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MMU2-1600GE series Operations Manual Rev Apr 2020 Page
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conflicting displays are detected a conflict timer is started. If the conflict goes away the conflict timer is stopped
(it is not cleared) and a non-conflict timer is started. If the conflict reappears the non-conflict timer is reset to zero
and the conflict timer continues timing from its prior value. If the conflict timer reaches 300 milliseconds or more
the monitor will latch a conflict fault. If the non-conflict timer reaches 666 milliseconds the conflict timer is reset
to zero and the conflict is ignored. The normal voltage thresholds for this test are: Reds – ON when above 70V
RMS
and OFF when below 50V
RMS
, Greens / Yellows / Walks – ON when above 25V
RMS
and OFF when below 15V
RMS
.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition (continuity between the
Normally Open and Common contacts), illuminates the
CONFLICT
indicator on the front panel, and sets the
Conflict bit (bit 65) of the Type 129 Frame to 1. The Signal Sequence log and the Prior Faults log will record this
fault.
Resetting the Fault:
The monitor remains in this fault condition until the unit is reset by the activation of the front
panel reset pushbutton or the activation of the reset input. Power loss or power interruption will not reset this fault.
The Reset log will record the resetting of this fault.
Modifying Inputs:
None
Feature Interactions:
Flashing Don’t Walk Monitoring
: When Flashing Don’t Walk Monitoring is enabled and channels have
programmed as active for this feature, a flashing red on a channel with this feature active will be included in
the displays checked for conflicts. A conflict with a flashing red must exist for 1500 milliseconds to create a
conflict fault.
Flashing Yellow Arrow Left Turns
: A Flashing Yellow Arrow (FYA) signal requires a four section head. Each
FYA signal requires two MMU channels. The channel with the protected left turn green arrow is the parent.
The channel with the FYA indication is the child.
The protected green arrow of a FYA signal will conflict per the program card settings of the parent channel.
The FYA of a FYA signal will conflict per the program card settings of the child channel. If FYA Easy
Programming is selected, the FYA channel will conflict per the program card settings of the opposing thru
channel. If the FYA stops flashing, it will be monitored as a Solid Yellow Arrow.
The Yellow Arrow of an FYA signal is monitored per the program card settings of the parent channel. If
ALLOW CONCURRENT YEL: is YES then the yellow following a FYA will not conflict with the opposing
thru yellow. If IGNORE YEL TRAP: is YES, then the Yellow of the FYA channel can be on with the
opposing thru green indication following a flashing yellow arrow.
If GREEN SOLO is selected and IGNORE UNUSED CHAN is YES, the Yellow signal of the FYA parent
channel is ignored for conflicts.
If FYA SOLO is selected, the channel must have both RED ENABLE and FIELD CHECK/DUAL
INDICATION OFF, no MYCD jumper, and is not selected as a pedestrian channel then the unused indication
(Green or Yellow) of the FYA channel is ignored for conflicts.
LED Thresholds
: When LED Thresholds is enabled the monitor senses Greens, Yellows, Reds, and Walks as
ON when their voltage is above 25V
RMS
and OFF when below 15V
RMS
for the conflict test.
2.5.2
RED FAIL MONITORING
Configuration
: All channels will be monitored for the red fail fault unless the Per Channel Red Enables feature is
enabled. When Per Channel Red Enables are enabled only channels that have been programmed as active for this
feature will be included in the displays checked for red fail. The testing defaults for this feature are Per Channel
Red Enables is disabled and all channels enabled for red fail testing.
Test Preformed
: When a channel has no displays active (Red, Yellow, Green, or Walk) a red fail timer is started.
If a display turns on for the channel the red fail timer is stopped (it is not cleared) and a non-red fail timer is
started. If the no active display condition returns the non-red fail timer is reset to zero and the red fail timer
continues timing from its prior value. If the red fail timer reaches 800 milliseconds or more the monitor will latch
a red fail fault. If the non-red fail timer reaches 300 milliseconds the red fail timer is reset to zero and the red fail
is ignored. The normal voltage thresholds for this test are: Reds – ON when above 70V
RMS
and OFF when below
50V
RMS
, Greens / Yellows / Walks – ON when above 25V
RMS
and OFF when below 15V
RMS
.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition (continuity between the
Normally Open and Common contacts), illuminates the
RED FAIL
indicator on the front panel, and sets the Red
Failure bit (bit 66) of the Type 129 Frame to 1. The Signal Sequence log and the Prior Faults log will record this
fault.
Resetting the Fault:
The monitor remains in this fault condition until the unit is reset by the activation of the front
panel reset pushbutton or the activation of the reset input. Power loss or power interruption will not reset this fault.
The Reset log will record the resetting of this fault.
