STC SmartScanIS, User Manual

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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
4.7.1 Ground Lug
In order for the Surge Protection Subassembly to function properly, the surge components
must be properly grounded. To do this, a solderless copper lug has been provided as a
termination point for earth ground.
4.7.2 Coaxial Arresters
On the left side of the Surge Protection Subassembly are three Joslyn coaxial lightning
arresters. At the factory, the top end of these arresters are wired to the radio and, if used, to
the 2200-750 Reader.
During installation, the customer attaches antenna cables to the bottom end of these arresters.
For SmartScanIS to work properly, the northmost or eastmost AEI antenna,
antenna1 , must
be connected to the arrester labeled Reader1 . The southmost or westmost AEI antenna,
antenna2 , must be connected to the arrester labeled Reader2 .
4.7.3 Surge Arrester for Track Circuit
Above the rightmost coaxial arrester is a three-terminal arrester, which is used to protect the
system from voltage surges from the track circuit.
4.7.4 Terminal Blocks for Incoming Track Circuit
Two DIN mounted terminal blocks are provided for the termination of track circuit wiring.
Polarity doesn't matter when connecting the wires from the track circuit.