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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Fri May 15, 2009 9:21 am Post subject: Crowbar

I received my Crowbar OV-14 module along with other parts for my external power project.



Perhaps because of the importance of the task, or maybe because of the macho name "Crowbar", I kind of expected a big meaty device with attitude and tatoos ... Something that would belong on a De Havilland that McGyver could use to save the world and then cook his dinner.



Needless to say I was surprised at the scrawny little twirp that looked like it belonged in a Chinese toy robot.



(just funnin' with ya Bob).



Nevertheless, my whole life has been doing more with less, so I have 100% confidence in this dohicky, I just have a couple of questions.



Is this thingy a one time protector?  Does it give its life to an overvoltage and you snip it off like a foreskin and replace it?  Or does it reset itself and endure forever?



What is the best way to install it?  Just wire it in and tie wrap it somewhere?  

Does anyone have a picture of a proper installation?



Thanks in advance.

_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

trigo(at)mail.telepac.pt
Guest

Posted: Fri May 15, 2009 10:12 am Post subject: Crowbar

Myron  

   

Very well described, I mean the sensation you had. It was exactly the same I had when I received that CROWBAR OV-14 little black critter…  

Well, perhaps I couldn’t have remembered what McGiver could do with it … J  

   

Carlos  

   

   

[quote] --

mprather(at)spro.net
Guest

Posted: Fri May 15, 2009 10:13 am Post subject: Crowbar

The little pipsqueak should last a long time..   All it has to do is fault

the 5A breaker and drag the field pin down (if it has an external

regulator).  I believe the SCR selected is up to repeated trips without

any trauma.  If I'm reading the specs correctly, it will handle 16A

without problem (with proper cooling).

Regards,



Matt-



 	  Quote: 	
		   



 I received my Crowbar OV-14 module along with other parts for my external

 power project.



 Perhaps because of the importance of the task, or maybe because of the

 macho name "Crowbar" I kind of expected a big meaty device with attitude

 and tatoos.  Something that would belong on a De Havilland that McGyver

 could use to save the world and then cook his dinner.



 Needless to say I was surprised at the scrawny little twirp that looked

 like it belonged in a Chinese model airplane.



 (just funnin' with ya Bob).



 Nevertheless, my whole life has been doing more with less, so I have 100%

 confidence in this dohicky, I just have a couple of questions.



 Is this thingy a one time protector?  Does it give its life to an

 overvoltage and you snip it off like a foreskin and replace it?  Or does

 it reset itself and endure forever?



 What is the best way to install it?  Just wire it in and tie wrap it

 somewhere?

 Does anyone have a picture of a proper installation?



 Thanks in advance.



 --------

 Myron Nelson

 Mesa, AZ

 Emp completed, legacy build fuse in progress





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 44172#244172

nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 15, 2009 11:42 am Post subject: Crowbar

At 12:21 PM 5/15/2009, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "woxofswa" <woxof(at)aol.com>



 I received my Crowbar OV-14 module along with other parts for my external power project.



 Perhaps because of the importance of the task, or maybe because of the macho name "Crowbar" I kind of expected a big meaty device with attitude and tatoos.  Something that would belong on a De Havilland that McGyver could use to save the world and then cook his dinner.



 Needless to say I was surprised at the scrawny little twirp that looked like it belonged in a Chinese model airplane.



 (just funnin' with ya Bob).



 Nevertheless, my whole life has been doing more with less, so I have 100% confidence in this dohicky, I just have a couple of questions.



 Is this thingy a one time protector?  Does it give its life to an overvoltage and you snip it off like a foreskin and replace it?  Or does it reset itself and endure forever? 	


    It's job is over less than 100 milliseconds after

    onset of an OV condition. It forces the 5A field

    supply breaker open. It will do this many times

    without breaking a sweat.



  	  Quote: 	
		  What is the best way to install it?  Just wire it in and tie wrap it somewhere?  

 Does anyone have a picture of a proper installation? 	




    Tie-wrap it to a wire bundle. It's okay

    to let the body hang on the leads.



  	  Quote: 	
		  Thanks in advance. 	




    I fussed over packaging for some time. I was

    looking for a process and materials that provided

    adequate protection while keeping costs low.

    When you have an assembled ECB this small



 [img]cid:.0[/img]



    How's the best way to package it? Potting (full

    encapsulation) is messy, slow and makes the thing

    difficult to diagnose for field failures . . . impossible

    to repair.



    The double melting wall heat-shrink provides an

    envelope that can be put on in seconds, offers

    good shielding from contaminants. It can be

    cut away for repairs, field failure diagnosis

    or re-adjustment.



    Our next line of products will be offered in

    an enclosure like this:



 [img]cid:.1[/img]



 

     I have hundreds of plastic boxes with pre-cut d-sub

     connector holes in the top. Cost of box and lid is

     under $2. While the box is glued shut, it's fast to

     assemble, easy to cut off, easy to replace after

     repairs are made, etc.



     I really considered reviving the CbOVM-14 in

     this housing but that would ADD the costs of enclosure

     and connector. Not consistent with my design and

     marketing goals.



 

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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johngoodman

Joined: 18 Sep 2006
Posts: 530
Location: GA

Posted: Tue May 26, 2009 11:25 am Post subject: Re: Crowbar

Bob,

I'm following the Z-31A schematic for a military style ground power jack, and I'm ordering parts. I've found everything except for the OVM-14 Crowbar O.V. Module. I called B&C sales and they referred me to a part number 504-1 , which is something for an alternator with a lot of pieces. How do I get just the OVM-14?

John

_________________
#40572 Phase One complete in 2011

nuckolls.bob(at)aeroelect
Guest

Posted: Tue May 26, 2009 12:31 pm Post subject: Crowbar

At 02:25 PM 5/26/2009, you wrote:

 	  Quote: 	
		  

<johngoodman(at)earthlink.net>



Bob,

I'm following the Z-31A schematic for a military style ground power 

jack, and I'm ordering parts. I've found everything except for the 

OVM-14 Crowbar O.V. Module. I called B&C sales and they referred me 

to a part number 504-1 , which is something for an alternator with a 

lot of pieces. How do I get just the OVM-14?


	


   They're in production in our shop now. I don't have

   them on the catalog yet. Fill out an order at:



https://matronics.com/aeroelectric/Catalog/AECcatalog.html



   and put "1ea CbOVM-14 (at) $25.00" in the comments box.



        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Mon Jun 15, 2009 11:24 am Post subject: Re: Crowbar

I am finishing up the installation of my external power receptacle.



Just to be totally sure, please verify that the orange lead from the OVM14 is the positive lead and goes on the left terminal of the smaller posts on the contactor?



Thanks in advance.

_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

nuckolls.bob(at)aeroelect
Guest

Posted: Tue Jun 16, 2009 5:23 am Post subject: Crowbar

At 02:24 PM 6/15/2009, you wrote:

 	  Quote: 	
		  



I am finishing up the installation of my external power receptacle.



Just to be totally sure, please verify that the orange lead from the 

OVM14 is the positive lead and goes on the left terminal of the 

smaller posts on the contactor?


	


   Yes, the non-black lead is (+). The exact color

   was changed to identify mod levels in the construction.

   Don't know about the "left" terminal. The (+) lead

   of the crowbar module goes to the (+) supply termnial

   of the contactor . . . the black lead goes to the

   terminal that is connected to the ground power control

   breaker.

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

plevyakh

Joined: 10 Jan 2011
Posts: 39

Posted: Tue Sep 18, 2012 1:08 pm Post subject: Re: Crowbar (engine side) or cool panel side to install?

Guys,

I'm installing the CbOVM-14 OV Protection module and wanted to confirm if it's ok to install this on the engine side of the firewall (HOT), or should I put it on the Instrument Panel side (COOL).



It would be a little easier with wiring to zip tie it onto my Ground Power contactor terminal wires on the engine side, but I didn't want to do this if over the airplane life I'd eventually fry the thing.



Sounds like either side I choose, the installation mount method is to just tie wrap it to some wires.  If others have a better idea, I'd appreciate the tips.



TIA for your comments and help!

Howard

_________________
Howard Plevyak
GlaStar / Cincinnati, Ohio

nuckolls.bob(at)aeroelect
Guest

Posted: Tue Sep 18, 2012 7:11 pm Post subject: Crowbar

At 04:08 PM 9/18/2012, you wrote:




Guys,

I'm installing the CbOVM-14 OV Protection module and wanted to 

confirm if it's ok to install this on the engine side of the firewall 

(HOT), or should I put it on the Instrument Panel side (COOL).



It would be a little easier with wiring to zip tie it onto my Ground 

Power contactor terminal wires on the engine side, but I didn't want 

to do this if over the airplane life I'd eventually fry the thing.



   it won't be damaged . . . but htey do have

   a temperature coefficient of voltage greater

   than I would like.



Sounds like either side I choose, the installation mount method is to 

just tie wrap it to some wires.  If others have a better idea, I'd 

appreciate the tips.



   That will work . . . and it would be best to

   install it in the cockpit.

   Bob . . .

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