Model MMU-1600G Series Op Man - Ver 1.07.23 - Rev 20151026DL
Page 21 of 58
2.6.3 Flashing Yellow Arrow Monitoring
Configuration:
The Flashing Yellow Arrow (FYA) left turn configuration consists of four different settings. See Reno A&E
Application Note AN-005 for more information and detailed examples.
FYA Enable - Turning this feature ON will activate the other FYA features (FYA Childs, FYA Ignore Yellow Conflict, and
FYA Driver is Yellow) and also disables the Co-Channel features.
FYA Ignore Yellow Conflict - Turning this feature ON will force the monitor to ignore Yellow-Yellow conflicts between
the parent FYA channel and any conflicting child channel.
FYA Driver is Yellow - Turning this feature ON tells the monitor that the flashing yellow arrow display is driven by a
yellow output. When this feature is OFF, the monitor assumes that the display is driven by a green output.
FYA Childs - When a child channel is selected, the monitor will determine if the child is permissive or conflicting with the
parent channel based on the Program Card. If permissive, the child will have a “G” (Green) indication or a “Y” (Yellow)
indication based on the setting of FYA Driver is Yellow. If conflicting, the child will have an “R” (Red) indication.
The testing defaults for this feature are FYA Enable disabled, FYA Ignore Yellow Conflict disabled, FYA Driver is Yellow
set to no, and all FYA Childs disabled.
Tests Modified:
Conflict
: Normal conflict testing checks active Green, Walk, and Yellow displays for being permissive. With FYA Enable
set to yes and FYA Ignore Yellow Conflict set to yes, the monitor will ignore a Yellow-Yellow conflict between a channel
yellow and its conflicting child yellow (channel marked with an “R”) when the Yellow of the parent channel is terminating a
flashing Yellow arrow. With FYA Enable set to yes, any channel with a setting of “G” or “Y” for a child channel will have
the appropriate display (Green or Yellow) of the child channel monitored for a flashing condition. A flashing input is defined
as an input that stays ON for at least 200 milliseconds and no longer than 600 milliseconds and is OFF for at least 200
milliseconds and no longer than 600 milliseconds. If the input does not flash (stays on solid) the monitor will create a
conflict with the conflicting child (channel marked with an “R”) even though the two channels are usually jumpered as
permissive. Also, when Flashing Yellow Arrow (FYA) is enabled and Per Channel Red Enables is enabled and the channel
Red Enable is disabled and Dual Indication / Field Check for the channel is disabled and Minimum Yellow Change Disable
for the channel is not jumpered on the Program Card and the channel has the actual flashing yellow arrow display the monitor
will ignore the unused Green or Yellow of that channel for conflict tests.
Red Fail
: Normal red fail testing ensures that at least one display is active for a channel. With this feature active, any channel
with a setting of “G” or “Y” for a child channel will have the appropriate display (Green or Yellow) of the child channel
included when checking for a red fail.
Dual Indication
: Normal dual indication testing ensures that only one display for a channel is active at a time. With FYA
Enable set to yes, any channel with a setting of “G” or “Y” for a child channel will have the appropriate display (Green or
Yellow) of the child channel included when checking for a dual indication.
Short Yellow Monitoring
: When Flashing Yellow Arrow (FYA) Left Turns are enabled and a channel has an FYA setting
with a setting of “G” or “Y” for one of its child channels, then the Yellow of the channel will be used for terminating the
Yellow or Green of the child channel and will be checked for short yellow and skipped yellow. Also, when Flashing Yellow
Arrow (FYA) is enabled and Per Channel Red Enables is enabled and the channel Red Enable is disabled and Dual Indication
/ Field Check for the channel is disabled and Minimum Yellow Change Disable for the channel is not jumpered on the
Program Card and the channel has the actual flashing yellow arrow display the monitor will not include the unused Green or
Yellow of that channel in the short yellow tests.
Short Clearance Monitoring
: When Flashing Yellow Arrow (FYA) Left Turns are enabled and a channel has an FYA setting
with a setting of “G” or “Y” for one of its child channels, then that child will be checked for short clearance. Also, when
Flashing Yellow Arrow (FYA) is enabled and Per Channel Red Enables is enabled and the channel Red Enable is disabled
and Dual Indication / Field Check for the channel is disabled and Minimum Yellow Change Disable for the channel is not
jumpered on the Program Card and the channel has the actual flashing yellow arrow display the monitor will not include the
unused Green or Yellow of that channel in the short clearance tests.
Typical Use
: The intended field wiring connections for this feature are the Red, Yellow, and Green arrows connected to the
same channel and the flashing Yellow arrow connected to the Green or Yellow of another channel. If channel 1 is the
protected left turn and will have a FYA display driven by the channel 9 green and the yellow of channel 1 will be ON at the
same time as the yellow of channel 2 to terminate a flashing yellow arrow, the configuration would be: FYA Enable should
be ON, Channel 1 will have childs of channel 2 and channel 9, FYA Driver is Yellow should be OFF, and FYA Ignore
Yellow Conflict should be ON.
Care should be taken to insure that the possible phase sequencing does not allow the flashing Yellow arrow to terminate
while its opposing through is still green. Be sure to check pre-emption sequencing as well.
