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  1. #1
    Join Date
    Dec 2006
    Posts
    310

    Need Help - Sinumerik 840D system

    Dear All,

    In oerlikon gear cutting machine, cutter spindle is A axis

    Error 25000 A axis active encoder fault appears soon after switching on the system

    We checked following :

    a) Cable continuity from Motor upto 611 control card - found ok in Digital multimeter in Resistance Mode

    Checked continuity between connector on junction box over Motor and cable plugged on encoder found OK

    b) Interchanged control card from other axis (Siemens Part number is same for both the control cards)

    c) Replaced Motor encoder with New one

    d) Old NC archieve loaded to ensure nothing wrong with parameters but same alaram

    Kindly advice what else could be the reason

    Best Regards,

    M. Rishikesh

  2. #2
    Join Date
    Jan 2005
    Posts
    53
    Bad encoder on motor.

  3. #3
    Join Date
    Feb 2009
    Posts
    60
    encoder or encoder cable because this fault start by hardware problem

  4. #4
    Join Date
    Aug 2006
    Posts
    93
    dear sir
    i thinks based on my experience you should check , the counting direction for A axis in NC machine parameter , in 840 D all axis mention by direction to use , you should check it before all .

  5. #5
    Join Date
    Nov 2010
    Posts
    0
    have the active encoder checked, there may be an additional encoder on the axis and not using the motor encoder.

    Could be a Heidenhain ROD type of encoder and yes, they do go wrong.

    If no second encoder, motor encoder is faulty.

  6. #6
    Join Date
    Apr 2022
    Posts
    12

    Re: Need Help - Sinumerik 840D system

    hello, did you found the solution?

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