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Ray Allen Trim Servos and Garmin GAD 27

 
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mikeeasley(at)aol.com
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PostPosted: Sun Nov 05, 2017 5:38 am    Post subject: Ray Allen Trim Servos and Garmin GAD 27 Reply with quote

I have 4-way hat switches on my sticks. I’ve used both the RAC REL-2 Relay Decks and later switched to a SafetyTrim for the elevator trim.

For reference…

Description of Relay Deck…
This device converts the momentary contact action of the ROS-4 4-way switch, or any SPST pushbutton switch, into a DPDT action that is necessary to operate Ray Allen servos.
Description of RAC Switch…
The RS2 rocker switch is designed to electrically short the actuator motor to ground (-) when released. This stops the actuator motor without any coasting, allowing precise positioning of the actuator.

The GAD 27, part of my G3X panel, is supposed to be a trim controller. I does the mixing, variable speed control, etc., but I can’t find any reference to it working correctly with the RAC servos. So do I need relay decks, or not? If so, where? Between the switches and the GAD 27, between the GAD 27 and the autopilot servos, or between the autopilot servos and the trim servos?

Thanks,

Mike


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gilles.thesee(at)free.fr
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PostPosted: Sun Nov 05, 2017 6:26 am    Post subject: Ray Allen Trim Servos and Garmin GAD 27 Reply with quote

Le 05/11/2017 à 14:35, Michael Easley a écrit :

Quote:
<![endif]--> <![endif]-->

The GAD 27, part of my G3X panel, is supposed to be a trim controller.  I does the mixing, variable speed control, etc., but I can’t find any reference to it working correctly with the RAC servos.  So do I need relay decks, or not?  If so, where?  Between the switches and the GAD 27, between the GAD 27 and the autopilot servos, or between the autopilot servos and the trim servos?
 
Mike and all,

FWIW, the Garmin G3X Install Manual v 5 states 5A current output for each of the trim motors, see page 23.3.
Pages 24.9 through 27.11 show example wirings with direct stick switch arrangement and no relay.
Also the RAC trim installation sheet shows a 1 A fuse or breaker.

So I think you should be OK with no relays. Of course once the system is installed, a precautionary current measurement is in order.
What you didn't mention is whether you are using GSA28 A/P servos or not ?

Hope this helps,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr


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nuckolls.bob(at)aeroelect
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PostPosted: Sun Nov 05, 2017 8:54 am    Post subject: Ray Allen Trim Servos and Garmin GAD 27 Reply with quote

Quote:

So I think you should be OK with no relays. Of course once the system is installed, a precautionary current measurement is in order.
What you didn't mention is whether you are using GSA28 A/P servos or not ?

The RAC actuators draw very low currents. I've seen
them powered with an array of AA alkaline cells with
YEARS of service. I think they draw about 100 mA.


Bob . . .


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kuffel(at)cyberport.net
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PostPosted: Mon Nov 06, 2017 6:20 am    Post subject: Ray Allen Trim Servos and Garmin GAD 27 Reply with quote

<< RAC actuators ... I think they draw about 100 mA. >>

What I measured, with a large scale ammeter, was under 200 mA (first mark) so "about 100 mA" sounds correct.

Tom Kuffel

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