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spcialeffects
Joined: 29 Aug 2012
Posts: 306
Location: Kent
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 Posted: Thu Sep 08, 2016 11:26 am Post subject: Isolating the Rotax alternator |
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Hi all. I am building a europa with a rotax 914 engine. I am having quite a few electrical goodies and for this reason i am having/need 2 alternators which will run together, the rotax alternator will run an essential bus bar and the auxiliary b&c 420 alternator will run a load shed bus bar. Also the batteries (2) I'm having are the Li-5 Red Top Lithium Phosphate. As part of the LAA here in the UK the modification to use these batteries requires a means of isolating both batteries AND both alternators.
I'm using Mr Knuckles mother of all electrical systems as my main platform. In the cockpit I'm using 2 cessna duel rocker switches, 1 for each system and a carlin toggle switch for the cross over feed. Now the auxiliary alternator i can isolate using the field wire but the rotax alternator doesn't have one. I spoke to my rotax engineer and he said i could interrupt one of the ac yellow wires, before it goes to the regulator, which by the way is a Schicke GR6, and put a 40amp relay in which i can switch on and off. I would just like to confirm with those of you much more capable than me, if this is correct.
This side of my build, electrics, is by far the most challenging discipline i have tried to understand.
Many thanks Frank
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nuckolls.bob(at)aeroelect
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| Posted: Thu Sep 08, 2016 4:16 pm Post subject: Isolating the Rotax alternator |
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At 02:26 PM 9/8/2016, you wrote:
| Quote: | --> AeroElectric-List message posted by: "spcialeffects" <spcialeffects(at)aol.com>
Hi all. I am building a europa with a rotax 914 engine. I am having quite a few electrical goodies and for this reason i am having/need 2 alternators which will run together, the rotax alternator will run an essential bus bar and the auxiliary b&c 420 alternator will run a load shed bus bar. Also the batteries (2) I'm having are the Li-5 Red Top Lithium Phosphate. As part of the LAA here in the UK the modification to use these batteries requires a means of isolating both batteries AND both alternators.
I'm using Mr Knuckles mother of all electrical systems as my main platform. In the cockpit I'm using 2 cessna duel rocker switches, 1 for each system and a carlin toggle switch for the cross over feed. Now the auxiliary alternator i can isolate using the field wire but the rotax alternator doesn't have one. I spoke to my rotax engineer and he said i could interrupt one of the ac yellow wires, before it goes to the regulator, which by the way is a Schicke GR6, and put a 40amp relay in which i can switch on and off. I would just like to confirm with those of you much more capable than me, if this is correct. |
That would be my recommendation
| Quote: | This side of my build, electrics, is by far the most challenging discipline i have tried to understand.
Many thanks Frank |
You're most welcome.
Bob . . .
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