PWM gen

Hi everybody

I'm trying to create a PWM. i try to do this on a 7i66 output.
Is this possible?
I encluded my hal en ini file. In the end i want to use this pwm to control a Spindle.

With kind regards

Sytreca wrote: Hi everybody

I'm trying to create a PWM. i try to do this on a 7i66 output.
Is this possible?
I encluded my hal en ini file. In the end i want to use this pwm to control a Spindle.

With kind regards

I am still a novice this, but looking at the hal file you seem to have these two addf pwmgen.update servo-thread and
addf pwmgen.make-pulses base-thread

Do these need to go between the read and write at the top with the others?

If you are using a 7I66 output you will be limited to the servo thread as the PWM base frequency. This means that to get 1% resolution assumimg a 1 KHz servo thread, you would be limited to 10Hz.

To make filtering easier its probably better to chose PDM rather than PWM

Assuming 1 KHz servo thread, 50% duty cycle PWM at 10 HZ would be 50 ms on 50 ms off, 50% duty cycle PDM would be 1 ms on 1 ms off...

PDM is selected by setting the software pwmgen components frequency to 0

Is it still possible to create a analog signal (0-10V) with this PDM signal?
Because my VFD only accepts 0-10V or 4-20mA.
Or do i need to look for another solution?

Sytreca wrote: Is it still possible to create a analog signal (0-10V) with this PDM signal?
Because my VFD only accepts 0-10V or 4-20mA.
Or do i need to look for another solution?

Both PWM and PDM can be converted to analog voltage by the same low-pass (resistor + capacitor) converter.

(The VFD might well be happy to operate on PWM / PDM without a filter)

Is there any possibility of controlling the VFD with Modbus?

What is controlling the 7i66? Perhaps you could add another smart-serial card, or use another interface?

There is a possibility to connect serial with RS323,RS485 or RS422.
The 7i66 is connected to 7i44 and this is connected to 5i23.
But all the ports on 7i44 are most likely gonna be used up.
On the 5i23 P3 is still available.

Which VFD model? There are some pre-existing HAL components
linuxcnc.org/docs/devel/html/man/man1/gs2.1.html
linuxcnc.org/docs/devel/html/man/man1/hy_gt_vfd.1.html
linuxcnc.org/docs/devel/html/man/man1/hy_vfd.1.html
linuxcnc.org/docs/devel/html/man/man1/mitsub_vfd.1.html
linuxcnc.org/docs/devel/html/man/man1/vfdb_vfd.1.html
linuxcnc.org/docs/devel/html/man/man1/vfs11_vfd.1.html

You can probably arrange to have a high-frequency (up to MHz) PWM generated on one of the 5i23 pins.

Alternatively the 7i83 would do what you want, but seems overkill for an individual analogue output: store.mesanet.com/index.php?route=produc...83_88&product_id=122

It's a pity there isn't a single-channel smart-serial version of the Spinx1
store.mesanet.com/index.php?route=produc...t_id=205&search=spin

It's a commander CD75-750. i don't know with which component this corresponds.