Volvo QL BP900 Bow Thruster switching issue

[[3889]]

Not on my boat so a bit light on details but can anyone suggest remedies to the following problem.
The bow thruster self activated, thrusting to stbd, in a marina about 5 hours after finishing a very wet crossing of the Irish Sea. It was switched off at the helm. When switched on and the joystick moved to port thrust the motor stopped. It reactivated when the joystick was released or moved to stbd. No sign of any moisture ingress at the control panel. There is some damp from condensation around the motor but no obvious leaks. The only action taken so far has been to spray contacts with WD40 to no effect.
Any similar experiences or suggestions on where best to start faultfinding?

 

[MAURICE]

Not on my boat so a bit light on details but can anyone suggest remedies to the following problem.
The bow thruster self activated, thrusting to stbd, in a marina about 5 hours after finishing a very wet crossing of the Irish Sea. It was switched off at the helm. When switched on and the joystick moved to port thrust the motor stopped. It reactivated when the joystick was released or moved to stbd. No sign of any moisture ingress at the control panel. There is some damp from condensation around the motor but no obvious leaks. The only action taken so far has been to spray contacts with WD40 to no effect.
Any similar experiences or suggestions on where best to start faultfinding?

The same happened to me. I took apart the little electric control box that sits near the bow thruster (not the joystick) and sprayed it with electrical cleaner. I then cleaned the wires that go into this box of tricks and reinserted them. So far all seems OK
Maurice

 

[[3889]]

Thanks Maurice. Will try that.
Andy

 

[philip_stevens]

One thing you must do, is to clean the WD40 from the electrical contacts with a contact cleaner. It is a water displacement liquid, that goes sticky once the solvent evaporates.

I had problems with the crane contacts on a ship when I was in the MN. A previous electrician had liberally sprayed the control system with WD40, and when I arrived on the ship, the crane kept running after the controls were at stop. It was the WD40 sticking the contacter poles together until they took their time to separate.

Use WD40 on anything that does not move. Goodness knows why it is so popular!!!!

 

[[3889]]

Thanks, Philip. Followed Maurice's advice and problem solved. Many thanks again - I knew someone would be able to help.