EUD-2016026-00 Rev.2, SmartScanIS User’s Guide for Union Pacific, 14 January 2021
49
4.4.1.2 Potentiometers (R31)
Potentiometer
R31
is used to adjust the DC voltage that is present at terminal 8 on
TB1
. At
the factory, it is adjusted for a value of 12.5 VDC. Turn R31 counterclockwise to increase the
voltage. Turn it clockwise to decrease the voltage.
4.4.1.3 Status LEDs
On the edge of the Power Supply board are four status LEDs. The figure below shows the
location of the LEDs.
The table below describes what each lit LED means.
LED Name
LED
Color
Meaning When Lit
12 VDC
Green
Proper DC voltage is present at terminal 8 on
TB1
. Stays lit as
long as the system is powered up and 12 VDC is present.
24 VDC
Green
Proper DC voltage is present at terminal 4 on
TB1
. Stays lit as
long as the system is powered up and 24 VDC is present.
FAIL
Red
Proper AC voltage isn't present at terminal 10 on
TB1
. Stays lit as
long as the system is powered up, AC isn't present, and the
system is running on battery backup.
115 VAC
Green
Proper AC voltage is present at terminal 10 on
TB1
. Stays lit as
long as the system is powered up and AC is present.
4.4.1.4 Fuses (F1, F2)
There are two fuses on the Power Supply board. Both are 3AG glass-body fast-acting fuses.
The 3-amp fuse (F1) protects the 2200-205 Power Supply from excessive AC. The 10-amp
fuse (F2) protects the rest of the SmartScanIS from excessive DC.
FAIL
24 VDC
12 VDC
115 VAC
Содержание SmartScanIS
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