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SINUMERIK CNC automation systems

Problems running new and repaired motors on 840D.

Thread Starter: spadan   Started: 6/2/2008 9:00 PM   Replies: 3

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  6/2/2008, 9:00 PM
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 Our customer sent two 1FT6041-4AF71-4AH2 motors for repair at our certified Siemens motor repair shop. When the motors came back they start humming and shutting down with multiple alarms, 25030,27010,27023,27024,300901,300907,300900.The machine presently works with the same type motor which comes from another machine of the same type, while the other motors were sent for repair. The motors that were repaired were tested at the authorized repair shop and worked properly. The system these motors work on is an 840D NCU 572 version 04.04.37. 611D drive 6SN1118-0DH23-0AA1. To be sure the repaired motors are not at fault, the customer ordered and tried a brand new motor from Siemens Germany exactly the same as the others and it also did not work and faulted out the same way. Any ideas would be greatly appreciated.
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  6/3/2008, 4:02 PM
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Hello Spadan,

I haven't been on the forum much lately and sorry for now getting back to you earlier.

When I reviewed your alarms, I think you should go to the service displays on the 840D.  There you'll find that you can monitor both the velocity and the position feedback for the axis you're having problems with.  You should attempt to rotate the motor shaft by hand when the drive is not enabled.  If you turn the motor shaft clockwise, you should know what direction to actual counts on the CNC should be (i.e., + or -).  Check to see that both are working correctly.  If not, you may have a polarity difference or a bad encoder cable connection.

It sounds like the feedback of the encoder is not in phase correctly.

Hope this helps...

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  6/3/2008, 4:47 PM
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Hi Dave, Thanks for your response, I have informed our customer and he will give your response a try as soon as he gets the machine to do it. I will let you know what happens when he gets back to me.

Thanks and Regards,

Spadan
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  6/7/2008, 4:29 AM
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Hai I Think Your Problem in Power Cable sequencly connected  . Please Check the  U V W  from Drive to Motor


Regards
Dharma
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