The Shop > Tools
X3 Milling machine Motor Overheating and tripping house RCD
raynerd:
Ok I've done the lamp test and no problem:
Thanks for the offer to test the motor John but in Colne their is a motor place, might try and pop there. If the lamp test has worked as it has, I presume it means I have isolated the motor as the issue.
bertie_bassett:
have you tried running the motor off the machine, now that its clean of carbon dust?
might just be a few small issues causing it to trip out
lordedmond:
Chris
That test looks ok
Danger Will Roberson :D. If you do take it to the motor shop make sure that you tell them is a 180 volt DC motor , I know of a couple that have been damaged by motor shops not reading the name plate and testing on AC .
These are not a universal motor as they do not have a field winding they have permanent magnet fields
Have the RCd tripped again ? When you touched the machine
Stuart
raynerd:
Hi guys,
Took the motor in at 8am this morning and they rang me at 12 noon saying the motor is unquestionably dead - apparently there are shorts to the armature from the wire and hence why it is tripping my house RCD. They said they could repair it but they would have to send it to their repair facility and it would cost many hundreds to get it rewound and I`m better just buying a new one. I said I could get a new one for £160 which made my eyes water but he said at that price I should snap their hand off. He didn`t charge but I gave him some beer money for the diagnosis.
So the motor is dead.
As always, I appreciate everyones help - it was very well received. Thanks Stuart & John for all the detail as well as everyone else that has chipped in. I`ll let you know when I install and new motor and hopefully the issues go away.
Chris
PekkaNF:
The way I see:
Nothing wrong with wellmade DC motors that has brushes and commutator, but chinese motor and speed controller is a temporary solution.
Do you want commit to a temporary solution?
Alternative is more work, but robust three phase AC induction motor can be had about same price. Also new VFD is more or less same money than the speed controller that is going to break next....Just don't buy cheapest e-bay specials, but a brand name, it really does not pay off to save here last 10-20 whatever currency you have.
There is some work ofcourse and I understand that electrical installation is not trivial. But that what I would do, but then again: I'm and electrical engineer and I may fail to see the problem on your eyes.
Hope it will work out fine,
Pekka
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