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bferrell(at)123mail.net
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 Posted: Fri Oct 12, 2007 3:48 am Post subject: Strange breaker issues |
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Bob/all,
I have a strange issue with my newly flying homebuilt Velocity. My nav
light breaker keeps tripping, but only when the engine is running. If I
turn on the nav lights (red/green/two rear-facing whites of a Whelen
wingtip kit, supposed to pull 2A - it's not clear if that's a piece or
together, are on a 5A Klixon breaker), without the engine running they
will stay lighted for long periods of time without issue (easily over a
half hour during testing, even with the strobes and other loads on, or
without other loads). However, when I turn them on with the engine
running, the breaker trips within 5 minutes typically.
My first thought was to remove one load at a time to see if one of my
molex connectors had a partial short, or if they were just pulling too
much load together, so I started this test in the hangar and found it
wouldn't trip in the hangar.
Other, probably not relevant data:
1) all uses have dedicated direct ground wires due to composite construction
2) grounds are routed on a common ground bus on 1 ground that runs from
the engine at back to a forest of tabs at the rear firewall, and a set
of tabs on the canard, to the battery
3) set up as dual-alternator, single battery system
4) engine uses electronic ignition
5) the (rear-mounted) alternators use current limiters on the firewall,
not breakers in the panel
Brett
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matronics(at)rtist.nl
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| Posted: Fri Oct 12, 2007 4:19 am Post subject: Strange breaker issues |
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If these Whelen strobe/nav lights are like mine they draw close to 7A. Maybe
they draw 5A when running on 12V battery power, and it goes up a bit to 7A
when you start the engine and your ships power goes to 14V.
Rob
---
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bferrell(at)123mail.net
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| Posted: Fri Oct 12, 2007 4:41 am Post subject: Strange breaker issues |
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I've got the stobes switched and 'breakered' separately with a 7A Klixon. The
wingtip position/nav (A600 PG/PR) lights, which are clearly shown as 4 amps at
14V on page 24 of thier documentation, but here I see the wattage (26 and 24,
respectively) for the first time, and so it does appear that is the "total
power consumption" for one Lamp Assembly (forward and aft) but not the pair....
Oops.
http://www.whelen.com/pb/Aviation/Anti-Collision_Light_Systems_Installation_and_Service_Manual.pdf
Brett
Quoting Rob Turk <matronics(at)rtist.nl>:
[quote]
If these Whelen strobe/nav lights are like mine they draw close to 7A. Maybe
they draw 5A when running on 12V battery power, and it goes up a bit to 7A
when you start the engine and your ships power goes to 14V.
Rob
---
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mprather(at)spro.net
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| Posted: Fri Oct 12, 2007 4:51 am Post subject: Strange breaker issues |
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2A sounds low for nav lights. Is this a 12/14V system, or 24/28V? Are
these LED lights or conventional incandescent bulbs? If conventional
bulbs, I think you can count on at least 5A for the system. When the
engine is running the bus voltage comes up, and since lights aren't
constant power devices, they will draw more current - popping the breaker.
At least that's my theory...
Regards,
Matt-
| Quote: |
<bferrell(at)123mail.net>
Bob/all,
I have a strange issue with my newly flying homebuilt Velocity. My nav
light breaker keeps tripping, but only when the engine is running. If I
turn on the nav lights (red/green/two rear-facing whites of a Whelen
wingtip kit, supposed to pull 2A - it's not clear if that's a piece or
together, are on a 5A Klixon breaker), without the engine running they
will stay lighted for long periods of time without issue (easily over a
half hour during testing, even with the strobes and other loads on, or
without other loads). However, when I turn them on with the engine
running, the breaker trips within 5 minutes typically.
My first thought was to remove one load at a time to see if one of my
molex connectors had a partial short, or if they were just pulling too
much load together, so I started this test in the hangar and found it
wouldn't trip in the hangar.
Other, probably not relevant data:
1) all uses have dedicated direct ground wires due to composite
construction
2) grounds are routed on a common ground bus on 1 ground that runs from
the engine at back to a forest of tabs at the rear firewall, and a set
of tabs on the canard, to the battery
3) set up as dual-alternator, single battery system
4) engine uses electronic ignition
5) the (rear-mounted) alternators use current limiters on the firewall,
not breakers in the panel
Brett
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nuckolls.bob(at)cox.net
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| Posted: Fri Oct 12, 2007 5:02 am Post subject: Strange breaker issues |
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At 06:46 AM 10/12/2007 -0500, you wrote:
| Quote: |
Bob/all,
I have a strange issue with my newly flying homebuilt Velocity. My nav
light breaker keeps tripping, but only when the engine is running. If I
turn on the nav lights (red/green/two rear-facing whites of a Whelen
wingtip kit, supposed to pull 2A - it's not clear if that's a piece or
together, are on a 5A Klixon breaker), without the engine running they
will stay lighted for long periods of time without issue (easily over a
half hour during testing, even with the strobes and other loads on, or
without other loads). However, when I turn them on with the engine
running, the breaker trips within 5 minutes typically.
My first thought was to remove one load at a time to see if one of my
molex connectors had a partial short, or if they were just pulling too
much load together, so I started this test in the hangar and found it
wouldn't trip in the hangar.
Other, probably not relevant data:
1) all uses have dedicated direct ground wires due to composite construction
2) grounds are routed on a common ground bus on 1 ground that runs from
the engine at back to a forest of tabs at the rear firewall, and a set of
tabs on the canard, to the battery
3) set up as dual-alternator, single battery system
4) engine uses electronic ignition
5) the (rear-mounted) alternators use current limiters on the firewall,
not breakers in the panel
|
Nav lamps are typically 2A PER BULB. Your total
draw on this system could be as much as 8A with
the alternator on line. Get your meter out and
measure it.
Bob . . .
----------------------------------------
( "Problems are the price of progress. )
( Don't bring me anything but trouble. )
( Good news weakens me." )
( -Charles F. Kettering- )
----------------------------------------
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pwmac(at)sisna.com
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| Posted: Fri Oct 12, 2007 6:18 am Post subject: Strange breaker issues |
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I measured a pair cold and it is close to 7A measured at the bulb end
ignoring the wiring. Suggest you use a 10a CB and be sure the wire
can deal with the amps.
Paul
============
At 06:40 AM 10/12/2007, you wrote:
[quote]
I've got the stobes switched and 'breakered' separately with a 7A Klixon. The
wingtip position/nav (A600 PG/PR) lights, which are clearly shown as 4 amps at
14V on page 24 of thier documentation, but here I see the wattage (26 and 24,
respectively) for the first time, and so it does appear that is the "total
power consumption" for one Lamp Assembly (forward and aft) but not
the pair....
Oops.
http://www.whelen.com/pb/Aviation/Anti-Collision_Light_Systems_Installation_and_Service_Manual.pdf
Brett
Quoting Rob Turk <matronics(at)rtist.nl>:
>
>
> If these Whelen strobe/nav lights are like mine they draw close
to 7A. Maybe
> they draw 5A when running on 12V battery power, and it goes up a bit to 7A
> when you start the engine and your ships power goes to 14V.
>
> Rob
>
> ---
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emrath(at)comcast.net
Guest
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| Posted: Sun Oct 14, 2007 6:30 am Post subject: Strange breaker issues |
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Brett:
On page 18 of this document, it shows 2amps at 14V. That is just for the one
position light. On page 24 it says up ot 4amps TOTAL, which I would take to
include both the colored and the white position lights. So as Bob says,
using this model the Nav lights draw 4amps each side, two bulbs per side or
8amps total. Thus it depends upon which model position/strobe light you use
how the wire will be sized and fused. Hope this helps
Marty in Brentwood TN
RV-6A wiring (man there's a lot of wire).
I've got the stobes switched and 'breakered' separately with a 7A
Klixon. The
wingtip position/nav (A600 PG/PR) lights, which are clearly shown as 4
amps at
14V on page 24 of thier documentation, but here I see the wattage (26
and 24,
respectively) for the first time, and so it does appear that is the
"total
power consumption" for one Lamp Assembly (forward and aft) but not the
pair....
Oops.
http://www.whelen.com/pb/Aviation/Anti-Collision_Light_Systems_Installation_
and_Service_Manual.pdf
Brett
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