SSM-LE Series
Operations Manual
Eberle Design Inc.
Page 1
Section 1
General
1.1 DESCRIPTION
The SSM-LE series Signal Monitors consists of two models; the SSM-6LE, and SSM-12LE.
The SSM-6LE is a six channel unit and the SSM-12LE is a twelve channel unit. Both
models provide the same operational functions and features including advanced NEMA
A
plus
@
fault coverage, a full intersection liquid crystal display (LCD), comprehensive event
logging and signal sequence reporting, and true RMS voltage measuring and reporting. A
serial communications port is provided on all units that interfaces with the EDI
ECcom
Signal Monitor Communications software running on a personal computer. Where not
specified otherwise, the information in this manual will apply to both models.
The SSM-LE Series
Signal Monitor is a device used in a Traffic Controller Assembly to
accomplish the detection of, and response to improper and conflicting signals and improper
operating voltages in a Controller Assembly caused by malfunctions of the Controller Unit
(CU), load switches, or mis-wiring of the cabinet. The SSM-LE Series
also provides error
sensing of two +24Vdc cabinet supplies and the controller power supplies via +24V
MONITOR I, +24V MONITOR II, and Controller Voltage Monitor (CVM) inputs respectively.
The Eberle Design SSM-LE Series
is directly interchangeable with a standard NEMA
Signal Monitor and meets with or exceeds all specifications outlined in Section 6 (Conflict
Monitor) of the National Electrical Manufacturers Association (NEMA)
Standards
Publication TS1-1989 R2005, Traffic Control Systems
.
1.2 ADVANCED FEATURE OVERVIEW
1.2.1 LIQUID CRYSTAL STATUS AND FIELD DISPLAY
The SSM-LE Series
uses a Liquid Crystal Display (LCD) to show monitor status and two
icon based LCDs to show field signal channel and fault status. This versatile display system
provides a service technician with both detailed information regarding cabinet status and
configuration, and at the same time an easily read field signal status display showing full
intersection status.
1.2.2 RMS VOLTAGE REPORTING
Input voltages are measured using a true Root Mean Squared (RMS) technique. A
dedicated Digital Signal Processor (DSP) RMS-Engine controls the analog to digital (A/D)
hardware which samples each AC input voltage a minimum of 32 times per cycle. The
RMS-Engine then calculates the true RMS voltage value producing accurate results which
are very insensitive to changes in frequency, phase, wave shape, and distortion.
1.2.3 ECCOM SOFTWARE INTERFACE
The field proven EDI
ECcom
Signal Monitor Communications software provides a laptop
computer or system interface to all information contained in the monitor. This includes
detailed status, voltages, configuration, as well as historical event logs, and five thirty
second Signal Sequence logs.
Event logs provide a historical record of previous fault data, ac line event data, monitor
reset events, and configuration programming change events. These logs are invaluable
when analyzing fault data to diagnose cabinet equipment malfunctions.
The Signal Sequence logs provide a graphical display of the signal states of all sixteen
channels for up to thirty seconds prior to the fault trigger point at 50 millisecond resolution.
The SSM-LE Series
stores these signal records for the last five fault events.
The EDI ECcom software is available at no charge from the EDI web site at
www.EDItraffic.com
.
