pwm gen 7143 and 7137com

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09 Jan 2015 05:01 - 09 Jan 2015 05:08 #54805 by andradela
Hi all.
I'm trying creat a pwm gen on pncconf, but i found a problem, pncconf creat a output pwm in the pin 7. The pin 7 is a input on 7i37com. I changed that pin in hal file to pin 16, but isn't works. Emc doesn't run.
Show that fault.
Parameter or pin hm2_7143.0.gpio.0016.invert_output not found
Last edit: 09 Jan 2015 05:08 by andradela.

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09 Jan 2015 05:10 #54807 by andradela
Replied by andradela on topic pwm gen 7143 and 7137com
Follow the hal file an debug file.

File Attachment:

File Name: my_LinuxCN...08-2.hal
File Size:11 KB


File Attachment:

File Name: errors.txt
File Size:102 KB
Attachments:

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09 Jan 2015 06:10 #54810 by PCW
Replied by PCW on topic pwm gen 7143 and 7137com
A couple of things...

1. Hardware PWM outputs are on fixed pins. so if you want a PWM output on GPIO16 you must have a bitfile
that already has a PWM output there.
2. Hardware PWM is not very useful on 7I37 outputs because they are fairly slow, in any case you would
want a slow PWM rate if you expect decent linearity, probably 1 KHz or below
3. If a very slow PWM rate is OK (say 10-20 Hz) you can use the software PWM generator and wire it in HAL to GPIO 16

What is the PWM for?

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09 Jan 2015 06:30 - 09 Jan 2015 06:31 #54811 by andradela
Replied by andradela on topic pwm gen 7143 and 7137com
To control a vfd spindle motor. I will use a pwm to 0-10v converter.
Last edit: 09 Jan 2015 06:31 by andradela.

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09 Jan 2015 07:04 #54812 by andradela
Replied by andradela on topic pwm gen 7143 and 7137com
1khz I believe will works fine.

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09 Jan 2015 20:10 #54819 by andypugh
Replied by andypugh on topic pwm gen 7143 and 7137com

To control a vfd spindle motor. I will use a pwm to 0-10v converter.


Mesa make a device for this: store.mesanet.com/index.php?route=produc...spinx&product_id=205

But a capacitor and resistor can work too. (depending on the nature of the IO pin, it needs a degree of push-pull capability).

I use an ACPL chip directly connected to a 7i43 output pin to get the required current-source / current-sink behaviour.
picasaweb.google.com/1081645046564043805...#6013253785596056210

You would need a bigger cap than shown for a 1kHz PWM.

Which VFD are you using? Some of them can be directly controlled by the serial port / modbus.

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09 Jan 2015 20:29 #54820 by andypugh
Replied by andypugh on topic pwm gen 7143 and 7137com

Hi all.
I'm trying creat a pwm gen on pncconf, but i found a problem, pncconf creat a output pwm in the pin 7. The pin 7 is a input on 7i37com.


I _think_ that if you set the number of PWMgens to 3 in pncconf then one of them will end up on an output pin of the 7i37.
This is a bit wasteful of 7i37 pins, as some of the 7i37 Inputs get claimed by PWM generators that are not being used.

It _might_ be better to use a step generator and frequency to voltage conversion to control the VFD.

Making a special 7i43-200 firmware that has a PWM output on the 7i37 pin of your choice is something that even I can do, but not until sunday. In the meantime (and if you are not using the 7i37 inputs on the pins that get "claimed" by PWMs 0 and 1) then try 3 PWMs to get things working.

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09 Jan 2015 23:38 #54824 by andradela
Replied by andradela on topic pwm gen 7143 and 7137com
Sinamics g110. Siemens

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10 Jan 2015 00:22 #54825 by andypugh
Replied by andypugh on topic pwm gen 7143 and 7137com

Sinamics g110. Siemens


That appears to have the option of RS232 control with a separate connection kit, but that is probably hard to get hold of.

I was wondering if the drive had an option to take pulse (stepgen) frequency as input, but it appears not.

One very easy way to convert a step/dir pulse to PWm to control an inverter would be an Arduino.
An interrupt that triggers on the rising edge of a digital input could simply measure how many clock ticks have happened since the last pulse, and set a PWM output accordingly.
You can get an Arduino Nano for <$10 from eBay. They make it barely worth building a breadboard circuit any more.

However, it should be possible to use the Mesa card PWM, it just needs a bit of firmware manipulation.

What daughter card is on the other port? Perhaps it would make sense (if a custom firmware is being built) to move the PWMgen pins to that port.
The following user(s) said Thank You: andradela

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10 Jan 2015 02:58 - 10 Jan 2015 03:01 #54838 by andradela
Replied by andradela on topic pwm gen 7143 and 7137com
Another port i use a custom board, I built my own.
Last edit: 10 Jan 2015 03:01 by andradela.

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