Re: [CBQ] Dynamic Brakes

["John Olson" <trains28@jimsjunction.com>]

Tom,

   I figured that this would be the case, but I was not absolutely sure, and wondered if a DB signal might send a non-DB unit into a tizzy trying to figure out what was going on!

 John Olson

 Billings, Mt.

On 2/28/2020 2:56 PM, Tom Mack via Groups.Io wrote:

>       
>       On Fri, Feb 28, 2020 at 11:41 AM, John Olson wrote:
> > Since all of the Q's freight F-units (including FT's)
> >         were delivered with Dynamic Brakes and none of the GP-7's or
> >         GP-9's were- when the 'Q' spliced one or more of these GP's in
> >         the middle of a 4-unit set of F's, for extra horsepower, could
> >         the Dynamic Brakes still be used... and would it  activate on
> >         all four of the F-units?
>       Yes. Dynamic braking is controlled on MU cable pins 17 (Dynamic
>       Brake Control), 20 (Dynamic Brake Warning), 21 (Dynamic Brake
>       Interlock), and 24 (Dynamic Brake Excitation). All units with MU,
>       whether they have DB or not, should pass all MU signals through.
>       Thus a non-DB unit would not affect the DB on any other units in
>       the string.
>       
>       The problem is if you have a non-DB equipped diesel leading a
>       consist with DB equipped locomotives. In that case you disable DB
>       on the entire consist since the non-DB equipped unit does not have
>       the DB lever or wiring to control DB. Hence very seldom would a
>       railroad that counted on DB put a non-DB unit in the lead.
>        
>       -- 
>       Tom Mack
>       Cincinnati, OH
>       
>     
-- 
John Olson- owner

Jim's Junction
811B 16th St. West
Billings, Mt 59102

406-259-5354
<trains28@jimsjunction.com>
See us on FACEBOOK @ Jim's Junction
See us on GOOGLE @ Jim's Junction

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