Remotoring Sunset PRR M1a 4-8-2 Mountain
Original Sunset Model
Sunset Models, Catalog HO-26A 80-run

Some pictures from the seller's website http://trainmaster.ch/

Prototype
PRR M1a.jpg
Wikimedia
Pennsylvania Railroad M1b 6755.jpg
Without boiler jacket, Wikimedia

Coreless DC Motor

Coreless DC Motor

I replaced the Canon CM22 can DC 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

Roller Test Stand Videos

Roller Test Stand Videos

Decoder Installation

Decoder Installation

Loco #6775 (#75), ashpan F24

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
  • LED white for headlight e.g. PLCC2
  • LED red for ashpan e.g. PLCC2 VLMS30J1K2-GS08
  • LED yellow for ashpan e.g. PLCC2 VLMY3000-GS08
  • 2 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)

M1a-drawbar.jpg
Locomotive drawbar with 6 pin socket, tender drawbar with 6 pin header (the pins are secured with 5 min epoxy)

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?]

M1-tender-decoder.jpg
Decoder, Speaker and CurrentKeeper installation.
M1-tender-bottom.jpg
Drawbar wiring

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 Type
Forward Direction Enable 57 1+4=5 Headlight Forward & FX3 Enable
Reverse Direction Enable 58 1+4=5 Headlight Reverse & FX3 Enable
Hyperlight Effect Select 49 15+128=143 Headlight Dyno-light & LED
Ashpan Flicker 51 23+128=151 FX3,LED F24

Motor Configuration

Function CV Value Type
Low-Speed Compensation 211 10 ?  

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 - 2018-12-03

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

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JPEGjpg M1-tender-bottom.jpg r1 manage 190.5 K 2019-08-10 - 14:27 PeterSchmid  
JPEGjpg M1-tender-decoder.jpg r1 manage 201.6 K 2019-08-10 - 14:27 PeterSchmid  
JPEGjpg M1a-drawbar.jpg r1 manage 164.6 K 2019-10-14 - 19:10 PeterSchmid  
JPEGjpg M1a-header.jpg r1 manage 41.4 K 2019-10-14 - 18:53 PeterSchmid  
JPEGjpg M1a-side.jpg r1 manage 190.9 K 2019-10-14 - 19:10 PeterSchmid  
JPEGjpg MASSBILD-A-MAX-22-110143-new.jpg r1 manage 77.5 K 2018-12-31 - 17:32 PeterSchmid  
JPEGjpg PRR_M1a.jpg r1 manage 37.4 K 2018-12-31 - 17:22 PeterSchmid  
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