Accupath knee mill Y axis malfunction

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5868
Posts: 4
Joined: Mon Jun 15, 2020 9:24 am
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: K20269
DC3IOB: No
CNC12: No
CNC11: No
CPU10 or CPU7: No

Accupath knee mill Y axis malfunction

Post by 5868 »

We have an older knee mill by Accupath running a CNC10 control (3K20269)

When we try to move the Y axis plus or minus, it always rapids plus for a second, then faults out with a Y axis encoder fault.
How do I narrow this down to if its an encoder, wiring, or drive problem?

thanks!
5868
Posts: 4
Joined: Mon Jun 15, 2020 9:24 am
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: K20269
DC3IOB: No
CNC12: No
CNC11: No
CPU10 or CPU7: No

Re: Accupath knee mill Y axis malfunction

Post by 5868 »

To be more specific, I get a 410 Y axis Position error
5868
Posts: 4
Joined: Mon Jun 15, 2020 9:24 am
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: K20269
DC3IOB: No
CNC12: No
CNC11: No
CPU10 or CPU7: No

Re: Accupath knee mill Y axis malfunction

Post by 5868 »

I should also add that his mill has been in service for several years, and was running fine last week. The X and Z axis motors work correctly.
5868
Posts: 4
Joined: Mon Jun 15, 2020 9:24 am
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: K20269
DC3IOB: No
CNC12: No
CNC11: No
CPU10 or CPU7: No

Re: Accupath knee mill Y axis malfunction

Post by 5868 »

This machine's floppy drive no longer works, and I see no external USB ports, so I am unable to get a report linked to this post.
Please advise on how to proceed with troubleshooting this problem.

Thanks!
cncsnw
Posts: 3763
Joined: Wed Mar 24, 2010 5:48 pm

Re: Accupath knee mill Y axis malfunction

Post by cncsnw »

Do you get the same condition if you jog the Y axis in Slow, Incremental, x100 mode?

Or in that case do you get "411 Y axis(2) full power without motion"?

If you get "410 ... position error" even when you you only try to move it 0.010", then you probably have shorted FETs on the servo drive, and you need to send the drive unit (probably a DC3IO) in to Centroid for repair.

If you get "411 ... full power without motion" instead, then it is probably an encoder feedback problem: most likely a dead encoder on the Y axis servo motor.
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