Hello
I´m need a little help with my pokeys and a vfd.
When i want to use the pwm output from my pokeys to the vfd do i need a pwm to voltage converter?
Or give it another solution for connecting this?
And when i want use the output of digital frequency from my vfd to display the right values What do i need for this feature?


MFG
matthias

Hi, Matthias

Which VFD are you referring to?

Regards,
Matevž

Its a huanyang HY02D223B
It has a RS 485 2 wire connection and a Multi Input Terminal

On the Multi input i can connect the pokeys to Start,stop,reset and 3 predefined speeds.
I have read about a rs 485 to usb converter with this and a plugin i can control the spindle with all the features.
And my question is how can i connect the pokeys to the vfd to controll the spindle with the rpm too?
Is this Possible?

If the VFD accepts analog input, then you can use PoKeys's PWM output to generate analog voltage reference.

The vfd have two analog inputs.

1.Analog Voltage Freqency reference Input
2.Analog Current Frequency Reference Input
The vfd accepts 5 or 10 volts  or 0-20ma or 4-20ma
The pokeys analog output is at 3,3V

When i connect to the volt input do i need a pwm to voltage converter?
Can i use the 0-20mA Current Frequency Reference input directly from pokeys?
or do I need in each case external components?

Can the analog inputs be scaled in VFD settings? What range of VFD frequencies will you be using?
Namely, if you can setup VFD in such a way that 3.3 V on the frequency reference input means maximum spindle RPM that you need, then you only need to connect an RC filter (resistor and capacitor) to PoKeys output and connect the output of the filter directly to VFD.
If you really need 0-5V range, then you can put a 74HCT125 line driver (or some level converter IC), connected to 5V supply. This will convert 3.3V digital signals to 5V digital signals - you will need to put an RC filter to the output of this IC and the output of the filter to VFD.

Ok Without any External Components i dont come on.

I have found a drawing of a 3,3V pwm to 0-10V digital can i use this?

This will do exactly what you need.

ok then I build me as a part.

When i read the features of the huanyang VFD Plugin there is it possible to read the real RPM and show this on the dro in mach3
Is it possible with the pokeys to read the real RPM from the VFD?
The VFD has a output terminal of digital frequency 0-10V but i dont know how to connect this to the pokeys and i dont know if its the right.

The spindle speed display is planned for Mach4 PoKeys plugin.