Advanced Search

I have a 4 axis router with step/dir servos using a 7i76EU+7i85 to command the servos and read the encoder feedback.  I have the servos reasonably tuned running closed loop.  But I'm seeing a following error spike on homing to index for the W axis (XYZW) on the first attempt at homing the machine after power up.  After the initial encoder position reset on the homing index it will home fine the 2nd try and works after that. If the machine was parked at the W-zero location when Linuxcnc is turned off and started it does not do the following error.  For some reason it seems like Linuxcnc is not ignoring the F-eror on the encoder index reset for the W-axis like it should.  Any Ideas how to fix this?

Here are my main hal and ini config files.
 

I recently got a new probe, and discovered that if I wired it *correctly* it did not work.  I had to wire it backwards, because the small current used to make the light go on when it "hit" was also enough to drive the 7i76E pin, so the probe was always "not hit".  So even if you follow the directions, sometimes it takes more debugging :-P
Always check the voltage at the pin!
 

Thank you for all of your help Peter, I have finished all of my testing now the conclusion is clear.

OK if you have +24V on TB1 pin 5 relative to TB1 pin 8
and no red LED above TB1 when LinuxCNC is not running,
The 7I76EUs field I/O section has failed or been damaged.

23.9v
Thanks

If you measure from
TB1 pin 8 (-) to TB1 PIN 5 (+)
 What do voltage do you get?

 

W1 is in the default position left and the fileld power is correctly conneced
Thanks
George

OK that means you have no VIN so the field I/O section is unpowered

Normally VIN comes from VFIELD (W1 LEFT)

So either you have:

1.  No VFIELD

2. W1 is in the right hand position (it should be in the default left position)

3. Some hardware issue with the field I/O section.

no it never lights,
thanks

Before you start LinuxCNC, does red LED CR11 (above TB4) Illuminate?
 

Hi PCW,
I have attached the linuxcnc report. I put it for line 36 in hal but all of the other inputs 05-09 were the same errors. No there aren't any red led's on the board at that location with the error i get there will be one in amonst the boot up led's.
Thanks

When you say you have an error,
Please please copy/paste that error
in your post.

It's nearly impossible to diagnose the issue
without accurate error reporting.

Also do you have a red LED (CR11) illuminated
above the Spindle connection (TB4) ?

 

I just figured out what the gpio pins are and they are if iam correct the 50 pins on P1 and P2 halshow was not showig any sserial port pins. That is probably why the pin do not exist errors I was getting is from.
Just a thought

Thank you for your response PCW. I have checked and there is field power of 24v across pins 1&8 it is also tranfered to the nearby power block can't remember its tb number but done as mentioned in posts and manuals.
Thanks

The field I/O (TB4,5,6) is not GPIO.

If you assign TB5 or TB6 I/O pins or spindle (TB4) pins in pncconf and
you get pin not found errors, this most likely means that you do not
have field power applied (TB1 = ORANGE  connector)