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Thread: Safety trim wiring in parallel

  1. #1
    Senior Member Esser's Avatar
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    Default Safety trim wiring in parallel

    Why does the safety trim kit have two wires for everything? Going to the Servo motor I have 2 20awg wires supposed to hook up to a single 22 awg wire. Is there an advantage for this? What is the best way to butt slice two larger wires to one small?

    Also, the kitfox wiring schematic has two 14awg wires from the alternator. Does it need it for load reasons and if so why not use a larger wire? Is it for redundancy? Is it really necessary?
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  2. #2
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    Default Re: Safety trim wiring in parallel

    Makes no sense ... I've doubled up wiring when I needed a larger size, but
    it doesn't really make sense to kit something like that. On the other hand
    there's no harm in it it either ...

    Jeff

  3. #3
    Senior Member jiott's Avatar
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    Default Re: Safety trim wiring in parallel

    Maybe I don't understand what you mean by "safety trim", but the pitch trim servo motor has 2 wires. The long wiring cable that comes in the kit also has 2 wires. Hook the two wires in the cable to the two wires from the motor. One will be power and the other ground, then vice-versa when you switch to reverse. This is too simple so I am sure I don't understand your question.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  4. #4
    Senior Member Esser's Avatar
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    Default Re: Safety trim wiring in parallel

    This is for the brand “safety trim”. It’s a controller that slows down the speed of the trim motor in faster flight. It also has runway protection etc. It’s wiring diagrams have a lot of the wires wired in parallel. So you would have two wires attach to the red and two to the black on the motor. And I’m not sure with a 18-22 butt splice if I can put two 20 gauge wires in One end.
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  5. #5
    Administrator DesertFox4's Avatar
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    Default Re: Safety trim wiring in parallel

    TCW Technologies, one of our great site sponsors, makes this safety device.
    Learn more about it here:
    http://www.tcwtech.com/safety_trim.html#features


    DesertFox4
    Admin.
    7 Super Sport
    912 ULS Tri-gear


  6. #6
    Senior Member jiott's Avatar
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    Default Re: Safety trim wiring in parallel

    OK, now I see what you are talking about.
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  7. #7
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    Default Re: Safety trim wiring in parallel

    Josh, What model trim contoller do you have? Sounds like you might have a dual axis controller and harness for single axis use. Should have 10 wires for single axis and 14 for dual axis - none doubled up.

    On current single axis models - #3 (yellow) should go to red (+) on the servo and #4 (also yellow) should go to black (-) on the servo.

    Greg

  8. #8
    Senior Member Esser's Avatar
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    Default Re: Safety trim wiring in parallel

    It is single axis model ST-1-12v-2sp-HD

    Here are pictures of my install instructions from TCW and kiyfox. Note pins 4,12 3,11 7,15 1,9

    I just noticed that there is s note that says these parallel connections are for servos rated for more than 5 Amps. So why is the Servo itself a 22awg wire?
    Attached Images Attached Images
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  9. #9
    Senior Member Esser's Avatar
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    Default Re: Safety trim wiring in parallel

    I don’t know why my pictures are posting so small. Hope you can still see
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  10. #10
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    Default Re: Safety trim wiring in parallel

    Your servo is likely rated for way less than 5 amps, hence 22 ga wire. If so this is the wiring diagram currently being used:

    http://www.tcwtech.com/Installation%...20st-1-12v.pdf

    Greg

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