Mohr 56eco Hydraulic system Overheating

Discussion in 'Cutters and Trimmers' started by Richard Penny, May 27, 2021.

  1. Richard Penny

    Richard Penny New Member

    Joined:
    May 2021
    Messages:
    3
    Location:
    UK
    We have a Mohr 56eco guillotine that repeatedly comes up with a hydraulic system overheating error 993. The guillotine cuts outs after the clamp comes down, but between 3-10 attempts straightaway it will then work.
    Anyone else experienced this as we don't seem to be getting anywhere with Mohr.
     
  2. synthology

    synthology Member

    Joined:
    Apr 2017
    Messages:
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    Location:
    us
    Cause: This error message is issued when the thermal contact of the hydraulic motor
    indicates an interruption during the release of the cut. Since Polar 66 is not fitted
    with a safety bolt the thermal contact is used for generating the signal "safety bolt
    (SB) activated". The SB safety circuit serves to monitor the thermal contact of the
    hydraulic motor.
    Remedy: - Check loading of hydraulic motor
    - Check thermal contact
    - Check cabling
    - Check cutting circuit card
    - K1 on SAP card (contact 11/12)
    - Check 24-V power supply unit and replace it, if n
     
  3. CHOCK

    CHOCK Senior Member

    Joined:
    Dec 2016
    Messages:
    1,957
    Location:
    Managua,Nicaragua
    Hi sir:

    thermal contact of the hydraulic motor indicates an
    interruption during the release of the cut.

    Test :

    Check the power supply from G3

    If the hydraulic motor is really to hot:

    Check safely the conditions of the knife, maybe perform a knife change.

    Check knife adjustment (too deep into the cutting stick)

    Check loading (amperage) of the hydraulic motor M3

    If the hydraulic motor is not to hot:

    Check thermal contact of motor M3 by measuring the resistance at plug SK9, using the
    machine drawings.

    Check cabling of thermal contact inside the hydraulic motor

    Check contact of K1 on the SAP95 board by measuring the supply voltage of 24 V d.c. during

    an active cut at plug SK9.12. The voltage has to be for sure 22 V d.c. This measurement
    has to be done after several cuts as well.

    Change SAP95 only if the above mentioned checks where o.k.

    Change SK95 only if the above mentioned checks where o.k.
     
  4. Richard Penny

    Richard Penny New Member

    Joined:
    May 2021
    Messages:
    3
    Location:
    UK
    Thank you Chock & Synthology.
    Have forwarded these suggestions on to our engineers. Will let you know the outcome.
     

  5. CHOCK

    CHOCK Senior Member

    Joined:
    Dec 2016
    Messages:
    1,957
    Location:
    Managua,Nicaragua
    ok sir

     
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