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question on 3rd rail (TAS equipped) on power up

T TrevizeOGR Forum Member

3rd Rail engines not starting in neutral when no TMCC signal is present?

 

- the two 3rd Rail loco's that went off the rails were parked on a roundtable leg with only 4-5 inches of track before the drop (soon to be fixed).   No kill switch on the planet is going to be fast enough to stop them.   Have you seen how fast an engine goes at 20 volts!

 

- I've done some testing under controlled (read: safe) conditions now.  These two 3rd Rail loco's will take off at full speed 100% of the time the moment power is put to the track if there is no TMCC signal.  I pulled another 3rd Rail loco out of the box and tested it too.   It does it as well.   It seems this is a possible TAS issue of not being in neutral.   Anybody else wish to test?    Put a 3rd rail loco on a very safe track and give it power.   I don't mean the traditional conventional power of on then off then forward.   I mean power off and has been off a very long time.   Then give it 20 volts and tell me what it does.   I've got three 3rd Rail loco's that all take off immediately.   I believe all 3 are using TAS.

 

I'm wondering if the situation is unique to my layout or broader across all 3rd rail TAS equipped engines. 

 

 

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CAPPilotCAPPilotOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Trevize,

 

John just gave you the answer; no one specifically mentioned this in the other post you started on this subject:  "...succeeding powerup cycles it will start in forward."  Hot Water is also very knowledgeable with TMCC.  I'd say you need to come up with a way to prevent this.

 

The way I do it is I have my Legacy base, TIU base, and all transformer power go through one wall switch (20 amp circuit).  Then the transformers go through a second power chord with its own on/off switch.  As soon as I turn on the wall switch, the Legacy base is powered.  I then turn on the transformers. If I forget to turn off the transformers at the end of a run session, no problem:  the base always comes on as soon as power is applied to the layout.  As a backup, all engines will be parked on their own track with an on/off switch (actually, an ASC).  I do this to keep the engines from being powered up all the time while running trains.

 

Ron

Last edited by CAPPilot
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