rampil
Joined: 04 May 2007
Posts: 870
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 Posted: Thu Dec 10, 2015 6:55 am Post subject: Revisiting Ground Power Adapter: Modern Chargers |
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Greetings All!
I recently updated my Europa/Rotax to move my batteries to the back
of the airframe from the firewall. Since the batteries are now inaccessible,
I decided to install a formal charging port on the fuselage.
Starting with Bob's original design, I used the circuit design, changing
only the receptacle to an Anderson Power Products 175 AH (I just couldn't
justify the weight of the antique, massive Piper receptacle).
The System works well when connected to an external 12V truck battery,
or when connected to an old fashioned (20-30 year old) aircraft shop charger.
However, when driving the airframe battery with a modern, computer-
controlled charger, the charge port contactor relay chatters (oscillates
open-closed) at 3-5 Hz. If I modify the Nuckoll's circuit to remove the
kickback diode on the contactor (1N4001), the chatter stops and circuit
performs as expected. I have yet to put a scope on the circuit, but the
12 Henries of reactance I estimated on the White-Rogers Type 71 coil
seems to interact badly with the voltage sensing feature of "Smart" chargers.
Any Thoughts?
Ira
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Ira N224XS |
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