DII + AutoTrim

[kbehrent]

Just want to make sure I understand the wiring diagram correctly. The AP Master SWT will connect to Pin 13 on the AutoTrim, Pin 1 on the Roll servo, and Pin 6 on the D11. This will essentially kill the power to the DII, Autotrim, and the trim servo. Any reason I couldn't also include the aileron trim in this as well so the AP Master switch would kill both the A/P and trim system?

[TrutrakTech]

Just want to make sure I understand the wiring diagram correctly. The AP Master SWT will connect to Pin 13 on the AutoTrim, Pin 1 on the Roll servo, and Pin 6 on the D11. This will essentially kill the power to the DII, Autotrim, and the trim servo. Any reason I couldn't also include the aileron trim in this as well so the AP Master switch would kill both the A/P and trim system?

Let me just make sure I'm on the same page as you are. You are correct, the AP master will connect to either pin 12 or pin 13 on the autotrim, pin 1 on the roll servo, and pin 6 on the DII. However, you don't have to flip the master to regain trim control. Whenever the AP is disengaged, the autotrim will also be disengaged. It uses the pitch servo torque signal voltage as an engage signal.

Having the autotrim disengaged will not cut power to your trim servo. It will simply pass through as normal. Do you have an autotrim module on your ailerons as well?

[kbehrent]

Lucas,

I was assuming that the A/P Master switch depicted in the drawings was used to power up the DII and Autotrim. I assumed that having the pitch trim servo
routed through the AutoTrim module would essential kill power to it as well.

I was considering connecting the aileron trim power to the A/P master switch so that switching off the A/P would also turn off the both trim servos in case of a runaway trim condition or a runaway A/P.

No, there is no "autotrim" connected to the aileron trim.

[TrutrakTech]

Lucas,

I was assuming that the A/P Master switch depicted in the drawings was used to power up the DII and Autotrim. I assumed that having the pitch trim servo
routed through the AutoTrim module would essential kill power to it as well.

I was considering connecting the aileron trim power to the A/P master switch so that switching off the A/P would also turn off the both trim servos in case of a runaway trim condition or a runaway A/P.

No, there is no "autotrim" connected to the aileron trim.

We may have a case of a misnomer here. By saying "pitch trim servo", I assume you are speaking about the little servo that runs your trim tab. Not pitch servo of the autopilot that controls the elevator. The same with the ailerons, "trim servo" to me means you are speaking of the servo that controls the trim tab. Our servos operate the actual control surfaces.

Our diagram shows each servo connected to the AP master as well as the controller. When you add the autotrim into the system, you are simply placing it between the AP master and the pitch servo. Everything still operates in the same manner. If you flip the AP master, the power to the autotrim (and pitch servo), roll servo, and AP controller will be cut.

[kbehrent]

If you flip the AP master, the power to the autotrim (and pitch servo), roll servo, and AP controller will be cut.

Sorry for the confusion regarding wording, but we I refer to trim servo, I meant RC Allen Trim motor.

I agree with what you said above except I would also add that according to your diagram, if A/P Master Switch is turned off, it would also cut power to the "RC Allen Trim motor" as well. I say this because pin 10 & 9 of the AutoTrim motor appears to supply power to the RC Allen Trim motor depending on direction of travel. Is this not correct? If this is correct, I could use the A/P Master switch as a means to kill power to the RC Allen Trim motor in case of a runaway condition, whether the A/P was engaged or not. I could also wire the power to my RC Allen Aileron trim motor as well so this A/P Master switch would kill power to that as well.

Sorry for the confusion, but I saw an opportunity to use a single switch to power on/off my A/P & RC Allen Trim system in case on failure and thought it would be better than to have separate switches. Hopefully you'll understand what I'm talking about.

[TrutrakTech]

Sorry for the confusion regarding wording, but we I refer to trim servo, I meant RC Allen Trim motor.

I agree with what you said above except I would also add that according to your diagram, if A/P Master Switch is turned off, it would also cut power to the "RC Allen Trim motor" as well. I say this because pin 10 & 9 of the AutoTrim motor appears to supply power to the RC Allen Trim motor depending on direction of travel. Is this not correct? If this is correct, I could use the A/P Master switch as a means to kill power to the RC Allen Trim motor in case of a runaway condition, whether the A/P was engaged or not. I could also wire the power to my RC Allen Aileron trim motor as well so this A/P Master switch would kill power to that as well.

Sorry for the confusion, but I saw an opportunity to use a single switch to power on/off my A/P & RC Allen Trim system in case on failure and thought it would be better than to have separate switches. Hopefully you'll understand what I'm talking about.

Ok Kevin, we're on the same page now. Actually, when the AP master is off, your trim system acts as if there is no autotrim module there. The same goes for when the AP is simply disengaged. There is an internal relay system that "reconnects" those two wires you cut that go to your trim motor.

So, if you want a separate way to kill the power to the trim motor, you'll need another switch setup as the autotrim will not cut the power when it is disengaged. I hope this helps!

[kbehrent]

Lucas,

Ok, I understand now. Thanks for be patient.