Strange Z motor move

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sonra
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Strange Z motor move

Post by sonra » Thu Oct 29, 2020 5:59 pm

Hi
I replace my original M2 Z motor( black one ) that stop working with new one (Redrex 310mm T8x8 Nema 17 Stepper Motor 1.5A 40Ncm)
For about days i was happy with the new one today i got a problem that cause strange behavior a the Z movment . When i try to test it and send to Z home the bed touch the switch and begin to move up and down several times before stop few mm below the switch
Any idea? ( hope it is not again a motor problem )
regards Doron

sonra
Posts: 110
Joined: Sat Aug 22, 2015 3:44 pm
Location: Israel

Re: Strange Z motor move

Post by sonra » Fri Oct 30, 2020 1:26 pm

Hi
May be that i am using a MIC6 aluminum plate that I got from Insta is to much heavy for the motor.When I try to move the bed without it the bed stops at the Z home ? ( the new motor that I use now instead the black original one is
Redrex 310mm T8x8 Lead Screw Integrated with Nema 17 Stepper Motor 1.5A 40Ncm/57.1 oz
Doron

sonra
Posts: 110
Joined: Sat Aug 22, 2015 3:44 pm
Location: Israel

Re: Strange Z motor move

Post by sonra » Fri Oct 30, 2020 1:27 pm

The original engine was silver not black

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ednisley
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Re: Strange Z motor move

Post by ednisley » Fri Oct 30, 2020 2:12 pm

sonra wrote:
Thu Oct 29, 2020 5:59 pm
Any idea?
Make sure the Marlin firmware sets a sufficient current for the Z-axis motor.

Look for DIGIPOT_MOTOR_CURRENT in either Configuration.h or Configuration_adv.h (which file depends on the Marlin version you're using) and change the Z-axis value as needed.

The normal value seems to be 185.

Reload the firmware with the new current and test the results.

The heavy aluminum plate may require more current, perhaps a setting of 215. The added weight may require reducing the Z-axis acceleration and velocity maximum values, as set in Configuration.h, although increasing the current may be enough.

sonra
Posts: 110
Joined: Sat Aug 22, 2015 3:44 pm
Location: Israel

Re: Strange Z motor move

Post by sonra » Fri Oct 30, 2020 3:32 pm

Hi
Download the FW from MG site .Found the key in Configuration_adv.h

Code: Select all

[code]/[size=150]/ Motor Current setting (Only functional when motor driver current ref pins are connected to a digital trimpot on supported boards)
#define DIGIPOT_MOTOR_CURRENT {135,135,135,135,135} // Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A)[/size]
[/code]
But can not find what parameter ( try to google it ) is for the Z motor or I sould change them all ?

sonra
Posts: 110
Joined: Sat Aug 22, 2015 3:44 pm
Location: Israel

Re: Strange Z motor move

Post by sonra » Fri Oct 30, 2020 3:59 pm

OK found the parameter I think it is the last one .Correct me if I am wrong
Thanks for help Doron

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ednisley
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Re: Strange Z motor move

Post by ednisley » Fri Oct 30, 2020 11:41 pm

The five numbers within the curly braces set the current for the X, Y, Z, E1, and E2 motors, in that order.

Change the third 135 to whatever value produces enough torque to lift that aluminum platform. Try 185 first, then 215.

So, for example:

Code: Select all

#define DIGIPOT_MOTOR_CURRENT {135,135,215,135,135}

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