Spindle wiring for Mesa 7I76E and Teco EV series VFD

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01 Oct 2020 11:22 #184484 by rogerfries
Hi all,

With reckless abandon I tore the heart out of my perfectly good running Bridgeport Mill running Mach 3. It's a home hobby machine so no big deal for some downtime. I've got the machine mostly sorted out under Linux CNC, but I'm having trouble getting my VFD wired back up. It was working with my old PMDX-127/PMDX-107 setup. Just need to get the Mesa 7I76E to command the VFD.

www.tecowestinghouse.com/Manuals/ev_operating_manual.pdf

When I turn the spindle on no matter what it seems to be targeting 220 Hz, which might be a tad fast ;). Even with the spindle override all the way down and a very low S setting. Also Spindle forward does not work, but spindle reverse makes it go forward. Clearly I've miswired it! Before I blow something up, I figured I's ask if anyone knows how I should wire this properly?

Thanks!

Roger

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01 Oct 2020 11:27 #184486 by Aciera
Can you post your ini and hal files?

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01 Oct 2020 15:37 #184496 by PCW
How is the TECO wired to the 7I76E?

I would expect
7I76E TB4            VFD
1 SPINDLE-           8 or 11 COM
2 SPINDLE OUT        10 AIN
3 SPINDLE+           9 +10V
The TECO VFD doesn't look like it supports ENA/DIR mode so one way around this is to use
two 7I76E field outputs for FWD and REV:

7I76E OUTPUT-X       4 S1
7I76E OUTPUT-Y       5 S2

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01 Oct 2020 16:26 #184497 by rogerfries
HAL & INI File attached

File Attachment:

File Name: Boss5.ini
File Size:5 KB

File Attachment:

File Name: Boss5.hal
File Size:13 KB
Attachments:

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02 Oct 2020 00:42 #184524 by rogerfries
The work around of using the outputs worked, Thanks!

One problem remains. CW Spindle works well, But CCW spindle speed ramp is reversed. S0 is full speed, S1000 is slower, S2000 is even slower. Any Ideas?

Thanks

New Files attached

File Attachment:

File Name: Boss5_2020...01-2.hal
File Size:13 KB

File Attachment:

File Name: Boss5_2020-10-01.ini
File Size:5 KB
Attachments:

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02 Oct 2020 01:10 #184525 by PCW
change:
net spindle-vel-cmd-rpm => pid.s.command
to:
net spindle-vel-cmd-rpm-abs => pid.s.command

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02 Oct 2020 01:27 #184526 by rogerfries
I seem to have fixed it by unchecking the box "Use+- voltage for direction". Is this the same setting as the "net spindle-vel-cmd-rpm-abs => pid.s.command"?

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02 Oct 2020 01:33 #184527 by PCW
Yes, pncconf will use the -abs spindle command
if you don't check +- voltage
The following user(s) said Thank You: rogerfries

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