Remotoring United PRR I1s 2-10-0 Decapod
Original Olympia Model
United Scale Models / Pacific Fast Mail PFM, '1971-run

Brass Guide

I1s-open-frame.jpg
Original open frame motor. It draws about 500 mA on the test stand. Reduction gear 1:28, 45x20x16 mm open frame motor

Prototype

PRR I1s 4300.jpg
RR I1s #4300 in its Baldwin Locomotive Works builders' photo, taken in 1922

Wikipedia I1s: Their power was undeniable, but they were not popular with the crews, for they were hard riding at all but low speeds. One author described them as the holy terror of the PRR.

#4483 is stored at the Western New York Railroad Historical Societyís work site in Hamburg, NY.

Coreless DC Motor

Coreless DC Motor

I replaced the open frame motor by a coreless DC motor (Maxon A-max22 12V/6W). Datasheet, Distrelec part number 154-22-110.

MASSBILD-A-MAX-22-110143-new.jpg

Values at Nominal Voltage 12 V

  110147 110065
Leerlaufdrehzahl 10200 min-1 11700 min-1
Leerlaufstrom 45.8 mA 32.3 mA
Nenndrehzahl 7060 /min 5430 /min
Nennmoment (max. Dauerdrehmoment) 6.96 mNm 2.39 mNm
Nennstrom (max. Dauerbelastungsstrom) 0.681 A 0.293 A
Anhaltemoment 23.7 mNm 4.76 mNm
Anlaufstrom (stall current) 2.17 A 0.519 A
Max. Wirkungsgrad 72 % 56 %
Drehmomentkonstante k 10.9 mNm/A 9.17 mNm/A

Shafts and U-Joints from NWSL

  • 2015-4 1.5 mm shaft
  • 2024-4 2.4 mm shaft
  • 483-6 U-Joint

You can get it from Old Pullman or direct from NorthWest Short Line.

483-6-web.jpg
483-6 U-Joint

Roller Test Stand Videos

Roller Test Stand Videos

Decoder Installation

Decoder Installation

BOM

  • TSU-2200 Steam-2 (2 Amp) Tsunami2 Decoder - Steam, SoundTraxx #884007
  • 28mm x 40mm Oval Speaker Gasket Kit, SoundTraxx #810139
  • Medium Oval Speaker, SoundTraxx #810078
  • Pin Header 2.54 mm (1/10") 3x2
  • Pin Socket 2.54 mm (1/10") 3x2

Docs

Soundtraxx Tsunami2 TSU-2200

Wiring

Locomotive

Color NMRA JST Pin# Loco Header Pin# Function
Red 8 1 Right Rail Pickup
Orange 7 2 Motor(+)
Gray 3 3 Motor (-)
White 5 4 Headlight
Green 9 5 FX3 (Ashpan Flicker CV 51: 23+128=151, F24)
Blue 6 6 Function Common (+12V)

Tender

Color NMRA JST Pin# Function
Black 2 Left Rail Pickup
Yellow 4 [Backup Light]
Blue 6 [Function Common (+12V)]
Purple - Speaker (+)
Purple - Speaker (-)
Blue - Current Keeper [Function Common (+12V)?]
Black - Current Keeper [Ground?]

Spare

Color NMRA JST Pin# Function
Brown 1 FX4
Green/White - FX5
Brown/White - FX6

Sound Configuration

Function CV Value Type
Sound Configuration 1 112 8 (default)
Fuel Type   +1+2, 0 Hand-shoveled Coal
Injector   +4, 0 Non-lifting
Power reverser   +8, 8 enabled
3-cylinder exhaust   +16, 0 disabled
Articulated wheel-slip   +32+64, 0 disabled
Articulated exhaust   +128, 0 disabled
Engine Exhaust Control 114 90 faster, for 4 chuffs per revolution
Whistle 120 42 PRR Round Top 3-Chime
Bell 122 15 Medium Brass 2
Exhaust Chuffs 123 4 (default, Medium 2)
Airpump 124 3 (default, cross compound 2)
Dynamo 125 2 (default, dynamo 3)
Coupler Select 126    
Poppet Valve Release Rate 200    

Motor Configuration

Function CV Value Type
Low-Speed Compensation 211 150  

Headlight

  • Cal Scale HO PRR Headlight #190-477
  • Cal Scale HO Headlight PRR Modern #190-235
  • Cal Scale HO PRR Headlight Bracket #190-478

Finished Model

Finished Model

-- Peter Schmid - 2019-07-08

Creative Commons License
This work by Peter Schmid is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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