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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
4.4.1 Power Supply Board
The Power Supply board provides filtering and regulation of the DC voltages used by the
SmartScanIS. It also provides LED indicators for the input and output voltages and a terminal
block for connections to the barrier strip and the Fuse panel. Fuses are provided on the board
for the AC input and 24-volt DC output.
The figure below shows a Power Supply board.
4.4.1.1 Potentiometer (R9)
Potentiometer
R9
is used to adjust the battery float voltage. It was factory adjusted to
28 VDC. At the site, when the voltage is not between 27.8 and 28.2, adjust R9 until a
multimeter shows 28 VDC at terminal 4 on
TB1
. You can do this by turning R9 clockwise to
increase the voltage or counterclockwise to decrease the voltage. The batteries must be
disconnected while setting the float voltage.
3-amp Fuse (F1)
Status LED
10-amp Fuse (F2)
Status LEDs
Terminal Block (TB1)
Potentiometer (R31)
Potentiometer (R9)
Summary of Contents for SmartScanIS
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