Build Thread - Avid/Teco/Router

[needforfeeds]

ok so I'm a little further along.

what i have found is that when i command M3 S8000, not only do i get 11900rpm (via Tachometer) but the VFD display shows 198Hz (it should be 133.3Hz for 8000rpm, right?) and a DC multimeter connected to AVI/AGND shows 4.98v (it should be 3.33v for 8000rpm, right?)

Could unshielded wire on 0-10v be the cause of this? also a floating ground between my VFD and Acorn?

-I plan to replaced my 0-10v wire with a 20AWG shielded wire with drain going to acorn side COM.
-I have my VFD and Acorn grounded in separate boxes but they are not grounded together, I will connect the two boxes with ground wire.

Do you think this could improve the voltage discrepancy?

I am guessing there is no way to adjust the analog output scaling in CNC12 or the Acorn Wizard to ensure 8,000 RPM outputs ~3.33V? Is there a specific gain or offset setting I can modify?

any advice is appreciated.
thank you

[suntravel]

Machine and cabinets must have a common GND
Shielded twisted pair wire for the 0-10V
Snubber for 0-10V :

viewtopic.php?f=60&t=5364&hilit=10V+flu ... g&start=20

Uwe

[ShawnM]

As Uwe stated, everything must be common grounded, to a copper bus bar is best practice. And post a current report so we can see how you have the spindle setup in the Wizard. To verify your VFD settings we’d need a link to the manual for your VFD. Not sure why you have programmed a custom V/F curve. The VFD should be 0-400 hertz and controlled by Acorn’s 0-10 volt signal.

Again, post a current report with your questions.

[needforfeeds]

Thank you.
Here is a fresh report.

-There IS a common ground between my two boxes and each box has its own ground bus bar, my mistake.
-My 0-10v wire is not shielded or grounded, i have a 20AWG shielded arriving tomorrow.
-I ordered a 0.1uF ceramic capacitor arriving tomorrow.

My VFD is Teco L510 (https://www.tecowestinghouse.com/Manual ... manual.pdf)
The reason why I made a custom V/F curve is because in the settings, (parameter 01-00 - page 59 in .pdf manual) the presets are for either 50Hz or 60Hz motors. because my spindle is 400hz i use parameter 01-07 (custom) and then i can set Max, Mid2, Mid1, min voltage % Hz.

These are the updated parameters of my v/f curve.

01-00 = 7 ; Custom V/F curve
01-01 = 220.0 V ; Max voltage
01-02 = 400.00 Hz ; Max frequency
01-03 = 100.0 % ; Max voltage output at max freq
01-04 = 300 Hz ; Mid2 frequency
01-05 = 75 % ; Mid2 voltage
01-06 = 200 Hz ; Mid1 frequency
01-07 = 50 % ; Mid1 voltage
01-08 = 50Hz ; Min frequency
01-09 = 13.7% ; Min voltage

Any help on this would be appreciated. i should have the 0-10v shielded wire tomorrow.

Thank you!

[ShawnM]

I believe that is what is causing your RPM errors. The RPM is normally not ever that far off. Setting 02-06 to 400 like you have it tells the VFD that you have a 400 hz motor. No other custom settings would be needed. The VFD interprets the 0-10 volt signal from Acorn and outputs the correct frequency to your motor. The default setting would have been just fine.

You should also set 02-03 to whatever the rated speed of your spindle is. I assume it's either 18k or 24k. You should also set this in the Wizard.

You are using a VERY old version of CNC12 with known bugs that does not offer free support. Consider installing the latest 5.3 version.

Second, you still have communication errors in your error log. You should consider fixing these first and the latest free version of CNC12 might help with this issue.

[needforfeeds]

ok! thank you for your help!

so i tried using a default V/F setting "General use 60Hz" (01-00 = 4) and I set 02-03=24000 (set cnc12 wizard spindle settings to 24000max and 1000min).

when i used MDI to try m3 s8000 the spindle started slowly but did not get up to speed before i got a "9030 spindle fault" and on my VFD screen is shows "CL" which is "inverter over current".

I reset and tried again, with m3 s1000, and had the same result. i thought maybe a lower RPM would be less likely to fault.

When i was trying these default VF curve parameters, "01-02= max frequency" i could not set this to 400hz, its default is 60hz. when i try to set it as 400hz, i get the "Err2" code on my VFD screen. "Err2" seems complicated and relates to skip frequencies. This is the reason why i originally went down the custom VF road, i couldn't make 01-02=400hz unless i changed 01-00=7 custom.

These are the parameters i used.

13-08 = 1160 (reset to factory setting 60Hz, 220V/380V drive)

00-02 = 1 (external run, Centroid)
00-05 = 2 (AVI freq, Centroid)
00-12 = 400.00 Hz ; Max frequency (24k)
00-13 = 16.6 Hz ; Min frequency (1k)

01-00 = 4 ; "General use 60Hz V/F curve"
01-01 = 220.0 V ; Max voltage
01-02 = 60 Hz ; Max frequency
01-03 = 100.0 % ; Max voltage output at max freq

02-01 = 6.0 A ; Rated current (from spindle plate)
02-03 = 24000 ; Rated rpm
02-04 = 220 V ; Rated voltage
02-05 = 2.2 kW ; Rated power
02-06 = 400.0 Hz ; Rated frequency

03-11 = 1 (RY1 fault to Centroid)

I am going to swap the 0-10v wire tomorrow with shielded and a drain.
I think i will wait to install cnc12 v5.3 until get this sorted.

any input is appreciated.
Thank you!

[ShawnM]

When parameter 01-00 is NOT set to 7 then it defaults to the frequency you have set in parameter 00-12 which you say is set to 400. It does not use 50 or 60 hz. This is why I'd recommend you start with the default settings BEFORE you go making changes.

Some builders get off in the weeds because they make too many changes to their VFD parameters when they are not needed. I would reset the VFD to factory and setup the motor parameters only, nothing else. Get the spindle running using the pot on the VFD first, then gradually change one parameter at a time until it's working from Acorn.

[needforfeeds]

SUCCESS! I disconnected the acorn and worked it out through the VFD keypad/potentiometer. Thank you all for your suggestion/help and ShawnM!

I did have to use a custom VF curve but my RPM problems were solved by replacing the 0-10v wire with shielded wire and then adding the 0.1uF capacitor to it. I also had to add 2 parameters to stop over current faults when starting and stopping.
I had to add "start frequency = 10Hz" and set my "stopping method = coast to stop".

These are my updated parameters if its useful to anyone.

00-02 = 1 ; External run/stop (Acorn)
00-05 = 2 ; External AVI signal output (Acorn)
00-12 = 400.00 Hz ; Max frequency
00-13 = 60 Hz ; Min frequency
01-00 = 7 ; Custom V/F curve
01-01 = 220.0 V ; Max voltage
01-02 = 400.00 Hz ; Max frequency
01-03 = 100.0 % ; Max voltage output at max freq
01-04 = 320 Hz ; Mid2 frequency
01-05 = 80 % ; Mid2 voltage
01-06 = 240 Hz ; Mid1 frequency
01-07 = 60 % ; Mid1 voltage
01-08 = 60Hz ; Min frequency
01-09 = 16.5% ; Min voltage
01-11 = 10Hz ; Start Frequency*****
02-01 = 6.0 A ; Rated current
02-03 = 24000 ; Rated RPM
02-04 = 220 V ; Rated voltage
02-05 = 2.2 kW ; Rated power
02-06 = 400.0 Hz ; Rated frequency
03-11 = 1 ; Fault to Acorn
07-09=1 ; Coast to stop*****
11-01 = 6 kHz ; PWM carrier frequency

I intend to update CNC12 to 5.3 in the near future.
Still have some basics I want to figure out first.
Thank you, thank you, thank you!

[ShawnM]

Glad to hear you got it all sorted out. Shielded wire and cap are a must for the analog signal to the VFD. It'll save you a lot of headaches in the long run.

You can add an inexpensive braking resistor to your VFD and then modify the ramp times accordingly to eliminate the "start and stop" faults you were having. Coast to stop is not the best choice as you'll be standing around waiting to change a tool.

But if you're happy with the setup, I'm happy.