926 ошибка фанук

Bit of an update but no progress really…bit more of a bump hoping some of the experts had a few more ideas at narrowing it down and some questions on parts numbers. I’m leaning towards it being the 4th axis SVM amplifier.

To date I’ve checked:

• Alarm history page (on two of the 926 alarms, Y-axis 364 or 463 occured 1 to 2sec prior)
• L1/L2/L3 system voltages, all 217 to 218VAC
• 24vdc power supply voltage =24.01vdc
• Cleaned all the optical cables and ports
• Tried to bypass the 4th axis amp.
• Good earth continuity from amplifiers to the cnc’s earth bar, and earth bar to my 3phase distribution board.
• Checked SVM and SVMP alarm codes

The SVM does not show any alarms (no yellow LED). The SVMP also has no alarms on Status1/Status 2, except when in black screen of death status 1 is 24, but I think thats normal when the controller isn’t fully booted?

I learned through fiddling that the optical cables are really really sensitive to contamination, this video on youtube explains it pretty well

Though plugging and unplugging them I must have made the contamination worse because the control wouldn’t even boot at one point. I was able to get some cleaning supplies from a local electrical/data shop. The cleaning tape dispenser and sticks to clean the outlet are cheap. Its recommended you clean before plugging anything back in every time; a good practice for a greasy machine shop. Didn’t solve my problem though.

The machine boots fully again after cleaning, but is stuck now with a 5136 alarm. I tried plugging the first optical cable straight into the SVMP, bypassing the servo amp for the 4th, but I still have the 5136 alarm. In this state, the machine will stay powered up indefinitely and not have a black screen of death 920/926 alarm. I’m not sure if this tells me anything though.

Possibly a question for Vancbiker or Angelw: once a 5136 alarm occurs (less amplifiers than expected per parameters), does the machine stop trying to communicate via fiber? E.g. after the 5136 occurs does the watchdog/health check stop happening? If it stops happening then that test tells me nothing, if the watchdog is still active it leads me to believe its either the 4th axis amp or the second fiber cable causing the 920/926 alarms.

Any other diagnostic input? I’d rather not start throwing parts at the machine without confirming a likely culprit.

Also: my axis control card is a A20B-330-0392/01A, from what I’ve read the 01A is the version number. There is an 02A on ebay, are these backwards compatible or do I need the same version? Similar question with the SVM, mine is a A06B-6130-H002 E, is the E a version number and does it matter?

Any help? Have I broken some unspoken rule?

This thread has a similar type of error but he got a lot more assistance: https://www.practicalmachinist.com/…hine-new-problems-spindle-error-codes.411601/ I’m kind of struggling to understand why.

BTW I ordered an axis card and the two optical cables, hopefully the version thing I mentioned earlier doesn’t matter. I didnt want to just throw parts at it randomly but I guess I am. I ordered those items as it was cheaper than the small SVM amp…if the axis cards and optical cables don’t fix it I’ll know its the amp.