Today's Message Index:
----------------------
1. 02:48 AM - Flaps system tripping the circuit breaker (Carlos Trigo)
2. 04:16 AM - Re: Flaps system tripping the circuit breaker (Charles Kuss)
3. 04:46 AM - Re: Flaps system tripping the circuit breaker (Charlie England)
4. 04:46 AM - Re: Flaps system tripping the circuit breaker (Rob Turk)
5. 07:16 AM - Re: IVO Prop current limiter (merlewagner2)
6. 10:43 AM - Re: Flaps system tripping the circuit breaker (Robert L. Nuckolls, III)
7. 10:51 AM - Re: Flaps system tripping the circuit breaker (Robert L. Nuckolls, III)
8. 08:40 PM - Re: Flaps system tripping the circuit breaker (Bill Watson)
Message 1
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| Subject: | Flaps system tripping the circuit breaker |
One of my aviator friends called me to help him solving a problem in his
RV-7 flaps system.
He told me that occasionally, when he retracts the flaps, the correspondent
Circuit Breaker trips. But not always, so he resets the CB and the flaps
keep working normally.
I asked him to measure the current during the flaps movement, and he
measured 1 to 2 A when extending and when retracting, but he noticed that
after full retraction the current went to 7 A.
That explains why the CB (5A) trips.
I think most of you know that the flaps system in an RV airplane is powered
by an electric motor with 2 wires, which make the flaps work in both senses,
just with reversing the electrons movement on those 2 wires. You also
probably know that the motor doesn't stop at both ends if you don't release
the switch, so the motor keeps turning even when the flaps reach full
extension and full retraction.
Now the question: which can be the reason for the current peak that the
motor is reaching at full retraction?
Any help welcome
Thanks
Carlos
Message 2
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| Subject: | Re: Flaps system tripping the circuit breaker |
Due to the mostly vertical orientation of the motor, the grease in the bearings
will sometime migrate down onto the commutator/brush area of the armature. This
is a common issue. It requires removal and disassembly of the motor to clean
the grease off the armature and re-grease the bearings.
Charlie
--------------------------------------------
On Sun, 5/21/17, Carlos Trigo <trigo@mail.telepac.pt> wrote:
Subject: AeroElectric-List: Flaps system tripping the circuit breaker
To: aeroelectric-list@matronics.com
Date: Sunday, May 21, 2017, 5:47 AM
One of my aviator friends
called me to help him solving a problem in his RV-7 flaps
system.He told me that
occasionally, when he retracts the flaps, the correspondent
Circuit Breaker trips. But not always, so he resets the CB
and the flaps keep working normally. I asked him to measure the
current during the flaps movement, and he measured 1 to 2 A
when extending and when retracting, but he noticed that
after full retraction the current went to 7 A.That explains why the CB (5A)
trips. I think most of you know that
the flaps system in an RV airplane is powered by an electric
motor with 2 wires, which make the flaps work in both
senses, just with reversing the electrons movement on those
2 wires. You also probably know that the motor doesnt
stop at both ends if you dont release the switch, so
the motor keeps turning even when the flaps reach full
extension and full retraction. Now the question: which can
be the reason for the current peak that the motor is
reaching at full retraction? Any help welcomeThanksCarlos
Message 3
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| Subject: | Re: Flaps system tripping the circuit breaker |
On Sun, May 21, 2017 at 4:47 AM, Carlos Trigo <trigo@mail.telepac.pt> wrote
:
> One of my aviator friends called me to help him solving a problem in his
> RV-7 flaps system.
>
> He told me that occasionally, when he retracts the flaps, the
> correspondent Circuit Breaker trips. But not always, so he resets the CB
> and the flaps keep working normally.
>
>
> I asked him to measure the current during the flaps movement, and he
> measured 1 to 2 A when extending and when retracting, but he noticed that
> after full retraction the current went to 7 A.
>
> That explains why the CB (5A) trips.
>
>
> I think most of you know that the flaps system in an RV airplane is
> powered by an electric motor with 2 wires, which make the flaps work in
> both senses, just with reversing the electrons movement on those 2 wires.
> You also probably know that the motor doesn=99t stop at both ends i
f you
> don=99t release the switch, so the motor keeps turning even when th
e flaps
> reach full extension and full retraction.
>
>
> Now the question: which can be the reason for the current peak that the
> motor is reaching at full retraction?
>
>
> Any help welcome
>
> Thanks
>
> Carlos
>
>
My 1st guess is that the flap linkage is slightly out of adjustment. If the
flaps hit their stops before the motor reaches full retraction, it would
still trying to pull instead of free-wheeling.
My 2nd guess (after looking at the 10A flaps breaker in my RV-4, and
looking at the specs for the motor that's inside the actuator) is that he's
using the wrong breaker.
Corollary to my 2nd guess is that he's holding the up button too long. :-)
Charlie
Message 4
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| Subject: | Re: Flaps system tripping the circuit breaker |
Is there a functional limit switch in this system? If you hit the
physical end of travel for the flap system and there's no limit switch,
the motor will keep on pulling at maximum power. Current draw will be a
lot higher and if it wasn't for the CB, you'd probably burn up the motor.
On 5/21/2017 11:47 AM, Carlos Trigo wrote:
>
> One of my aviator friends called me to help him solving a problem in
> his RV-7 flaps system.
>
> He told me that occasionally, when he retracts the flaps, the
> correspondent Circuit Breaker trips. But not always, so he resets the
> CB and the flaps keep working normally.
>
> I asked him to measure the current during the flaps movement, and he
> measured 1 to 2 A when extending and when retracting, but he noticed
> that after full retraction the current went to 7 A.
>
> That explains why the CB (5A) trips.
>
> I think most of you know that the flaps system in an RV airplane is
> powered by an electric motor with 2 wires, which make the flaps work
> in both senses, just with reversing the electrons movement on those 2
> wires. You also probably know that the motor doesnt stop at both ends
> if you dont release the switch, so the motor keeps turning even when
> the flaps reach full extension and full retraction.
>
> Now the question: which can be the reason for the current peak that
> the motor is reaching at full retraction?
>
> Any help welcome
>
> Thanks
>
> Carlos
>
Message 5
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| Subject: | Re: IVO Prop current limiter |
Bob,
When you get the new circuit up I would be very interested in purchasing. Have
the Ivo mag prop which will be interfacing with a Viking Turbo 170HP. Should be
interesting to see the performance.
Merle
--------
KC1DNJ
General Radiotelephone
Commercial SEL
A&P
Building scale P51
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=469481#469481
Message 6
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| Subject: | Re: Flaps system tripping the circuit breaker |
At 06:14 AM 5/21/2017, you wrote:
>
>Due to the mostly vertical orientation of the motor, the grease in
>the bearings will sometime migrate down onto the commutator/brush
>area of the armature. This is a common issue. It requires removal
>and disassembly of the motor to clean the grease off the armature
>and re-grease the bearings.
Contamination of the commutator can indeed
manifest in mis-behavior of the motor but
not over-current. Are these ball bearings?
If so, they are most likely a metric standard.
You might fix the problem with factory lubricated,
sealed bearings.
Bob . . .
Message 7
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| Subject: | Re: Flaps system tripping the circuit breaker |
>
>
>My 1st guess is that the flap linkage is
>slightly out of adjustment. If the flaps hit
>their stops before the motor reaches full
>retraction, it would still trying to pull instead of free-wheeling.
>
>My 2nd guess (after looking at the 10A flaps
>breaker in my RV-4, and looking at the specs for
>the motor that's inside the actuator) is that he's using the wrong breaker.
>
>Corollary to my 2nd guess is that he's holding the up button too long. :-)
=C2
>
>Charlie
Agreed. The spec sheet shows a motor resistance of
0.83 ohms. Add another few tenths of an ohm for wiring
and we still have an inrush current potential on the
order of 10 amps. So yes, the 5A breaker MIGHT be
marginal . . . but I would expect it to operate on
both extend or retract cycles . . . especially
extend when the motor is pushing flaps into
the slip-stream.
So your first guess sounds like the right one . . .
the flaps are hitting mechanical stops and
stalling the motor . . .
Well adjusted limit switches would be a
sanitary solution.
Bob . . .
Message 8
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| Subject: | Re: Flaps system tripping the circuit breaker |
Just an aside but this issue helps justify the decision to make the only
CBs in my RV for the AP, the voltage regulator and flaps (none have
tripped to date however). Everything else is protected by fuses that I
don't intend to 'reset' in the air
Bill "keeping the pilot as proficient as the plane is the perpetual
challenge" Watson
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