Huanyang VFD inverter modbus base frequency

First off, thanks to all the devs for the great free software.

I have one Huanyang VFD and connect it to two machines (NOT at the same time).
The motors on the machines have different settings for voltage and base frequency etc.
I can setup and control the inverter from both machines ok using different Linuxcnc setups.

The problem I have is to change the base frequency manually using the VFD buttons (PD04), because the base frequency setting was removed from the hy_vfd command in Linuxcnc.

Can this function be added back in and does anyone know another method (for now) to configure the base frequency via rs485?

This is the commit that removed it:
github.com/LinuxCNC/linuxcnc/commit/b392...183db165113a054a9a23
It looks like the driver never did anything with the data other than make a pin for it.

What does that setting do? (I have a HY VFD, and I have looked in the manual, and it isn't clear)

Thanks for the link.

Yes, I agree the manual isnt clear.

The manual i have states "This parameter must be set according to the rated frequency of operating voltage on the motor's nameplate. Under normal conditions do not change the set value of base frequency at will . If it is
equipped with a special motor this value should be set properly according to the characteristic s o f
the motor's parameters. Otherwise it may cause the damage to the equipment."

The base frequency is normally the inverters continuous maximum frequency that the rated torque is generated.

I have to change PD004 between 50 & 400 hz depending on what motor i'm running using the panel buttons.
If i don't set the value correctly for that motor it won't run when a gcode m3 is commanded.
Its not the end of the world to do it manually, but i think it would been nice to have the full command set available via rs485.

Thanks for reporting this missing feature from the hy_vfd driver.

Do you set PD004 Base Frequency and PD005 Max Frequency to the same value, or are they different?

My reading of the manual suggests they should both be set to the motor's operating (max) frequency, but I'm not sure.

If they're the same, then I'll just make the driver write the --max-frequency value to both PD005 and PD004 (it currently writes it to just PD005). If they're different I'll add a new --base-frequency command-line argument. Seem reasonable?

I'll also add a blurb to the manpage, what do you think it should say about PD004?

No they aren't the same. The max freq, will set a frequency limit. Base frequency sets the motors name plate rating, (running at higher frequencies will use field weakening.)

So the VFD base frequency is set to the motor's rated frequency as indicated on the motor's name plate.

What do you set the VFD's max frequency to?