Fw: (ET) Traction motor current

["Randy Kanary" <rj kanarysweb com>]

----- Original Message -----
From: Randy Kanary <rj kanarysweb com>
To: Rhett T. George <rtg ee duke edu>
Sent: Wednesday, October 27, 1999 8:09 PM
Subject: Re: (ET) Traction motor current


Rhett, now, a clarification of the previous clarification.{Boy, does that
sound lame!}C.B. 1 is the 100A Klixon® thermal breaker on the outside of 
the
traction motor case. C.B, 3 lives on the inside of the field case. "He" is
not a circuit breaker in the "in the line of fire" mode. "His" job is to
react to internal motor temperatures, and cause the "RTN'® circuit to drop
out if things get too hot. It works very well ,also, as just about the time
you notice that "warm electrical equipment' smell, everything shuts
down!Since the E-20 I-5 motors are a bit more huskier than the E-15 
traction
motors, and are therefore more likely to be asked to "do the impossible",
this added protection is most welcome. Note again, that C.B. 3  reacts to
long term,low level abuse, i.e. WOT operation with the field fully
weakened.C.B. 1 opens more in response to large, comparatively quick
overcurrent situations.Hope this clears the fog I've created!Be EVing you!

RJ Kanary@ Bandi Bros. Inc. ATRA ® Member Shop
Member TRNi 1&2 Since 1998
ASE® Certified Master Auto Technician Since 1992
Member Tech Line Associates Since 1987
rj kanarysweb com




----- Original Message -----
From: Rhett T. George <rtg ee duke edu>
To: <myhomebu kanarysweb com>
Sent: Wednesday, October 27, 1999 8:43 AM
Subject: Re: (ET) Traction motor current


- RJ -

Thanks for the fine description of the set of circuit breakers on
the E-20.  You mention that C.B. 1 and C.B 3 are located on the
traction motor.  I presume that C. B. 1 is internal and C. B. 3
is the Klixon thermal switch bolted to the outside of the motor.
I'll have to look again for the wiring to C.B. 1.

Your help is much appreciated.

Rhett