Open loop stepper - 7i96 - following error

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5 years 7 months ago - 5 years 7 months ago #203853 by Muz94
While i'm here i ask another advice.
The new servo runs on 36V power, so i had to buy another PSU. At the moment i have 1 12v PSU for the extruder, inductive sensors and other stuff, 1 24v one for the stepper motors and 1 36v for the servos.
I bought my steppers from an insertion which described them as "24V 3A stepper motors". The code on the motors is: 23HS8430.
Looking around online i can't find a voltage rating for them, and i see a lot of topics where people choose the psus for their motors based on torque requirement without speaking of a "voltage rating".
The question is: do you think that i could get reed of the 24v psu and run the steppers on 36v too? The drivers are rated for 42V.
I'm asking this because i'm thinking about keeping the steppers on the Z axis which is only responsible of layer changes (and the stiffness of the steppers is useful to prevent the z axis from moving when the power is removed).
Last edit: 5 years 7 months ago by Muz94.

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5 years 7 months ago #203855 by tommylight

Muz94 wrote: The question is: do you think that i could get reed of the 24v psu and run the steppers on 36v too? The drivers are rated for 42V.

Normally yes, but since those are cheap drives with Toshiba TBXXn109 chips i would not push them over 27 or 28V.

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5 years 7 months ago #203856 by PCW
Step motors are current operated devices, Their maximum speed is determined
by the operating voltage. Usually the limit of operating voltage is the drives,
not the motors so check the maximum suggested voltage of you drives and make
sure its higher than 36V.
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5 years 7 months ago - 5 years 7 months ago #203859 by Muz94

tommylight wrote:

Muz94 wrote: The question is: do you think that i could get reed of the 24v psu and run the steppers on 36v too? The drivers are rated for 42V.

Normally yes, but since those are cheap drives with Toshiba TBXXn109 chips i would not push them over 27 or 28V.


I'm using TB6600 drives (or some chinese copy of them). Do you think they might not survive?

PCW wrote: Step motors are current operated devices, Their maximum speed is determined
by the operating voltage. Usually the limit of operating voltage is the drives,
not the motors so check the maximum suggested voltage of you drives and make
sure its higher than 36V.

On paper they should handle 42V, but i guess i might get a bit too close to the limit.
Last edit: 5 years 7 months ago by Muz94.

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5 years 7 months ago #203861 by tommylight
42V is the absolute maximum rating for that chip, working voltage should be 24V or thereabouts, but i am also sure i have them at 27V with no issues. Still i would not use them with 36V, but that is only my advice.

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5 years 7 months ago #203864 by PCW
It seems the people use them at 36V but 6V of over-voltage is
likely pretty easy to generate when decelerating especially with
switching supplies and their tiny output capacitors

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