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masterdrive or motor bearings problem ?

Created by: Patrikk at: 12/18/2009 9:24 AM (7 Replies)

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12/18/2009 9:24 AM	Rate (0)
Patrikk Posts: 131 Rating: (1)	Dear all, we have a masterdrive 6SE7031-0TE60 that is feeding a third-party motor. after two month of motor operation, the motor has blown up and we saw that the problem came from the bearings. So, now we are ordered a siemens motor to put it with the masterdrive. but we are afraid that the problem happen again. So, wat can we do in the masterdrive parameters to protect or make a tripping against those bearings failures?
Patrikk Posts: 131 Rating: (1)
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12/18/2009 9:55 AM	Rate (0)
Mircea Posts: 16 Rating: (0)	Hello! In the first of all you must have a good preventive maintenance plan for that motor. You must see if the motor is properly installed and if the motor is properly selected for the load requirements. When are problems with the bearings the motor is overloaded;this is seen on the current drawn by the motor(overload current). Best regards! Mircea
Mircea Posts: 16 Rating: (0)
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12/20/2009 1:21 PM	Rate (0)
sameh Posts: 5 Rating: (1)	i think you must check the old bearing: is there a suitable quantity of grease or not then you have to obey good preventive maintenece schedule secondly what about the alignment is it right. in many case the bearing damag causes are mechanical after that you have to measue the drawn current duing the normal operation then u can decide if it is electrical or not regards
sameh Posts: 5 Rating: (1)
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12/20/2009 1:31 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	Patrikk Dear all, we have a masterdrive 6SE7031-0TE60 that is feeding a third-party motor. after two month of motor operation, the motor has blown up and we saw that the problem came from the bearings. So, now we are ordered a siemens motor to put it with the masterdrive. but we are afraid that the problem happen again. So, wat can we do in the masterdrive parameters to protect or make a tripping against those bearings failures? If the motor has a higher consumption (some 10kW), insulated bearings are necessary!
IBN-Service Posts: 8946 Rating: (1000)
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1/5/2010 3:24 PM	Rate (0)
ss313 Posts: 7 Rating: (0)	What type of bearing failure did you have. If it came from lack of grease or a defect part then you should not have a problem? Do a search on Google for "vfd bearing failure" and you will learn more than you want to know. It is possible that you have rotor currents that are crossing the bearings and causing the failures. In this case you will need a motor that has Insulated bearings or a shaft grounding kit.
ss313 Posts: 7 Rating: (0)
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5/14/2010 4:39 PM	Rate (0)
pravin.pande Posts: 13 Rating: (0)	Bearing is damged due to harmonics. To protect bearing from harmonics use insulated bearing.
pravin.pande Posts: 13 Rating: (0)
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5/16/2010 10:53 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	pravin.pande Bearing is damged due to harmonics. To protect bearing from harmonics use insulated bearing. Yes, like already said.
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5/18/2010 7:52 AM	Rate (0)
Shivaji Patil Posts: 140 Rating: (1)	Gentlemen, I would suggest alongwith above measures to protect the motor from elctrical side aswell. Is the motor self cooled or forced colling? Do you have thermal winding protection embeded KTY type or so? So that you can monitor the winding temperature and set the alarm for 110-120 degree in the software of simovis so you before failure you can judge some thing wrong onthe motor side. You can set the alarm and fault at differnt temp values of motor. Cheers !
Shivaji Patil Posts: 140 Rating: (1)
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