Proto Trak MX3 Retrofit - Which Boards Mesa?

So I have the Servo control pretty well down now. From the start, the 7i84 was recommended for GPIO. I am at the point right now where I want to add Home/Limit Switches and likely some other I/O is the 7i84 a good choice to add on to my existing configuration for GPIO?

Thanks!

Take a look at these, and decide which one is the best fit:
store.mesanet.com/index.php?route=product/category&path=83_88

Hi, everyone.

I've been very busy in last days. I've not shared my progress because, I've not any progress yet .
Because in my country is very difficult to purchase electronics things like MESA products and other stuff like that.
So, after do a some research , here in my city , one friend helps to me to order the 5i25 + 7185s for my project. They have cost around 200 bucks.

So, here I have

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So afert they (the parts) arrived to me, I made some moves.
The first one was on the mill machine. This is:

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It's an old Bridgeport machine and came with Prototrak controller that never worked.

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Some tech snuff:

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So, I've decided to extract all electronics in the blackbox and replace it with a PC with previously installed LinuxCNC on it. And Mesa 5i25 too.


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So, here I'm , I'm still working with the setup, I need to machining some parts, connect some cables, design a monitor stand and machining it too, connect the "brain" with the motor drivers and encoders together , do some research about the configurations of Mesa cards and what HAL means?, and how to use mesaflash?, and then configurate the 7i85s to allow antiphase PWM in 15 Mhz frecuency.

In resume and basically all things that I need to put this baby on the way.

List of the things that i have.

1.- The Bridgeport with its motors and its drivers and encoders.
2.- PC with LinuxCNC installed on it.
3.- Mesa i525+7i85s.
4.- Cables and other stuff.


I was thinking about install Vmware player on Debian and run Windows 7 at the same time with two monitors and use Mastercam on it, but first thing's first.

Where can I start?
How can I configure the MESA 5i25 to work with anti phase PWM?
How can I connect the 7i85s in order to the previous diagrams uploaded?
Jrjones's configuration works for me?
I installed the 5i25, now what?

I really really appreciate your previous help. Just for information, I'm an engineering student and I started this project , because I like to learn more and this project will be implemented in my work and if it works fine, then one machine on my school.

Thank you in advance. specially to PCW and andypugh for they valuable assistance.

Regards and Gracias!!.

vsidon wrote: How can I configure the MESA 5i25 to work with anti phase PWM?

When you say "anti-phase PWM" do you mean pne PWM channel for FWD and one for REV, or do you want a PWM channel and its complement?

You might just need to set output-type to 2 on the PWM channels: linuxcnc.org/docs/2.7/html/man/man9/hostmot2.9.html#pwmgen

The Prototrack drives use a locked antiphase signal that use a single 15KHz PWM channel with differential (complementary)
outputs. Its actually a clever way to use a single signal for direction and magnitude. They also disable the drive when the PWM is not present so they don't start up at full scale output.

50% duty cycle is 0 drive so you use a standard PWMgen but offset the PID output 1/2 way up

vsidon, you should probably beg techrat for his the hal and ini files as a config starting point
since its a rather unusual setup

PCW wrote: Its probably differential PWM in locked antiphase mode (50% = 0 drive),
and I think these drives are disabled by shutting off the PWM

Probably drivable with a 5I25 and a 7I85S with maybe a 7I84 added for GPIO

Hi andypugh.
It's just like PCW says previously "differential PWM in locked antiphase mode" .

According with the schematics by jardomi :


and I can see in the servo driver, it have 2 input signals -pwm and +pwm running at 15Khz (No 15 Mhz sorry for that).And it have 3 more input pins and they're marked like LS (Limit Switch I guess), 5v (circuit power supply) and the inputs for the motor.

So, I suppose that techrat or jrjone have that kind of configuration. I guess that I need some files to "upload" to the MESA 5i25.

Thank you for you quickly response.