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Having some trouble with the variable outputs on the TIU (rev L).  When running 3 large passenger trains through a single variable channel on the TIU, I can no longer seem to control the variable voltage, where it has failed in a mode where it is full voltage all the time now.  

Typically I run the  channel at 17 volts on the dcs voltage scale as displayed on the remote.

I think all three trains were pulling close to 8-9 amps.  The TIU channel was powered by a 180 watt brick, so there was a decent breaker being used with this.

i thought this was fluke so moved the connections to the other variable channel and had the same permiinent loss of control of the variable out put voltage.

I have tried resetting tiu to factory settings with no help.  Both variable channels are still able to control Dcs engines through them.

Fearful that unit may be broken now.  Originally I was using the Wi-Fi set up and to simplify the trouble shooting for this issue, went back to the dcs remote and also performed a reset to both the remote and tiu, still no success.

 Any ideas or help would be appreciated!

Thanks!

Mike

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If you're in no great rush, you can get those FETs for 10 cents each on ebay (from Asia):

https://ogrforum.ogaugerr.com/...13#81678117883279013

If you're doing component surgery, you may want to inquire with one of the tech gurus (GGG comes to mind!) about why both variable channels failed when running 8-9 Amps.  Each DCS output channel is "protected" by a 25 cent TVS.  It is known that the spikes on a track are proportional to the level of current.  I'd wonder if the TVS on your variable channels are also blown.  They would, in part, protect voltage spikes from reaching the FETs.

 

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