Nick-376669 Posted December 31, 2023 Share Posted December 31, 2023 I have a R410 turntable that is now DCC enabled. To connect it to my track layout do I achieve this using a point decoder R8247 or not? Link to comment Share on other sites More sharing options...
Simon-372339 Posted December 31, 2023 Share Posted December 31, 2023 How have you actually DCC enabled it? Motor added, rewired? Link to comment Share on other sites More sharing options...
P-Henny Posted December 31, 2023 Share Posted December 31, 2023 No ... use a locomotive decoder R8249. Firstly a loco decoder allows you to drive a TT in both directions. Secondly, a loco decoder allows you to control the rotation speed. Neither of these desirable features are available to you if using a R8247.I suggest you read the FAQ 3 TT DCC Conversion instructions in the 'DCC FAQ Index' pinned sticky thread. Although written for a R070 TT, the same principles will apply to the R410 TT. Which describes in detail, the best method for connecting a Hornby TT to a DCC Powered layout track. Link to comment Share on other sites More sharing options...
96RAF Posted January 1 Share Posted January 1 The R8247 is not really suitable to control the rotation of a Hornby TT as each port output is only around 150mA and driving a TT motor both ways would likely require diodes fitted in the circuit.The HM6010 module however has a dedicated 500mA output port, but the output is a set speed and in one direction only, so not that versatile.My R070 TT is converted to DCC use per the guide linked to earlier and a simple basic decoder allows the table to be driven in either direction at a variable speed of choice. Such a set up is ideal for use with train operating software such as RM or TGG, etc. Link to comment Share on other sites More sharing options...
RDS Posted January 1 Share Posted January 1 I also used an R8249 Loco Decoder on the TT that I modified Link to comment Share on other sites More sharing options...
P-Henny Posted January 1 Share Posted January 1 ........and driving a TT motor both ways would likely require diodes fitted in the circuit. I did wonder myself it that was feasible, and before posting my earlier reply sketched out a number of different diode connection configurations, using just diodes on their own. In every case, the diode circuits resulted in one of the diodes creating a path between the common C and one or other of the switched negative outputs .... result ... a 'short circuit'.However add a couple of transistors and bias resistors to the diode circuit to control switching and a feasible motor polarity reversing circuit can be built to work with a 3 wire Accessory Decoder.See circuit schematic link below:Datei:Motorweichenadapter.png - Digital ModellbahnBut this should be treated as just an academic exercise because it is just simpler, cheaper and more effective & efficient to use a loco decoder.The circuit above is actually sold as a ready made product by 'DCC Concepts' to convert 3 wire Solenoid point motors to 2 wire reversing motors.DCC Decoder Converter 3 Wire to 2 Wire (3 Pack)EDIT: The R8247 Accessory Decoder would also have to be configured with a defined pulse length as using 'Always On' would be continuously driving the TT in one direction or the other and never stop. The need for a pulse length configuration then gives the issue of how long do you make it. Again a loco decoder overcomes this issue, as it is a simple matter to stop and start the TT motor at any time that is necessary for the number of track inputs that have to be traversed. Link to comment Share on other sites More sharing options...
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