Rebuilding Märklin 3417, NSB 63 2770, to digital with Märklin conversion set 60901 and mfx sound module 60931
Updated 15.06.2009
Märklin 3417, NSB 63 2770
During the second world war the Germans brought several of their BR 52 to
Norway. When the war ended, the locomotives remained in Norway and was
used by NSB. This was a very valuable addition to the excisting locomotive
park, and gave NSB more time to supply new Diesel locomotives.
Decoder and speaker:
I stripped the decoder for it's rubber cover and glued it with a green
detachable stuff to a decoder holder, Märklin part number 258820. This
holder fits in the tender tub. I glued the two noise suppressors for the
motor in the bottom of the tub, under the decoder holder. The orange wire
from the decoder is soldered to a distribution pcb (Printed Circuit Board) glued
to the RH inside of the tender tub. The orange wire is distributed to the
rear lamp, the front lamp and to the connector for the interior light in the
locomotive. Also the brown ground wire has a distribution point on the pcb.
The speaker is installed where the cylinder shaped weights used to be. By cutting off most of the center divider and filing off a little bit of the speaker plastic house, it was possible to press fit the speaker house into the coal box.
The decoder functions:
f0 = front light, changing with direction
f1 = smoke generator
f2 = interior light, driver's cabin
f3 = engine driving sounds
f4 = shunting speed
f5 - f15 = other locomotive sounds
See also the downloadable excel file at the bottom of this page.
Motor:
The motor parts from the Märklin conversion sets 6090, 60901, 60921 and 60760
may be used. Basically, only the decoders are different in these sets.
In this case it doesn't matter, as an mfx sound decoder, Märklin 60931, is
used. Installation of the motor itself is very simple. After removing the
old motor, make sure that the mechanical parts are clean and work perfect.
Axels, rods and gears must rotate smoothly. If necessary, oil the moving
parts very carefully. After installing the new motor, without the brushes,
check again that it all rotates perfectly. Then install the two brushes.
The below photo also shows the orange and brown/green wire to the interior light
connector.
Front light and steam generator:
The grey wire from the decoder goes all the way forwards to the front lamp, with
an orange wire. These wires are soldered to the lamp holder. Also
the brown/red wire for function f1 goes all the way forwards, soldered to the
contact tongue for the steam generator.
Tender weights:
To keep the good running performance, I had to put the removed weights back in
the tender. I fixed them together with insulating tape and just put it on
top of the rear lamp. It is held into position by the rear wall and the
lateral divider.
Interior light in driver's cabin:
A small 28 volt T1 bulb is glued to the rear end of the driver's cabin ceiling,
indicated by the gray arrow. The wires go through a slot in the RH side of the
driver's cabin. The connector is glued to the locomotive body. A 330 Ohm
resistor is soldered to the connector, to reduce the voltage to the bulb, to
reduce the light intensity.
My setting of the decoder:
| Decoder settings, 3417 | Default | Mine | ||
|---|---|---|---|---|
| Analog settings: | ||||
| Enable analog mode | check | < | ||
| Starting voltage | 7,300 | < | ||
| Maximum voltage | 23,000 | < | ||
| Control settings : | ||||
| Swap directions | uncheck | < | ||
| Max. speed | 255 | 80 | ||
| Min. speed | 4,000 | < | ||
| Acc. time | 7,000 | 20,000 | ||
| Dec. time | 3,750 | 20,000 | ||
| Forward trim | 1,000 | < | ||
| Reverse trim | 1,000 | < | ||
| Motor settings: | ||||
| Motor PWM-frequency: | ||||
| Low frequency | uncheck | < | ||
| High frequency | check | < | ||
| Load Control | ||||
| Reference parameter | 11,300 | < | ||
| Control parameter K | 60 | < | ||
| Control parameter I | 120 | < | ||
| Control influence | 255 | < | ||
| Special options: | ||||
| Preserve direction | check | < | ||
| Persistent acceleration | uncheck | < | ||
| Persistent speed | check | < | ||
| Persistent functions | check | < | ||
| Sound settings: | ||||
| Volume | 255 | 155 | ||
| Driving Sound Rate: | ||||
| At min. speed | 1,000 | < | ||
| At max. speed | 1,512 | < | ||
| Random Sound: | ||||
| Min. gap | 30 | 15 | ||
| Max. gap | 50 | < | ||
| Braking Sound Threshold: | 14 | 18 | ||
My Märklin 3417 NSB 63 2770 functions:
| mfx 60931 |
Light | Smoke unit |
Light driver |
Drive sounds |
Shunt speed |
Flute short |
Flute long |
Bell 1 |
Bell 2 |
Bell 3 |
Air pump |
Acc/ dec |
Brake sound |
Steam release |
Coal shuffle |
Rocking grate |
Injector sound | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| front | rear | ||||||||||||||||||
| f0 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f1 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f2 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f3 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f4 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f5 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f6 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f7 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f8 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f9 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f10 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f11 | f. | off | off | ||||||||||||||||
| r. | off | off | |||||||||||||||||
| f12 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f13 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f14 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| f15 | f. | on | |||||||||||||||||
| r. | on | ||||||||||||||||||
| Stop | f. | ||||||||||||||||||
| r. | on | ||||||||||||||||||
| Drive | f. | ||||||||||||||||||
| r. | on | ||||||||||||||||||