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Thanks for the schematic. I wish I had found this a while ago.

I like how you use isolated and regulated voltage. I need to see if I can find a single component that does that.

> The torch is negative, ground is positive.

Ah right. I forgot that. Is that why U4 is inverted?

I took a stab at dissecting your schematic. This is what I got:

Voltage source
5V: Common 5VDC power source
U1: 1W Isolated DC-DC 9V out; Isolation 1.5k VDC/min
C3: Decoupling
U5: 5V LDO voltage regulator
C3: Decoupling
VCC_ISO: Isolated 5VDC

Input stage
R7,R9: Voltage divider, 38:1 ratio
D1: Limit input to max 5V
R6: Current limiting
U4: Voltage buffer (inverted ?)
R8: ?
R5: Current limiting?
C4: Decoupling?
C5: Decoupling?
U3: ADC with 12C output
R4: Pull-up resistor
R5: Pull-up resistor
C2: Decoupling?

Output stage
U2: I2C isolator; Isolation 2.5-kVrms
C1: Decoupling?
R1: Pull-up resistor
R2: Pull-up resistor

At a first glance, I think you have the wrong GND
connected to  the 7I96S spindle analog out. It should
be the potentiometer GND not the digital input GND.

mitsubishi cnc never had step/dir controled drives...
meldas 3 had a parallel differential bus
meldas 5/6 is serial differential
meldas 7/8 is optical
i can interface them all..

My intention with the TVS was to limit input voltage to 250V. The ADC expects 0-5V range, and voltage division is 50:1, so anything above 250V is out of range.

In reality 250V is way high for a cutting voltage. I just came up with it by working backwards from the ADC voltage range.

Does that make sense?

Optoisolators are a good idea. I was planning on the TVS limiting the voltage, but I guess it's always possible that someone would hook this board up to a HF start torch.

X1 just has 5V power and rs-485 YIO bus...
 

What CPU do you have? How many cpus does it report?
what does echo $(nproc) say?
Its possible you are trying to isolate a nonexistent core

Hakan wrote:

One would like to have a speed output from the drive but there isn't one.

Should be possible to get rps or rpm in the frequency output
by setting proper scaling factor in frequency-scale. 
Have not tried it, though.

Should be possible

Hello guys,
im new in Linux CNC i wat to connect Linux CNC with my Spindel+YL620a Frequency Converter
via a 7i96s and failed. I dont understand what im doing wrong.....

I connectet the Components like the Picture.

Added this to the Hal
setp hm2_7i96s.0.pwmgen.00.output-type 1
setp hm2_7i96s.0.pwmgen.00.scale [SPINDLE_0]OUTPUT_SCALE
net spindle-vel-cmd-rpm => hm2_7i96s.0.pwmgen.00.value
net spindle-enable => hm2_7i96s.0.pwmgen.00.enable

Added this to the ini
MAX_OUTPUT = 24000.0
OUTPUT_SCALE = 24000
OUTPUT_MIN_LIMIT = 0
OUTPUT_MAX_LIMIT = 24000

Changed the Frequency Converter Settings like in the Picture.

Im grateful for any help or tips.

Thaks in advance
Tach0
 

Which series of drives do you have? If they are fibre-optic controlled, Dmitry has the cleanest, fastest solution to controlling the drives over the SSCNET III/H control fibres.

If they are copper controlled network drives, then Dmitry has a control for that as well, but you can also run the MESA cards for step/direction interfaces.

I thought I'd added my HAL file, guess not.

The M-code files still have remnants of my first attempt at switching the drive (internally) between velocity and position modes as in @Aciera's example.  That stuff is commented out; just ignore it if you aren't switching your drive.

If you ARE switching your drive internally, you'll probably want stuff like "M66, check for drive mode" in your M-code file.

Good job!

I've renamed my m-codes from the original example, and due to some jitter (servo dithering) when the motor/drive is in position mode I just leave the drive in velocity mode.  LCNC is switched between spindle/orient/positioning. 

My M-codes and main spindle HAL file are attached for your review; maybe they can help.

There is quite a bit commented out, but the gist of it is M254/M255 are used to switch between C-axis and spindle mode, using spindle-orient to realign the spindle before re-connecting the C-axis encoder.

M102 & M103 are 'backstage' M-codes used to adjust stepgen & c-axis PID settings (and disconnect index-enable) in a way you can't (I think) do from inside a normal .ngc g-code file.

Let me know if anything is really unclear.

That does not look bad but the max servo thread time shows the issue
( 1624528  clocks at 1.7 Ghz is ~.95 ms)

It may be that the CPU/BIOS-Setup are simply not capable of the needed
network performance for a 1 KHz servo thread.

A last ditch is to use a newer kernel as the 6.1 kernel in the LinuxCNC distribution
is fairly bad latency wise.

7.0.0-rc1-rt1 #1 SMP PREEMPT_RT 

Is the current one


 

whoops, sorry about that.
PING 192.168.1.121 (192.168.1.121) 56(84) bytes of data.

--- 192.168.1.121 ping statistics ---
60000 packets transmitted, 60000 received, 0% packet loss, time 60060ms
rtt min/avg/max/mdev = 0.095/0.118/0.250/0.001 ms

The spikes in following error were indeed caused by graphics. It settled down when I removed one of 2 screens I had attached. Realtime delay error persists though.

Looks like you are pinging the host rather than the 7I97

One would like to have a speed output from the drive but there isn't one.

Should be possible to get rps or rpm in the frequency output
by setting proper scaling factor in frequency-scale. 
Have not tried it, though.