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Hi Peter and all,
Attached pictures of the 4 relays we currently have installed on our A54.
We couldn't find any references for the brushes. Pls let us know if you have made any progress on this since your last email.
On 16 June 2018 at 14:11, Peter Forbes ppsforbes@...
This forum is just amazing - I have have just had the same problem [Bow Thruster] (lots of carbon dust and therefore probably worn out brushes) not the one side thrust (but that’s interesting too). On Carango A 54#035.
Can anyone tell me the part number or description of the relays I should have as spares (I am away from boat for now) and also the part number or dimensions of the brushes which I am sure need replacement.
I presume the springs have to be removed to change the brushes?. Quite a fiddle job as the screws are so small with large hole beneath and some on the aft, difficult to see side of the motor,
River Azul South Brittany, France
Hi Bill and 54 owners,
The issue with the Port-only-thrusting was resolved by removing and dismantling the double-solenoid power relay. After cleaning the contacts with sandpaper and corrosionX-ing the springs, it functioned correctly again. The issue was confusing because each relay would behave correctly independently (connecting the top posts and disconnecting the bottom ones) but activating the starboard one would cause the other one to loose its bottom (idle) connection(!).
Some more info I gathered in the meantime:
* The front relay (red and blue wires) is activated for starboard operation. The back relay (red and grey wires) for port.
* Power cables are marked A1, A2, D1, D2. A1 and A2 are the stator posts, D1 and D2 are the rotor bobin posts.
* the rotor and stator circuits are in series.. The voltage of the rotor is reversed depending on direction.
* A1 is permanently connected to batteries Neg. A2, D1 and D2 are controlled by the relays.
* on idle, A2, D1 and D2 are connected together.
* on Starboard, the front relay connects D2 to batteries Pos (top posts). A2 and D1 are still connected by the bottom posts of the back relay. Circuit is: Pos=D2-rotor-D1=A2-stator-A1=Neg
* on Port, the back relay connects D1 to batteries Pos (top posts). A2 and D2 are still connected by the bottom posts of the front relay. Circuit is: Pos=D1-rotor-D2=A2-stator-A1=Neg
Hope that will help,
Fair winds and happy thrusting
(Oh, and the ground circuit leak got resolved too in the operation. Not sure exactly how, but it did)
AMEL 54 #122
I agree the motor is probably fine, as it can run in one direction.
I can hear the big Albright double-solenoid motor-reversing contactor click for both starboard and port operation. So joystick is innocent.
I think i know what 4 relays you mean (in the plastic junction box) but didn't foresee they played a part in the thrusting operation. I assumed it was only the raising/lowering of the thruster, and that my problem was closer to the Side-Power unit.
I measured voltage on the Albright contactor posts in port/starboard/idle operation to see if I can reverse engineer what is supposed to happen to the 4 power cables going into the motor.. Need to look at the results with a fresh pair of eyes in the morning. And maybe I'm barking up the wrong tree.
AMEL 54 #122
It is probably not the motor and is either the joystick or one of the 4 relays.
Eliminate the joystick first....
It is unlikely that your relays are numbered because out of about 10 54s, I have only seen 1 with numbered relays, but they are all the same relay. If all 54s are wired the same, I think it will be relay #2, but, if you have a spare relay, it is easy enough to replace them one at a time until you find the culprit. Of course the problem can be corrosion between the relay terminals and the female spade connectors.
If I owned a 54, I would have 4 spare relays.