TIU not providing power

If you have power at the input and nothing at the output, you probably did blow the fuse. There are TVS components that can clamp but you'd see a dead short.

In the future, install a single car type blade 10 amp fuse inline with the hot input between the transformer and each TIU's channel input. When it blows, it's simple to see and change out.

thanks Joe

Just got back from a trip so this is my first opportunity.

I'm not seeing the fuses.  Hopefully I'm just missing something.

I see 4 yellow 20 20amp maybe ?

I hope that's it.   I just thought they would like more like this:

Yes, the four 20 amp blade fuses are the ones in question.  Doubtless you'll find one of them is open.

Hey guys,

Been out of town so this is the first chance I've had to look at this and since I'm famous for breaking stuff I wanted to be sure I'm doing it right.

So do you  just grab one of these little yellow guys and yank or are they clipped down somehow and what am I looking for to tell if the fuse is blown?

I'll be honest I haven't messed with fuses since my 77 deville.

They should pull right up out of their slots, then just looking at the fuse, it should be apparent as to which one(s) is(are) blown.  In the close-up photo, you can see the upside-down U shaped conductor, it won't be in one piece in the blown fuse:

So get  this.  The fuses are fine.  I ran the TIU  with an mth power supply on my o layout and its fine so I'm stuck looking at the dc power supply as bad I guess.

What exactly was the DC power supply?

I run large Bridgewerks DC packs (25 and 30amp) so I have a 10 amp auto blade fuses in each of the TIU's red line ins.

I'll have to grab it and do a screenshot.  I know its an 18v DC.   Bought it from a reputable guy (rayselectrictrains)

One other question. For the inline fuse do you need two one for each line or just one for both lines?

I put one in the hot line in only. I put one in each channel. Using DC power, you can only use the 2 fixed channels. So I have 2 fuses per TIU.

I'll take a look at Ray's site for the DC power.

Engineer-Joe posted:

I put one in the hot line in only. I put one in each channel. Using DC power, you can only use the 2 fixed channels. So I have 2 fuses per TIU.

I'll take a look at Ray's site for the DC power.

Ok this is what I came up with.  Both with 10 fuses.  Will this work ok?

Sure. You only need a fuse in one of the lines (to each channel). The other just gets a wire connection. You now have 2 fuses in each channel. Won't hurt anything. Use ten amp fuses if you're wiring thru the TIU.

Your power supply is only one amp! I would suggest either a larger one, or you could use smaller fuses to protect it better.

I stated ten amps because that's the max the TIU should see. I'm not sure what that power supply is capable of in a dead short? Rated at one amp.

That 1A supply is barely enough to power the TIU, and I doubt you need to put a fuse in it.  I'd just power the aux power supply port with it.  If you add any AIU's, you'll have to consider a larger power supply.

Would you gentlemen have a power supply to recommend?   

The HO layout is only 2 trains about 6x9 separate tracks

I'm out! You're asking the wrong guy here from my standpoint. Talking to me will cost you extra! I like extra power.

I have Bridgewerks DC packs powering my G scale. I have 25 and 30 amp supplies outside for the 2 mainlines. I have a smaller one inside for G scale that's maybe 20 amps?

My O scale 2 rail runs with 4 Lionel PH180 bricks AC and a MTH Z4000 AC on the upper 3 rail loop.

I don't run HO scale. If I did, the way I like to run big, long consists, I'd have extra power. I'd figure at least 2 trains with five engines each. I'd have to figure out what each engine with smoke on draws and multiply by 12 for spare power. At that point I'd be using at least 2 channels so each pack would have around 8 amps? ( rough guesswork here)

Buy a Z-500 brick to power the TIU, it'll also power any AIU's you add later.