tiu problem no output power to track

 

take the cover off and check the internal fuses if it has them some of the older ones did not have them.

Alan

 

which version is the tiu the rev is on the bottom of the case!please show us a picture of the bottom of the case! also do you use it with a remote or only use as variable control? 

No rev. L.  It also has the serial port rs-232 at end. No usb. 

I use all 4 channels for dcs. Operation.

Take your remote press track select TIU and then check channel to make sure it is on (scroll thumbwheel) to increase voltage and not accidentally shut off or voltage lowered and also softkey will allow you to make channel variable or fixed setting.

Just to make sure we're on the same page...

 

You MUST have power on the input to a specific channel in order to have any output voltage.  Just making sure we're not expecting otherwise.

 

When you apply power to the TIU, do you see the light blink once to indicate the TIU address?  If you power the fixed #1 input, can you run DCS locomotives using the fixed #1 output?

 

I run my TIU with the variable channels configured in fixed mode.  That allows command operation normally, and they'll revert to variable if I select a track and vary the voltage.

 

What are you using for power into each of the 4 channel inputs?

 

Are your variable channels set to fixed or are you scrolling up power to them using the TRK screen on there remote?

 

Did you check all the fuses (in the TIU or external) and circuit breakers?

I put the z1000 on first, the variable 1. I had no red indicator on tiu. And no lock on light. Tried to apply power to variable 2.  Nothing.  I got a red light on fixed 1. Only.  Fixed 2 nothing.  I also got a red indicator when I plugged in the z1000 into the tiu input.  So something is working. But I'm not getting any output voltage. 

Reset tiu?  I don't have any fuses in mine that I see.  Soldered connections though on terminals.

Chris,

  Power your TIU thru the Aux and see what happens.

PCRR/Dave

I'll check the trk. Soft key on remote later and see if it's 0.  But i should still get a red light on tiu if I powered the var. 1 and var 2?  Correct?

you always get a red blinking light n the tiu on power up , should blink 1 time when first turned on.!

Alan

You always have to have power either fixed input one to power up the tiu control circuits or the aux power input! either input will power the tiu. if your using variable one or two you need power at one of those inputs.

But remember if you power fixed variable voltage 1 in you must have power also to either fixed voltage in or aux to power the tiu electronics!

Alan

you should buy barry's  book it explains everything you need to do to run DCS or variable control form your remote and has all the requirements and what to check in detail when you have a problem such as you do ,will save you a lot of time troubleshooting by using the  DCS COMPANION!

Alan

Kind of sounds like you're not  powering up the tiu . The TIU need a power supply to  turn on, operate  /function.

 

2 ways to turn it on.... power to fixed 1 or an aux power supply

 

. Nothing works unless   the tiu is powered up...Fixed 2 is a straight through connection so even though power flows through it the tiu is still  dead and there's no dcs signal. The Var channels are also dead.

Bottom line make sure the tiu is turned on by checking out the led on the top of the tiu.

nope!

I think I found my issue.  Mth. Pigtail was loose on the inputs. Wire pulled out from the plug end.  I'll find another and hope it all is fine. I'll make sure I first use the fixed 1. And see if that will light my track up. Then I hope all goes well after with startup.  I thought I changed my var. To fixed last year. But maybe I changed it to run a bump and go trolley.  Memory failing!  Lol

Chris,

 

You MUST power the TIU from either the aux power input or Fixed #1.  You will never get any output from the variable channels unless one of those two power sources is connected and active. 

Chris,

 

From page 95 of The DCS Companion 3rd Edition:

 

Providing Power to the TIU

Like any other electronic component, the TIU requires a power source. MTH designed the TIU so that it can be powered in two different ways.

 

One way is to use the track power that is present at the inputs to TIU Fixed Channel #1. This power source is

available whenever the O gauge operator is running trains on tracks connected to Fixed Channel #1.

 

Another way to power the TIU is to use a separate power supply that is plugged into the TIU's Aux. Power port. In this case, the TIU would have power all the time. Any power supply that provides between 12 and 22 volts AC or DC at 1.5 amps or greater, equipped with a compatible barrel plug, may be used.

 

If the TIU is a Rev. L (or later) that has a USB port, the TIU may alternately be powered via the USB port. However, this should only be done when using the TIU solely to update TIU or DCS Remote software. In order to perform DCS engine sound file transfers, DCS Remote backup or recovery, DCS engine operation, or activation of switch tracks or accessories connected to a TIU's AIUs, power must come from either the Aux.

Power port or Fixed Channel #1 Input.

 

When the TIU is powered through Fixed Channel #1 Input, every time the power to the tracks controlled by Fixed Channel #1 is interrupted for any reason, the TIU turns itself off. However, when the TIU is powered through the Aux. Power port, the TIU remains turned on regardless of the state of power applied to the tracks controlled by Fixed Channel #1.

 

This and a whole lot more is all in MTH’s “The DCS Companion 3rd Edition", available for purchase from many fine OGR advertisers and forum sponsors, or as an eBook or a printed book at MTH's web store!

Guns,

    This is the exact reason I advised him to power thru the Aux, it eliminates all the problems and affords immediate shut down with the E-Stop at the same time.

PCRR/Dave

Ok. Got it going fine. Dcs responded fine. Remote worked.    Fixed voltage 1.  Powered one of the engines. Went fine. Then stop...... breaker popped on my z1000.  So nothing derailed.  Pulled the engine off.  Just to see if the tiu was ok.  Plug back in.  Breaker popped.  What the? ?????????   Put power to aux.  And no breaker pop.   So I put back on fixed 1.  And breaker popped.  So now what's up???  Can run power to fixed 1.  A short?  It immediately popped when I plugged in z1000.  Ugghhh!

Can you determine whether it's a faulty tiu Fixed 1 channel or a wiring issue  with fixed 1's track.... Disconnect fixed 1 out and see if anything blows.... 

 

How many power supplies are you using and  what channels do they power including the aux power. What are they??

Chris D,

   When you powered the TIU thru the Aux, did you try running anything on the Fixed one Channel/track, it sounds like you have a bad channel or you have mis-wired that particular Fixed #1 Channel/track.

PCRR/Dave

 

Gregg, I have the tiu. Nothing hooked up to it. Apply the brick to fixed 1 and immediate blows.  So that channel has a short inside.  I can power the tiu through aux input.  Red light on the tiu.  I found a 14watt. Walwart. Output is 12vdc.  Plugged that into aux input. That powers the tiu. Is that safe to use? To power tiu?  I guess fixed 1 is blown.  I can try fixed 2 if I can use the walwart.  Correct?

Can i use this safely on the aux input to power up tiu. ? Low watts.   I wondered because there is no switching breaker on this power supply I can see.  I can power up fixed 2 then with z1000.  And then convert var 1 and var 2 to fixed. So at least I can have 3usable channels.  

Not enough juice, you should have at least an amp or more.

 

The channel 1 issue may be the TVS protection diode, they're a common failure point and easy to replace.

 

You can power Aux power with that for testing.  I would power via AUX, then use the Z-1000 brick to power Fix2 and see if that works, if so, than test VAR1 an 2.  If they all work, the TVS probably shorted on FIX1 and that can be repaired.

 

Let me add that the only way a TIU gets power is via Aux input or Fixed 1  Since several people mentioned....G

 

does the DCS companion have locations of such TVS diode?  I can fix this?  I make circuits for somethings, but I have not messed with circuit boards. 

 

Thanks

Chris

Chris,

does the DCS companion have locations of such TVS diode?

No, it does not.

 

It's a very comprehensive user guide, not a repair manual.

If you are comfortable soldering on a PCB, the TVS diode is a fairly large thru-hole device.

 

The large cylindrical component next to the red wire is the TVS.

 

 

Here are the locations of the TVS diodes in the early Rev. G TIU, I don't have a picture of the later version, and I don't feel like taking one apart.

 

 

Gentlemen,

   As usual Guns an George give the advance technical repair knowledge to one of the members, what a place.

PCRR/Dave