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Post by S. Ronin McGowan on Dec 23, 2021 20:40:58 GMT
Not really much you can do but be careful. Due to the fact that the motor effectively becomes a generator when moved, the faster it turns the more voltage generated. Any additional circuity added to the motor would interfere with the motor working properly. Thus moving the gantry slowly by hand is about the only thing you can do or disconnect the motors from the drivers.
Ah thank you Bruce, I appreciate the savings on research time Looks like I'll be fashioning some sort of quick (dis)connect, maybe taking advantage of the twisted pairs in CAt5e or higher shielded plenum AND use standard CAT5/6 terminators and ports for the (dis)connect.
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hans
Full Member
Posts: 151
Machine: Other
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Post by hans on Dec 24, 2021 0:47:57 GMT
If you're concerned about the stepper motor producing voltages that can damage the driver when the motor is manually spun (the router mount is moved by hand), a fairly simple solution is available. It requires two diodes to be added to the existing circuitry. Diode 1 prevents any generated voltage that is greater than the driver's power supply (plus the diode drop) from being applied to the driver's output. Diode 2 prevents any negative (below ground) generated voltage from being applied to the driver's output. Of course, blowing out the driver by manually spinning the motor may not be the issue, as motor driving circuits usually incorporate protection diodes as a matter of course. I've often moved my Carve King and Mega V router mounts by hand -- sometimes rapidly -- and have not (yet) damaged any motor drivers. Are you using the drivers provided by MillRightCNC? Low-cost aftermarket drivers might not incorporate protection diodes.
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Post by S. Ronin McGowan on Jan 10, 2022 5:05:09 GMT
I'm pretty sure they were using Polulu drivers, which are what I'm using now as well.
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