Today's Message Index:
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1. 10:46 AM - regulators (dashwood)
2. 03:07 PM - Re: regulators (Richard Girard)
3. 06:15 PM - Re: regulators (dashwood)
Message 1
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i have a 701 /912 with a ducati reg on it. got a low voltage warning last time
out. checked resistance of two leads coming from engine coils shows 7.2 ohms.
@ rotax manuel. the 12v dc side of the reg has a red wire out of firewall to first
/ next contact on reg. labeled alternator switch. the next contact is jump
wired to first and 4th contact. 4th also has wire to 12000mfd capacitor and
from there to solid ground. checked fuse panel and found a blown 15amp fuse on
a wire labeled alternator. what was the builder trying to do with this fuse.
i have been told by others if you shut off alternator loads while engine is running
it will fry the reg. i have two switches on panel labeled master and alternator
and was told always on shutdown one first then the other , never in
the opposite order with threat of dire consequences. could this fuse be an over
voltage / draw protection for the rest of the buss or has it somehow protected
the reg from me fumbling with the panel switches. i have changed the fuse
but not been able to test run engine and see if this fuse holds, due to howling
blizzard here. hanger-ed but open into the wind today .
--------
Ross Aalexander: CH701 driver 912ul 450tt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=330780#330780
Message 2
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Ross, Suggest you review Section 17, pages 107-111 of the Rotax 912
Installation Manual.
Rick Girard
On Sat, Feb 12, 2011 at 12:43 PM, dashwood <dashwoodlock@hotmail.com> wrote:
> dashwoodlock@hotmail.com>
>
> i have a 701 /912 with a ducati reg on it. got a low voltage warning last
> time out. checked resistance of two leads coming from engine coils shows 7.2
> ohms. @ rotax manuel. the 12v dc side of the reg has a red wire out of
> firewall to first / next contact on reg. labeled alternator switch. the next
> contact is jump wired to first and 4th contact. 4th also has wire to
> 12000mfd capacitor and from there to solid ground. checked fuse panel and
> found a blown 15amp fuse on a wire labeled alternator. what was the builder
> trying to do with this fuse. i have been told by others if you shut off
> alternator loads while engine is running it will fry the reg. i have two
> switches on panel labeled master and alternator and was told always on
> shutdown one first then the other , never in the opposite order with threat
> of dire consequences. could this fuse be an over voltage / draw protection
> for the rest of the buss or has it somehow protected the reg from me
> fumbling with the panel switches!
> . i have changed the fuse but not been able to test run engine and see if
> this fuse holds, due to howling blizzard here. hanger-ed but open into the
> wind today .
>
> --------
> Ross Aalexander: CH701 driver 912ul 450tt
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=330780#330780
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 3
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thanks. i was not able to find the pages i needed before. i think the fuse i have
blown is the 25A after the reg terminals. the capacitor is in place and should
have protected the reg as/per manual. when you close 16(master) then 19
relay pulls on the battery supply to fuse bus. i have an endurance fuse bus as
well. somehow an alternator disconnect that draws minimal power only from battery
to supply minimal flight requirements. i assume to guard against over voltage
(failed reg). i don't see this in the diagram. not sure if master has to
be shut off first to stop feedback( blowing the 25A fuse). i just want to understand
what is happening so i can fix or not have happen in flight again.
--------
Ross Aalexander: CH701 driver 912ul 450tt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=330827#330827
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