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Yaskawa varispeed trouble

Discussion in 'Repairing Electronics' started by fertronic, Jan 17, 2011.

  1. fertronic

    fertronic New Member

    Joined:
    Jan 17, 2011
    Messages:
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    Dear friends

    I was checking a Yaskawa drive reading components by a multimeter, but now when I turn on the driver appears the alarm mesage "SC" and i see in the manual this means the motor is short circuit, but i never connected and i don't have any motor wired to the driver. I've tested the IGBTs module again but the readings are well. Before this failure, during the normal operation works well but the problems occur in the start specially for low frecuencies (under 30Hz) because the driver can`t start up the motor. We have change the power electronic card "ETP615063". Measuring the voltage output disconnected the motor one of the phases is 1/3 part of the other phases so we are thinking the power module of IGBTs have the cause but we need your help to find the exactly problem. Any suggestion?

    One interesting topic is in the output of this drive before the motor it is connected a contactor. I think this is could be the cause to the drive failure.
    Additional I need to know if the control card of this drive or the entire driver it could be replaced with a new, because I don`t know if it has a special configuration for the Modbus communication with the controller from the Machine. The exactly model for this driver is:

    YASKAWA VARISPEED 616 PC5 200VCA 5,5Kw
    Model #: CIMR P5D25P5
    SPEC: 25P51A

    The machine when is working the driver is a Knitting circular machine brand MAYER from Germany. I give you the video link where you could see the machine where the driver was in:
    https://cid-6c32ac1c55dd4b2d.office....&Bpub=SDX.Docs

    Thanks for your help.
     
  2. sansgp

    sansgp New Member

    Joined:
    Jul 13, 2009
    Messages:
    7
    Likes:
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    Location:
    Singapore
    Hi,

    The original problem you mentioned could be due to malfunction of Gate trigger circuits for the IGBTs. Usually it comprices of hybrid modules, that isolates the logic circuits from the power circuits. You could check these parts for problem with oscilloscope to actually find out which module has failed.
     

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