SORMZ M1 Brushless main motor with unusual humming sound

Discussion in 'Heidelberg Printing Presses' started by pressmachines, Apr 20, 2019.

  1. pressmachines

    pressmachines Member

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    Location:
    Philippines
    Hi,
    Have a newly arrived Sormz with less than 20 million impressions with M1 Brushless main motor, it has a very unusual humming sound, as if there is a fluctuation of electric voltage / current suppyling the main motor, but when tested with a tester the voltage supplied is constant does not fluctuate. The voltage increases and decreases, and is constant, as the machine is speed up or down. The motor was disassembled for checking the motor technician did not find anything wrong with the bearings and inside motor is very clean. Any help on this is very much appreciated.
     
  2. junker1984

    junker1984 Senior Member

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    Hi Michael, I've not seen an S press with the brushless drive, but are you certain you're incoming power is within spec? What is the voltage of the drive, and have you measured secondaries?
     
  3. pressmachines

    pressmachines Member

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    Location:
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    The power from main electric breaker is 220V 3 phase supplied to the machine, all other motors ( feeder and delivery, blowers, vacuum pumps, powder, refrigeration and recirculation of the machine require 220V ) . Please see attached photos. Just now the motor was assembled and reinstalled again on the press (after it was disassembled to be check) there is a big improvement in the sense that the humming sound is now fainter as the machine speeds up until its practically gone unlike before ( it was disassembled ) the humming sounds gets louder and louder as the machine speeds up. But the humming sound is still there at low speeds. The tech who checked the motor said he has a customer with same model machine with this kind of a motor, he said there is no humming sound whether the motor is in low or high speed . Don't really know what happened, tech said he did nothing. What do you think any ideas.
     

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  4. junker1984

    junker1984 Senior Member

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    Stability of motor mounting plate attached to press? All bolts tight? Was the feeder shipped without being removed from main machine? Is your power supply in the Philippines 60hz?
     
  5. CHOCK

    CHOCK Senior Member

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    Hi sir:
    Good day, hope you are well in union with his family.
    After reading carefully, by your comments, please observe this and take this test -steps:

    1) If you fluctuation of voltage is severe more to 10% or less, you must call the Utility company of your country. Since the Input for the machine the fluctuation will be NOT more increasing or decresasing in the range of tolerance from 10%.

    2) Please test the input to the main transformer; in the case main transformet T1. and try to adjust the TAP of the primary of Trafo, as according.

    3) Since the Higher or lower voltage to due the severe fluctuation will be affecting too : control transformer T6, this affect and damaged possible to the compact module package KLM 7,5 OR KLM 15, since you say that your machine is S- offset Brushless Drive, This board rectify the 3 phases supply Voltages, feed to the 6 power transistors, that at the same time Supply to the main Motor M1, according to the adjust electronic control from board AUK +HRK2.Use the schematic diagrams.

    4) In other words, you must test the KLM +AUK +HRK2, and the main motor. Most of the time, the internal winding in the Rotor of the motor in overheating,: there is NOT exist instrument to troubleshooting this kind of problem, and that case must take a new winding rotor or stator, after you are sure, the problem is NOT electronic board as damaged as product from the Fluctuation of Voltage in your building.

    5) I Strong recommend you install from Heidelberg: Relay fluctuating Voltage, in your machine to avoid ulter problems.
     
  6. pressmachines

    pressmachines Member

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    Location:
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    I will have to check on the stability of the motor mounting plate attached to the press when I get it tomorrow, just to be sure. I am almost sure that it is stable, yes the bolts are tight. The feeder was shipped removed from the main machine. Yes power supply in the Philippines is 60 hrz. Just in case any more suggestions to check. Hear from you soonest.
     

  7. Mathew

    Mathew Senior Member

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    Location:
    Kolding-Denmark
    Hello everyone,
    The humming sound or noise is very common on these type of motors. But just to be sure if everything is running well. Run the press in Crawl speed, then loose 4 TORX Head bolts of the encoder, mark the set point of the encoder to the base, try to turn it clockwise or counterclockwise gently until you hear the noise is reducing. Don't turn it too far from the set point, otherwise the motor starts vibration.

    Let us know the results.
    Goodluck,
     
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