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STo alarm fault code in yaskawa GA800 drive

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Cause : Safe Torque OFF comes when there is internal damage to the two safe Disable channels or Safe Disable inputs H1-HC and H2-HC are open.

  1. Make sure that the Safe Disable signal is input from an external source to terminal H1-HC and H2-HC. 
  2. When the Safe Disable function is not in use, use a jumper to connect terminals H1-HC and H2-HC.
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