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LGB 55429 Power Storage Device:

Provided for information purposes, content subject to change as the subject matter is still at the educational and experimental stage.

Notes and observations, the LGB 55429 contains six of super caps 5F 2.7 V  =  16.2 volts.

With reference to the six resistors, their function appears to be to act as balance resistors for the six supercapacitors during charging.

Marklin advise in the documentation that the the LGB 55429 pack will run hot, and that the power storage device does not interfere with programming on a mfx device.

The LGB 55429 pack is fitted with a connector for connection to the back of the LGB 55029 decoder.

Image above from the LGB website.

What's under the heat shrink, not a great deal, 6 of 2.7 V 5F super caps, and six as yet unidentified resistors.

Two positive and two negative connections via the four wire cable connect to the socket on the back of the LGB 55029 decoder. 

The LGB 55429 has no on board control electronics, no voltage limiter for the charge voltage (16V ?), no resistor to limit the inrush current-voltage for charging up the supercapacitors, no diode for the charged supercapacitors to release their storage charge, no discharge resistor (this appears on some decoder manufacturers schematics for voltage buffers), as to whether it is actually required, the supercapacitors will discharge their held voltage down fairly quickly, once power has been removed, irrespective  of any 'load' being present, no inductor to reduce the current to assist with programming, irrelevant when used with the mfx protocol, whether some of the above are present on the LGB 55029 decoder, requires further investigating.

All control CV's are contained in  LGB 55029 decoder Firmware.

To access the control CV's, the two Index CV's require changing, from their default values.
CV 31 = 18 and CV 32 = 1 

Once completed, reading or writing the following CV's, return CV 31 = 17 and CV 32 = 0 

CV values in Red are the default values from the LGB 55029 Retrofit Decoder.

Screen shots  from the mDT3 program.

LGB 55029 decoder with the LGB 55429 supercapacitor power storage device.

The Marklin/LGB documentation references that the Marklin 60974 could be connected to the LGB 55029 decoder.

Image above from the Marklin website.
Two 1 Farad capacitors and control electronics.

Control CV's are as above  for the LGB 55029, plus the Marklin 60974 has a assigned ID 2 as a SUSI device.  
Connection  via a standard SUSI connector.