EDI SSM-12LEC User Manual

SSM-LE Series
Operations Manual
Eberle Design Inc. Page 3
Standards Publication TS2-2003 v02.06, Traffic Controller Assemblies With NTCIP
Requirements).
1.4.1 LEDGUARD
®
LED FIELD SIGNAL SENSING
The Eberle Design SSM-LE Series can be configured to use a technique called LEDguard
®
that is designed to better monitor the characteristics of LED based signal loads (See
Section 5.4.2). Each field signal input is measured and compared to both a high threshold
and a low threshold value to determine On / Off status. This differs from conventional
standard NEMA operation where the active threshold is picked according to the color of the
field signal. Once the high and low On / Off thresholds (Section 7.1.2) have been
determined using the input RMS voltage, the individual fault monitor functions use the
appropriate threshold to determine if a fault condition exists.
LEDguard
®
Green/Walk
Yellow
Red/Don’t Walk
Conflict
Low
Low
---
Red Fail
High
High
High
Dual Indication
Low
Low
Low
Clearance
Low
Low
High
A paper with further information on the EDI LEDguard
®
function can be found in the
Support section of the EDI web site, www.EDItraffic.com.

EDI SSM-12LEC Specifications

General

Brand	EDI
Model	SSM-12LEC
Category	Measuring Instruments
Language	English