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Hi,

I had a problem with one of the servo on my mill (x-axis) but the table was able to move normally. I teared down the servo and reassembled it. Now the servo don't work at all. There is no fault, or led error on the drive. I surely missed something but what ?? Somebody can help me with that one ??

oh and it's a AC servo! (Sorry for the error)


Thx a lot guys!

[Al_The_Man]

What Control? Who's drives?
Al.

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Where i can get this info ?

IT's a C-tek controlled milling.

[Al_The_Man]

There must be a brand name on the controller rack or processor, also the motor Drives should be identified by either brand or part number, these should be found by the motor cables terminating on them.
OK I think I found them, they have a Taiwan site. Do you have service manuals, I notice they have those also in pdf.
Al.

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ok wait i goo see

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The drive are Gre Pwr i think and It's ac.

The servo motor are 1kw

[Al_The_Man]

To do any constructive fault finding, you need the maintenance manual and/or schematics.
If there is no error, I would see if the control is outputing an analogue signal if this is the method used, also all power and indicator lights on the drives are OK.
Al.

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But When I reassembled the motor, is the control on the top of the motor have a special position.


I have the manual

[Al_The_Man]

But When I reassembled the motor, is the control on the top of the motor have a special position.
I have the manual

What do you mean by control? Maybe post a pic if possible.
Al.

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The little thing who position the motor (mounted at the end of the motor shaft)

[Al_The_Man]

Depending on the age of the servo's you may have just an encoder or if older a 2 wire tach also, But IF just an encoder, then it should not matter about orientation, the marker pulse may be off, thats all, that would give you a slightly different home position, but should not stop it working.
Most controls give an alarm message if the servo should be moving and it is not, or the encoder feed back is either bad or missing.
Does the display change position when you attempt to jog the axis?
Are you sure they are Brushed DC and not DC brushless motors, as that could change things.
Al.

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First i want to thank you for you help, very appreciated !!

Ok i tried something.

First i start the machine and put it on, after that i hit stop bouton, move the motor by hand a bit then put on the machine again. The motor start to spin by his self. I hit stop again, to stop the motor and On again to try to jog the axis. But it can't jog like the computer lost is position between + and -.....

conclusion motor work but i think maybe the drive is lost and /or the computer is there a reset or a manual placement of the zero. (Just if you have the princip)

Thx dude great help !!!

Francis

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While checking the electronic diagram I saw I was wrong it's not dc but Ac.

I think i misplaced the encoder because I moved it a bit and I was able to control the motor a fews 0.060 but it stop proptly and i was unable to move it again...


Al help me plzz !!

[Al_The_Man]

Unfortunately, if it is an AC servo and the commutation pulses are on the encoder, you will probabally need the manufacturers procedure for alignment.
Some use a method of DC exitation to position the armature, others by 'scope.
It makes it easier when they either mark the motor shaft or key the encoder for orientation.
Is a simple type coupling method used?
Al.

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The encoder slide on the shaft, it have two set screw to lock it. One goes i a flat on the shaft the other one direct on the shaft.

I think i will bring it to an electromecanic shop Monday !

[Al_The_Man]

If it is a through-shaft encoder, you have to make sure of the encoder disc spacing, make sure it is not touching the upper or lower part of the read head, if the shaft has a flat, it may indicate that one of the set screws would be aligned with that, did you try both set screw positions on the flat?
Alternatively, look for previous shaft marks where the set screw has been.
Al.

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I tried both but tomorow I wil look at it mor closely.

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Al I have some news, I switched the x motor (bad) with the y (good) and it worked perfectly. Conclusion all motors are good. But the x axis always refuse to work. I switched the drive with the z one and now neither the z or the x work .... is there a way to reset the drive or is it the computer who records the position ???? Help plzzzzzzz

[Al_The_Man]

Unfortuately I am not familiar with the system you have, but some drives are 'semi-intelligent' and can be configured by software, others are just passive drives.
I would look at what it will take to test the motor and drive on its own, and not under the influence of the controller.
Al.