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Flaps system tripping the circuit breaker

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trigo(at)mail.telepac.pt
Guest

Posted: Sun May 21, 2017 1:48 am Post 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

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chaskuss(at)yahoo.com
Guest

Posted: Sun May 21, 2017 3:16 am Post subject: 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(at)mail.telepac.pt> wrote:



 Subject: Flaps system tripping the circuit breaker

 To: aeroelectric-list(at)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. Â 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. Â 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 doesnâ€™t

 stop at both ends if you donâ€™t release the switch, so

 the motor keeps turning even when the flaps reach full

 extension and full retraction. Â Now the question: which can

 be the reason for the current peak that the motor is

 reaching at full retraction? Â Any help welcomeThanksCarlosÂ   Â

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ceengland7(at)gmail.com
Guest

Posted: Sun May 21, 2017 3:46 am Post subject: Flaps system tripping the circuit breaker

On Sun, May 21, 2017 at 4:47 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:

 	  Quote: 	
		  

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.

Â 

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.

Â 

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 doesnâ€™t stop at both ends if you donâ€™t release the switch, so the motor keeps turning even when the flaps reach full extension and full retraction.

Â 

Now the question: which can be the reason for the current peak that the motor is reaching at full retraction?

Â 

Any help welcome

Thanks

CarlosÂ  

Â 



	


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. Â 

Charlie

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matronics(at)rtist.nl
Guest

Posted: Sun May 21, 2017 3:46 am Post subject: 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:

     

      	  Quote: 	
		                         <![endif]-->   <![endif]-->                

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

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Mauledriver(at)nc.rr.com
Guest

Posted: Sun May 21, 2017 7:40 pm Post subject: 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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wstucklen1(at)cox.net
Guest

Posted: Mon May 22, 2017 4:29 am Post subject: Flaps system tripping the circuit breaker

First, the flap system in the RV’s has a clutch for travel to both ends of travel, so the flap motor never 

actually goes into a stall condition. The motor current only goes up less than 2 amps over normal

ground bases travel currents.

 

Second, aerodynamic pressures on the flaps raise the flap motor current significantly. To the point

That a 7 amp fuse or circuit breaker will definitely trip. And from my experiences in multiple RV’s I 

Know that while flying, a trip can happen while extending or retracting the flaps.

 

I strongly suggest that you need to increase the amp rating of your circuit protection to at least

10 amps. If you do that, your problems will go away…. All the planes listed below have had 10 Amp

Circuit protections, and did not trip during flight….

 

Fred Stucklen

N924RV  1395 Hrs  Flying

N926RV   875 Hrs  Sold

N925RV 2008 Hrs  Sold

 

 

      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

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