Machine moves by itself

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28 Jul 2022 21:34 #248592 by Ingo
Machine moves by itself was created by Ingo
Hello guys,

lt's the first time I make a machine with a parallel port.  The machine is all ready and working, but the machine is stopped, the spindle is off, it moves by itself slowly in the direction of X+, Y+ and Z-.  Has anyone ever experienced this?  Before she was half crazy with the spindle turned on, I isolated the power cable from the spindle and that problem solved….

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29 Jul 2022 02:59 #248600 by smc.collins
Replied by smc.collins on topic Machine moves by itself
sounds like floating ground voltage between servi drive inputs a pc output

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29 Jul 2022 17:55 #248639 by tommylight
Replied by tommylight on topic Machine moves by itself
Servo motors or stepper motors?
In case of servo, DC or AC servo?

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01 Aug 2022 00:57 #248762 by Ingo
Replied by Ingo on topic Machine moves by itself
I am using 220v DC servo motors

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01 Aug 2022 01:00 #248763 by Ingo
Replied by Ingo on topic Machine moves by itself
Hello Collins,

I made an improvement in the grounding of the control board and it seems that it solved, I did about 4 hours of tests and it didn't present this problem anymore.

At first solved thanks a lot for the help

Ingo

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17 Aug 2022 02:20 #249927 by Ingo
Replied by Ingo on topic Machine moves by itself
Hello friends,

I've been in battle since Thursday, because the problem is back….  I did the grounding and at first for a moment it resolved but now it came back worse with more force.  My question is related to transmission speed ( Feed x scale ), for example the encoder resolution is at 4000ppv, the machine speed is at 5000mm/min and the scale is at 400, is this related?

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17 Aug 2022 09:43 #249939 by tommylight
Replied by tommylight on topic Machine moves by itself
Do they move when LinuxCNC is not running?
Are you using a Mesa 7i77, meaning the drives are in velocity mode?
Do they move when LinuxCNC is on and enabled?

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17 Aug 2022 13:12 #249950 by Todd Zuercher
What hardware are you using to read the encoders, and interface with the servo drives?

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17 Aug 2022 15:58 #249953 by Ingo
Replied by Ingo on topic Machine moves by itself
When LinuxCNC is in normal automatic mode, but when it is stopped with the servo-on active, it starts to move by itself. I'm not using 7i77, a generic parport.

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17 Aug 2022 16:11 - 17 Aug 2022 16:15 #249955 by smc.collins
Replied by smc.collins on topic Machine moves by itself
my machine will do the same thing, do you have the drive enable routed through the 7i77 ? if not, do that, almost all velocity mode drives tend to creep due to voltage fluctuating and ground voltage variances.


Mesa electronics does sell a galvanic isolation adapter for the db25 that should in theory solved this issue.

i have electrokraft 400 brushed motor drives. 

this is all very common, just run the drive enable control through the 7i77 on ENA + - on the tb connectors
Last edit: 17 Aug 2022 16:15 by smc.collins.

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