EDI NSM-3E Operation Manual - Page 12

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The POWER indicator will flash at a rate of 2Hz when the AC+ line voltage goes below the

drop-out level. It will illuminate steadily when the AC+ line voltage returns above the brown-

out restore level. The indicator will extinguish when the AC+ line voltage is below

approximately 70 Vrms.

The CONFLICT indicator will be illuminated when a conflicting proceed signal fault is

detected. 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.

The RED FAIL indicator will be illuminated when an absence of signal (dark signal head) is

detected on a channel(s). 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.

If the Red Enable input is not active the RED FAIL indicator will flash once every two

seconds to indicate that Extended Monitoring functions (Red Fail, Dual Indication, and

Clearance) are disabled.

The CVM indicator will be illuminated when a Controller Voltage Monitor Fault is detected.

The Channel Status display will show the active signals for each channel at the time of the

fault.

4.1.5 24V-1, 24V-2 VOLTAGE MONITOR INDICATORS

These indicators will be illuminated if the corresponding voltage input is below the minimum

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

the time of the fault.

If the 24V INHIBIT input is active the 24V-1 and 24V-2 indicators will flash once every two

seconds to indicate that Voltage Monitor functions are disabled.

The DIAGNOSTIC indicator will illuminate when an internal monitor failure is detected. This

indicator is used to inform the service technician of a monitor hardware and/or firmware

failure.

Due to the nature of these hardware/firmware failures, other fault indicators that may be

concurrently displayed may not be valid.

The RP STATUS indicator will illuminate when the Recurrent Pulse detection function has

triggered a Conflict, Dual Indication, or Red Fail fault. See Section 2.4.

The DUAL INDICATION indicator will be illuminated when a Dual Indication fault is

detected on a channel(s). 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.

Eberle Design Inc.

NSM-3E Signal Monitor Unit

Operations Manual

Section 4

Front Panel Description

Page 8