ST60 Rudder reference transducerDescription
The Rudder Reference transducer (M81105) contains a single-turn 5k ohm plastic
potentiometer to provide the autopilot with rudder position information. When the
unit is replaced, correct installation is vital to achieve optimum steering
performance. Transducer arm movement is limited to +/- 60 degrees. Care must be
taken to make sure that the arm is opposite the cable entry when the rudder is
amidships. Failure to do this could result in damage to the rudder reference
transducer if the arm is driven onto its stops by the steering system.
Faulty rudder reference transducers should be replaced as a complete unit.
disconnects the rudder reference transducer from the autopilot and check for
Cable color Arm position Resistance
Green/red Any position 5k ohm +/- 5%
Blue/green Anti clockwise stop 1.66k ohm +/- 10%
Blue/green Clockwise stop 3.3k ohm +/- 10
My Raymarine rudder position sensor resistor is shot. It needs a new internal resistor. The Raymarine site I looked at shows this,
If you imagine a pot with 3 terminals with three wires extending, red, blue and green,
From red to blue is 5000 ohms, from red to green is variable linear 1500 to 3500 ohms
From Green to blue is also variable linear 1500 to 3500 ohms.
I hooked up a test rig that simulated these values from resistors I bought at an electronic store. It worked fine. If I put another resistor from red to blue it showed the rudder position on the display, I also changed the resistor green to blue and the rudder displayed full scale in the other direction.
I have been doing Google
searches for days looking for a pot of this type with no luck, the closest I came is a company named www.digikey.com
which sells thousands of electronics
components, the also have an on line chat which I will try out on Monday.
Any ideas where I might get of these resistors?