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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
4.4.1.5 Terminal Block TB1
The 12-position terminal block
TB1
connects the Power Supply board to terminal block
TB105
,
the Controller module, and the Surge Protection Subassembly.
DANGER
Do not touch the terminal block TB1 without the power shut off. If the power is on,
the AC voltage present on part of this block could electrocute you.
The figure below shows what is wired to each terminal.
4.4.2 Power Converter and Battery Charger
Inside the module is the power converter and battery charger, consisting of these major parts.
Transformer
Bridge rectifier
Filter capacitors
Regulators
DC-DC converter
For the needs of the AC powered system, the 2200-205 Power Supply converts the externally
supplied 120 VAC to a regulated 12 VDC and 24 VDC. The regulated 24 VDC is also used to
float charge the standby battery system. This allows continued system operation for about
100 hours when there is an interruption in the externally supplied 120 VAC.
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
Power Fail
Power Fail
Battery -
B
Ground
12 VDC
AC Hot
AC Neutral
AC Ground
Summary of Contents for SmartScanIS
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