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yellowduckduo(at)gmail.co
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 Posted: Wed Jun 17, 2020 2:52 pm Post subject: Z101 with Rotax 915iS |
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Well on the 912is since gen A is rated at 16 amps and gen B at 30 amps
that's a big hint.
But then I read that having both fuel pumps on might trip off gen A
which just seems like poor design if true.
Don't know if this is the same on the 915.
Ken L.
On 17/06/2020 10:07 AM, Ken Ryan wrote:
| Quote: | If Gen A fails, the ECU will disconnect Gen B from the charging system
(battery) and connect it to essential engine loads. Rotax does not
want you to do it, but if you then close the Emergency Power switch,
Gen B will also be re-connected to the charging system. In this
condition, it would be possible to load the generator to the point
where voltage drops to a level where the essential engine equipment
fails. Because Rotax does not publish how much current the engine
requires, it is difficult to determine what is safely available for
running non-engine equipment.
On Wed, Jun 17, 2020 at 5:37 AM Matthew S. Whiting
<m.whiting(at)frontier.com <mailto:m.whiting(at)frontier.com>> wrote:
<m.whiting(at)frontier.com <mailto:m.whiting(at)frontier.com>>
I believe Joe is correct and this is the reason I desire an
external alternator. Even though the 915 has two alternators, it
effectively only has one from the perspective of ship’s power.
From page 3 of the Appendix to the Rotax 915iS installation manual.
“Engagement of the backup power supply system Generator B is done
by the Engine Control Unit (ECU) in the case of over voltage and
under voltage. If the voltage of power supply system Generator A
decreases signifi- cantly or at all, the control transition of the
power supplies is additionally done per mechanical means (relays
drop out). These mechanism allow engagement of backup power supply
under every probable circumstance.
If power supply system Generator B is used to supply the aircraft
electrical system (possible in common opera- tion mode) it must be
noted that in case of failure this power supply system B is
disconnected from the aircraft to serve as the backup to the EMS.“
> On Jun 17, 2020, at 5:15 AM, Ken Ryan <keninalaska(at)gmail.com
<mailto:keninalaska(at)gmail.com>> wrote:
>
>
> All accurate Joe. But I think there is a wrinkle. It is my
understanding that if Gen A fails, AND the Emergency Power Switch
is closed, THEN Gen B will operate both Engine and power the Bus.
At least that's my understanding.
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m.whiting(at)frontier.com
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| Posted: Thu Jun 18, 2020 3:37 am Post subject: Z101 with Rotax 915iS |
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What emergency power switch? I see no such reference in the 915iS installation manual. I looked at HIC A and B and X3 and I see no such switch terminals. X3-1 allows external power to be used in the event that both generator A and B fail together, but I see no emergency power switch.
| Quote: | On Jun 18, 2020, at 3:36 AM, Ken Ryan <keninalaska(at)gmail.com> wrote:
If Gen A fails, the ECU will disconnect Gen B from the charging system (battery) and connect it to essential engine loads. Rotax does not want you to do it, but if you then close the Emergency Power switch, Gen B will also be re-connected to the charging system. In this condition, it would be possible to load the generator to the point where voltage drops to a level where the essential engine equipment fails. Because Rotax does not publish how much current the engine requires, it is difficult to determine what is safely available for running non-engine equipment.
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kenryan
Joined: 20 Oct 2009
Posts: 424
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| Posted: Thu Jun 18, 2020 5:32 am Post subject: Z101 with Rotax 915iS |
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In the latest Installation Manual it is referred to as "Battery Backup
Switch."
On Thu, Jun 18, 2020 at 3:41 AM Matthew S. Whiting <m.whiting(at)frontier.com>
wrote:
[quote]
m.whiting(at)frontier.com>
What emergency power switch? I see no such reference in the 915iS
installation manual. I looked at HIC A and B and X3 and I see no such
switch terminals. X3-1 allows external power to be used in the event that
both generator A and B fail together, but I see no emergency power switch
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