№ 9 ~ Decoder for De Motor

 Installing a Tried and True TCS KAM4-LED Decoder

with built-in Keep Alive, auto-adjusting BEMF (Back Electro-Motive Force) motor control, Quiet Drive, and built-in resistors to power LED lighting, all in a tiny-tiny package.

Alright, № 9 has been running on the layout since 2020 (and is my best runner!). But apparently I neglected to write a post about installing its decoder. I found this out while performing some maintenance on the car and researched this blog to refresh my memory about it, but it wasn't there! So- here I am to right that wrong.

Stanton Drive installed. The two pairs of current collecting wipers can be seen rubbing on the back side of the wheels. One pair is wired to a red wire and the other pair to a black wire.

Grounded. Since I run off the overhead and not 2 rail, all 4 wheels are tied together electrically by simply soldering the red and black wires to the trolley car frame. 

Connected. The orange and grey wires from the Stanton's motor are wired to the decoder. Normally I would use a micro-connector here so that the floor could be disconnected from the body of the car. But I'm not sure that doing that is worth the extra effort. So- we'll see how it goes.

Positive and Negative Power Connections. The red wire from the decoder is soldered to the trolley pole bushing in the ceiling of the car. And the black wire from the decoder is soldered directly to the body of the car that is grounded to the wheels. Back in DC days the trolley pole was the positive (+) and the track was the negative( -) . But DCC is AC so "positive and negative" no longer applies really.

Decodered. The white wire is connected to the front headlight and the yellow wire to the rear headlight and both ground to the blue wire. Those lights I did post about. But the interior lighting I just realized I also neglected to post about! So I'll do a write-up about them when I refamiliarize myself with what the heck it did with them! Then the decoder is tucked up out of the way into the clerestory ceiling and glued into place.

Operation. Between the Stanton Drive and the KAM4, № 9 is a smooth operator.

Yes sir!

A smooth operator!

Dandy

#135 ~ Decodering

Installing, Wiring, and Programing a TCS KAM4-LED Decoder.

Train Control Systems Keep Alive Decoder for LEDs.

Hot Glued the decoder to the ceiling right in the center of the car.

The wiring is pretty straight forward except that the Red wires are attached to the trolley pole bases and the Black wires to all wheels:

Red = Trolley Poles

Black = Wheels

Orange = Motor

Grey = Motor

Blue = Lighting Power Bus (positive (+) ).

White = Headlight (-)

Yellow = Rear Headlight (-)

Green = Forward Interior Lights (-)

Purple = Rear Interior Lights (-)

Programing

With the Digitrax Zephyr

Programing the new address to #135:

1. Place car on the programing track.

2. Press 'Program Mode' on the Zephyr. until display reads as 'dir'.

3. Press 'LOCO' button. Display reads 'Ad2' for addresses 1-127, press again to display 'Ad4' for addresses 128-9999.

4. Press '1' and '3' and '5'. Display will read '0135'.

5. Press 'CV-WR'. Display will blink the 'Ad#' and then '0135'.

6. Return the car to the mainline to test it.

Some CV's need to be changed.  The Green wire (forward interior lights) defaults to the Function 1 (F1) button which is fine. But the Purple wire (rear interior lights) defaults to the F2 button which is a momentary contact button normally used for locomotive whistles (the whistle sounds when the button is held down). Which means that the interior lights on car #135 only light when the button is held down. So the purple wire needs to be remapped to the F3 button instead.

Digitrax Zephyr Function buttons. 

I need to remap the Green wire (CV 35) from function button 2 (F2) to function button 3 (F3).

Even though these trolley cars are bi-directional I have designated the open section as the forward end of the car to simplify things (the open section is easier to see into so I want to put my motorman figure in that end). 

Green wire (CV 35) = Front                Purple wire (CV 36) = Rear.

To remap the button-

Program:     CV 35 V=4  (simply confirm this value since this is the default)

                      CV 36 V=16 (from the default value of 8)

Remapping CV's is easiest using JMRI Decoder Pro

Otherwise its button mashing on the Zephyr:

1. Place car on the programing track.

2. Activate 'Program Mode' on the Zephyr. Program Mode light lights up.

3. Press the 'CV' button. Display reads 'ad2' or 'ad4'.

4. Press '3' and '6'. Display reads '0036'.

5. Press the 'CV' button again. Display still reads '0036'.

6. Press '1' and '6'. Display reads the value of '0016'.

7. Press the 'CV-WR' button. Display should blink once as it writes to the decoder.

8. Return the car to the mainline to test it.

And that ought to do it!

Yes sir!

That oughta do it!

Dandy