nuckolls.bob(at)aeroelect
Guest
|
 Posted: Mon May 18, 2009 10:16 am Post subject: Speaking of W-R/RBM/Stancore Contactors . . . |
 |
|
FYI . . .
I've become aware of a failure internal to a 3-terminal
White-Rogers/RBM Controls contactor that shorted the coil
stud to the contactor's floating conductor ring. This caused
the contactor to "buzz" and ultimately burned the wire between
the contactor and the battery master switch. Artifacts of
arcing are visible in:
http://aeroelectric.com/Pictures/Failures/W-R_RBM_3-Terminal_2s.jpg
The solder lug that attaches to the coil wire is oriented UP
toward the conductor ring and then formed over for clearance.
At first blush, I would suspect that this solder lug was
improperly assembled at the factory . . . it could have
been laid over 90-degrees and still provided for coil
lead termination with MUCH more clearance to the fat
copper conductor ring.
To understand the internal construction of this
product I'll refer the readers to images at:
http://www.aeroelectric.com/Pictures/Contactors/S701-1a.jpg
http://www.aeroelectric.com/Pictures/Contactors/S701-1b.jpg
http://www.aeroelectric.com/Pictures/Contactors/S701-1c.jpg
http://www.aeroelectric.com/Pictures/Contactors/S701-1d.jpg
http://www.aeroelectric.com/Pictures/Contactors/S701-1e.jpg
http://www.aeroelectric.com/Pictures/Contactors/S701-1f.jpg
These photos are for a later configuration of the 3 and 4-
terminal contactors. The tiny coil wire is not even
visible and ample clearances are maintained between coil
terminal hardware and conductor ring by a molded nylon terminal
housing.
The 'Connection (and to the best of my knowledge B&C) has
never sold contactors with the earlier terminal
configuration. The failed contactor had a date code of 9515;
15th week of 1995). Every 4-terminal device I've torn down
featured later configuration for coil terminals visible in
photos above. It's also a fair bet that older versions of
the contactor described in the failure analysis were assembled
with more attention to detail for positioning the solder
lug.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
| | - 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 |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
