possibly OK, it's not desperately slow)
Last edit: 29 Oct 2010 13:46 by andypugh.
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29 Oct 2010 18:51 #4968
by billykid
Replied by billykid on topic Re:parallel port closed loop
thanks, actually 1500 rpm are not so few ... with my driver dc in step/dir mode move to 4800 mm minute.
Regards Mauro
Regards Mauro
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03 Nov 2010 15:37 #5058
by billykid
Replied by billykid on topic Re:parallel port closed loop
I tried the following configuration: 77 volt 7 amp motor
1024 cpr encoder scale base period 20000 1024 4 mm round.
runs really well just do not exceed 2700 mm minutes
about 700 rpm. I have to change something to go to 1500 rpm?
Regards Mauro
1024 cpr encoder scale base period 20000 1024 4 mm round.
runs really well just do not exceed 2700 mm minutes
about 700 rpm. I have to change something to go to 1500 rpm?
Regards Mauro
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03 Nov 2010 15:47 #5059
by andypugh
Replied by andypugh on topic Re:parallel port closed loop
billykid wrote:
Any idea what is limiting the speed?
What is the max velocity of the axis in the INI file, for example?
I tried the following configuration: 77 volt 7 amp motor
1024 cpr encoder scale base period 20000 1024 4 mm round.
runs really well just do not exceed 2700 mm minutes
about 700 rpm. I have to change something to go to 1500 rpm?
Any idea what is limiting the speed?
What is the max velocity of the axis in the INI file, for example?
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03 Nov 2010 17:19 #5062
by billykid
Replied by billykid on topic Re:parallel port closed loop
80 inch minutes more than 4500 mm min .... just dropping a base_period can turn higher.
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