Optional control system design.
Note: These examples are an optional approach to implementing the MTH DCS system for O scale model railroading. It is not intended as a tutorial which is best left to other references. Additional features have been designed to supplement the DCS system but are not essential to the operation when using the MTH DCS system but are merely provided as options for consideration by the reader.
This control system design uses the MTH DCS system for total control of every aspect of the layout. The system will also soon incorporate the new DCS wifi hardware and Android APP. (not available yet)
Several MTH AIUs are installed to completely control every turnout, block, signal and accessory on the layout. Individual pushbutton and toggle switch panels are also included to provide an alternate method of control which allows the operator to completely bypass the AIUs if desired.
For DCS control I have 2 TIUs each supplied by individual Z4000 transformers. The Z4000s also have external 10 amp circuit breakers and voltmeters on each channel. The TIU outputs are also individually protected by circuit breakers. The TIU AUX power is provided by an individual "Brick".
I use AIUs for control of turnouts, blocks, signals and other accessories. I also have a relay board interface which allows the use of either miniature pushbuttons or the DCS handheld to control turnouts. The AIU controls power feeds to the track via the relay board. The AIU internal relays do not conduct power to the track but merely activate a relay coil.
The photo shows only one TIU installed. The second TIU and a second AIU is used for testing of locomotives and accessories and as a backup.
For conventional operation I have a separate Lionel ZW transformer. The ZW also has individual external circuit breaker protection.
Note: I can also use the TIU variable outputs for DCS and conventional operation if necessary.
All individual track feeds to the track have individual circuit breaker protection. I have a total of 10 blocks which can be controlled by either the AIU or individual toggle switches.
All turnouts and accessories are powered by separate KW transformers which also have individual circuit breakers and fuses.
Also shown in the photo is a combination dual 10 ampere circuit breaker box and a companion dual emergency E-Stop circuit. The E-Stop circuit is used with four E-Stop buttons located around the layout. Pressing any E-Stop trips all power to the TIU input channels. The TIU is not affected.
Also NOT SHOWN is a wireless remote control disconnect that removes power from the TIU. A wireless controller de-activates the power to the emergency "trip" circuit which then cuts power to both channels of the TIU.
All wiring is completely color-coded.
All circuits are both fuse and circuit breaker protected.
NOTE:
This posting is provided for informational purposes. It is intended as an illustration of some "optional" techniques for wiring a DCS system. However it is the option of the OGR Forum reader to apply some of these techniques to their control system in any fashion they deem appropriate.
Other wiring methods may be just as appropriate.
It is my understanding that the Forum is open to anyone as long as they abide by the rules governing the Forum. As always helpful suggestions and comments are always welcome. Comments from other Forum readers are useful since the model railroading experience of others adds to the value of the hobby.