STC SmartScanIS, Руководство пользователя

Страница: 157 / 391

EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
157
9.5 Adjusting the Track Circuit
Most SmartScanIS sites use a track circuit. If your site does, it also needs a 2200-500
Presence Detector module, which activates the SmartScanIS when a train is present at the
site. If your site is using two advance transducers instead of a track circuit, there is no
2200-500 Presence Detector.
To check the operation of the SOTC and adjust it:
1 If your site uses advance transducers , go to 9.6 Checking the Scanner Shutters .
Do the next steps only if your site uses a track circuit .
2 From the center of the gating transducer farthest from the track circuit, measure the
shortest distance you want the track circuit to pick up the presence of a train.
The distance must be at least 25 feet (4.6 meters) and no more than 150 feet
(45.7 meters). You'll next shunt the track. The track must be shunted before the blue
calibration switch on the Zepic III board (aka SOTC board) can be pressed and
calibration can begin.
Shunting a track circuit could adversely affect adjacent signal-system track circuits or
crossing warning systems. Ensure the proper protection is in place before shunting
any track.
3 At the point just measured, place a 0.06-ohm shunt across both rails.
Part of the 2150-500 SOTC Interface board appears at the front of the 2200-500
Presence Detector module. On this exposed section of the board are two connectors
and a LED. When lit, this LED indicates a received pulse from the track circuit.
4 Locate the calibration access hole on the cover of the Presence Detector module.
5 Insert a nonmetal, nonconductive stick through the hole, gently pressing and holding
down the blue calibration switch on the Zepic III board until the LED starts blinking.
CALIBRATION
ACCESS HOLE
LED