LED Interpretation
555-233-123
7-6 Issue 4 May 2002
Attendant console LEDs
The console has two red LEDs, labeled ALM and ACK, on the left side of the dial.
The left LED lights steadily when there is a Major or Minor alarm at the switch
cabinet. The right LED lights steadily if the alarm has been successfully reported
to INADS. If the system is unable to report the alarm to INADS, the LED flashes;
signaling the attendant to call INADS and report the alarm.
Cabinet power unit LEDs
For a description of Cabinet Power Unit LEDs, refer to “AC-POWER” for
AC-Powered Systems and “DC-POWER” for DC-Powered Systems in Chapter
10, ‘‘Maintenance Object Repair Procedures’’.
Power Distribution Unit LEDs
For a description of Power Distribution LEDs, refer to “AC-POWER” for
AC-Powered Systems and “DC-POWER” for DC-Powered Systems in Chapter
10, ‘‘Maintenance Object Repair Procedures’’.
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