# "A Man's GOT to Know His Limitations"

**URL:** <https://forum.onefinitycnc.com/t/a-mans-got-to-know-his-limitations/8930>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [November 14, 2021, 10:37pm UTC](https://forum.onefinitycnc.com/t/a-mans-got-to-know-his-limitations/8930 "2021-11-14T22:37:04Z")\
**Posts on this page:** 1\
**Showing post:** 24

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [November 16, 2021, 2:31am UTC](https://forum.onefinitycnc.com/t/a-mans-got-to-know-his-limitations/8930/24 "2021-11-16T02:31:34Z")

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> [@Webb](#):
>
> For the record, J1 is jumped at 2 and 3 per the manual

I don’t see anything about jumpers in the PDF manual. Could you make a copy of the printed manual page and post it?

> [@Webb](#):
>
> Only at very low RPMs

If you use the potentiometer, you may have a look at Analog Input Settings PD070 – PD076. I would set PD073 (Lower Analog Frequency) to “133” or “140” and PD072 (Higher Analog Frequency) to “400” accordingly to your spindles rated highest and lowest speed. Default in the VFD is “50” which could be the reason why the potentiometer sets speed too low.

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