Sprint 400 driver board

[jolyonjenkins]

Something sounds amiss. Did you blow yours up or was the drive not supplied in the first place???.


I can't see it happoening myself. The 0-90v units look like they run off 115vac input. (u.s. ver)
On 230vac input they give you 0-180v (looks like this is what you are finding). (u.k. ver)

The official boards are these by the looks of it:
https://www.kbelectronics.com/data_sheets/kbic_oem.pdf
http://www.kbelectronics.com/data_sheets/kbic.pdf
https://www.axiscontrols.co.uk/produ...eed-controller

PLEASE NOTE:
There is only one board that puts out 0-90v on a 230vac input and that is the:
KBIC-240DS
This is extremely likely the one you need.

(Initially the motor would be the u.s. standard one and they threw a quick fix board in for u.k voltages). Because it was cheaper!.

There's 3 options here.
1. you find a 180v motor for it.
2. have to resort to the buying the KB control board.
3. get 115Vac input to the sprint 400.

I might have blown mine up. There was a cascade of errors which led to me basically replacing a lot of the electronics.
I got a second hand board from ebay. It looks identical to the original board, and identical to the ones that I've seen in photos of other Denford micromills. The sprint board has a jumper which lets you set the input voltage to 230V (or 110V) so I'm not sure why you think I need the KB driver.

[dazp1976]

I might have blown mine up. There was a cascade of errors which led to me basically replacing a lot of the electronics.
I got a second hand board from ebay. It looks identical to the original board, and identical to the ones that I've seen in photos of other Denford micromills. The sprint board has a jumper which lets you set the input voltage to 230V (or 110V) so I'm not sure why you think I need the KB driver.

Your pdf has a typo. This is the proper one:
https://www.transdrive.co.uk/media/1...200-manual.pdf
The sprint 400 is: 110/240 = 90/180
So: 110v = 90v and 240 = 180v

The switch is just an input voltage selector like on a meanwell power supply.
However. Unlike a meanwell, a speed control is relative to it's input.
So if it gets 240v it'll put out 100%. If it gets 110v it'll only put out 50%.
Ergo 180/90.

Unless you have the actual 180v version motor for it I'm afraid you likely need the KB.
(basically a bodged voltage board worked out cheaper to get u.k. sales)

Yours may look the same to others but they'll likely have the 180v motor too.
Like this:
https://www.ebay.com/itm/393622606533



I may have updated previous post too while you responded.

[jolyonjenkins]

Your pdf has a typo. This is the proper one:
https://www.transdrive.co.uk/media/1...200-manual.pdf
The sprint 400 is: 110/240 = 90/180
So: 110v = 90v and 240 = 180v

The switch is just an input voltage selector like on a meanwell power supply.
However. Unlike a meanwell, a speed control is relative to it's input.
So if it gets 240v it'll put out 100%. If it gets 110v it'll only put out 50%.
Ergo 180/90.

Unless you have the actual 180v version motor for it I'm afraid you likely need the KB.
(basically a bodged voltage board worked out cheaper to get u.k. sales)

Yours may look the same to others but they'll likely have the 180v motor too.
Like this:
https://www.ebay.com/itm/393622606533



I may have updated previous post too while you responded.

Ah, this might explain why I can only get 100V out of it. Hmm. There do seem to be fairly cheap PWM DC-DC controllers on Ebay which I could maybe bolt on

[dazp1976]

Ah, this might explain why I can only get 100V out of it. Hmm. There do seem to be fairly cheap PWM DC-DC controllers on Ebay which I could maybe bolt on

Did you have it running before?.
Did you plug it in and pretty much blow the lot by any chance?.

Everything I look into so far is showing me schematics with 110v input.

This suggests to me that there should be a 220v-110v transformer in there for use with u.k. supply.

[dazp1976]

Did you have it running before?.
Did you plug it in and pretty much blow the lot by any chance?.
Everything I look into so far is showing me schematics with 110v input.
This suggests to me that there should be a 220v-110v transformer in there for use with u.k. supply.

Okay so. From what I said previously.

On this Denford data page in the 4th post down:
https://www.denfordata.com/bb/viewtopic.php?f=36&t=2929
The schematic shows the 'power transformer' which converts u.k. 240vac into 110vac for the machine.

Micromill-electrical-feb-2000.pdf
https://www.denfordata.com/bb/download/file.php?id=2796
Micromill-denstep-electrical-June2000.pdf
https://www.denfordata.com/bb/download/file.php?id=2795

Look for this in your machine. Could be the overall culprit.