Today's Message Index:
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1. 07:45 AM - Erratic voltage output (MacDonald Doug)
2. 08:12 AM - Re: Erratic voltage output (FLYaDIVE)
3. 02:57 PM - Re: Erratic voltage output (Roger Lee)
Message 1
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| Subject: | Erratic voltage output |
I'm having an erratic voltage output problem on my 912UL powered CH-701.-
=0A=0ATo try and fix the problem I have replaced the voltage regulator and
verified I have no loose connections in the electrical system.- Even wit
h a new regulator I am still getting the same voltage spikes when at full p
ower.- At idle and during run-up the voltage reading on my analog VDO vol
tmeter is rock solid.- It indicates about 14 volts once up off of idle po
wer and my digital voltmeter show about 13.6 Volts.- Once I apply takeoff
power the analog voltmeter needle starts to vibrate wildly plus and minus
about 1-2 volts and the digital voltmeter becomes unstable.- If I am flyi
ng with a light electrical load, the digital voltmeter tops out at just ove
r 14 volts but drifts around as low as 13.7.- If I put on my nav and stro
be lights the voltage drops to 13.3-13.6 range but the needle on the analog
meter continues to vibrate the same.=0A=0AThe only other components (besid
e the regulator) in the electrical system I can think of which might be cau
sing the voltage spikes are the capacitor or a problem with the actual alte
rnator coils.- I thought the problem may have been a bad analog gauge but
given that the digital readings are also erratic I believe it to be a legi
timate issue and not simply a display problem.=0A=0AI'm pretty good at chas
ing electrons but this issue has me stumped.- Anyone have any ideas what
could be causing my erratic voltage output?=0A=0ADoug MacDonald=0ACH-701, N
orthwestern Ontario
Message 2
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| Subject: | Re: Erratic voltage output |
Doug:
1. Being that your Analog Gauge is vibrating indicates that you may have
a Vibration issue... Such as being in need of a Dynamic Prop Balance.
2. For a battery to charge you need 13.8 to 14.2 VDC - Less than that
you are not charging.
3. Being that the voltage is correct at idle and fluxuates at cruise
speed could be an indication of (a) A heat issue or (b) A vibration issue
or (c) Both
4. There are a few funky issues with Rotax and their internal voltage
production - Too Bad Rotax has never solved this problem.
*Barry*
*"Pilots think they are mechanics, because they can buy tools at
Home Depot."*
On Fri, Jun 14, 2013 at 10:44 AM, MacDonald Doug <dougsnash@yahoo.com>wrote:
> I'm having an erratic voltage output problem on my 912UL powered CH-701.
>
> To try and fix the problem I have replaced the voltage regulator and
> verified I have no loose connections in the electrical system. Even with a
> new regulator I am still getting the same voltage spikes when at full
> power. At idle and during run-up the voltage reading on my analog VDO
> voltmeter is rock solid. It indicates about 14 volts once up off of idle
> power and my digital voltmeter show about 13.6 Volts. Once I apply takeoff
> power the analog voltmeter needle starts to vibrate wildly plus and minus
> about 1-2 volts and the digital voltmeter becomes unstable. If I am flying
> with a light electrical load, the digital voltmeter tops out at just over
> 14 volts but drifts around as low as 13.7. If I put on my nav and strobe
> lights the voltage drops to 13.3-13.6 range but the needle on the analog
> meter continues to vibrate the same.
>
> The only other components (beside the regulator) in the electrical system
> I can think of which might be causing the voltage spikes are the capacitor
> or a problem with the actual alternator coils. I thought the problem may
> have been a bad analog gauge but given that the digital readings are also
> erratic I believe it to be a legitimate issue and not simply a display
> problem.
>
> I'm pretty good at chasing electrons but this issue has me stumped.
> Anyone have any ideas what could be causing my erratic voltage output?
>
> Doug MacDonald
> CH-701, Northwestern Ontario
>
> *
>
> *
>
>
Message 3
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| Subject: | Re: Erratic voltage output |
Hi Doug,
This happens when the ground is poor. Try a test. leave the existing ground in
place and install a more direct and solid ground from the battery, to the engine
to the wiring ground block for the plane. I have had numerous issues like this
I cured by installing a much more direct and solid ground.
It won't hurt to try it and rule it out as a factor.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
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http://forums.matronics.com/viewtopic.php?p=402709#402709
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