[ Vfdmod ] An easy VFD control over MODBUS RTU

I think it could be scaled in hal. Each gear has a defined ratio. I might write a custom component to do it but coding the GUI for the selection, I try and avoid. Maybe Lincurve would do it.

It is very common for VFDs to read the input for spindle speed to one decimal point. For example, you'd have to input 3000, for the drive to see 300.0hz.

Todd Zuercher wrote:

It is very common for VFDs to read the input for spindle speed to one decimal point. For example, you'd have to input 3000, for the drive to see 300.0hz.

Todd, thanks, Last night I wrote a component that lets me select the front belt and back belt and retrieve a scaling factor for the given belt combo based on some tacho data I collected earlier. Also paired it with an extension to the PYVCP panel. So I should be able to send the S command to the component which will scale it to correct Hz before sending it to the VFD.

I cheated though and hardcoded all of the ratios in the component.

It took a bit of doing but it worked!


I asked for 1590 rpm and he tacho said it was doing 1599 rpm so close enough as there are lots of rounding and truncation errors.

Bus voltage = 5830.0 V ???

Hi aekhv,

I am using Delta MS 300 VFD and tried to follow your guide but I was not able to establish connection with my VFD.
I have attached my INI and manual. It would very helpful if you could help me regarding the same.