Skip to main content

I am running two loops each on a separate variable output. Each is set up as a Track in the TIU. When I power up the TIU, both tracks in the DCS app show 22 volts. But the voltage to the tracks is zero. I have throttle the track voltage down in each track to zero and then back up again to get power to the physical tracks. Do I have something set wrong or is this the way the TIU is supposed to behave?

Thanks! 

Original Post

Well, I have settled the issue with the voltage. I now have a new problem. My outer loop is on one VAR output and the inner loop is on the second VAR. They are interconnected by two pairs of switches. When an engine crosses the switches to go from one loop to the other, the power to the estimation loop dies. Between each pair of switches is a short track section which has the cut center rail and I have removed the jumper between the two outer rails. Am I trying to do something that just isn’t possible? 

Attachments

Images (3)
  • FEB6D209-DF8C-4F03-A4AA-70E40442628E
  • 6A87188F-1694-4970-8C9F-1B316D9016FB
  • 970B5C6B-B552-43E3-89E6-3A919800099D

Connect the transformer wires that go to the black input terminals of the two TIU channels together with a jumper.  Measure the voltage between the two transformer wires that go to the red input terminals of the same channels.  You should get minimal voltage there.  If you see 25-35 volts, you have a phasing issue.  Some of the PH180 bricks were phased wrong from the factory, so it depends on the vintage of transformers you have if this is an issue.  Also, if the two transformers are plugged into different outlets that are on opposite sides of the 220V main power phases, they'll also be out of phase.  I'm presuming you were mindful of the polarized plugs.

I’m reading 37 volts between the positive connections. I’m ashamed to say that I’m not mindful of polarized plugs. The bricks are plugged into an power strip that has polarized outlets. One slot larger than the other. I made the connecting wire (from the brick to the TIU myself. There was no indication of polarity with the bricks.

John, you are a genius! All is well! I’m going to change the wiring I’my homemade connector and mark the ph180 as parity reversed! THANK YOU!

FWIW, I had one of those bricks with the reversed polarity, I just took it apart and swapped the power plug leads.  While I was in there, I replaced the troublesome fuse with an appropriately rated PTC.  Serves the same purpose, but when you remove power for a minute, it's as good as new with no screwdrivers or fuse replacements.

Belfuse 0ZRE0200FF1A

Attachments

Images (1)
  • mceclip0
Last edited by gunrunnerjohn

FWIW, I had one of those bricks with the reversed polarity, I just took it apart and swapped the power plug leads.  While I was in there, I replaced the troublesome fuse with an appropriately rated PTC.  Serves the same purpose, but when you remove power for a minute, it's as good as new with no screwdrivers or fuse replacements.

Belfuse 0ZRE0200FF1A

 I popped the rubber feet on the brick with the intention of taking the case apart. Burnt, I seemingly don’t have a screw driver that can loosen the screws to separate the case. What tool do I need?

and where can I get the fuse replacement?

Add Reply

Post
The DCS Forum is sponsored by
OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

www.ogaugerr.com
×
×
×
×
Link copied to your clipboard.
×
×