Unsolved Runaway motor behavior w/ 3 independent z axis steppers
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post your config and home scripts
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I suspect that there is binding in your mechanical system and one or more of the motors is stalling, but then being commanded to move again.
Try disconnecting the motor shafts from the mechanical system and try the same moves with the motor shafts spinning freely.
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Configs attached.0_1565371941476_Duet configs.txt
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@veti Done & thank you.
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what z motors do you have?
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@bot I’ll add this to the things-to-try list.. Thank you.
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@veti I’m almost certain I have these 1.8 degree steppers on the 3 Z lead screws:
STEPPERONLINE Nema 17 Stepper Motor Bipolar 39mm Body 45Ncm (63.74oz.in) 1.5A 12V ...
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@jonpascoe said in Runaway motor behavior w/ 3 independent z axis steppers:
I’m almost certain I have these 1.8 degree steppers on the 3 Z lead screws: 1.5A 12V
this is important. do double check this.
you should normally run the steppers at 70-80% of their rated current.from the config i take it you are building a RailcoreII 300ZL
those steppers are not the ones from the BOM.
from https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors
Avoid motors with rated voltage (or product of rated current and phase resistance) > 4V or inductance > 4mH.
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Your motor currents are all to low for those 1.5A motors. Try between 1000mA and 1300mA. The whining is almost certainly caused by binding (see the response from @bot) together with low Z motor torque.
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