STC Smartscan NG2, Руководство пользователя

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May 2021, SmartScanNG² User's Guide for Wayside Enclosure Components, EUD-2018086-00 Rev.3
2.2.9 Chassis Mounted LEDs
There is a group of six status LEDs on the lower right side of the chassis. The bottom-left LED
(SOTC) indicates train presence (when lit). The bottom-right LED indicates that power is
"ON." The middle and upper LEDs show the operation of the solid-state relays used to control
the scanner shutters and heaters.
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RELAY LEDS
The four relay LEDs can indicate problems with the relays if they fail to operate. All four of
these LEDs are green. Two of the LEDs are wired directly to the relays input terminals to
indicate when a control signal has been sent from the controller. The other two LEDs are
wired to the relay output to indicate when power is being applied to the scanner. Not all relay
LEDs can be lit at the same time. Anytime the shutters are open; the heaters should be off.
Under normal conditions, the upper two LEDs (shutters) should only be lit when the heaters
are off. Conversely, under normal conditions, the middle two LEDs (heaters) should only be lit
when the shutters are closed. In other words, when the system is working, only the upper two
LEDs are lit when a train is rolling through the site. When no train is present, only the middle
two relay LEDs may be lit.