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Ok, here is the schematic I promised. Please be aware that I'm including a bunch of circuit notes below to accompany it. When I make it available on the LML website I'll incorporate a page with them right into the PDF.
1. This circuit makes a lot of assumptions, I'll try to deal with them in these notes. Please be advised that the usual disclaimers apply and that use of this material is at your own risk. There are no guarantees either expressed or implied regarding its suitability for any particular application. Yada yada yada, you know.
2. The trim motor shown operates on DC and is reversible by switching the polarity of its 2 power leads.
3. There are no limit switches shown in this circuit that would automatically cut power to the trim motor when it reaches its travel limits. It is assumed that those limits are included in the trim actuator housing.
4. The "A/P Engage Relay" shown is a DPDT relay. It may be replaced with a DPST relay as the NC contacts aren't used in that part of the circuit.
5. There are no MOVs or flyback diodes shown mounted across the relay coils. Their use is highly recommended to minimize arcing across any switch contacts that control the relay coils.
6. Every A/P system is different so be sure that this circuit corresponds to the operating requirements of your particular A/P. See circuit note #1 above.
7. Most A/Ps utilize an A/P disconnect switch, some of which may serve double duty (like on the TruTrak... blip the A/P disconnect to disengage the A/P... press and hold it and it actuates control wheel steering.) This circuit may or may not work with that system... again, see note #1.
8. This circuit is designed to disengage an A/P that uses a single signal wire to keep it online. A quick blip of the pitch trim in either direction will be the same as pushing an A/P disconnect.
9. SInce I have no way of knowing whether your A/P requires a positive voltage or a ground to keep it engaged, the connection to the common terminal #1 of the "A/P Engage Relay" is labelled to provide the signal "as req'd"... check your A/P schematics carefully to insure it's hooked up correctly.
10. Lines that simply cross each other in the schematic are not connected... there are dots that show connections.
Well, that's about it. If you've got any questions just fire away. I'm always glad to help out.
<Marv>
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