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  #1  
Old 02-02-2021, 09:51 AM
riseric's Avatar
riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 456
Default Trim with SV-AP-PANEL vs VP-X sanity check

Hi, this is also posted on the Dynon Forum.
I thought to post here also to get a wider audiance and opinions.



Hi all, I'm almost finished wiring a RV-8.
Skyview HDX, pitch and roll servos, Ray Allen Pitch Trim.
Sanity check for me concerning Trim wiring.

Not having at that time received the Dynon Skyview goodies, I initially connected the Ray Allen Pitch Trim 5 wires and the trim switches to VP-X as per their instructions.
I now realise that I will need to re-wire the Trim motor and the Trim switches if I want to enjoy the Auto-Trim along with the Auto-Pilot through the SV-AP-PANEL.

If I understand correctly, it would be necessary to entirely un-plug the Trim motor and Trim switches from the VP-X, then connect to the SV-AP-PANEL D15:
the 2 white wires of the Trim motor to #7 & 8,
a 12V 4A (from VP-X) to #9,
a ground to #2,
the pilot's and copilot's Trim switches to #3-4-5-6 as per instructions?

Also the Pitch Trim motor's 2.5V, ground and position input to the EMS?

I believe I'm understanding this out correctly, but before I start to un-do stuff, I'd like to confirm with people that have the same set-up.
Thanks !!!
__________________
Eric,
2021 dues happily donated
RV-8 slow built #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ
Final inspection done!! Waiting for CofA
C-72R Cutlass, flying
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  #2  
Old 07-01-2021, 11:10 AM
N804RV's Avatar
N804RV N804RV is online now
 
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 805
Default

Quote:
Originally Posted by riseric View Post
Hi, this is also posted on the Dynon Forum.
I thought to post here also to get a wider audiance and opinions.



Hi all, I'm almost finished wiring a RV-8.
Skyview HDX, pitch and roll servos, Ray Allen Pitch Trim.
Sanity check for me concerning Trim wiring.

Not having at that time received the Dynon Skyview goodies, I initially connected the Ray Allen Pitch Trim 5 wires and the trim switches to VP-X as per their instructions.
I now realise that I will need to re-wire the Trim motor and the Trim switches if I want to enjoy the Auto-Trim along with the Auto-Pilot through the SV-AP-PANEL.

If I understand correctly, it would be necessary to entirely un-plug the Trim motor and Trim switches from the VP-X, then connect to the SV-AP-PANEL D15:
the 2 white wires of the Trim motor to #7 & 8,
a 12V 4A (from VP-X) to #9,
a ground to #2,
the pilot's and copilot's Trim switches to #3-4-5-6 as per instructions?

Also the Pitch Trim motor's 2.5V, ground and position input to the EMS?

I believe I'm understanding this out correctly, but before I start to un-do stuff, I'd like to confirm with people that have the same set-up.
Thanks !!!
Hey,

I'm curious. What did you ever find out about this? How did you wire your trim system? I'm in the same boat now.
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Mount Vernon, WA
2020 VAF Supporter
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  #3  
Old 10-13-2021, 12:56 AM
denbobp denbobp is offline
 
Join Date: Apr 2010
Location: California
Posts: 100
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I had my trim working until I removed from vpx to follow the Dynon guidance. Now nothing works. Still figuring through it.
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  #4  
Old 10-13-2021, 06:49 AM
riseric's Avatar
riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 456
Default Exactly as in post #1

Hi Ken,
I unplugged the trim wires from the VP-X and re-wired as per Dynon.
Just what I posted in the #1 post above.
All works well !!

Hope this helps
__________________
Eric,
2021 dues happily donated
RV-8 slow built #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ
Final inspection done!! Waiting for CofA
C-72R Cutlass, flying
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  #5  
Old 10-13-2021, 10:24 AM
david_rv8a david_rv8a is offline
 
Join Date: Apr 2011
Location: Madison, AL
Posts: 18
Default Check VP-x Trim Power

Quote:
Originally Posted by denbobp View Post
I had my trim working until I removed from vpx to follow the Dynon guidance. Now nothing works. Still figuring through it.
I had the same issue with nothing working after connecting the trim to the Dynon from the VP-x. Solution is to remove circuit fault monitoring on the VP-x circuit you use for the trim power to the Dynon AP panel D15 connector.
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  #6  
Old 10-13-2021, 10:47 AM
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scrollF4 scrollF4 is offline
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Location: Flower Mound, TX
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Quote:
Originally Posted by david_rv8a View Post
… Solution is to remove circuit fault monitoring on the VP-x circuit you use for the trim power to the Dynon AP panel D15 connector.
Please help me understand what protections you still have. Does that circuit still have normal over-amp CB protection?
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  #7  
Old 10-13-2021, 11:24 AM
david_rv8a david_rv8a is offline
 
Join Date: Apr 2011
Location: Madison, AL
Posts: 18
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Yes, I believe so. Even still, the trim power is very low amperage to the Ray Allen servos and according to the Vertical Power installation guide, low amperage devices do not need the current fault detection:

Current Fault: The pin can be configured to detect a “current fault” or open circuit. When a circuit with this feature enabled
is turned on and does not draw any current for 3 seconds, the circuit is faulted. You can use this to detect burned out lights, faulty boost pump, failed avionics fan, or inop heated pitot tube for example. The minimum detectable current is about 100ma, so this should be used on devices like lights, strobes and loads that draw at least 100ma of current.

Since the trim motors connected to the Skyview A/P they require an always on circuit, but if current fault detection is turned on for its power circuit, it will not allow current to flow after the 3 seconds since your trim button or hat switch is not activated.

I should note that for VP-x "switched" circuits, the current fault detection doesn't shut the circuit off after 3 seconds per the above. But for "always" on circuits like you would want for the trim power, the current fault detection operates per above.

Last edited by david_rv8a : 10-13-2021 at 11:37 AM.
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  #8  
Old 10-13-2021, 11:57 AM
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riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
Posts: 456
Default

I confirm what is said above.
Disable the current fault monitoring on the VP-X trim power pin.
VP-X will protect the circuit normally to the value you entered in its setup.
On my setup, the trim will function only when power is applied to the SV-AP-PANEL.
If only the displays are powered, the trim does not operate.
__________________
Eric,
2021 dues happily donated
RV-8 slow built #83274
Grove Airfoiled Gear, Wheels & Brakes
VPX-Pro, EFII System 32, EarthX batteries
Aerosport IO-375, MTV-9-B/183
Skyview HDX
C-GEMQ
Final inspection done!! Waiting for CofA
C-72R Cutlass, flying

Last edited by riseric : 10-13-2021 at 12:06 PM.
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