LinuxCNC-Yalang-yl620-VFD-rs485-Modbus-ClassicLadder

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About

This repository should help users to integrate the YL620 VFD using Modbus RS485 into LinuxCNC. This integration is based on ClassicLadder. In my other repository I am using VFDmod, but I would suggest stay as much as you can with standard components of LinuxCNC. I believe as well that with ClassicLadder you should be able to use other Modbus devices at the same time. It seems to be possible, to use the X1-X8 Terminals of the VFD as field Inputs. But since I don’t have a use for that, I haven’t bothered with it. Leave a pull request and I might integrate that as well. For questions it's best to use the LinuxCNC forum https://forum.linuxcnc.org/47-hal-examples/44328-yalang-yl620-vfd-rs485-modbus-communication-vfdmod-or-classicladder The VFD RS 485 Signal is very noisy. I used this adapter which works best for me https://amzn.to/4886Km0 (Amazon affiliate link)

How to

• Set up the VFD drive to receive signals via Modbus.
  • P00.01 = 3 Start/Stop command source RS485
  • P03.00 = 4 for 19200Bps
  • P03.01 = 1 RS485 slave address 1
  • P03.02 = 2 Data transfer format 8 bit data, 1 stop bit, no parity
  • P07.08 = 5 Frequency source selection RS 485
• Connect the VFD with your USB Rs485 adapter.
• Download vdf.hal vfd.clp and vfd.xml to your linuxcnc/config/NAME folder. Replace NAME with the name of your machine.
• Add this to your machine hal file at the end

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

• Add this to your machine postgui_call_list.hal file at the end

source vfd.hal

• Set up classic ladder

Changelog

• 02. December 2023 Corrected some errors in the Readme file.