The present invention relates to a tension monitoring system for a mooring rope in a ship, a brake unit having a plurality of winch drums each winding a mooring rope, and a brake band for friction-braking the rotation of each winch drum, and the tension applied to the brake band A band tension measuring sensor that measures and generates tension information, and a control unit that generates an alarm when it is determined that the band limit tension preset in the brake band is exceeded based on the tension signal from the band tension measurement sensors.
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