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Thread: IPM Alarm

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  1. #1
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    IPM Alarm

    Daewoo 300 Puma Lathe Fanuc 21T has 449 Z-axis INV IPM alarm in winter only. Works fine during the summer. In winter machine must be on for an hour in order to clear alarm. Anybody had this happen to them before?
    Jim Short
    www.tahlinc.com

  2. #2
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    What # does the drive display? Sounds like a fan going out.

  3. #3
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    Aug 2012
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    Hi
    Not sure if you know this or not but the Ipm alarm is usually caused from servo amp transistor module. With problem only in winter I might look into moisture/corrosion on transistor screw terminals aswell as make sure they are tight. The latter is only common with refurb/repaired units. Hope this helps, apologies if not.

  4. #4
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    Quote Originally Posted by underthetire View Post
    What # does the drive display? Sounds like a fan going out.
    The drive shows 8.
    Jim Short
    www.tahlinc.com

  5. #5
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    Quote Originally Posted by seikicnc View Post
    Hi
    Not sure if you know this or not but the Ipm alarm is usually caused from servo amp transistor module. With problem only in winter I might look into moisture/corrosion on transistor screw terminals aswell as make sure they are tight. The latter is only common with refurb/repaired units. Hope this helps, apologies if not.
    How do we identify the transistor module?
    Jim Short
    www.tahlinc.com

  6. #6
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    The transistor modules are big black blocks in the back of the unit.

  7. #7
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    Check The Fan . Inside the Drive .The regenerative Circuits. Also the earth Pit of the machine . The Ground cable. The breaking of Drive . Torque Setpoint.

    prabhatmishra@gmx.com

  8. #8
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    Check out the section of the Fanuc maintenance manual.
    Attached Files Attached Files

  9. #9
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    Solution: Replaced Z-axis drive. All is well.
    Jim Short
    www.tahlinc.com

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