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 with 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
  • CurrentKeeper SoundTraxx #810140
  • 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
  • 2 PCS LED white for headlight and backup light e.g. PLCC2
  • LED red for ashpan e.g. PLCC2 VLMS30J1K2-GS08
  • LED yellow for ashpan e.g. PLCC2 VLMY3000-GS08
  • 3 PCS SMD Resistor 1 kOhm 1206
  • PC-Board ROTH Elektronik RE 437
  • Magnet Wire e.g. 30 AWG from Spark Fun
  • Mounting Tape Tesa 55740
  • Clear 5 Min Epoxy for potting the headlight LED
  • Locomotive drawbar 15 x 8 x 0.5 mm, tender drawbar 10 x 8 x 0.5 mm (brass sheet)

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 11  
Fuel Type   +1+2, 3 Coal Stoker
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 58 faster, for 4 chuffs per revolution
Whistle 120 42 PRR Round Top 3-Chime
Bell 122 27 Heavy Brass (3)
Exhaust Chuffs 123 6 Heavy (1)
Airpump 124 8 Dual Cross-Compound
Dynamo 125 2 (default, dynamo 3)
Coupler Select 126 128+1=129 Heavy Coupler F13

Light Configuration

Function CV Value TypeSorted ascending
Hyperlight Effect Select 50 15+128=143 Backup Light Dyno-light & LED
Reverse Direction Enable 58 2+4=6 Backup Light Reverse & FX3 Enable
Ashpan Flicker 51 23+128=151 FX3,LED F24
Hyperlight Effect Select 49 15+128=143 Headlight Dyno-light & LED
Forward Direction Enable 57 1+4=5 Headlight Forward & FX3 Enable

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.

Topic attachments
I Attachment History Action Size Date Who Comment
JPEGjpg I1s-open-frame.jpg r1 manage 133.6 K 2019-07-09 - 18:33 PeterSchmid  
JPEGjpg PRR_I1s_4300.jpg r1 manage 35.0 K 2019-07-09 - 18:45 PeterSchmid  
Edit | Attach | Watch | Print version | History: r7 < r6 < r5 < r4 < r3 | Backlinks | Raw View | Raw edit | More topic actions
Topic revision: r7 - 2019-10-15 - PeterSchmid
 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback