Reply to "Weak DCS signals, Failed TIU Output Drivers, and Design Solutions devloped under collaboration between AGHR and MTH"

Engineer-JoeOGR Forum Member SUPPORTING MEMBER

Ryaninspiron posted:
In general is it a sign of bad TVS diodes if each TIU (PASSIVE MODE) output channel is drawing 0.2Amps? One of main rail lines(several hundred feet long) has a 2 Amp draw with an empty track as soon as the TIUs are connected.

I believe you are actually answering (can answer) your own question. If the draw goes away with the track dis-connected, it has nothing to do with the TVS.

I believe TVS pieces fail either open or a dead short.

Stay posted. Someone will tell me I'm wrong again.

A .2 amp draw could be some shorting at switches or similar. A 2 amp draw seems more severe.

Does this draw go to different TIU channels if you move it?

If you haven't tried just the TIU to the power source, try it. Of course, if you have ignore this. It's always hard to tell at a glance who has done what.

2/25/203:08 PM

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