Atlas O dwarf signal will not switch to Green

Atlas is aware of this. Contact Steve Horvath (Atlas).  Apparently the Atlas snap switch motors have different resistances, which effects the Dwarf signal when coupled to the switch motor.  I believe correction involves replacing the switch motor.  I have  three of twenty installed that work as you described.

Mike  

Thanks Mike!  I was going out of my mind trying to solve the problem.

I just wanted to know how do you like the dwarf signals? I am thinking about buying some so that I can see how the switch in thrown from a distance. They look easy enough to install or are they? Any comments besides your problem you just talked about? Thanks, MilwRdPaul

Atlas dwarf signal install diagram.  I installed the boards below the table in the location of the switch.  The light plugs into the board. Supply power to the board (6 to 22 VAC or DC). This terminal is duplicated allowing daisy chain power to all dwarf light power boards.  Add the connection to the switch motor from the J4 terminal, through and out terminals. It should work. Green through, Red out. You may have to reverse the wires on the switch motor terminal or the J4 terminal to get the Red and Green correct.  The other problem requires a switch motor change already mentioned. Contact Atlas. 

These lights can also be used as a direct plug-in to the 6924 relay board. Check both wiring instructions before doing this.

I added these small bases fabricated from medium density particle board.  I did not use the optional Block Signal Control Board Connections.



Dwarf light boards installed under the layout. The Dwarf light has a pre-wired with plug tail that connects to the power supply board. 

I tried to use these signals with Atlas switches about 4 years ago right after they were introduced.  Per Steve's suggestion, I acquired newer switch machines that should have functioned but the results were never satisfactory.  I now use the Atlas snap relay which allows me to use any signal I want.  I found the combined cost of the snap relay and less costly MTH signals seldom added much to the total costs and were virtually 100% reliable.

The other problem I found with the Atlas signal is the size of the base does not cover the large size hole you must drill through the table top to route connector through.  Mike CT has found a way around the problem but once again, more time and effort required.

Good luck and happy railroading,

Don