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dougshep
Joined: 22 Jul 2010
Posts: 7
Location: Santa Barbara, CA
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 Posted: Thu Apr 07, 2011 5:54 pm Post subject: Contactors |
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What are the disadvantages in using the B&C S701-1Continuous Duty Contactor in place of the S702-1intermittant duty starter contactor, in a engine start application?
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_________________
Doug Shepard, RV-9A |
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retasker(at)optonline.net
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| Posted: Thu Apr 07, 2011 7:42 pm Post subject: Contactors |
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Unless I am mistaken the S701 can CARRY the starting current but is not
designed to make or break (close or open) with the high starting
current. The S702 is specifically designed to make or break with the
high starting current.
Dick Tasker
dougshep(at)netzero.com wrote:
| Quote: |
What are the disadvantages in using the B&C S701-1Continuous Duty Contactor in place of the S702-1intermittant duty starter contactor, in a engine start application?
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Flydad57(at)neo.rr.com
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| Posted: Thu Apr 07, 2011 8:03 pm Post subject: Contactors |
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Cost.
Bob Taylor
TigerCub N657RT
--------------------------------------------------
From: <dougshep(at)netzero.com>
Sent: Thursday, April 07, 2011 9:47 PM
To: <aeroelectric-list(at)matronics.com>
Subject: Contactors
| Quote: |
<dougshep(at)netzero.com>
What are the disadvantages in using the B&C S701-1Continuous Duty
Contactor in place of the S702-1intermittant duty starter contactor, in a
engine start application?
|
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nuckolls.bob(at)aeroelect
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| Posted: Fri Apr 08, 2011 7:51 am Post subject: Contactors |
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At 11:38 PM 4/7/2011, you wrote:
| Quote: |
<retasker(at)optonline.net>
Unless I am mistaken the S701 can CARRY the starting current but is
not designed to make or break (close or open) with the high starting
current. The S702 is specifically designed to make or break with
the high starting current.
|
Right on . . . The S701 draws just under 1A of
current, is designed for continuous duty operations
and is rated to SWITCH only 70A. It has relatively
large area, lower pressure contacts.
http://www.aeroelectric.com/Pictures/Contactors/S701-1b.jpg
The S702 draws 3-5A, gets destructively hot if you
leave it on too long and is rated to SWITCH hundreds
of amps. It features low area, high pressure contacts
http://www.aeroelectric.com/Pictures/Contactors/S702-1a.jpg
They are entirely different breeds of cat crafted
for specific applications.
Having said all that, know that a contactor, relay or
switch that is CONTROLLING currents many times the rated
value WILL perform to some level. In fact, you may
well achieve 'satisfactory performance' from an S701-style
contactor in a starter control application. It's service
life would be reduced to maybe 1-10% of rated . . . but
if that number is still 500-1000 cranking events . . .
how might it matter to you?
Bottom line is that using the S701 in this manner is
simply not the-best-we-know-how-to-do with components
having similar costs. Further, it is not a recipe for
disaster or even severe spikes in cost-of-ownership. So
if you're willing to experiment, then let us know how
it works out.
Bob . . .
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retasker(at)optonline.net
Guest
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| Posted: Fri Apr 08, 2011 9:03 am Post subject: Contactors |
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While I have no experience using one as a starter contactor, I think I
might be concerned that the S701 contacts could end up welded together
if the return spring is not heavy enough (depending on the particular
starter and engine combination).
Dick Tasker
Robert L. Nuckolls, III wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 11:38 PM 4/7/2011, you wrote:
>
> <retasker(at)optonline.net>
>
> Unless I am mistaken the S701 can CARRY the starting current but is
> not designed to make or break (close or open) with the high starting
> current. The S702 is specifically designed to make or break with the
> high starting current.
Right on . . . The S701 draws just under 1A of
current, is designed for continuous duty operations
and is rated to SWITCH only 70A. It has relatively
large area, lower pressure contacts.
http://www.aeroelectric.com/Pictures/Contactors/S701-1b.jpg
The S702 draws 3-5A, gets destructively hot if you
leave it on too long and is rated to SWITCH hundreds
of amps. It features low area, high pressure contacts
http://www.aeroelectric.com/Pictures/Contactors/S702-1a.jpg
They are entirely different breeds of cat crafted
for specific applications.
Having said all that, know that a contactor, relay or
switch that is CONTROLLING currents many times the rated
value WILL perform to some level. In fact, you may
well achieve 'satisfactory performance' from an S701-style
contactor in a starter control application. It's service
life would be reduced to maybe 1-10% of rated . . . but
if that number is still 500-1000 cranking events . . .
how might it matter to you?
Bottom line is that using the S701 in this manner is
simply not the-best-we-know-how-to-do with components
having similar costs. Further, it is not a recipe for
disaster or even severe spikes in cost-of-ownership. So
if you're willing to experiment, then let us know how
it works out.
Bob . . .
|
--
Please Note:
No trees were destroyed in the sending of this message. We do concede, however,
that a significant number of electrons may have been temporarily inconvenienced.
--
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Fri Apr 08, 2011 9:51 am Post subject: Contactors |
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At 12:58 PM 4/8/2011, you wrote:
| Quote: |
<retasker(at)optonline.net>
While I have no experience using one as a starter contactor, I think
I might be concerned that the S701 contacts could end up welded
together if the return spring is not heavy enough (depending on the
particular starter and engine combination).
|
A perceptive concern sir!
Bob . . .
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robertdufresne(at)videotr
Guest
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| Posted: Mon Apr 18, 2011 5:07 am Post subject: Contactors |
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test
-----Message d'origine-----
De : owner-aeroelectric-list-server(at)matronics.com
[mailto:owner-aeroelectric-list-server(at)matronics.com] De la part de Robert
L. Nuckolls, III
Envoyé : 8 avril 2011 10:46
À : aeroelectric-list(at)matronics.com
Objet : Re: Contactors
<nuckolls.bob(at)aeroelectric.com>
At 11:38 PM 4/7/2011, you wrote:
| Quote: |
<retasker(at)optonline.net>
Unless I am mistaken the S701 can CARRY the starting current but is
not designed to make or break (close or open) with the high starting
current. The S702 is specifically designed to make or break with
the high starting current.
|
Right on . . . The S701 draws just under 1A of
current, is designed for continuous duty operations
and is rated to SWITCH only 70A. It has relatively
large area, lower pressure contacts.
http://www.aeroelectric.com/Pictures/Contactors/S701-1b.jpg
The S702 draws 3-5A, gets destructively hot if you
leave it on too long and is rated to SWITCH hundreds
of amps. It features low area, high pressure contacts
http://www.aeroelectric.com/Pictures/Contactors/S702-1a.jpg
They are entirely different breeds of cat crafted
for specific applications.
Having said all that, know that a contactor, relay or
switch that is CONTROLLING currents many times the rated
value WILL perform to some level. In fact, you may
well achieve 'satisfactory performance' from an S701-style
contactor in a starter control application. It's service
life would be reduced to maybe 1-10% of rated . . . but
if that number is still 500-1000 cranking events . . .
how might it matter to you?
Bottom line is that using the S701 in this manner is
simply not the-best-we-know-how-to-do with components
having similar costs. Further, it is not a recipe for
disaster or even severe spikes in cost-of-ownership. So
if you're willing to experiment, then let us know how
it works out.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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