MMU2-16LE Series SmartMonitor
®
Malfunction Management Unit
Operations Manual
Eberle Design Inc. Page 1
Section 1
General
1.1 DESCRIPTION
The MMU2-16LE SmartMonitor
®
series Malfunction Management Unit (MMU) 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 MMU2-16LE SmartMonitor
®
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 MMU2-16LE SmartMonitor
®
is directly interchangeable with a
standard NEMA Malfunction Management Unit (MMU configuration) and meets with or
exceeds all specifications outlined in Section 4 (Malfunction Management Unit) of the
National Electrical Manufacturers Association (NEMA) Standards Publication
TS2-2016 v03.07, Traffic Controller Assemblies With NTCIP Requirements.
1.1.1 NEMA TS-2 MMU2 (FYA) CONFIGURATION
NEMA Standard TS2-2016 defines the operation of an MMU2 configuration that
supports the Flashing Yellow Arrow (FYA) operation. FYA operation was developed
under the National Cooperative Highway Research Program (NCHRP) project 3-54.
Per the MUTCD 2009 recommended guidance, the FYA signal head is a 4-section
signal face with outputs for a protected left turn (Green arrow), permissive left turn,
(flashing Yellow arrow), Yellow clearance (solid Yellow arrow), and prohibited left turn
(Red arrow). This MMU2-16LE SmartMonitor
®
series fully supports the requirements of
the NEMA MMU2 configuration. See Section 3.11.
1.2 ADVANCED FEATURE OVERVIEW
1.2.1 LIQUID CRYSTAL STATUS AND FIELD DISPLAY
The MMU2-16LE SmartMonitor
®
uses a programmable alpha-numeric Liquid Crystal
Display (LCD) to show monitor status and two icon based LCDs to show field signal
channel and fault status. This versatile back-lighted display system provides a service
technician with both detailed information regarding cabinet voltages, configuration, and
status, and at the same time an easily read field signal status display showing full
intersection status.
1.2.2 MENU DRIVEN OPERATION
The Display, Program, and Help modes of the MMU2-16LE SmartMonitor
®
are
controlled using a simple menu driven user interface. The menu provides an organized
scheme for displaying both current status as well as reviewing historical fault status. It
also provides a mechanism for setting and reviewing the monitor enhanced-feature
programming without the need for a laptop computer.
1.2.3 CONTEXT SENSITIVE HELP SYSTEM
The built-in Help system provides operational guidance as well as trouble shooting
advice to both the novice and expert technician. The front panel HELP button presents
the requested information on the main LCD depending on the display page and context
currently selected.
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