Maximum Step Pulse Frequency?

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safeairone

safeairone
Setting up Masso G3 + Gecko G320X Servo Driver + KL34-180-72 servo with AMT102X encoder on the bench prior to installation on my machine.



Part of that process outlined in the Gecko G320X user manual is determination of the optimal encoder line count setting for the AMT102X encoder. This is the only piece of the puzzle I'm missing. If my understanding is correct, line 4 in the excerpt from the G320X manual shown below should be the maximum step pulse frequency the Masso G3 is capable of putting out. Is this correct? If so, where do I find this information?


To determine the optimal encoder line count, please follow the instructions below.​

1.) Determine the motor s no load RPM (4000)
2.) Calculate rated RPM as 80% of no load RPM (3200)
3.) Divide (#2) by 60 to get revolutions per second (53.33)
4.) Determine the CNC program s maximum step pulse frequency (in Hz) (???)
5.) Divide (#4) by (#3), which will give you the maximum counts per revolution
6.) Divide (#5) by 4, which will give you the max line count
7.) Pick the first standard line count below (#6)​



Thanks for any insight anyone can shed on this!



--Mark
 
breezy

breezy

Moderator
@safeairone

Mark,
maximum step pulse frequency the Masso G3 is capable of putting out. Is this correct? If so, where do I find this information?
Click to expand...

I have seen a figure quoted in the documentation, since the reorganisation of the documentation I can't find it. But I noticed that on the Axis Calibration page the photo shows 106.7 kHz at the top, now that is the calculated value for the sample being setup. So grab a nominal value of say 100 kHz to do an initial setup and when MASSO Support comes online with the correct value you can quickly make the adjustment to the driver.

Hope that helps?

Regards,

Arie.
 
S

safeairone

safeairone
Hi Arie--Thanks. We think alike as this is exactly what I did--took the arbitrary value shown in the axis calibration screenshot, just to have a number to use in testing the whole setup. All in all, it was incredibly simple to get everything hooked up and to get believable movement out of the servo on the bench. Just hoping to optimize everything while I await the arrival of the wire harnesses I've ordered.

I suspect the frequency shown in the calibration screen grab is probably not close to the maximum the Masso is capable of putting out; I'm surprised that there's not a G3 datasheet or something similar specifying this somewhere in the documentation.
 
evermech

evermech

evermech
If I recall correctly it is 110khz max pulse frequency, which is not a particularly large number when using servos.

Guy
 
S

safeairone

safeairone
Quote from evermech on May 4, 2020, 1:28 pm

@safeairone

Im thinking the recommendation is to not use all of the available hertz as it may over tax the Masso. Maybe the G3 handles it better.

Guy
Click to expand...

I don t necessarily think I ll be using the max output, but rather just using that max output number in the equation to optimize the encoder PPR selection.
 
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