quote:
Originally posted by GGG:
This is an early 2007 Legacy GP-30. It is programmed as #2. I can only see one speed sensor. Only one motor has the tach board. The sensor may be a U shaped with an element inside the tach wheel, but I am not sure. This is a DCDS J "?" board.
The Fly wheel is brass, and the ring is open frame like and impeller. I do think it is metal not plastic. The tach sensor has a diode marking on the back, which is why I believe it is an LED vice magnetic sensor.
If a loss of signal ultimately ends in a stop, I am not sure why the engine is taking off.
I don't think it is a Command Signal issue since all functions work, and the take off is at different parts of the layout.
Latest update is it is working better now. I used a brush and lint free cloth to clean between sensor and fly wheel. Looked like some dust/dirt may have been laying near the base of the sensor. Since the flywheel is like a ventilation impeller, I imagine it is possible to collect dust/fuzz.
It has very good low speed control, and did not take off until a much higher throttle setting ( I was using boost) and when I let go it actually slowed back down on it's own after a short delay. May have just been a dirty sensor.
Jon, information about ODY helps. If it still act up, I guess I will replace the Tach reader board first ($18), then the DCDS ($110 ouch!). Thank you for the input. G
The "U" shaped sensor is actually a dual sensor. There are 4 leads to the encoder board on the motor, Power, Common, Sensor1, Sensor2. I believe you nailed it, that dust (or other foreign material) is interfering with the sensor at higher RPMs. You can remove the flywheel (very small slotted set screw, of which the OGR screwdriver set has the perfect tool) and use a flattened "Q-TIP", to clean the sensor. When placing the flywheel, make sure you don't set the slotted disk too deep in the "U" channel, it should be as close as possible to the bottom of the "U" without touching when rotated - gap to ~ 0.5mm.
I do not believe you have any bad components on the DCDS or Sensor board; but obviously I can't be 100% sure without actually testing the boards.