Aux Power Supply TIU Troubles

Is the wall wart AC or DC?  Pretty sure whatever you are putting into CH 1 (AC or DC power to the tracks) must also be used to power the Aux port.

Gary

Need some help with adding an aux power source to a TIU.  Our club decided to add a wall wart power supply to our TIU aux. power port and utilize the fixed voltage CH 1 to supply power to our layout. 

I'm not really sure what you mean,    The wall mart is just powering the tiu via the aux port , You're not also using it for a power supply to fixed 1  are you?

The pin on the aux supply  port  is common to the black  output on fixed 1.  (just the opposite of what I thought it would be)

We are only using the wall wart power supply to provide power to the aux power port of TIU.  A Z4000 provide's power through Fixed Channel 1 for a power district on the club layout.  We want to use the external supply, so if we were to have a short on Channel 1, it would not shut off the electronics in the TIU. 

I was not aware that fixed channel 1 and aux ports were commoned together.  The aux. power supply is supplying DC voltage to the TIU aux power port, while the Z4000 is providing AC voltage to channel 1.  Might this be causing the issue?

I was just going by what Barry said in his first post here about matching the voltage of the Aux Input and CH 1.  In this case DC.

https://ogrforum.com/topic/tiu-aux-powered

Lionel16 posted:

We are only using the wall wart power supply to provide power to the aux power port of TIU.  A Z4000 provide's power through Fixed Channel 1 for a power district on the club layout.  We want to use the external supply, so if we were to have a short on Channel 1, it would not shut off the electronics in the TIU. 

 

I was not aware that fixed channel 1 and aux ports were commoned together.  The aux. power supply is supplying DC voltage to the TIU aux power port, while the Z4000 is providing AC voltage to channel 1.  Might this be causing the issue?

 

You have it hooked up correctly,    There must be something else going on....

My understanding of this is the same as Gregg's above. However, I have never actually tried this on my layout. I am powering my TIU with a Z500 brick on the aux port and PH-180s on fixed 1 & fixed 2, with no problems.

Nick, I haven't experienced that problem.  Have you tried a different TIU?  Could be that the AUX jack has failed.

rtr12 posted:

My understanding of this is the same as Gregg's above. However, I have never actually tried this on my layout. I am powering my TIU with a Z500 brick on the aux port and PH-180s on fixed 1 & fixed 2, with no problems.

Ditto above except Z1000's one each for fixed 1 and 2.

One of the club members brought a spare TIU he had at home, so we tried swapping out the problematic TIU with his.  After doing so, we no longer experienced the short we were having.  Sounds like there is an issue within the TIU.  

Could be a TVS has blown???????????

RJR posted:

Could be a TVS has blown???????????

2X

Actually, it is shorted and you can cut one of the legs off the FIXED 1's  TVS. It should pass current now if that's the problem.

First, Remove Aux power and power the TIU via Fixed 1.  Is there a short?  Does Fixed one work?  IF no short and it works, the issue is the different power supplies and possibly the aux power port not disconnecting properly from the Fixed 1 input side.  G