Unstabe rpm with Lenze drive (Resolved)

All things related to the Centroid Acorn CNC Controller

Moderator: cnckeith

LenelyWolf
Posts: 90
Joined: Sun Jan 17, 2021 3:13 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: none

Re: Unstabe rpm with Lenze drive

Post by LenelyWolf »

martyscncgarage wrote: Sun May 02, 2021 1:44 pm The capacitor may help
Thanks... already ordered one so I’ll try it.. I have also ground both ends of that shielded cable but that didn’t help.
martyscncgarage
Posts: 8251
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: Unstabe rpm with Lenze drive

Post by martyscncgarage »

LenelyWolf wrote: Sun May 02, 2021 1:47 pm
martyscncgarage wrote: Sun May 02, 2021 1:44 pm The capacitor may help
Thanks... already ordered one so I’ll try it.. I have also ground both ends of that shielded cable but that didn’t help.
Unground both end.
Also try just a pair of 18gauge wires. You have nothing to lose while you are waiting for the cap
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
LenelyWolf
Posts: 90
Joined: Sun Jan 17, 2021 3:13 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: none

Re: Unstabe rpm with Lenze drive

Post by LenelyWolf »

martyscncgarage wrote: Sun May 02, 2021 1:50 pm
LenelyWolf wrote: Sun May 02, 2021 1:47 pm
martyscncgarage wrote: Sun May 02, 2021 1:44 pm The capacitor may help
Thanks... already ordered one so I’ll try it.. I have also ground both ends of that shielded cable but that didn’t help.
Unground both end.
Also try just a pair of 18gauge wires. You have nothing to lose while you are waiting for the cap
Ok so this helped. I have ungrounded both ends and it was better but not perfect. Then I replaced cable for 18awg and now it runs nice and stable. Thank you. I really appreciate your help. Can you also explain why making it better actually made it worst.. I don’t get it
martyscncgarage
Posts: 8251
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: Unstabe rpm with Lenze drive

Post by martyscncgarage »

I suspect the larger wire added a bit of capacitance.
I can't explain it really. But glad it helped you.

Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
polaraligned
Posts: 106
Joined: Mon Feb 07, 2011 8:03 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: Yes
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: No
CNC Control System Serial Number: 1030090103
Location: Montvale, NJ

Re: Unstabe rpm with Lenze drive

Post by polaraligned »

Sounds like you had a bad wire. Maybe the wire had some corrosion and was not making a good connection.
(.5mm) 24 awg is a bit small and delicate. The added capacitance from increasing the size is trivial.
LenelyWolf
Posts: 90
Joined: Sun Jan 17, 2021 3:13 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: none

Re: Unstabe rpm with Lenze drive

Post by LenelyWolf »

polaraligned wrote: Sun May 02, 2021 6:12 pm Sounds like you had a bad wire. Maybe the wire had some corrosion and was not making a good connection.
(.5mm) 24 awg is a bit small and delicate. The added capacitance from increasing the size is trivial.
I have inspected the cable by taking it apart and didn’t see any visible damage. Well at least it is fixed. Should I still install that capacitor?
polaraligned
Posts: 106
Joined: Mon Feb 07, 2011 8:03 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: Yes
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: No
CNC Control System Serial Number: 1030090103
Location: Montvale, NJ

Re: Unstabe rpm with Lenze drive

Post by polaraligned »

LenelyWolf wrote: Sun May 02, 2021 6:33 pm I have inspected the cable by taking it apart and didn’t see any visible damage. Well at least it is fixed. Should I still install that capacitor?
I wouldn't bother.
martyscncgarage
Posts: 8251
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: Unstabe rpm with Lenze drive (Resolved)

Post by martyscncgarage »

It shouldn't hurt either. Acorn does not have the same spindle analog circuitry that Oak and All in One do.
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
Post Reply