[time-nuts] Power connectors continued

Thu Jun 22 21:33:56 EDT 2017

Hi

… but not a Cannon connector. If you get those inserts along with a few signal leads, they
are up into the $50 to $200 a pair range. They also don’t do terribly well in vibration. 

Bob

> On Jun 22, 2017, at 8:34 PM, Arnold Tibus <arnold.tibus at gmx.de> wrote:
> 
> Bob,
> 
> look to this spec. data from Amphenol found @ Mouser as example:
> 
> Current Rating:
> power Contacts: 55 Amperes (per contact)
> Signal Contacts: 5 Amperes (per contact)
> Contact Resistance:
> Power Contacts: .25 milliohms max
> Signal Contacts: 20 milliohms max
> Insulation Resistance: 5000 Megohms
> DWV: 1500V DC
> Operating Temperature: -40°C to +105°C
> 
> http://www.mouser.com/ds/2/18/LCC17_BRO-44772.pdf
> 
> ok, for shure more expensive (LCC17-A3W3SM-2N0, <http://www.mouser.de/ProductDetail/Amphenol-Commercial-Products/LCC17-A3W3SM-2N0/?qs=sGAEpiMZZMv3qGlUeJulRG8yb3Pdn%252bYMJfJuKobi5wY%3d> $ 9.45 per con. one side, solder connection)
> http://www.mouser.com/ds/2/276/Mixed_Layout-472362.pdf e.g. for crimped contacts
> 
> Not of interest?
> 
> But sorry, even being very interesting, I think we should not stress too much the term 'time' in this discussion here ;-) .
> 
> kind regards
> Arnold, DK2WT
> 
> 
> Am 23.06.2017 um 01:33 schrieb Bob kb8tq:
>> Hi
>> 
>> You can get and use PP’s at 30 to 50A in a 12V circuit without frying them or the cable they are
>> attached to. Doing the same with a “Cannon” connector is not at all easy ….You can also bump up
>> to the larger PP’s and get into a couple of hundred amps.
>> 
>> Bob
>> 
>>> On Jun 22, 2017, at 6:54 PM, Arnold Tibus <arnold.tibus at gmx.de> wrote:
>>> 
>>> 
>>> Hello,
>>> 
>>> I can second Magnus and want to throw in some more details.
>>> Cannon, Deutsch, Bendix, Souriau, Matrix, Amphenol,  etc. etc. are (big)
>>> companies manufacturing all kind of connectors and are  n o t  connector
>>> type designations! Important are the type numbers of the manufacturer or
>>> higher level specification numbers.
>>> We used in the aircraft and spacecraft business naturally the military
>>> (MS-) numbers listed in the MIL-QPL (or eg. for Spacelab with GSFC spec.
>>> no). Most types of connectors are under these numbers available from
>>> different manufacturers, of course with different manufacturer in house
>>> part numbers. Attention: the 'same' connectors may be bought w/o the
>>> Mil.-spec. sheets with somewhat lesser quality. Important details are
>>> the max. mating number, the contact resistance (e.g. 20 mOhm) and the
>>> max. continuous current, max. Voltage, vibration resistance and
>>> reliability etc.  Of course, this makes good connectors somewhat
>>> 'expensive'. Hirel and non-magnetic gold plated D- subminiture type
>>> connectors do survive e.g. the rocket launch phase (high vibrations),
>>> vacuum and low temperatures and are still used for space projects.
>>> 
>>> The D-sub series of connectors was introduced by Cannon in 1952. They
>>> are still available as standard, hirel, and non-magnetic versions. The
>>> contacts were machined contacts forcrimping or soldering connection and
>>> made of massive copper with gold finish. (more see e.g.
>>> https://en.wikipedia.org/wiki/D-subminiature). Example for the standard
>>> 9 pin connector designation (crimp): DEMAM-9S and DEMAM-9P. Today are a
>>> big number of companies producing equivalent types. Cheap ones are
>>> equipped with contacts made of sheetmetal. Nobody should expect then the
>>> same spec. values as reliability, mating numbers, contact power rating etc.
>>> It is up to the designer of a product to be informed and select the
>>> right quality device for his product ...
>>> 
>>> I hope I could enlight a bit the connector selection and nomenclature point.
>>> 
>>> regards, 73
>>> 
>>> Arnold, DK2WT
>>> 
>>> 
>>> 
>>> Am 22.06.2017 um 21:10 schrieb Magnus Danielson:
>>>> Hi,
>>>> 
>>>> The second connect has been called "Cannon" and XLR, and is not
>>>> generally recogniced as XLR, which is the product range name.
>>>> 
>>>> Naming of the first connector as "Cannon" is at least for me and many
>>>> others confusing. This is a good example how vendor name for a
>>>> connector type is not a good thing. The first connector is a circular
>>>> MIL-STD connector (don't remember the correct notation), and this is a
>>>> product available from ITT Cannon as well as AMP.
>>>> 
>>>> Cheers,
>>>> Magnus
>>>> 
>>>> On 06/22/2017 08:42 PM, Mark Spencer wrote:
>>>>> Sorry if I have caused any un due confusion thru my perhaps incorrect
>>>>> use of the terms "cannon" and "XLR."
>>>>> The green connector with 4 separate female contacts is what I
>>>>> perhaps in correctly referred to as a "cannon" connector.  The silver
>>>>> connector with 3 separate female contacts was what I perhaps
>>>>> incorrectly referred to as a "XLR" connector.
>>>>> 
>>>>> Both were in use in my lab powering time nuts gear.
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> Mark Spencer
>>>>> 
>>>>> mark at alignedsolutions.com
>>>>> 
>>>>> 
>>>>> 
>>>>> _______________________________________________
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>>>>> 
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