MMU-16LE
SmartMonitor
Operations Manual
Eberle Design Inc.
Page 3
1.2.9 FIVE SECTION ARROW SUPPRESSION PROTECTED-PERMISSIVE MOVEMENT
(PPLT5)
The MMU-16LE
SmartMonitor
®
is designed to monitor an intersection with up to four
approaches using the five section PPLT5 Arrow Suppression movement. The MMU-16LE
SmartMonitor
®
has been designed to provide the same broad fault coverage for the PPLT5
Arrow Suppression approaches as it does for conventional protected left turn phases
including Conflict, Red Fail, Dual Indication, and both Minimum Yellow and Minimum
Yellow Plus Red Clearance monitoring. Note that this mode is not intended for a basic
Protected / Permissive “doghouse” style signal approach where the Ball section is intended
for the thru vehicle phase. See section 3.12 for programming information.
1.3 GENERAL
The MMU-16LE
SmartMonitor
®
is normally configured as a 16 channel (Type 16) monitor
when operated in a TS2 type cabinet assembly. The Type 16 MMU mode is intended for
those applications in which there are three circuits per channel and the MMU channels
have been wired in a one-to-one correspondence with the load switches, as defined in
Section 5.5.3 paragraph 9 of the NEMA
Standards Publication TS2-2003 v02.06, Traffic
Controller Assemblies With NTCIP Requirements.
Each channel has the capability of
monitoring a Green (Walk), a Yellow, and a Red (Don’t Walk) field signal output at the
Terminals and Facilities field terminals.
The MMU-16LE
SmartMonitor
®
can also be configured as a 12 channel (Type 12) monitor
when operated in a NEMA TS1 type cabinet assembly. The Type 12 MMU mode is
intended to provide downward compatibility with 12 channel Conflict Monitor Units (CMU)
conforming to NEMA Traffic Control Systems Publication TS1-1989. Each channel has the
capability of monitoring a Green, a Yellow, a Red, and a Walk field signal output at the
Terminals and Facilities field terminals.
A Program Card is provided for assigning permissive channels. The MMU-16LE
SmartMonitor
®
detects the presence of conflicting Green or Yellow ( or Walk) field signal
inputs between any two or more channels not assigned to be permissive on the Program
Card. The RED ENABLE input, when activated, enables the Red Fail Monitoring functions
of the unit causing the monitor to trigger when it detects the absence of voltage on all three
(four) of the field signal inputs of a channel. It also enables the Minimum Yellow
Change/Red Clearance Monitoring function which verifies that the Yellow Change plus Red
Clearance interval between the end of an active Green signal and the beginning of the next
conflicting Green signal is proper. The monitoring circuitry is capable of detecting either full
wave or positive and negative half-wave sinusoidal field signal inputs at the specified
voltage levels.
When triggered by the detection of a fault condition which exists longer than the minimum
period defined by the NEMA
Standards Publication TS2-2003 v02.06
the MMU-16LE
SmartMonitor
®
will enter the fault mode causing the OUTPUT relay to de-energize and two
sets of contacts on the OUTPUT relay to transfer. The cabinet assembly should be wired
such that the closure of the OUTPUT relay contacts will cause an automatic switching of
the field signal outputs from normal operation to flashing operation. The MMU-16LE
SmartMonitor
®
will then display the appropriate fault status. The loss of AC LINE will not
reset the fault mode of the OUTPUT relay contacts. In the event of AC LINE loss the MMU-
16LE
SmartMonitor
®
will retain the status of all fault and channel indicators and will display
the correct fault and channel status upon restoration of AC LINE.
When operating in the Type 16 mode and connected to a TS2 Controller Unit, the MMU-
16LE
SmartMonitor
®
has the ability to exchange information in a standardized format with
the Controller Unit in real time using Port 1. Messages are defined in the TS2 Standard
which allows the Controller Unit and the MMU-16LE
SmartMonitor
®
to perform redundant
checks on each other. The Controller Unit has access to all MMU-16LE
SmartMonitor
®
information including field signal input status, permissive programming, and fault status.
This gives the Controller Unit the capability to provide a backup monitoring function and