EDI NSM-3E Panduan Pengoperasian - Halaman 13

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4.1.9 CLEARANCE INDICATOR

The CLEARANCE indicator will be illuminated when no Yellow or a short (less than 2.7

seconds) Yellow signal is detected on a channel during a Red to Green to Yellow to Red

sequence. The Channel Status display will show the active signals for each channel at the

time of the fault and the channels involved in the fault.

When the NSM-3E is not in the fault state, the unit will continuously display the active

Green, Yellow, Walk and Red field status simultaneously on a four color LED full

intersection display.

Once the NSM-3E has been triggered by a fault, the channel status display will alternate

between the field signals active at the time of the fault for 6 seconds, and the channels

which were involved in the fault (fault status) for 2 seconds. The channels involved in the

fault will flash their respective Green, Yellow, Walk and Red indicators simultaneously at a

4 Hz rate for the 2 second fault status interval.

If the fault displayed is a Recurrent Pulse Conflict, Recurrent Pulse Dual Indication, or a

Recurrent Pulse Red Fail, the RP STATUS indicator will then flash simultaneously at a 4

Hz rate with the input(s) that had Recurrent Pulse status for an additional 2 seconds

following the fault channel display.

Depressing the Reset button resets the NSM-3E Signal Monitor after it has been triggered

by a fault. The monitor remains in the reset mode only if the fault condition has been

restored to normal. In the event of a monitor hardware or firmware fault (DIAGNOSTIC

indicator is illuminated) the Reset button may not reset the monitor.

Eberle Design Inc.

NSM-3E Signal Monitor Unit

Operations Manual

Page 9