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bicyclop(at)pacbell.net
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 Posted: Mon Aug 15, 2011 3:59 pm Post subject: Will servo run to outer position if PWM signal is missing? |
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Are you using the Navaid instrument? Is it tracking a GPS course? Are you in the air or on the ground? It is probably commanding a turn and it will run the servo to the stop until it sees some results.
Ed Holyoke
On 8/15/2011 2:31 PM, zwakie wrote: [quote] | Quote: | --> AeroElectric-List message posted by: "zwakie" <mz(at)cariama.nl> (mz(at)cariama.nl)
I am trying to troubleshoot an issue with my Navaid servo. Immediately upon engaging the servo, it will run the aileron to full left.
I was wondering if this could be caused by the PWM signal missing, f.i. Because of a broken wire.
Can anybody enlighten this knows-nothing-about-electrics guy please?
--------
Marcel
(Classic Tri-Gear PH-MZW - formerly G-BWON)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=349540#349540
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zwakie
Joined: 03 Aug 2009
Posts: 157
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| Posted: Mon Aug 15, 2011 11:22 pm Post subject: Re: Will servo run to outer position if PWM signal is missi |
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Thanks Ed for your answer and questions.
I am indeed using a Navaid servo. It gives me full aileron deflection in every situation, with and without tracking a flightplan, with and without following a heading, in the ground and in the air.
As soon as the servo receives power it will give me full left aileron, no matter the situation and configuration of the head.
I can think of two things causing this: (1) servo zero position sits outside the zone of travel, or (2) PWM signal not reaching the servo, e.g. a broken wire that carries the PWM signal.
First scenario seems unlikely to me, because from a safety point of view I cannot believe the design would allow it to change from the set point. I am not trusting this assumption to be 100% true, so can't rule this option out.
Second scenario is the one that I have no clue about, because I lack the technical knowledge. Hence my question whether it would be technically possible that the servo runs to an outer position if the PWM signal is missing.
Because the servo sits under the passenger seat in a very confined area, before starting the juggle to remove the servo, I would like to know what happens if the PWM signal is missing (I guess I can run a parallel wire with the PWM signal to the servo, that at least would tell me that the servo indeed receices the signal, right?)
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_________________
Marcel Zwakenberg
Europa XS TG || 912ULS || PH-SBR |
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