(
Spotlight,
Products,
Support, 02 February 2011)
Normal Operation
No Speed Signal
When you first power up the control system in Auto with the engine stopped, you should see the FINE led flashing orange.
This is normal and indicates there is no speed signal arriving from the propeller (because the engine is stopped)!.
This will only occur while the engine is stopped. If you get this indication while the engine is running, it could indicate a possible fault condition and should be investigated.
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Propeller At Fine Pitch Stop
Once you start your engine you should see the FINE led flashing green.
This indicates controller is attempting to drive in the fine direction, but the propeller is already at the fine pitch stop.
You may see this indication many times when the throttle is only partially open. It shows the control system is working properly but that the current selection of speed and throttle do not allow for governing to the set speed.
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Constant Speed Governing
When you are flying, you may see an occasional flick of orange on either the FINE or COARSE leds. This is the normal operation of the propeller making very fine adjustments to the propeller pitch to keep the engine speed constant.
If there is a large change in throttle setting or aircraft attitude (or you have selected a different engine rpm), one or other of the indicators may stay on for longer.
If you are in very calm air, with no change in throttle, you may see no indications. This is normal.
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Fault Indications
Slip ring Brushes Worn Out
This is actually a general warning that there is an open circuit in the electrical system. The most likely reason for this is that the main slipring brushes are worn out.
If this occurs, check or replace the slipring brushes and clean the slipring.
If this does not cure the fault contact Airmaster for further advise.
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Propeller At Coarse Pitch Stop
During automatic operation, this indicates the controller is attempting to drive in the coarse direction, but the propeller is already at the coarse pitch stop.
This is most likely to occur if you are flying at a higher than normal altitude, at high power settings. It would be a clue that the coarse pitch stop is currently set too fine.
The coarse pitch stop is set at the factory to a nominal value, but it is expected that you will have to adjust this to your particular conditions. Please refer to the Operators Manual.
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Over current
A solid red indicator in any of the circuits of FINE, COARSE or FEATHER is an indication that the propeller is drawing too much current.
If this occurs in AUTO operation, constant speed regulation will be suspended. The indicator can be cleared by switching to MAN.
If you need make a pitch adjustment for safety reasons, you can attempt to do so in manual, but it is advised that you investigate the problem properly before further automatic operation is attempted.
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