Today's Message Index:
----------------------
1. 04:37 AM - Re: Low Battery Voltage Blows Fuel Pump Fuse? (user9253)
2. 01:55 PM - Re: Re: Low Battery Voltage Blows Fuel Pump Fuse? (Robert L. Nuckolls, III)
3. 10:14 PM - Noisy Alternator? (Paul Millner)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Low Battery Voltage Blows Fuel Pump Fuse? |
The original poster has reported on VansAirforce that a new PC680 battery cured
the fuel pump fuse blowing problem.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=480373#480373
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Low Battery Voltage Blows Fuel Pump Fuse? |
At 06:36 AM 5/24/2018, you wrote:
>
>The original poster has reported on VansAirforce that a new PC680
>battery cured the fuel pump fuse blowing problem.
>
>--------
Nothing like a repeatable experiment
to add foundation to a theory. It seems
that these pumps suffer anomalous behaviors
during a brown-out condition. I.e. the
the duration of the on-pulse to the
solenoid winding exceeds normal expectations
in duty-cycle limited coil current.
The reason for brownout can be any combination
of things including soggy battery, ship's wiring
and/or architecture and excessive starter current.
One easy fix would be to upsize the fuse. Recall that 20A
won't burn a 22AWG wire . . . so increasing the pump
fuse to 10A might just well be a reasonable work-around.
Obviously, if the battery is getting soggy (do a load
test) then replacing the battery is in order for a host
of reasons. Also, moving the distribution feeder for
the pump to the battery bus would bypass other voltage
drops in ship's wiring and be in agreement with the
philosophy of running all eletro-whizzies for electrically
dependent engines from the battery bus.
I've got one of those pumps around here somewhere left
over from some energy studies about 20 years ago . . .
haven't got time for a diligent hunt right now but
if it turns up, I'll go to the bench to see if I can
duplicate the behavior here.
In the mean time, if anyone on the List can conduct
the same experiment, it would be good data to gather.
Speaking of bench supplies: There are some pretty
attractive offers out there
https://goo.gl/SD52Po
https://goo.gl/vknsmw
. . . at prices like these, everyone should have one.
Bob . . .
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Noisy Alternator? |
After a couple of weeks of airplane downtime (we went to a birthday
party in England via commercial transportation), my StrikeFinder lights
up all the time now. Troubleshooting demonstrates that shutting down the
alternator stops the apparent sparks. The problem persists after five
hours of flying now.
Is it most likely that my Ford alternator's brushes didn't like the
hiatus, or coincidentally developed a problem? I've got a solid state
regulator, PlanePower, so I don't envision it's causing the sparking.
http://www.secure4host.net/upload/files/AlternatorStrikeFinder.jpg
Paul
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|