myths420 wrote: ↑Fri Oct 25, 2024 7:15 pm
the newest version im just starting my build. and yes i have seen people damaging boards because they were hooking dc motors up to 10v. my question is the same. if acorn can now supply just 5v. what exactly is the purpose of the kbsi board? from everyone who talks about it or writes about it the sole purpose is to convert a 10v signal down to 5 volt. also to convert signal to a +/- if its needed. as this board doesnt require the signal converted from my understanding. the only thing the kbsi does is the same thing acorn does now. so im trying to understand why its needed anymore?
Simply put you are connecting two different electrical systems. There can be a huge energy potential between the two that can cause damage to the circuitry. The KBSI-240D does exactly that. The two systems are never physically tied together. The board takes care of that.
Unless you get something from the manufacturer that ensures the DC motor controller you are connecting to has an isolated analog input, you should use the KBSI-240D. Otherwise, take the chance and let everyone here know how it works out or didn't work out. it could be a costly gamble.
Is your machine a Precision Matthews? Call them, ask their support staff.
Marty
ok so its basically acting as a surge protector then so no spikes can flow between the 2. its not looking like the ksbi board will work on my mill from the way its acting with it. im not sure if it was you or someone else i was reading about using a
si5 with kbic-120 board instead.
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You should double check your connections and any jumper settings of the KBSI-240D, test it. Don't hook it up to your spindle drive, just hook it up to Acorn or another DC voltage source like a bench power supply, measure what is coming out of it.
Do check the Acorn spindle Analog output with a meter. Make sure its still OK. (Just like the benchtest)
This is an older video but will still apply:
Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
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ok ty, i actually just followed that video this morning. ive spent the last 2 days trying to get this ksbi board working correctly. so when the ksbi is hooked up the the acorn and not to the mill everything is correct. every volt is correct. all the adjustments adjust correctly. everything just looks perfect. the problem only happens when the speed wires are run from the ksbi to the mill. at that time everything is correct. acorn volts are what they are set to for the speed, the input on the ksbi shows what acorn says it should. yet the ksbi output changes and does not work correctly. i had thought maybe this 20g shielded wire wasnt good and had seen people say to use 18 or bigger so i tried some bigger line. reguardless of what ive tried before connecting it to the spindle everything is perfect. after hooking it up everything is perfect except it starts throwing weird output volts. so thats where ive been stuck the last 2 days and started thinking is this thing really needed haha.
ive double checked numerous times to verify the spindle wires are correct and that should all be good as well.
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Have no idea how you have it connected to your spindle drive. Are you sure you have it correctly wired? Do not wire it to the source voltage for the potentiometer.
At this point, I am out of ideas
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
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martyscncgarage wrote: ↑Fri Oct 25, 2024 8:10 pm
Have no idea how you have it connected to your spindle drive. Are you sure you have it correctly wired? Do not wire it to the source voltage for the potentiometer.
At this point, I am out of ideas
i have it wired up like the diagram in my first post. i dont have a clue either. thinking maybe ksbi board bad. going to try 1 more.
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I also have a pm-30 and am using a kbsi-240D and have a similar problem. When I disconnect 240v to the motor the 0-5 output from the kbsi is steady after I connect 240v if fluctuates. Above 1200 rpm is it not so bad but when the voltage goes lower is it not a steady output. The acorn output voltage is correct. This maybe a pm-30 only issue.
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