gordonrsmith921(at)yahoo.
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 Posted: Mon Jul 13, 2009 2:05 pm Post subject: Z-19 Future Plans for use with Eggenfellner Engine |
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Considering that AEC 9005-101 is no more and that AEC 9011-100-1 and AEC 9004-1 will be available in the future.
I really like the capability of what the 9011 will do for not only control and enunciation of OV but also the monitoring of LV for 2 electrical busses. (A side note – the REV B 02-04-06 drawing for the 9011 device shows a redundant #6 connection).
If the internally regulated alternator used with this system is like the Plane Power and the Enable/Field connection carries the field current (as indicated in ‘Lectric Bob’s correspondence with plane power), I assume the following: - AEC9004 is not needed with the AEC 9011.
- The Special Disconnect Relay will break the field connection, which would be powered to the relay from the 5A.CB and back to the ALT On Switch.
- The N.O. terminal on the Disconnect Relay, could be connected to ground. This would open the 5A.CB when the relay was activated. This is redundant, I am sure. But can it hurt? Does tripping of the 5A.CB at the time of every pre-flight test/reset series cause a problem?
If the internally regulated alternator is not as above and the field current cannot be broken; I assume that this is where AEC 9004 is needed. How is this integrated into the above?
Two other related questions: - I understand that Jan Eggenfellner recommends that both main batteries should be used in parallel during an engine start. Is there any reason that a “Brown-Out” addition should not be considered as was done in converting Z-13/8 to Z-10/8? It only adds cost/weight of one more small battery and one more small relay. A side benefit is that this would add somewhat to the alternator out flight duration.
- In looking at Eggenfellner’s most current recommendation for the electrical power system to be used with his engines, I would like to consider the following: Instead of one 4PDT switch to the engine, it makes sense to me to have 2 4PST switches through a double power diode to each of the 4 essential engine items (the 4th for me would be the propeller). Eliminate the “Ignition Switch”. This to me reduces parts count and eliminates a single point of failure (double throw switch). Comments?
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