VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 03-01-2015, 08:22 AM
dspender dspender is offline
 
Join Date: May 2009
Location: Bay City, MI
Posts: 416
Default Door latch indicator

Following the installation instructions for the latch indicator; as the magnet sets at the mouth of the latch pin my ohmmeter shows continuity. Following directions, as I advance the magnet deeper into the pin the continuity disappears. That is no different than if I did not have the magnet in the latch pin or the door was not fully latched. Can you explain in simple electrical terms, like 5th grade, why I need to advance the magnet into the latch pin until the Reed Switch opens, ie shows no continuity?
__________________
Dennis
Reply With Quote
  #2  
Old 03-01-2015, 08:47 AM
N427EF N427EF is offline
 
Join Date: Oct 2005
Posts: 1,510
Default

The door open warning lights will be ONin your panel as long as there is continuity across the reed switch
When the magnet closes in on the switch and opens the contacts, the electrons stop flowing to the relay and the relay turns the light off in panel.
Without the magnets your lights would stay on.

There are many variation on installing these but this is what Van intended.
Keep it simple.
__________________
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 400 plus hours
Over 2500 Gallons of E10 mogas burned
Don't believe everything you know.
Reply With Quote
  #3  
Old 03-01-2015, 09:35 AM
Nukeflyboy Nukeflyboy is offline
 
Join Date: Aug 2007
Location: Granbury, TX
Posts: 93
Default Door latch indicator

Yep, that is right. Relay/switch contactors are either "normally open" or "normally closed", which describe their de-energized state (or un-magnitized). A normally open conact closes when energized (like a relay) or closes when magnitized (as in a reed switch). Some relays have both connections and they are labeled NO or NC.

This gives you a lot of wiring options.
__________________
Dave Moore
Granbury, TX
RV-10 and Breezy
Reply With Quote
  #4  
Old 03-01-2015, 09:39 AM
9GT's Avatar
9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,494
Default

I discarded my Van's magnetic switches and used normally "ON" micro switches that make contact with the tips of the latch pins. I have them adjusted so they do not break contact until the pins are fully engaged and the interior door handle is locked in full closed position.
__________________
David C.
Howell, MI

RV-9A: Under Construction. N161RV (Reserved)
RV-10: N959RV Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2018
Reply With Quote
  #5  
Old 03-01-2015, 09:48 AM
Mike S's Avatar
Mike S Mike S is online now
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,314
Default

Quote:
Originally Posted by dspender View Post
Can you explain in simple electrical terms, like 5th grade, why I need to advance the magnet into the latch pin until the Reed Switch opens, ie shows no continuity?
Yes, folks are used to energizing a relay to turn something on.

In this case, the relay is being used to turn the lights off when energized.

Vans does this by using the NC contacts to power the light through the relay.
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #6  
Old 03-01-2015, 11:11 AM
dspender dspender is offline
 
Join Date: May 2009
Location: Bay City, MI
Posts: 416
Default

This is the instructions included with the kit. See if the bolded area gives you any trouble like it is giving me.

5. Close and fully latch the door
6. Connect a continuity tester or Ohm Meter to the two wires on the rear switch. In its current state with no magnet present, the switch is open and will measure no continuity or infinite resistance.
7. Slide the magnet that was supplied with the Magnetic Reed Contact Switch in the Aft latch Pin. As you insert the magnet you will see evidence on the tester of the switch closing. Use something non ferrous to slide the magnet forward in the latch pin until the switch opens. Take note of the depth you push the magnet into the latch in.
8. Slip something ferrous in the Aft Latch Pin and pull out the magnet.
9. Unlatch and open the left door. Apply epoxy into the latch pin. Close and latch the door. Insert the magnet into the end of the latch pin. Use something nonferrous to slowly slide the magnet forward in the latch pin until the tester just indicates that the switch opens. let the epoxy cure.

My concern is if I slide the magnet forward in the latch pin until the tester just indicates that the switch opens, the indicator lights would suggest the door is not latched. I believe I need to slide the magnet in enough so that just before the tester would indicate open, I stop before that point. What do you think?
__________________
Dennis
Reply With Quote
  #7  
Old 03-01-2015, 11:21 AM
Bill.Peyton's Avatar
Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,647
Default

The reasoning for using the normally closed switch is the default switch condition creates continuity without the use of a relay. To extinguish the door open light, the magnet must be inserted next to the reed switch to cause it to close.
I too used a micro switch rather than the magnetic switch. My switches will not make contact unless the pin is fully engaged.
__________________
Bill Peyton
RV-10 - 875 Hrs
First Flight Oct 2012
WA0SYV
Aviation Partners, LLC
Reply With Quote
  #8  
Old 03-01-2015, 01:41 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 7,788
Default

The system is design the way it is, to prevent the possibility of a system failure giving a false indication that the door was safe when it was not.
If the supplied switches and relay are used, a shorted or broken wire, anywhere between the relay and the switches should be unable to produce a false positive that a door is latched.
__________________
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
Reply With Quote
  #9  
Old 03-01-2015, 02:50 PM
BigD BigD is offline
 
Join Date: Jul 2012
Location: MS
Posts: 302
Default

Re-read Mike and Bill's answer - I think you're conflating the switch being open with the door indicating (or being) open.

It is confusing.

==dave==
Reply With Quote
  #10  
Old 03-01-2015, 03:13 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,350
Default

Quote:
Originally Posted by dspender View Post
This is the instructions included with the kit. See if the bolded area gives you any trouble like it is giving me.

5. Close and fully latch the door
6. Connect a continuity tester or Ohm Meter to the two wires on the rear switch. In its current state with no magnet present, the switch is open and will measure no continuity or infinite resistance.
7. Slide the magnet that was supplied with the Magnetic Reed Contact Switch in the Aft latch Pin. As you insert the magnet you will see evidence on the tester of the switch closing. Use something non ferrous to slide the magnet forward in the latch pin until the switch opens. Take note of the depth you push the magnet into the latch in.
8. Slip something ferrous in the Aft Latch Pin and pull out the magnet.
9. Unlatch and open the left door. Apply epoxy into the latch pin. Close and latch the door. Insert the magnet into the end of the latch pin. Use something nonferrous to slowly slide the magnet forward in the latch pin until the tester just indicates that the switch opens. let the epoxy cure.

My concern is if I slide the magnet forward in the latch pin until the tester just indicates that the switch opens, the indicator lights would suggest the door is not latched. I believe I need to slide the magnet in enough so that just before the tester would indicate open, I stop before that point. What do you think?
Have you read all of the instructions? I do not recall exactly but I thought after the epoxy dried I adjusted the sensor position to get it to just close contacts with the door closed.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 11:35 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.