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COM wire connections

Posted: Sat Feb 08, 2020 6:19 pm
by wagdamotta
Hi Marty
I watched a video yesterday from you at YOUTUBE and I saw you make the connections from the power supply to the Acorn and to the E stop switch and for the power supply for the servo drive, and you connected all COM together and used a block, I have problem before with my cnc control that when I turn the power off the servo jump the position, I don't know If you remember, I send to you a video before on YOUTUBE.
But after I watched your video I when take look my connections and I saw that I not connect all the COM together like you did, from the COM of Acorn power supply you put a jump wire to the drive power supply and to the connection block.
Do you think because I not did the same may cause the problem? If yes let me know please and I change the wires because I put a switch between the power supply and the driver for me turn the power off the drive before turn the power off on Acorn board.
Thank you
Wagner Damotta

Re: COM wire connections

Posted: Sat Feb 08, 2020 8:13 pm
by cnckeith
Wagner,
post a photo of your setup, what kind of motors and drives are you using, link to the manual? etc..
post a fresh report.zip.. follow the posting guidelines here..so we can help you. viewtopic.php?f=60&t=1043
and in general follow the Acorn hookup schematics https://www.centroidcnc.com/centroid_di ... matics.zip

Re: COM wire connections

Posted: Mon Feb 10, 2020 4:13 pm
by martyscncgarage
wagdamotta wrote: Sat Feb 08, 2020 6:19 pm Hi Marty
I watched a video yesterday from you at YOUTUBE and I saw you make the connections from the power supply to the Acorn and to the E stop switch and for the power supply for the servo drive, and you connected all COM together and used a block, I have problem before with my cnc control that when I turn the power off the servo jump the position, I don't know If you remember, I send to you a video before on YOUTUBE.
But after I watched your video I when take look my connections and I saw that I not connect all the COM together like you did, from the COM of Acorn power supply you put a jump wire to the drive power supply and to the connection block.
Do you think because I not did the same may cause the problem? If yes let me know please and I change the wires because I put a switch between the power supply and the driver for me turn the power off the drive before turn the power off on Acorn board.
Thank you
Wagner Damotta
Wagner,
I vaguely remember. As Keith said, please post the information requested.
I tie my power supply commons together.

Re: COM wire connections

Posted: Tue Feb 11, 2020 9:09 pm
by wagdamotta
hi
I have DMM DYN2 servos.
report_38D2693D7A14-0118180556_2020-02-11_17-15-42.zip

Thank you

Re: COM wire connections

Posted: Tue Feb 11, 2020 9:30 pm
by wagdamotta
Hi
I have the DMM - DYN2 servos

Thank you
Wagner

Re: COM wire connections

Posted: Tue Feb 11, 2020 9:37 pm
by martyscncgarage
Wagner, did you ever consult with DMM about this problem?
I believe they were aware of the lurch but may have corrected it with a firmware update. But I only experience this on power up not power down.
Marty

Re: COM wire connections

Posted: Tue Feb 11, 2020 11:48 pm
by Mkelcy
FWIW, I've had good luck contacting DMM by email at: info@dmm-tech.com

Generally I've gotten a response in less than 24 hours, including over weekends.