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Recently I had a fail with my electric motor installation on my yacht which I couldn't immediately diagnose. Subsequently I had a diver cleaning the anti-foul and he found masses of fishing line wrapped around the propellor. It was apparently quite tight and while he managed to remove 90% of it and got the propellor to rotate, I still can't get the controller to respond. I have looked at the fault finding led on the controller casing and when the key is turned on I am getting multiple flashes far in excess of anything in the manual and then fades out. Given that I seem to have full charge, fuses intact and nothing appears during visual inspection I am at a bit of a loss on how to proceed. I am tipping that it must have got overloaded with fishing line jamb and that some sort of overload has been tripped...

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Any have any thoughts?

Hello Tim,

Are you able to count the flash on the SEVCON ? You must have between 1 and 15 flashes (see in the attached file).

It is preferable to connect to the controller via the CAN bus and IXXAT's USB-to-CAN interface and DVTC software...

This is a very interesting case: propeller jamming. The drive will send the programmed maximum torque and wait for the motor to turn. The motor and the drive may heat up, so we should have a thermal cut-out, or a control law that says “STOP, the motor hasn't been running for too long...”.