A2-VFD

[cncnutz]

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Caution: Before any VFD can be used it must first be configured correctly to work with your spindle.
Incorrect spindle configuration can lead to damage of the Spindle, the VFD or both.
This diagram is based on the default configuration shown in the VFD documentation.
Please be aware that changes made to configuration and link on the main board may make this drawing incorrect.


Trouble Shooting your VFD

VFD and Spindle Testing

docs.masso.com.au

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[bu3tts]

Hi there!

What kind of cable do you recommend for connecting the VFD
Is a shielded cable 4 x 0,50 mm2 appropriate for this application?

 

[Leon_roto-art]

if between Masso and VFD then yes that should be fine. if it is between VFD and motor then it depends on the maximum power draw of the motor

 

[bu3tts]

Thank you.

 

[bu3tts]

Since the spindle and VFD is installed that way it works. But there is a problem.
The spindle speed that is shown on the VFD is always way faster than the setting in the GCODE.
Usually, I have to dial down the spin speed to 65% to get the right RPM on the VFD.
It's a work around. Something I have to remember every time I start a job on the machine

Is there a proper way to calibrate the the RPM of the VFD to MASSO or the other way around?

I also double checked if MASSO and the VFD was set to 10 V input. Because that would be the obvious mistake if the spindle runs twice as fast.

Any help would be very much appreciated!

Best regards from Germany,

Oliver

 

[Leon_roto-art]

Most probable cause off this kind of problem is a minimal rpm setting in the VFD. Masso runs from 0 to 18000. VFD could for example run from 5000 to 18000. So anything set less then the maxium rpm set in masso will have a greater output. This is only one off multiple options so please check the following:

1. check max output masso to VFD maxium output
2. check min output masso to VFD mininal output

 

[cncnutz]

It sounds like the VFD is not configured correctly.
Start by confirming that MASSO is outputting the correct voltage.
Measure the voltage on spine control pin 1
At 9000rpm you should see 5 volts.
Then measure the actual RPM of the spindle at 9000 RPM. Don't rely on the VFD screen as the problem might be the displayed speed and not the actual spindle speed. Incorrect VFD settings can read the wrong speed even though the actual speed is correct.
You first need to figure out what the problem actually is so you can figure out what needs to be fixed and where to look.
Cheers Peter

 

[bu3tts]

Thanks to both of youI will get myself a RPM meter and check it.

 

[cncnutz]

Did you confirm the voltage output from MASSO was correct?
If you have confirmed that the MASSO voltage output is correct have you checked your VFD settings?
What s the speed and frequency marking on the spindle.
What is the frequency marked on the spindle case?

For example if it is an 18000 RPM 300Hz spindle and the VFD is set to 400Hz then the speed will be wrong by about 75%

Did you connect Spindle control Pin1 it to the right input on the VFD? I see there is a 5 volt input as well which would be a 50% error if you used that instead.
Your 65% speed error is right in the middle of these two possibilities.

Cheers Peter

 

[bu3tts]

Hi Peter and Leon,

The machine is located at a friends house. I don't have daily access.
This is why I am not able to reply immediately.
So please be patient I will report back!
What you said about the frequency of the spindle versus the VFD makes sense.
I will check this ASAP. I will ask the guy to make a photo of the technical data written on the spindle.
The RPM meter is on its way from Amazon.
There is also a 5V terminal, but it is connected to 10V.

Regards,

Oliver