7i80-DB + 7I76 - PWM Spindle ?
20 Jul 2019 09:31 #139945
by mjoconr
7i80-DB + 7I76 - PWM Spindle ? was created by mjoconr
Hi All
Firstly thanks for the help over the last year or so !!!
I've been able to use PnCConf to create a config which I could then search and replace to use the 7i80 board.
I now have the XYZ all moving very nicely.
BUT the old BDLC Spindle driver (Tonman bd-1100) does not seem to support an analog signal so I need to have a PWM output.
The old system used mach3 and a couple of parallel ports so I assume the PWM rate was fairly low. The mach3 config page was 2000 steps, step pulse of 2 and direct pulse 15.
Options:
1. I have a friend who could make me a board which converts the analog signal to a PWM
2. A new bit file which uses the 7I76 to generate the PWM the 4th channel stepper ?
3. Use a custom board on one of the other three ports of the 7i80-DB ?
4. Is there a board out there I could use on the extra port on the 7i80-DB ?
Any other ideas ?
Firstly thanks for the help over the last year or so !!!
I've been able to use PnCConf to create a config which I could then search and replace to use the 7i80 board.
I now have the XYZ all moving very nicely.
BUT the old BDLC Spindle driver (Tonman bd-1100) does not seem to support an analog signal so I need to have a PWM output.
The old system used mach3 and a couple of parallel ports so I assume the PWM rate was fairly low. The mach3 config page was 2000 steps, step pulse of 2 and direct pulse 15.
Options:
1. I have a friend who could make me a board which converts the analog signal to a PWM
2. A new bit file which uses the 7I76 to generate the PWM the 4th channel stepper ?
3. Use a custom board on one of the other three ports of the 7i80-DB ?
4. Is there a board out there I could use on the extra port on the 7i80-DB ?
Any other ideas ?
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20 Jul 2019 09:56 #139946
by tommylight
Replied by tommylight on topic 7i80-DB + 7I76 - PWM Spindle ?
Some contradictory information there, PWM and Step/Dir do not go together.
Find the manual for the drive, check what types of control input it can work with.
Analog and PWM drives usually will work with the wrong type of signal, but not correctly, meaning they will spin but the speed control will be broken or erratic.
All Mesa cards can do PWM on the field outputs, but at a low rate. The high speed pins can do very fast PWM.
Warning: puting +- 10V analogue output to a 5V PWM input will most probably destroy that input, especialy the -10V.
Find the manual for the drive, check what types of control input it can work with.
Analog and PWM drives usually will work with the wrong type of signal, but not correctly, meaning they will spin but the speed control will be broken or erratic.
All Mesa cards can do PWM on the field outputs, but at a low rate. The high speed pins can do very fast PWM.
Warning: puting +- 10V analogue output to a 5V PWM input will most probably destroy that input, especialy the -10V.
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20 Jul 2019 09:57 #139947
by pl7i92
Replied by pl7i92 on topic 7i80-DB + 7I76 - PWM Spindle ?
you an go with a 100hz signal
and almost every spindle driver VFD has analog in
so you can just make a low pas filter
or use a Digitaldivice for a 0-10V
cand find any infos of your driver
and almost every spindle driver VFD has analog in
so you can just make a low pas filter
or use a Digitaldivice for a 0-10V
cand find any infos of your driver
loadrt pwmgen output_type=0
addf pwmgen.update servo-thread
addf pwmgen.make-pulses base-thread
net spindle-speed-cmd motion.spindle-speed-out => pwmgen.0.value
net spindle-on motion.spindle-on => pwmgen.0.enable
net spindle-pwm pwmgen.0.pwm => parport.0.pin-09-out
# Set the spindle's top speed in RPM
setp pwmgen.0.scale 1800Attachments:
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20 Jul 2019 10:30 #139948
by mjoconr
Replied by mjoconr on topic 7i80-DB + 7I76 - PWM Spindle ?
There is no manual for the drive available.
I think my belief that the drive supported analog input is incorrect.
A bit file change on the step/dir port would allow it to be a PWM.
Correct a analog signal into a pwm does not work very well.
I think my belief that the drive supported analog input is incorrect.
A bit file change on the step/dir port would allow it to be a PWM.
Correct a analog signal into a pwm does not work very well.
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20 Jul 2019 10:45 #139949
by mjoconr
Replied by mjoconr on topic 7i80-DB + 7I76 - PWM Spindle ?
Does the hardware I've listed have pwmgen as an option ?
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20 Jul 2019 11:55 - 20 Jul 2019 11:56 #139953
by PCW
Replied by PCW on topic 7i80-DB + 7I76 - PWM Spindle ?
As tommylight mentioned, you can do PWM/Dir on the 7I76's Step/Dir outputs with the correct firmware.
There is standard firmware for the 5I25 that does this (pwmgen replace last 7I76 stepgen)
It would be easy to do this on a a7I80DB also
What current firmware are you using?
There is standard firmware for the 5I25 that does this (pwmgen replace last 7I76 stepgen)
It would be easy to do this on a a7I80DB also
What current firmware are you using?
Last edit: 20 Jul 2019 11:56 by PCW.
The following user(s) said Thank You: tommylight
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20 Jul 2019 12:06 #139955
by mjoconr
Replied by mjoconr on topic 7i80-DB + 7I76 - PWM Spindle ?
I'm using 7i80db_16_7i76x3d.bit
Would I change
"num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=00xxxx"
to
"num_encoders=1 num_pwmgens=1 num_stepgens=5 sserial_port_0=00xxxx"
Thanks
Would I change
"num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=00xxxx"
to
"num_encoders=1 num_pwmgens=1 num_stepgens=5 sserial_port_0=00xxxx"
Thanks
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20 Jul 2019 12:22 #139956
by PCW
Replied by PCW on topic 7i80-DB + 7I76 - PWM Spindle ?
Probably:
"num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=00xxxx"
to
"num_encoders=1 num_pwmgens=1 num_stepgens=4 sserial_port_0=00xxxx"
(assuming you are only using the stepgens on the first 7I76)
"num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=00xxxx"
to
"num_encoders=1 num_pwmgens=1 num_stepgens=4 sserial_port_0=00xxxx"
(assuming you are only using the stepgens on the first 7I76)
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20 Jul 2019 12:31 #139957
by mjoconr
Replied by mjoconr on topic 7i80-DB + 7I76 - PWM Spindle ?
So this changes the step4 on TM3 to be a PWM interface ? What should the config look like in the HAL ?
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20 Jul 2019 12:36 #139959
by PCW
Replied by PCW on topic 7i80-DB + 7I76 - PWM Spindle ?
No, you need different firmware for that.
Hardware like stepgens and pwmgens needs to be compiled into the firmware
so you would need a bitfile that has the PWMGen built in
Once its present you can enable 0 to all available instances of the hardware
modules in the hal file
Hardware like stepgens and pwmgens needs to be compiled into the firmware
so you would need a bitfile that has the PWMGen built in
Once its present you can enable 0 to all available instances of the hardware
modules in the hal file
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