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I’m finally going to attempt to wire up a KBCC-R speed controller and an isolator board to my lathe. Most of what’s in the manual makes sense but I am not clear on the P1, P2, and P3 connections. These normally would be wired into a 5k pot. But, since I’ll be sending 0-10v in to the speed controller via the isolator, which of these P connections would be + and -?

Thanks, Scot

ScotY wrote: ↑Fri Mar 02, 2018 3:26 am I’m finally going to attempt to wire up a KBCC-R speed controller and an isolator board to my lathe. Most of what’s in the manual makes sense but I am not clear on the P1, P2, and P3 connections. These normally would be wired into a 5k pot. But, since I’ll be sending 0-10v in to the speed controller via the isolator, which of these P connections would be + and -?

Thanks, Scot

Do NOT wire that controller without it's signal isolator. It is required with Acorn!

Hiya Scot, I apologize for not posting a diagram of how my ORAC is wired as I intended to do several weeks ago. I got a good start on it & immediately got a stack of drawings from my neighbor of parts he wanted to pay real money for.

I have to clarify the KBCC hookup soon cuz' I need to wire one up myself for the treadmill motor on the mill project. Hopefully it'll get sketched up this weekend.

ScotY wrote: ↑Fri Mar 02, 2018 3:26 am I’m finally going to attempt to wire up a KBCC-R speed controller and an isolator board to my lathe. Most of what’s in the manual makes sense but I am not clear on the P1, P2, and P3 connections. These normally would be wired into a 5k pot. But, since I’ll be sending 0-10v in to the speed controller via the isolator, which of these P connections would be + and -?

Thanks, Scot

Thanks, Milton, that would be great.

ScotY wrote: ↑Fri Mar 02, 2018 11:58 am

ScotY wrote: ↑Fri Mar 02, 2018 3:26 am I’m finally going to attempt to wire up a KBCC-R speed controller and an isolator board to my lathe. Most of what’s in the manual makes sense but I am not clear on the P1, P2, and P3 connections. These normally would be wired into a 5k pot. But, since I’ll be sending 0-10v in to the speed controller via the isolator, which of these P connections would be + and -?

Thanks, Scot

Messin' with Mar...uhh, Sasquatch! Better watch yer back from now on.

I see you are using the KBSI-240D, kind of complicates things a little bit because you have two separate devices to setup. The schematic in the manual is pretty helpful.
https://www.kbelectronics.com/manuals/k ... manual.pdf
You are using Voltage Input Signal follow those instructions
Output seems to be from KBSI-240D terminal 10(+) to KBCC P2
and from KBSI-240D terminal 9(-) to KBCC F-

Milton can confirm.

You will be fiddling with Max/Min pots on both the KBSI and the KBCC

Marty

DICKEYBIRD wrote: ↑Fri Mar 02, 2018 12:22 pm

ScotY wrote: ↑Fri Mar 02, 2018 11:58 am

ScotY wrote: ↑Fri Mar 02, 2018 3:26 am I’m finally going to attempt to wire up a KBCC-R speed controller and an isolator board to my lathe. Most of what’s in the manual makes sense but I am not clear on the P1, P2, and P3 connections. These normally would be wired into a 5k pot. But, since I’ll be sending 0-10v in to the speed controller via the isolator, which of these P connections would be + and -?

Thanks, Scot

Messin' with Mar...uhh, Sasquatch! Better watch yer back from now on.

Oh, now Milton is asking for trouble!

So I’m wondering if there’s something wrong with my speed controller. I tried wiring up as Marty suggested except I just applied voltage to P2 and F- on the speed controller using a AA battery. Not willing to risk the Acorn on this used controller. I did try doing the same thing going through the KBSI-240D with the same results.

Anyway, I see no voltage on the A1 and A2 motor outputs when P2 and F- get 1.5v. The LED on the main part of the board flashes when the controller is powered up but goes out. The LED on the reversing board goes on and stays on. I don’t have a 5k pot so I can’t wire it up in “manual” mode. I suppose I could cobble up some resistors try that but honestly I don’t understand what the pot does between the P1, P2, and P3 terminals. I measure about 50v or so on each of them, referenced to ground and various voltages when measuring pin to pin.

Milton should know...is this normal?

Hiya Scot, you're probably still snoozing as I type this being in Hawaii but my advice is to step away from the 9V battery & voltmeters unless you're electrically knowledgeable as Marty. There's vicious monsters in them thar pot terminals on KB boards if you do the wrong thing!

I'm in the shop today trying to finish a couple paying jobs but will post a sketch later of the wiring that is working well for me. Should be this afternoon if all goes well.