mb2hal: trying to control a Siemens Sinamics V20 VFD

Good News Everyone! (that's your Futurama quote for the day...)

I finally managed to reliably and correctly control the VFD! It did take some control word, bitwise fun using wsum, but it works flawlessly in the end. Some (slightly hidden) parameters from the VFD needed tweaking.

In general mb2hal works like a charm once you have the correct register addresses.

Thank you everyone for the help!

Also, is there a repo or something where I could contribute my ini and hal files in case anyone wants to do the same with their Sinamics VFD?

Cheers,

 

You could post them as attachments here in this thread.

hI i have the same VFD and looking to setup control. It would be really helpful if you could share your file.

Thanks,

Hello,

I am really sorry I only see your comment now. You probably have figured it out by now, but I'll upload a copy of the file ASAP.

The configuration mostly works. I just have an isse when closing linuxcnc, the drive goes into a F72 error, which is the watchdog detecting a loss of communication. I could set parameter P2014 to 0 to disable the watchdog, but I would prefer to have that safety. I will look into something to clear the error via modbus at startup.

I have not been able to work on the machine for the past 6 months, but I will update you.

Cheers

Hello,

attached is my config for the Sinamics V20 VFD. With this config and hal file, you should be able to control the speed of the spindle, and get some feedback of actual speed, current and power.

One thing to note for mb2hal is that the ini file has 32 character lines. If you use the /dev/serial/by-id/* path for your serial converter, the path will most likely be truncated and you will fail to communicate. This took me quite some time to figure out.

Note also that when you close linuxcnc, the drive's watchdog, not seeing any more modbus messages, will put the VFD in error state. Currently you have to clear the error state manually on the VFD pannel before restarting linuxcnc. I am looking into a solution using modbus "Fault acknowledge" (40007), but I cannot work with the machine currently.

Please ask questions and PM me if I do not answer

Cheers!

Hello,

for the sake of completeness, here is my latest config. It uses bit 7 of STW with an "edge" component on the machine-is-enabled signal for fault acknowledgement. It clears any fault on the drive when the machine-is-enabled signal passes from 0 to 1.

Note also that an update in mb2hal changed the pin names from mb2hal.XX.00 to mb2hal.XX.00.float or mb2hal.XX.00.int.

This config is now fully functional on my machine.

Cheers,

flawa