[PRCo] Re: Repeat...

[Boris Cefer]

"Tatra T2, four TE022 motors, power pedal to the floor......."

I hope B & B found it interesting.


----- Original Message ----- 
From: "Schneider Fred" <fwschneider at comcast.net>
To: <pittsburgh-railways at dementia.org>
Sent: Thursday, July 30, 2009 11:35 PM
Subject: [PRCo] Re: Repeat...


Was that a chart for a T2?


On Jul 30, 2009, at 3:31 PM, Boris Cefer wrote:

> It is only an informative material to give the basic idea how a PCC  
> type car
> works and details are not important, but if anyone wants to know:
>
> Tatra T2, four TE022 motors, power pedal to the floor (5th point of
> acceleration) theoretically 520 Amps, coasting, dynamic brake (full  
> service
> rate) 380 Amps theoretically. There was no way to record the speed  
> but it
> will be possible some time in the future! Right now I can say that  
> this
> record is 17 seconds long.
>
> I am pretty sure a similar drawing made from oscilloscope  
> measurements of
> 1711 would be even more interesting, particularly the phase where  
> field
> shunts come in, because the shunted field on PRCo 1700s (W) was  
> only 33% (in
> our case it is "theoretically" 55%) and the peak values would be  
> higher.
> That's why the 1600s and 1700s had overspeed relays.
>
> B
>
> ----- Original Message -----
> From: "Schneider Fred" <fwschneider at comcast.net>
> To: <pittsburgh-railways at dementia.org>
> Sent: Thursday, July 30, 2009 9:11 PM
> Subject: [PRCo] Re: Repeat...
>
>
> Boris:
> Do you have any idea what car?   What motors?   What percent of
> possible accelerating relay spring tension was applied (i.e., how
> much pedal was used)
>
> Do we know know what speeds can be applied to the corresponding
> points on the amperage curves?
>
> Also was he just touching the brake pedal or is it full dynamic brake?
>
> In answer to my original problem .... I see that if you just position
> the mouse anywhere on the drawing and click again, you get full
> resolution.   No problem.
>
> So now I can interpret the drawing ... there is a brief amperage
> spike up to about 630 amps when the car is accelerating and all four
> field shunt coils are connected.   If you are running a system like
> Chicago Transit Authority with almost 150 cars on Wentworth Avenue or
> State Street or Broadway or Clark St., you can potentially be drawing
> some real amps from the substations compared to what you used before
> the PCCs were installed even though you may now have fewer cars.
>
> Now I need to find someone locally to make a large print of it to put
> into my PCC car data file that is being moved to PTM.
>
> Fred Schneider
>
> Blind carbons to Bruce Wells and Bernie Orient.
>
>