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Subject: Re: [LML] strobe light power draw
From: Colyn Case <colyncase@earthlink.net>
In-Reply-To: <list-6068743@logan.com>
Date: Sun, 17 Feb 2013 18:03:19 -0500
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References: <list-6068743@logan.com>
To: "Lancair Mailing List" <lml@lancaironline.net>

Charley,

I haven't examined the Whelen strobe controller but it wouldn't surprise =
me if it had more draw right after the flash.  =20

What is the setup between alt 1 and alt 2?   Do you have them both =
feeding the same bus?  If so, maybe increasing the spread (e.g. make alt =
2 .2 V lower than alt 1) will keep #2 from cycling on and off all the =
time.    (I have a 2 bus system and run some items off of alt 2 and =
others off of alt 1 with critical systems fed by both through diodes.   =
The diodes mean I have a soft failover if alt 1 fails but the spread =
means that alt 1 carries the load normally for those items that are fed =
from both sides.   The separate busses mean I find out as soon as it =
happens if alt 2 is weak...and then I can go to cross feed).

Colyn

On Feb 17, 2013, at 2:16 PM, Charles Brown wrote:

Amigos,=20

My 24V strobe light systems draws 3-4 amps like Whelen says it should, =
but seems to do it cyclically, i.e., a 0-4 amp sine wave with period =
equal to the flash rate (about 3 sec).  Can anyone tell me if that is =
normal, or should it be a steady 3-4 amp draw?  (12V guys, same question =
only 12V Whelen strobes should pull around 7 amps)

< I ask because it's making prime alternator amps cycle up and down; bus =
voltage cycle up and down, only about 0.1V; but it may be related to the =
demise of two successive regulators for the backup alternator, which =
starts kicking in at 3-sec intervals, with loud "BONG" alerts from the =
Garmin.  You are invited to enjoy the mental spectacle of the Garmin =
BONGING me into insanity while I hurl epithets at the instrument panel =
as I alternately shut off ALT 1, then ALT 2, then both, trying to figure =
this out when I SHOULD be sitting back, smoking a stogie, and watching =
the Texas hill country scenery slide by. PS -- Alternator one regulator =
checks out good with good ground and power paths etc >

Charley
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