Controlling spindle speed on SiegX2 with 0-10v analogue on MX3660 output SOLVED

andypugh wrote:

Have you measured the voltage between the wiper and GND?

As we keep saying, this could be 100+ volts. You need to measure it and report back.

If you connect analogue GND to machine GND and then 100V to the wiper then bad things will happen.

(It doesn't help here that the Leadshine docs are using "GND" in a very vague and probably incorrect way)

OK I'll go measure that. Where is the machine ground that I should measure it from? I 'm on daddy daycare so can't look at the machine but if anyone can look at the photo's in my first post and point me to which connection I need to measure it too that would be fantastic.

Jools

JohnnyCNC wrote:

That's pretty much how it worked on my Sieg X3. I used a Mesa 7i76 rather than a C11 but that part of it looks pretty much the same. The C11 manual says 12vdc or less so I think you will be OK with out worrying about reducing the voltage.

Hi Andy and Johnny

I'm still a bit confused. I went out to the machine this morning and had a look and am unsure which "gnd" I should be measuring to.

From what I can see there are three boards in the control area.

Board 1 is located at the bottom and has an input and output. The input is 240VAC from the mains. I am unsure what the out put is. The output is linked to the power switch for the spindle then goes into board two. There is an earth wire that grounds onto the machine.

Board 2 is located above board one and has the input from the spindle switch into it plus 3 other wires. I think they were marked U V W and they go to the motor. There is a small connector with about five wires in it that looks to go to the motor too. Board 3 is connected to board via a number of soldered pins (maybe 12). Board two shares the common AC GND with board 1

Board 3 This is connected to board two with the soldered pins mentioned above. There is a connector that has ten wires in it that runs up to the 'on/off & potentiometer' housing. I assume this board is DC but am guessing purely as it has the potentiometer attached to it. I cannot see any positive, negative or ground pins on this board

Please can you give anymore help with where I should measure it too.

I attached the quote for Johnny as in it he states he simply connected his control up in the manner I propose to and it was ok so it has just confused me a bit more.

Sorry for being crap with electronics and a burden on your time but I do appreciate all the help you are giving.

Jools

So I just set my voltmeter to 20VDC and measured from the wiper pin to the earthed machine frame and it was between .05 and .12 v.

Is that what you meant?

andypugh wrote:

I am still a bit surprised that the wiper only shows 0.12V above GND< I would expect somewhere between 0 and 5v depending on the position of the knob.

I thought that too as no matter the knob position the voltages stays the same. But just seems to be a different reading each time I take it.

Been a bit of time on this but finally getting round to implementing it and have errors from the HAL.

I read the documentation and added the below to my hal file:

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-14-out
# Set the spindle's top speed in RPM
setp pwmgen.0.scale 1800

then I started up CNC but got an error message below:

Debug file information:
./Jools_mill.hal:114: Pin 'motion.spindle-speed-out' was already linked to signal 'spindle-cmd-rpm'
5010
PID TTY STAT TIME COMMAND
Stopping realtime threads
Unloading hal components

I've attached my hal and ini files and the full report below so if anyone can help that would be great.

Jools

Update:

I ran a new stepconf with the spindle enabled and copied the parts from that hal file to my hal file. seems to work now so will get on with testing it.

Jools

So I've attached it to the potentiometer but it's not working. I've tested the PWM with a 9v battery connected through the 10V input of the MX3660 then attached my multimeter to the 0-10V analog out put and the other battery terminal.

With the spindle turned off the voltage is 7.4v and as I up the spindle speed the voltage goes up to 7.75v and I was expectin it to go from zero to 7.7 ish as the mx3660 drops it by 1.1v.

This was done on a clean install just to make sure it wasn't my original setting on my mill that are causing the problem, I've attached the hal and ini files below.

Any thoughts would be great.

Jools

So this is sorted now.

I just had to remove the old potentiometer and wire it directly and it worked.

Jools