nuckolls.bob(at)aeroelect
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 Posted: Wed May 27, 2009 8:29 am Post subject: SEC-1223 Power Supply |
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At 09:18 AM 5/27/2009, you wrote:
Bob,
On reading a recent thread on Aerolectrics, I ordered the SEC-1223
Power Supply from Universal Radio to power my avionics on the ground
with direct connection to my aircraft battery as a battery backup.
Question: The supplied manual gives a warning: "These units are
power supplies and not battery chargers. Do not connect these units
directly to a battery. Battery charging and battery charging may be
undertaken only when the battery is connected through suitable
external isolating diodes and charge limiting resistor. The
isolating diode will ensure that the battery does not back power the
power supply.. When the battery is deeply discharged, it will
initially draw a very large charging current and thus, will force the
power supply into current limit mode for prolonged periods. This is
harmful for the power supply. The charge limiting resistor will
limit the charging current, thereby, ensuring that the maximum
charging current is well below the current limit value of the power
supply. It is recommended that optional battery backup module
BBM-1225 may be used to convert SEC-1223 for battery backup application."
Looks simple enough to make my own module? Could you recommend a
circuit with diagram and give your two cents regarding the warning?
Yes. I have a drawing in the pile of things
to do that shows how to convert the SEC-1223 (or
a similar power supply) to an "alternator
emulator". The warnings from Samlex about using
the stand-alone power supply as a battery charger
are well taken. Any time I've used these supplies
to power up the airplane in the shop, the power
supply was used as a battery emulator.
I'll see if I can dig out those drawings and
publish them along with the explanatory text.
In the mean time, just use the power supply to
energize the system (tied to the alternator
b-lead?) but leaving the battery master switch
OFF.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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