Main drive d.c motor vibration/sound R706 LTTLV series 747

Discussion in 'Man Roland Printing Presses' started by Asim Shehzad, Mar 18, 2021.

  1. Asim Shehzad

    Asim Shehzad Member

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    Hi,
    There is sound of vibration from the motor during every stop ( Emergency stop, safe stop, after inching Forward and Revers when machine stops and same with crawling ).

    Also when machine reduces its speed from high to low speed (3000 Sh/h basic speed) while in production, washing the rollers and in Idle mode.

    Always there is sound and vibration just before completely stopped main motor/machine.
     
  2. Asim Shehzad

    Asim Shehzad Member

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    please share your valuable words for possible causes
     
  3. CHOCK

    CHOCK Senior Member

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    Hi sir;
    1) I recommend to take out the main motor to the machine shop, for Diagnostic, maintenance+lube+exchange ball bearing+cleaning + and others.

    Every electrical motor need Maintenance every year !!! Otherwise, the motor can be faulty,or burning.

    Thank you in advance, sincerely
     
  4. Asim Shehzad

    Asim Shehzad Member

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    Hi sir,
    thanks for your reply.
    we took motor out for service already, changed ball bearings, carbon for armature supply and repaired armature.
    I'm adding here about BKF12 Baumuller dc drive, this drive is repaired after blast in the power stage. so could be the reason for this issue?
     
  5. mendietta

    mendietta Senior Member

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    Check speed alighment, check encoder...
    RTR switch on 5
    On 7.segment display check numbers, it must be near 0, both numbers.
    Run machine on idle run, 3000,6000, 9000
     
  6. Asim Shehzad

    Asim Shehzad Member

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    Speed alignment done already on different speeds 3000,6000,9000 and 16000.
    Master file of parameter ser has been loaded.
    Only encoder B150 some times malfunctioned as speed reading malfunction mostly when machine in ppl mode. I have ordered new encoder already but I don't think it caused for vibration/sound in the main motor.
     
  7. mendietta

    mendietta Senior Member

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    Change encoder. If motor is serviced and BKF is parametrized then you have some mechanical problem...
     
  8. Asim Shehzad

    Asim Shehzad Member

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    Mr. Mendietta
    I explained vibration/sound from main motor only when its going to be stopped. What mechanical problem probably caused for it?
     
  9. mendietta

    mendietta Senior Member

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    I dont have other explanation if main drive and motor are OK...
     
  10. CHOCK

    CHOCK Senior Member

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    Dear Sir:

    In reply to his answer,about issue of Motor severe Vibration :

    1) The machine shop , must review the High mica between commutator bar for Noise or Vibration

    2)Dirty commutator or is out of round.

    3)worn brushes and/or annealed brush springs.

    4)Open Circuit or short circuit in the armature winding!!!!!

    5)Short or grounded armature winding.

    This is are the issue for severe Vibration



     
  11. bLuuR

    bLuuR Member

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    I would change the main encoder, try to mesure it, but replace it to be sure. It is not expensive.

    Maybe check the brake assembly when you remove encoder and if worn replace brake too.
     
  12. CHOCK

    CHOCK Senior Member

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    Please do the steps before mentioned;

    Dear Sir:

    In reply to his answer,about issue of Motor severe Vibration :

    1) The machine shop , must review the High mica between commutator bar for Noise or Vibration

    2)Dirty commutator or is out of round.

    3)worn brushes and/or annealed brush springs.

    4)Open Circuit or short circuit in the armature winding!!!!!

    5)Short or grounded armature winding.

    This is are the issue for severe Vibration

     
  13. Asim Shehzad

    Asim Shehzad Member

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    Dear Sir,
    thank you so much for your valuable words.
    i will take the steps in my next visit to customer and then will keep you informed.
     
  14. CHOCK

    CHOCK Senior Member

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    Ok Sir

    Blessing
     
  15. Ahmed abo salah

    Ahmed abo salah Member

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    I think you must change the encoder
     
  16. drukman

    drukman Senior Member

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    Is this a new installation of the machine?
     
  17. Asim Shehzad

    Asim Shehzad Member

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    no sir this trouble i faced during production ( while machine was printing).
     
  18. sergios68

    sergios68 Member

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    have you replaced the encoder mounted at main motor? normally vibration is caused by a defective encoder
     
  19. Asim Shehzad

    Asim Shehzad Member

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    Dear gentlemen,
    Thank you so much all of you for your kind support to resolve below issue. I had changed the encoder for main motor but problem was still remained. Additionally customer was facing a critical problem in Baumuller de drive unit as it had a blast in power unit and the thyristors burnt then (even broken), and that shot circuit leads trouble to K050 main contactor and main power breaker. Finally I found problem with baumuller de drive unit. From Manroland we received the modification of Siemens 6RA80 instead of Baumuller BKF12. Siemens 6RA80 is currently installed and machine is working normally.
    upload_2021-7-27_10-58-20.png
     

    Attached Files:


  20. CHOCK

    CHOCK Senior Member

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    Great Sir!!

    Good Job.

    Blessing
     

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