nuckolls.bob(at)aeroelect
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 Posted: Wed Apr 30, 2014 10:43 am Post subject: Battery and master contactor - ok to mount horizontally? |
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At 11:44 AM 4/30/2014, you wrote:
Mounting position is definitely a consideration with some contactors.
There are units that are designed for horizontal mounting, or are
position insensitive, but there are others that are not. The Series
70 White-Rogers units, that have been very commonly used in aircraft
for decades are position sensitive. Here is a link to some info:
http://www.emersonclimate.com/Documents/White-Rodgers/sell_sheets/R-4003web.pdf
This literature recommends dome, or cap, down. Depending on whether
the unit is used as a master or start "solenoid", some
recommend mounting dome up These solenoid/contactors will seem to
work OK either way, but there is more potential wear
and possibility of binding or improper operation if they are operated
horizontally.
We've had some discussion about both alleged
and demonstrated position sensitivity of these
contactors here on the List . . . here is but
one of several dialogs . . .
http://tinyurl.com/p8uv67n
In other discussions we deduced that the W/R
Type 70 is not well suited to starter contactor
service even in the intermittent version. There
are similarly priced contactors optimized for
starter contactor service.
http://tinyurl.com/n9sql7g
http://tinyurl.com/o5turon
As a battery contactor mounted in a location
certain to be 'drip free', a horizontal mounting
doesn't give rise to great concerns. In any
case, concerns for in-flight g-loading of contactors
has no demonstrable foundation in physics or practice.
Bob . . .
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