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SIMOVERT MASTERDRIVES

Knocking Sound In Motor controlled with Simovis master drive CUVC control

Thread Starter: Shivaji Patil   Started: 4/25/2012 6:49 PM   Replies: 11

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  4/25/2012, 6:49 PM
Shivaji Patil
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Dear Experts,

I am facing a strange problem with one of the motor in a Line which is controlled by Masterdrive inclosed loop control.
Motor is running and taking norml load but the I see the actual value of speed ru14 is varing toomuch by 10-12 rpm and if I touch the motor it gives knoking sound like ?
I am sure what could be wrong ?
I have checked Encoder,cable,coupling etc it is fine.
can somebody suggest solution for this.

Best regards,
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  4/25/2012, 8:14 PM
IBN-Service
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Bearings?

Also some EMI - disturbing noise on the encoder line can course some knocking noise.
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  4/26/2012, 3:10 AM
Vithani
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As IBN said, Bearings could be main problem

Else, check motor without Load. Which control Mode you are using? if it is VC then perform Optimisation again

Regards,
Devesh
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  4/27/2012, 9:07 AM
Shivaji Patil
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Speed regulation with Encoder with following parameters
P100=4
P130=11
P235=10
P236=10
p240=100
P536=100
P537=100
I have done Motor Id at Stop with P115=2.
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  4/27/2012, 5:56 PM
Vithani
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Well, also perform Controller tunning P115=4 & 5

And what about bearings? have you checked? Motor fan may be?
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  4/28/2012, 11:03 AM
Shivaji Patil
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Dear Sir,
One question do we need to disconnect the motor from its gearbox for  optimisation tests?
I have checked bearings,fan etc it is O.k.
Best regards,
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  4/28/2012, 11:16 AM
timmyLDeng
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ShiRaPatil wrote:
Dear Sir,
One question do we need to disconnect the motor from its gearbox for  optimisation tests?
I have checked bearings,fan etc it is O.k.
Best regards,


For the stationary Motor ID you will not need to disconnect. If you want to do the rotating then I would advise to disconnect from the gearbox.

Does the motor make a knocking sound when disconnected from the gearbox?

A way to eliminate to find out if it is the bearings or the drive would be to disconnect the gearbox and run the motor to full speed. Coast the drive by removing the OFF 2 signal. The motor will then spin down to a stop. During this time if the noise is still there then it is a problem in the motor.
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  4/28/2012, 5:54 PM
Graeme
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Agreed, check the motor for knocking noises off load.

Also, using the Drivemonitor trace function, you can observe very closely what is happening in the drive. You can monitor the encoder feedback, the drive setpoint, the actual speed and then you can see if the torques are swinging wildly and causing rotor knock.

Another thing to check which most people take for granted is the motor shaft / encoder coupling, this can slip if it is a non standard coupling. If however, it is a taper fitting, then this is unlikely.

Regards,
Graeme
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Thank you for this post from:
Vithani
  4/29/2012, 7:19 PM
Shivaji Patil
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Dear Sir,
Thanks for suggestion.
I have replaced both motor and invertor for this position in line.
But still we have the problem . this motor is in line and speed correction is coming from the loadcell.
I feel the loadimpact is something like pulsing load?Suddenly causing speed to drop littlebit and ,correction goes higher and it forms some kind of small oscillation ,It is not getting stable as expected. I am still trying to find the cause for this.
Any suggestion for adjusting parameters in Simovis to meet such kind of load?

Best regards,
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  4/29/2012, 8:19 PM
Vithani
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well, I guess you need to tune your drive for this sudden change

Question - you said speed correction is coming from Load cell - how it is correctig? I mean what kind of Input it is giving to drive?

Does your motor have its encoder? and if yes is it connected with drive itself? I assume answer is yes then One thing to be checked is current of drive. Does it oscillate too when your speed oscillate?

If oscillation is very high, optimisation on Load can help you to tune more

Regards
Devesh Vithani
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Thank you for this post from:
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