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kenryan
Joined: 20 Oct 2009
Posts: 424
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 Posted: Wed Jan 20, 2016 1:23 pm Post subject: Rotax 914 Generator, Alternator, Starting and Fuel Pump Cont |
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I developed the attached wiring based on input from a Rotax dealer in British Columbia. It assumes that the optional external alternator (40 amp) is installed in addition to the integrated generator (20 amp). The integrated generator is used only to power the main fuel pump. The 914 requires an operational fuel pump to run. The ignition is independent. I would appreciate input on the attached diagram. Thanks.
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Thu Jan 21, 2016 8:12 pm Post subject: Re: Rotax 914 Generator, Alternator, Starting and Fuel Pump |
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In case of over voltage the 5 amp fuse will blow before the 5
amp breaker. Eliminate the fuse.
The note on the drawing says that the main bus can be separated
from the battery. If that means to shut off the master, I do
not know why anyone would want to do that.
I suggest adding a relay and lamp to indicate that the 20 amp
dynamo is not working. Red lamp should go out when
rectifier/regulator is working. See attached pdf.
When the momentary push button switch is first pressed, the 5
amp fuse will carry current to fuel pump #1 before the
rectifier/regulator puts out full voltage. That fuse could
blow if not rated to handle the fuel pump current.
Resize the rectifier/regulator fuse from 20 amps to whatever
the pump requires. 10 amps?
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Thu Jan 21, 2016 8:28 pm Post subject: Re: Rotax 914 Generator, Alternator, Starting and Fuel Pump |
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Actually the relay is not even needed. The lamp will illuminate per the
attached pdf if the voltage is not equal at the two points where the lamp
connects. The fuel pump will pass lamp current to ground.
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Rotax 914 Pump.pdf |
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