SSM-LE Series
Operations Manual
Eberle Design Inc.
Page 11
- WARNING -
EDI does not provide any guidelines, warrants, or recommendations for the use of
protected/permissive left-turn phasing. The underlying assumption is that the traffic
engineer has decided that this form of protected/permissive control is the most
appropriate left-turn treatment, and all necessary considerations have been made.
Until official rulemaking action by the MUTCD has occurred, the operation and
functional parameters of the SSM-LE Series
FYA and FYAc modes are subject to
change.
Two cabinet configurations are supported depending on the number of load switches
provided and the capabilities of the Controller Unit. A Flashing Yellow Arrow approach is
actually monitored using two physical channels of the SSM-LE Series. In the basic FYA
mode of the unit, one additional load switch is required for each FYA approach to be
monitored. Thus a cabinet providing four vehicle phases, four pedestrian phases, and four
FYA approaches would require sixteen load switches.
The compact FYAc mode requires the Controller Unit to remap the Yellow outputs of the
pedestrian load switches to drive the protected Green Arrow signals of the FYA
approaches. In this mode the cabinet can provide the four FYA approaches with an existing
twelve position back panel. Configuration settings are described in Section 5.4.8.
3.11.1 BASIC FYA MODE
The cabinet must be wired such that for each FYA approach, the solid Green protected
Arrow is driven by a load switch monitored on channels 1, 3, 5, and 7. The associated solid
Red Arrow, solid Yellow Arrow, and flashing Yellow Arrow (FYA Overlap phase) must be
driven by a load switch monitored on channels 9, 10, 11, 12 respectively. The SSM-LE
Series associates channel 1 with 9, channel 3 with 10, channel 5 with 11, and channel 7
with 12 when FYA monitoring is enabled for that respective approach.
If a channel pair is enabled for FYA operation, the SSM-LE Series will monitor the FYA
logical channel pair for the following fault conditions:
a.
Conflict
i. Channel conflicts are detected based on the Permissive programming
jumpers on the Program Card for each channel. This operation
remains unchanged from normal Nema operation.
b.
Red Fail
i. A Red Fail fault will occur if the solid Red Arrow AND solid Yellow
Arrow AND flashing Yellow Arrow AND solid Green Arrow all remain
inactive for the Red Fail fault response time. The fault icon (
) will be
displayed for both channels of the pair. The Red and Yellow inputs for
channels 1, 3, 5, 7 do not affect the Red Fail condition for the FYA
channels 9, 10, 11, 12.
c.
Dual Indication
i. A Dual Indication fault will occur if any two or more of the solid Red
Arrow, solid Yellow Arrow, flashing Yellow Arrow, or solid Green Arrow
signal combinations are active simultaneously for the Dual Indication
fault response time. The fault icon (
) will be displayed for the FYA
channel 9, 10, 11, 12. The fault icon (
) will also be displayed for the
solid Green Arrow channel 1, 3, 5, 7 IF the solid Green Arrow was
active.
ii. If the Dual Indication function (SSM) is enabled for the solid Green
Arrow channels (1, 3, 5, 7) then a Dual Indication fault will occur if any
two or more of the Red, Yellow, or solid Green Arrow inputs (1, 3, 5, 7)
are active simultaneously for the Dual Indication fault response time.
d.
Clearance
i. A Clearance fault will be detected if the channel pair sequences from
the solid Green Arrow (1, 3, 5, 7) to the solid Red Arrow (9, 10, 11, 12)
