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I just received a new TIU that was on back order for months.  I replaced an old TIU (that had 3 of 4 circuits working) with the new one.  The new TIU has 2 out of 4 circuits working as follows:

- 21 Volts input to Variable IN1 and Variable OUT1 has a reading of 1-2 volts (changes over time)

- Fixed In/Out1 works

- Fixed In/Out2 works

- 21 Volts input to Variable IN2 and Variable OUT2 has a reading of 0-2 volts (changes over time)

Curious that the two fixed voltage circuits work, but the two variable circuits do not.

Is this an anomaly or has MTH's quality control suffered?

Tom Jasper

Original Post

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Did you setup both the variable channels in your remote? If not, then your TIU is acting correctly.  

Here are the instructions to set them up.

Run  jumpers between inputs for fixed 1 and variable 1, black to black, red to red. Run Outputs from variable 1 to the track. Then go into the remote and set up variable track 1. You have no voltage b/c it is not set up on variable 1. You have to tell it that. The following is from Barry and his book:

  • Setup TIU Tracks for the variable channels to allow DCS Remote control of the voltage. The is described in The DCS Companion 3rd Edition on page 130, as follows:

Creating TIU Tracks on Variable Channels

TIU Tracks are created to allow the DCS operator to vary the voltage to the tracks through the TIU's Variable Channels. TIU Tracks are created as follows:

• Press the Menu key to enter the DCS menus.

• Scroll the thumbwheel to SYSTEM and press the thumbwheel to select it.

• Scroll the thumbwheel to TRACK SETUP and press the thumbwheel to select it.

• Scroll to ADD TRACK and press the thumbwheel to select it.

• Scroll to ADD TIU TRACK and press the thumbwheel to select it.

• A list of available TIUs is displayed. Use the thumbwheel to scroll to the TIU for which a TIU Track is to be created and press the thumbwheel to select it.

• Use the thumbwheel to scroll to the Variable Channel for which the TIU Track is to be created, either Variable 1 or Variable 2, and press the thumbwheel to select it.

• Use the on-screen keyboard to enter the name of the TIU Track for that Variable Channel. Scroll the thumbwheel to each character in the name and press the thumbwheel to add the character. Press < to delete a character entered in error. Scroll to D on the bottom row, right end of the keyboard to save the track's name and be returned to the TRACK SETUP menu.

 

Chris

LVHR

Thanks everyone for your suggestions.  The TIU that I thought was defective works just fine.  It's been 5-7 years since I last set up a TIU and I had forgotten the proper steps aka "Perishable Knowledge".   For my setup, I went to the Track menu (per Chris and Barry's book) to name the two variable circuits and then to the DCS menu (which eluded me for awhile) and set each variable circuit to FIXED.  I am going to make a note inside the cover of Barry's book to document this for future reference.

Tom

 

 

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