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NMJ SKD224 Assembly Manual

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SKD224 replacement board
Assembly Manual
- Document version 0.1.6 –
© Copyright NMJ 2016
All rights reserved

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Summary of Contents for NMJ SKD224

  • Page 1 SKD224 replacement board Assembly Manual - Document version 0.1.6 – © Copyright NMJ 2016 All rights reserved...
  • Page 2 Document SKD224 replacement board Version Assembly Manual 0.1.6 Please read this manual carefully before carrying out the installation!!! Although our products are very robust, incorrect wiring may destroy the module! During the operation of the device the specified technical parameters shall always be met.

  • Page 3: Table Of Contents

    Required tools ................4 Required materials ..............4 Operation principle ..............5 Board Connections ..............7 Disassembly of the SKD224 ............ 9 Installing the replacement board ..........13 Replacement of the wheels ............ 18 Decoder settings ..............25 Programming tips ..............26 Analog operation ..............

  • Page 4: Important Information

    Assembly Manual 0.1.6 1. Important Information The manual is a guide to assemble the SKD224 replacement board and gives some decoder setting recommendations and programming tips. The replacement board is a drop in replacement for the original board situated inside the SKD locomotives chassis.

  • Page 5: Operation Principle

    1 Farad capacitor, and ensures switching to the internal power supply in case of track contact interruption. This guaranties a trouble free running of the SKD224 even if the contact with the rails is lost. The SPP is capable to power the locomotive up to 4 seconds and can run it up to 30-50 centimeters without DCC power (depending on the speed).
  • Page 6 Document SKD224 replacement board Version Assembly Manual 0.1.6 The on board decoder is full of options: is featuring a SUSI connector for optional sound module connection, contains Zero Speed and ABC Braking, with penduling (push-pull operation), has a RailCom transmitter, and is capable of driving different electrical couplers.

  • Page 7: Board Connections

    Document SKD224 replacement board Version Assembly Manual 0.1.6 5. Board Connections (the color coding is made according to NMRA standards, otherwise noted) Coupler Output Right Track Connection Motor Positive Terminal Coupler Output Coupler Coupler Common Common Lights Lights Common Common...
  • Page 8 Document SKD224 replacement board Version Assembly Manual 0.1.6 Note 1: The positive common terminal for the optional lights (brown color in the illustration) is not the same as the coupler positive common (blue in the illustration). It is forbidden to connect them together.

  • Page 9: Disassembly Of The Skd224

    SKD224 replacement board Version Assembly Manual 0.1.6 6. Disassembly of the SKD224 Remove the housing from the chassis. Press in the same time on both ends of the housing (1), and lift (pull) the housing in the upper direction (2).
  • Page 10 Document SKD224 replacement board Version Assembly Manual 0.1.6 Gently remove the housing, and place it on its side near the chassis. Do not pull it too far, since the cabin lighting has a cable connection to the chassis (2). The cabin itself also has 2 plastic pins (1), which fits in the corresponding openings in the base plate located above the chassis.
  • Page 11 Document SKD224 replacement board Version Assembly Manual 0.1.6 Disconnect the cabin lighting by removing the connector from the chassis printed circuit board. Localize the track connections (1), motor connections under the black adhesive tape and the mounting screws on the chassis of the locomotive.
  • Page 12 Document SKD224 replacement board Version Assembly Manual 0.1.6 First, unsolder the connection wires (4 in total). Remove the 2 screws (1), and lift the printed circuit board. Please note, that there are 2 mechanical centering pins in the chassis, which will guide the fit of the replacement board.

  • Page 13: Installing The Replacement Board

    Document SKD224 replacement board Version Assembly Manual 0.1.6 7. Installing the replacement board Lead the 4 connection wires thru the corresponding holes in the replacement board, and fit the board to the chassis using the mechanical centering pins. Screw the board to the chassis.
  • Page 14 Document SKD224 replacement board Version Assembly Manual 0.1.6 All the wires must be pulled back, and arranged under the printed circuit board. The motor connection wires must be arranged in such a way to not touch the flywheel. The track connection can be arranged on both sides of the chassis in the available cutouts.
  • Page 15 Document SKD224 replacement board Version Assembly Manual 0.1.6 Half of the small adhesive tape from the original board can be used to mask the side lighting of the LEDs of the central head lights. Before reassembling the housing, removal of 2 small inside walls is necessary to assure the required space for the replacement board.
  • Page 16 Document SKD224 replacement board Version Assembly Manual 0.1.6 This operation has to be performed using a cutter and a small plier. The 2 interior walls must be cut with extreme care as close as possible to the housing external wall without damaging it. After the operation, clear the debris.
  • Page 17 Document SKD224 replacement board Version Assembly Manual 0.1.6 Insert the housing over the chassis, and press down until the plastic ears fit the recesses of the chassis. The plastic ears of the cabin also have to be fitted to the base plate.

  • Page 18: Replacement Of The Wheels

    Document SKD224 replacement board Version Assembly Manual 0.1.6 8. Replacement of the wheels For the wheels/axles replacement, turn the locomotive upside down, and place it on a stable surface to avoid falling on its side. Pull the plastic ears on both sides of the base plate with a small screwdriver to release it from the chassis (1).
  • Page 19 Document SKD224 replacement board Version Assembly Manual 0.1.6 Remove the 2 original axles with the plastic toothed wheels from the chassis. The axle’s assembly keeps the current pickups pressed to the wheels, while removing them the current pickups will depart from the chassis.
  • Page 20 Document SKD224 replacement board Version Assembly Manual 0.1.6 In the illustration an exaggerated quantity of grease is applied for exemplification. Use the grease in a moderate quantity. Apply it also on the intermediary toothed wheels too. Insert the replacement axles with the brass toothed wheels. They...
  • Page 21 Document SKD224 replacement board Version Assembly Manual 0.1.6 Press the axles in down direction when they are in the correct position. Continue with the insertion of the second axle and move it to the correct position (2). Page 21 of 46...
  • Page 22 Document SKD224 replacement board Version Assembly Manual 0.1.6 Press it down, to fit perfectly in the recess. Please take extreme care about the correct positioning of the axles/wheels, since they have a major influence over the running performance of the locomotive.
  • Page 23 Document SKD224 replacement board Version Assembly Manual 0.1.6 Drop a small quantity of fine mechanical oil at each axle/chassis contact surface. Please use good quality oil, as the Roco 10906. Place the base plate over the gearbox/chassis, and press it in down direction at both sides to close it completely.
  • Page 24 Document SKD224 replacement board Version Assembly Manual 0.1.6 After the wheels/axles replacement, we recommend to drive the locomotive in both forward and reverse direction for about 20-30 minutes. A Roller Tester device can be used for this operation. Page 24 of 46...

  • Page 25: Decoder Settings

    Document SKD224 replacement board Version Assembly Manual 0.1.6 9. Decoder settings The factory default setting maps the F0 function direction dependent to the front and rear lights (FL and RL), and the F1 function to the cabin light (AUX1/Out3). front side high beam reflector...

  • Page 26: Programming Tips

    Document SKD224 replacement board Version Assembly Manual 0.1.6 10. Programming tips The SPP timeout is set by default to its maximum value 255, which results in a ~ 4 second autonomy of the decoder in case of a DCC power failure. This is useful, but has it’s withdraw: the locomotive will be uncontrollable till this time expires.
  • Page 27 Document SKD224 replacement board Version Assembly Manual 0.1.6 The stopping distance should be determined at maximum speed step. This can be done by altering the default 3 value of CV137 to 1, which means the shortest possible stop distance (this distance depends on the locomotive mechanical construction and gear box configuration).

  • Page 28: Analog Operation

    11. Analog operation The analog operation of the SKD224 replacement board is not activated by default to allow the operation of the SPP circuit. However, the activation of the DC operation can be made by altering the default CV29 value.

  • Page 29: Cv Table

    In the table below you will find the complete list of configuration variables (CVs) of the DCC decoder built in the SKD224 replacememt board. We recommend to change the default values only if you know their function. Wrong settings can have negative effect ower the performance of the locomotive, or can cause non- expected actions to the DCC commands sent by the command station.
  • Page 30 Document SKD224 replacement board Version Assembly Manual 0.1.6 Software Version (only readable) Manufactured ID/RESET (readable 78 = train-O-matic, any written value will reset the decoder to the factory default values Motor Control Algorithm, 0-8 User defined = 9 (see CV 60)
  • Page 31 Document SKD224 replacement board Version Assembly Manual 0.1.6 0-255 Analog Mode, Alternate Mode Function. Status F0f,F0r, F9-F14, Bit 0 = 0(0): F0f not active in Analog mode = 1(1): F0f active in Analog mode Bit 1 = 0(0): F0r not active in Analog mode...
  • Page 32 Document SKD224 replacement board Version Assembly Manual 0.1.6 LockID: To prevent accidental programming use unique ID number for decoders with same address (0..7) For example: 1-loco decoder, 2-sound decoder, 3-function decoder, … 192-255 Extended Address, Address High 0-255 Extended Address, Address Low...
  • Page 33 Document SKD224 replacement board Version Assembly Manual 0.1.6 = 1(32): …. by consist address Bit 6 = 0(0): F7 controlled by individual address = 1(64): …. by consist address Bit 7 = 0(0): F8 controlled by individual address = 1(255): ….
  • Page 34 Document SKD224 replacement board Version Assembly Manual 0.1.6 Bit 1 = 0 (0): Constant Braking Distance on left rail disabled = 1(2): Constant Braking Distance on left rail enabled Bit 3 = 0(0): DC Braking disabled = 1(8): DC Braking enabled...
  • Page 35 Document SKD224 replacement board Version Assembly Manual 0.1.6 Bit 5 = 0(0): one byte addressing (short addressing) = 1(64): two byte addressing (extended/long addressing) Bit 6 -Not Used Bit 7 -Not Used Error CV. If the read out value is “1”, an overcurrent event occurred since the last reset.
  • Page 36 Document SKD224 replacement board Version Assembly Manual 0.1.6 = 1(1): Out1 active on F0 backward Bit 1 = 0(0): Out2 not active on F0 backward = 1(2): Out2 active on F0 backward Bit 2 = 0(0): Out3 not active on F0 backward...
  • Page 37 Document SKD224 replacement board Version Assembly Manual 0.1.6 = 1(4): Out3 active on F1 backward Bit 3 = 0(0): Out4 not active on F1 backward = 1(8): Out4 active on F1 backward 0-255 F2 mapping Bit 0 = 0(0): Out1 not active on F2...
  • Page 38 Document SKD224 replacement board Version Assembly Manual 0.1.6 Bit 0 = 0(0): Out1 not active on F4 = 1(1): Out1 active on F4 Bit 1 = 0(0): Out2 not active on F4 = 1(2): Out2 active on F4 Bit 2 = 0(0): Out3 not active on F4...
  • Page 39 Document SKD224 replacement board Version Assembly Manual 0.1.6 Bit 2 = 0(0): Out3 not active on F6 = 1(4): Out3 active on F6 Bit 3 = 0(0): Out4 not active on F6 = 1(8): Out4 active on F6 0-255 F7 mapping...
  • Page 40 Document SKD224 replacement board Version Assembly Manual 0.1.6 0-255 F9 mapping Bit 0 = 0(0): Out1 not active on F9 = 1(1): Out1 active on F9 Bit 1 = 0(0): Out2 not active on F9 = 1(2): Out2 active on F9...
  • Page 41 Document SKD224 replacement board Version Assembly Manual 0.1.6 = 1(2): Out2 active on F11 Bit 2 = 0(0): Out3 not active on F11 = 1(4): Out3 active on F11 Bit 3 = 0(0): Out4 not active on F11 = 1(8): Out4 active on F11...
  • Page 42 Document SKD224 replacement board Version Assembly Manual 0.1.6 BEMF measurement Delay. Delay(ms)=0.75+CV Value*0.25 Bit7=0 uses 32kHz PWM (CV range 0-7) Bit7=1 uses 16kHz PWM ( CV range 128-135) 0-255 PID P constant 0-255 PID I constant 0-255 PID D constant...
  • Page 43 Document SKD224 replacement board Version Assembly Manual 0.1.6 = 1(1): continues signal with no fading on Out1 Bit 1 = 0(0): Out2 could be dimmed and faded = 1(2): continues signal with no fading on Out2 Bit 2 = 0(0): Out3 could be dimmed and faded...
  • Page 44 Document SKD224 replacement board Version Assembly Manual 0.1.6 123 255 0-255 SPP (Smart Power Pack) Timeout=16ms*Value Ex: =16ms*255=~4s 124 0 ECoupler Mode CV124 = 0, PWM Output CV124 = 1, Full Output startup + PWM Output for sustaining the coupler...
  • Page 45 Document SKD224 replacement board Version Assembly Manual 0.1.6 138 25 0-255 Brake Delay Configuration CV138= 0 means no Brake Delay. To increase breaking distance above the value configured in CV138, increase in small amounts the value of CV65, which will delay the start of the braking, resulting in a longer braking path.
  • Page 46 0.1.6 Copyright © 2016 NMJ All rights reserved The information in this document is subject to change without notice NMJ - Norsk Modelljernbane AS Ensjøveien 7, 0655 Oslo Tel: (+47) 64 84 57 30 Fax: (+47) 64 84 57 39 www.nmj.no...

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