Yalang yl620 VFD rs485/modbus communication VFDmod or ClassicLadder

Hi Forum,

I am working on the integration of the Yalang YL 620 VFD with RS485 Modbus and LinuxCNC.
I created 2 github repositories and will continue to work on those as time allows.

github.com/xsnoopy/LinuxCNC-Yalang-yl620...Modbus-ClassicLadder
github.com/xsnoopy/LinuxCNC-Yalang-yl620...s485-Modbus---VFDmod

I think I'm done so far. I would suggest the integration with classic ladder. I think it's more versatile and allows you to use other modbus devices at the same time.

hey i followed your tutorial and managed to get the vfd running with an rs485 usb adapter in axis gui with classicladder, by using the spindle buttons or f11 f12 but the spindle pyvcp panel doesnt show that the rs485 is connected or the spindle at speed indicator and the guage doesnt move when i start the spindle, im glad i got it working with your help from github repo file but the problems i ran into were, in the readme it says to add this at the end of the ini file

loadrt classicladder_rt numS32out=100
addf classicladder.0.refresh servo-thread
loadusr classicladder --modmaster vfd.clp
net spindle-on classicladder.0.in-00 spindle.0.on
net spindle-brake classicladder.0.in-01 spindle.0.brake
net spindle-forward classicladder.0.in-02 spindle.0.forward
net spindle-reverse classicladder.0.in-03 spindle.0.reverse
net spindle-cmd-rpm <= spindle.0.speed-out
net spindle-cmd-rpm-abs <= spindle.0.speed-out-abs
net spindle-cmd-rps <= spindle.0.speed-out-rps
net spindle-cmd-rps-abs <= spindle.0.speed-out-rps-abs classicladder.0.floatin-00
POSTGUI_HALFILE = vfd.hal

but it should be the end of the hal file without the "POSTGUI_HALFILE = vfd.hal" at the end, if you try running linuxcnc with it left in you get an error message, also to get the pyvcp to show in linuxcnc you have to put "PYVCP = vfd.xml" in the "DISPLAY" section of the ini file or it wont appear, does the " POSTGUI_HALFILE = vfd.hal" need to go somewhere else? and i used a waveshare usb to rs485 adapter that was showing up in my /dev/folder as ttyACM0, not ttyUSB* and in the config tab in classicladder there was to ttyACM0 option to select, so i edited the vfd.clp file and changed this line
"MODBUS_MASTER_SERIAL_PORT=/dev/ttyUSB0" to
"MODBUS_MASTER_SERIAL_PORT=/dev/ttyACM0" and when i went into the config it was set to /dev/ttyACM0
i dont know why im getting no feedback from the pyvcp panel, sorry for the rant and thanks for taking the time to post the github repo and tutorial up as without it id had just given up,

Marc, thanks, I corrected the errors in the Readme of the classic ladder. If the vfd.hal file is not loaded correct, the output on the GUI will not work. I think that was your problem. It seems like you figured it out, at least if I look at the manual wiki.printnc.info/en/electronics/vfd/yl620a-rs485 which I believe is written by you as well.

FYI, I am not sure how LinuxCNC comes standard. You say in the manual above:

in the [HAL] section add “POSTGUI_HALFILE = vfd.hal” at the bottom

In my installation In the .ini file It calls this filein this file i load the vfd.hal. I believe this might be a bit more to the LinuxCNC standard. Maybe the pros can talk about the cleaner way of doing this.

 

You mentioned that this adapter works good for you. Can you clarify which version you have/recommend?

FT232RL or CH343G

www.waveshare.com/catalog/product/view/i...485-ttl/category/37/

Hey bender. I have thoroughly tested both adapters. I have both. In the tutorial I put in links and pictures of both and how I configured them. Only 8n1 19200 settings worked. And the ft232rl needs to be switched to 5v not 3v as 3v causes errors. As for the postguihal file. I only use 2.8.4 prompt RT kernel. Not tested any other version of kernel or linuxcnc. I think it loads hal components in order. Which is why my method worked on my version and kernel. Your method probably works on older or newer versions but I've not tested it.

I guess then I get the FT232rl version. Interesting that only the 8n1 19200 work for you. I tried all different settings and it worked for me, currently I run a higher speed since every now and then I can submit a package to the VFD, found out with higher speed I get a package faster through.

LinuxCNC loads the POSTGUI_HALFILE like it says Post GUI. Means, it starts the GUI first then it loads the Hal file. This is necessary because otherwise you would load a hal file and the Pins from the GUI would not be there. Your setup should work with other versions too.

The difference in your set up is that:
Your version:
POSTGUI_HALFILE loads directly the vfd.hal

in my set up:
POSTGUI_HALFILE loads the postgui_call_list.hal
postgui_call_list.hal loads the vfd.hal

I am not sure why there is a postgui_call_list.hal file. I am sure I did not create that, I guess it comes with the LinuxCNC Standard and probably the reason is it supports more then 1 hal file.

I am not sure if you can have multiple POSTGUI_HALFILES loaded directly from the machine hal.

Quick Update! I have found a 12V Power supply in my control unit which created a lot of RS 485 connection issues. I have Tested it briefly with a new power supply and the connection seems to be stable. Further testing ongoing. If it's stable I am planning to integrate more features to the classic Ladder Version as soon as time allows.

Can someone help me? I am reading a register from the VFD which contains the current output frequency. For example 250.0HZ. I can read and display it with classicladder on a pyvcp tab and it shows 2500 it is an S32 value. How can I devide the S32 /10 and display it as a float 250.0 ?

I found some documentation, I think I have to convert the S32 to float, set a 10.0 float variable and then devide it.