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KBIC 240 controler problem

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jaker:
Hi All,

I'm not a electrical genius that's why i hope You can point me in the wright direction. I do have a mini mill with a KBIC 240 controler, the mini mill is the XJ12-300 from Amadeal. The mill is in low RPM's  intermittent and some times loses torque in the middle of a milling cut. Any idea what can be wrong. I have checked the brushes and these are ok.

Any idea is appreciated.

Regards,

Jan from the Netherlands,

John Rudd:
Jan,
The kb controller isnt too compliicated, but fault finding without any test equipment and not having it in front of you doesnt help.....
Is the mill under warranty? If so a call to Hugh at Amadeal might help...
So, options,buy another controller or else have yours repaired....

jaker:
Hi John,

Thanks for Your reply. I do have a multimeter. The mill is out of warranty but i opened the site of the mill and found the controlboard and i have seen the potmeter. I think there is something wrong with the potmeter, i saw black sud under one connector, so i wil check that tomorrow. Maybe a new connector could be a problem solver. Otherwise i order a new potmeter from Amadeal.

Regards,

Jan,

John Rudd:
Jan,
The speed pot is connected to P1,P2 and P3 on the pcb.....you could check the connections, making sure they are secure.  :zap:

The speed pots are known to fail, I've changed mine twice during the life of my machine.... :scratch:

Keep us posted on your progress.... :thumbup:

jaker:
Hi John,

I took a closer look at the potmeter and turned it verry slowly up, seems like there is something wrong with the wiper, i suspect not good contact. So i looked at the WD40 can i have and found out it is usable as a contact spray. So i gave it a try and sprayed some in the potmeter. It looks like the problem is solved. I'm a happy man.  :) :)

Thanks for your advise,

Regards,

Jan,

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