Hi Olly,

From my experience of the CL300M motor which is a slightly lower rated version of the original X2 (not the same motor as X3 or super X2).

Obvious symptom of motor problems is erratic running at very low speeds. Try getting it to run as slowly as possible, if it hesitates or jerks with the spindle at about 30 rpm, then there is probably a winding problem.

Testing is a bit tedious. You need to remove the motor, then take out the brushes (behind round black caps) then take off the end cap and remove the armature, having care not to lose the round shim spring washers that provide light end support to the bearings.

First check the commutator is in good condition – undamaged and no metal has smeared across the gaps to create a short.

You can now measure the resistance between each pair of segments on the motor commutator with a meter capable or reading down to a few ohms.

Virtually zero resistance indicates a short.

From memory, figures of about 3 – 4 ohms are right (I may be wrong about this but you will definitely get an 'ohms reading' from OK segments).

If TWO windings are blown, you will get two places where there is no continuity.

If ONE winding is blown this will be less obvious but the readings will vary and be noticeably higher as you cross the gap'.

I have brought one of these motors back to temporary life by shorting across blown windings, but this is a foolish thing to do and I don't recommend it unless you are a fan of white smoke or want to blow another board.

Neil

Edited By Stub Mandrel on 11/03/2013 10:20:23

Hi Olly,
I few years ago the motor failed on my X3 mill. I have documented the tests I did and information I put together about the motor and controller. (Including tracing the schematic of the controller.) I have put all of this information in a folder called "X3 motor and controller" in the file section of the Yahoo groups X_series mills forum. You have to join the forum to access the file section. If you do not want to do so then I can zip all the files up and put the zip file in my public folder on Dropbox. I can then give you a link to access the zip file. Let me know if you would like me to do so. I would not reccomend that you try to fault find the controller board as it is all at mains potential. The only safe way to work on it is to run it from a floating power supply.

Les.

Hi Olly
If you are like me and not a spark please be very careful about above suggestions. I would be a bit patient and wait for Ketans man to get back.
Regards
Bob.

Well done Ketan once again
Bob.