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1. 03:33 PM - Slowing down the ABMM (Gilles Thesee)
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| Subject: | Slowing down the ABMM |
--> AeroElectric-List message posted by: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
Hi Bob and all,
Our Rotax 914 powered MCR 4S is wired per fig Z16 with dual battery and
ABMM.
To date we have logged 17 happy flight hours and we are waiting for the
Civil Aviation Aythority to send back the registration papers.
When fast idling, when the regulator is just below nominal voltage, the
votage must be rapidly varying around 13 V, and the ABMM connects and
disconnects the Aux Battery contactor at a very fast rate. The rattle of
the contactor closing and opening at 4-5 Hz is a bit of a concern.
Here is my question :
How could I slow down the action of the ABMM ? Once every two seconds
would seem far safer.
I imagine I could try to install a capacitor between ground and the
sense wire. Or could a device introduce some hysteresys into the ABMM
action ?
As the airplane is presently flying, I'd prefer to just add one or two
components, rather than rewire the whole circuit.
Any input appreciated.
Thanks in advance,
Regards,
Gilles Thesee
Grenoble, France
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