How do I find the fault

Gallery, Projects and General > How do I??

<< < (3/4) > >>

John Rudd:
Lyle,
What speed controller do you have fitted?
I thinking it's the KB unit, if so you nay need to adjust the trim pot on the board marked MIN, adjusting it slightly (one way or 'tother ) will move the starting point at which the motor begins to turn (or hum.....).....you may even need to adjust the MAX trimmer to achieve the same speed as before....Differences in motor characteristics.....

lordedmond:
Lykle

what is your mains voltage ?

if you are on 240 vac and use a phase and neutral system as we do in the UK

you say the motor is not a bolt on replacement have you got the correct motor for your machine the new ones are brushless and will not work on the old controller for one thing they are a different voltage is the new motor black or finned ali

I know from your other posts you have a brush motor and you need the black one

Stuart

Lykle:
Thanks John, I will have a look at the Pots.
That probably is it. I think that will also solve the fact that the motor wants to turn a little after I switch it off.

Stuart, thanks, yes I have the black one, with brushes. It runs fine, no issues there, it just hums. As I said, it probably is normal, but I am so focused on the motor now, that maybe I hear it now where I didn't notice it before.

Cutting ability seems to be better than the old motor, so i am happy there.

Lykle

lordedmond:
Glad you have the correct one

the hum may just be a poor varnish soak which would douse a loose lamination

to do the varnish ( its not really varnish but a heat cured thin epoxy ) that the stator armature is doped in under a vacuum then stoved to set it

it use to be the apprentice job before you when on to winding per say

Stuart

Lykle:
Final update

Yep, tweaking the Pots helped a lot.
No more hum at the start and now I also get a lot more revs out of the motor.

Happy with the result, thanks all you guys. It has been a great help.

lykle

Navigation

 Message Index

Go to full version