Remotoring Olympia PRR E6s 4-4-2 Atlantic
Original Olympia Model
GEM/Olympia #118, '66-run

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

Original open frame motor. It draws about 500 mA on the test stand. Reduction gear 1:28, 40x20x12 mm open frame motor

Coreless DC Motor

Coreless DC Motor

I replaced the open frame motor with a coreless DC motor (Maxon A-max16 12V/2W). Datasheet, Distrelec part number 154-22-100.

Calculation for the motor speed:

  • 80 in drivers (scale 23.4 mm)
  • max. speed 115 mph (185 km/h, 51.4 m/s, scale speed 590 mm/s, 8/s, 483/min)
  • Reduction gear 1:28, 13.500/min

MASSBILD-A-MAX-16-110061-new.jpg

Values at 12 V

    110065
Leerlaufdrehzahl 11500 min-1 11700 min-1
Leerlaufstrom 41 mA 32.3 mA
Nenndrehzahl 5460 min-1 5430
Nennmoment (max. Dauerdrehmoment) 2.34 mNm 2.39 mNm
Nennstrom (max. Dauerbelastungsstrom) 0.293 A 0.293 A
Anhaltemoment 4.78 mNm 4.76 mNm
Anlaufstrom 0.521 A 0.519 A
Max. Wirkungsgrad 52 % 56 %
Drehmomentkonstante k   9.17 mNm/A

k = (U0 - I0 Rm) / w0 = (12 - 32.3 mA 23.1) / (2 Pi (11700 / 60)) = 9.185 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

sketch-bracket.jpg
Sketch Bracket, brass 0.5 mm thick

Roller Test Stand Videos

Roller Test Stand Videos

Decoder Installation (Sound & Light)

Decoder Installation (Sound & Light)

Loco #460, ashpan F24

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
  • 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

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)

ashbin-leds.jpg
PCB with the ashpan LEDs

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 4  
Fuel Type   +1+2, 0 Hand-shoveled Coal
Injector   +4, 4 lifting
Power reverser   +8, 0 disabled
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
BEMF Cutoff 10    
PID Kp Parameter 209    
PID Ki Parameter 210    
Low-Speed Compensation 211    
BEMF Feedback Intensity 212    
Low-Speed Compensation 211    
BEMF Sample Period 213   default 15
BEMF Sample Aperture Time 214   default 15
BEMF Reference Voltage 215   6 to 25.5 V (60 .. 255)

https://sites.google.com/site/markgurries/home/decoders/decoder-motor-tuning/soundtraxx

Notes from the Internet:

  1. CV213/14: Adjusting CV213 can achieve very good low speed at the expense of full speed. You have to strike a balance but try values between 5 & 10. The default setting of 15 in both CV213/14 appears to be too high for a lot of motors. But keep CV213/14 set to the same value what ever you end up with. Setting CV214 to a value 3x CV213 will stop the motor in its tracks unless you bring the speed step way up.
  2. There is a report that using the User Defined Speed Table CV 25 defeats the BEMF tweaks you make. The idea here was to make up for the effects CV213 had on the speed range. [3]
  3. Recent test that achieve good results with CV213/14 set to 5 first. Then set CV209 (Proportional) to max 255. Then reduce CV212 (Intensity) to get it to run smooth which was about 80. Playing with CV210 (Static) did not seem to change much at slow speeds.

Mark G Notes:

  1. It seems that CV213 is the first one to set for low speed performance before doing anything else. Given the BEMF is weakest at low speeds, you need to increase the sample rate (decrease sample period or make CV213 smaller) to increase the BEMF data to obtain any chance of good BEMF performance. The question is what to set the other CVís to allow you to determine the best setting of CV213. This concept appears to be correct based on one credible internet report. Procedure: Leave all other BEMF CVís at their factory default and only adjusting CV213 and 214 down between 5 and 10 but with identical values between the two will improve performance. A value of 8 is a good place to start.
  2. Given CV213 effect on top speed, it seems that CV213 should be dynamic and may in fact be the trick used by other BEMF decoders to get extended slow speed performance. Sample period goes up as the speed step goes down. Sample period goes down and the speed step goes up. This would get you the best of both worlds.
  3. Adjustment should be done with momentum and start voltage all set to zero. [1]

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 - 2018-10-27

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

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