STC SmartScanIS, Руководство пользователя

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14 January 2021, SmartScanIS User’s Guide for Union Pacific, EUD-2016026-00 Rev.2
4.7.6 AC Surge Protector
Two DEHNguard Model P-150 Surge Suppressors provide AC surge protection. The Model
P-150 consists of a base with a replaceable plug-in MOV module, contacts for remote
monitoring, and a red fault indicating flag window.
Even in the event of suppressor failure, AC line voltage is still provided to the system. This
reduces the possibility of a total system shutdown. However, after a suppressor failure, you
no longer have surge protection. When running firmware version 5.01 or later, the integrity of
the Model P-150 is monitored by the system. Should the protection become compromised, the
end-user is alerted via the System Status report and the Union Pacific's Polling System.
4.7.7 AC and DC Breakers
The AC and DC breakers provide overload and short-circuit protection for the SmartScanIS.
The AC breaker protects the AC power input to the electronics enclosure. The DC breaker
protects the 24 VDC (battery) connection. These circuit breakers also provide a convenient
means to turn off power to the system. Both the AC breaker and the DC breaker must be
toggled off to power down the SmartScanIS.
4.7.8 Terminal Blocks for Incoming AC
To the right of the AC breaker, three DIN mounted terminal blocks are provided as a
termination point for incoming AC service. At the factory, a power cord is attached to these
terminal blocks.
4.7.9 Terminal Blocks for Incoming DC
To the left of the DC breaker, two DIN mounted terminal blocks are provided as a termination
point for the 24 VDC battery backup.