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1. 12:17 PM - Re: Starter fuse blew x3 (Robert L. Nuckolls, III)
2. 08:06 PM - Re: Starter fuse blew x3 (David Saylor)
Message 1
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| Subject: | Re: Starter fuse blew x3 |
At 12:56 PM 1/22/2022, you wrote:
>Thanks Ken.=C2 Do you mean the contacts in the
>solenoid attached to the starter?=C2 I've
>replaced the starter in the past but never
>serviced the contacts.=C2 I can do that.
>
>The fuse that's blowing isn't in that circuit
>though.=C2 I should clarify my terms.=C2 The fuse
>that's blowing powers the starter contactor.=C2 I
>called it the starter solenoid.=C2 The starter
>contactor coil has dedicated external terminals
>for the coil and isn't associated with the high
>current starter or solenoid wiring.=C2 Cleaning
>up the solenoid contacts is doable but I think
>my terminology muddied the waters.=C2 Or do you
>think starting current is getting pulled through the starter relay coil?
>
The SlickStart device is basically a capacitor discharge
ignition system with a special feature, instead of delivering
one really hot spark per timing event, it delivers a series
of sparks for each timing event. You can get a peek inside
this critter by reviewing a patent found here:
https://www.freepatentsonline.com/5630384.pdf
This is an alternative to the electro-mechanical
'vibrator' known as "shower-of-sparks" that's been
around for about a century. SOS system use
ship's battery energy conducted through an
electro-mechanical interrupter (vibrator or
buzzer) to deliver a series of energy
pulses into the PRIMARY winding of a magneto
during 'points open' interval immediately following
a spark timing event. This method of spark
generation is not unlike the Kettering points/condenser/
coil system used on gazillions of cars. The
magneto's primary/secondary windings are used
as a combination energy storage and 'step up'
transformer to convert low voltage, high current
pulses in the primary into a stream of sparks at the
secondary which are conducted out to the plug(s)
by a distributor.
SlickStart does a similar thing but only uses
the step-up feature of the magneto's magnetics
to convert a stream of capacitor discharges
into the desired high voltage events at the
secondary.
The SS electronics don't really take much
power as we might guess from the recommended
size of the fuse. I've not yet found the
stated current draw in SlickStart literature
but the patent speaks to something on the
order of 3A consistent with the 5A fuse
callout.
Intermittent duty contactors can draw upwards
of 3-4 amps themselves. So the combination max
current would push a 5A fuse. I'd design for
10A in this circuit.
If one of the two loads is causing nuisance
trips of the fuse, I would suggest the following:
Put a 15A fuse in at the fuse-bus-block. Put
a temporary 7A fuse in series with the
starter contactor and SlickStart power leads
at the starter contactor coil terminal.
See if only one of those fuses blows thus
flagging a transient fault condition. If
the nuisance trips stop, try a 10A fuse at
the bus and remove the test fuses.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 2
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| Subject: | Re: Starter fuse blew x3 |
I found the problem. There was a short about 6 inches from the fuse block.
I let the wire lay up against a sheet metal edge. Thankfully it stopped
being intermittent and remained shorted during the search.
I'll change the fuse to a 10.
Joe, I'm familiar with the instructions for powering SlickStart from the
heavy terminal. Years back I had a bad experience doing that. The
(new-fangled at the time) permanent magnet starter would make enough
voltage spooling down that the retards stayed active. The engine would
sputter but never start. Since then I've just always wired them from the
control side. Works well. I'd love to hear from others using a PM starter
and SlickStart, wired per the instructions. Tough lesson though, and one
that's stayed with me.
Thanks for everyone's help.
--Dave
On Sun, Jan 23, 2022 at 12:21 PM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 12:56 PM 1/22/2022, you wrote:
>
> Thanks Ken.=C3=82 Do you mean the contacts in the solenoid attached to t
he
> starter?=C3=82 I've replaced the starter in the past but never serviced
the
> contacts.=C3=82 I can do that.
>
> The fuse that's blowing isn't in that circuit though.=C3=82 I should cla
rify
> my terms.=C3=82 The fuse that's blowing powers the starter contactor.=C3
=82 I
> called it the starter solenoid.=C3=82 The starter contactor coil has ded
icated
> external terminals for the coil and isn't associated with the high curren
t
> starter or solenoid wiring.=C3=82 Cleaning up the solenoid contacts is d
oable
> but I think my terminology muddied the waters.=C3=82 Or do you think sta
rting
> current is getting pulled through the starter relay coil?
>
>
> The SlickStart device is basically a capacitor discharge
> ignition system with a special feature, instead of delivering
> one really hot spark per timing event, it delivers a series
> of sparks for each timing event. You can get a peek inside
> this critter by reviewing a patent found here:
>
> https://www.freepatentsonline.com/5630384.pdf
>
> This is an alternative to the electro-mechanical
> 'vibrator' known as "shower-of-sparks" that's been
> around for about a century. SOS system use
> ship's battery energy conducted through an
> electro-mechanical interrupter (vibrator or
> buzzer) to deliver a series of energy
> pulses into the PRIMARY winding of a magneto
> during 'points open' interval immediately following
> a spark timing event. This method of spark
> generation is not unlike the Kettering points/condenser/
> coil system used on gazillions of cars. The
> magneto's primary/secondary windings are used
> as a combination energy storage and 'step up'
> transformer to convert low voltage, high current
> pulses in the primary into a stream of sparks at the
> secondary which are conducted out to the plug(s)
> by a distributor.
>
> SlickStart does a similar thing but only uses
> the step-up feature of the magneto's magnetics
> to convert a stream of capacitor discharges
> into the desired high voltage events at the
> secondary.
>
> The SS electronics don't really take much
> power as we might guess from the recommended
> size of the fuse. I've not yet found the
> stated current draw in SlickStart literature
> but the patent speaks to something on the
> order of 3A consistent with the 5A fuse
> callout.
>
> Intermittent duty contactors can draw upwards
> of 3-4 amps themselves. So the combination max
> current would push a 5A fuse. I'd design for
> 10A in this circuit.
>
> If one of the two loads is causing nuisance
> trips of the fuse, I would suggest the following:
>
> Put a 15A fuse in at the fuse-bus-block. Put
> a temporary 7A fuse in series with the
> starter contactor and SlickStart power leads
> at the starter contactor coil terminal.
>
> See if only one of those fuses blows thus
> flagging a transient fault condition. If
> the nuisance trips stop, try a 10A fuse at
> the bus and remove the test fuses.
>
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
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