Today I did some testing of the CS3 using its programming track output to power my outdoor layout as suggested by Jean. I was only able to use two single motor LGB locos due to the limited current, 1.5A, available at the programming track output. When both locos were running at moderate speed with lights on the current draw varied between 1.1 and 1.3 amps at 19V. Power was supplied by a 60065 PS. I operated this way for about 2 hours checking locomotive and turnout response to CS3 commands. All functioned as expected the entire time. The CS3's internal booster indicated a maximum temperature of about 47ºC .
I then switched the layout to the track power output. Within about 10 minutes of loco running the loss of control issue reared its head. I had just halted one of the locos. I attempted to restart it and it failed to move. Then, I tried turning off its lights. It did not respond, the lights remained on. I attempted to operate some turnouts. Again, none responded. The running loco continued to run even after its controller was dialed back to zero. I also noted that the booster temperature began to rise reaching a maximum of almost 59ºC before I activated STOP killing power to the layout. The indicated current output never rose above 1.5A throughout.
I immediately switched back to programming track power to check if that output was similarly affected. It was not. Everything still worked fine and responded properly to CS3 commands using programming track power.
I swapped back to the track power output a second time. The CS3 was still unable to issue commands to locos or turnouts when the layout was connected to Track Power.
I continued to swap back and forth another couple of times just to verify what I had observed.
Heb dit opgepikt
I ended using programming track power for about another hour periodically checking loco and turnout response. It was normal. Also, the booster temperature came back down below 50ºC before I quit.
Based on today's observations and the fact the the CS3 operates normally when using an external 60175 booster, I can only conclude there is a fault in the internal Track Power circuitry of my CS3. Also, overheating of the internal booster was not the cause of the fault but rather a result of the fault.