A retrofitted capacitor caused a bow thruster frequency drive to overheat – DP observation

Comments from the report:

A wrongly installed extra capacitor at the bow thruster frequency drive caused overheating of this equipment. The extra capacitor was installed by the electrical designer and supplier of this equipment. It was also removed following consultation with the original equipment supplier.

Considerations of the IMCA Marine DP Committee from the above event:

  • Further investigation should be initiated, including the supplier/manufacturer, as to why the extra capacitor was installed and whether another solution is required to ensure the thrusters function correctly in the future
  • Vessel operators should ensure that a robust management of change procedure is followed
  • A good response and sequence of events taken to minimise escalation
  • A good choice and use of position reference systems is noted.