889-3809-00
Model 2018 Operations Manual Rev Apr 2020 Page
11
of 41
Test Preformed:
When a channel has a Green that turns off, a Yellow must follow it and it must stay on for at
least 2.7 seconds. When each Green turns off a 2.7 second timer is started. A Yellow must start within 1.5
seconds of the Green turning off. If the Red turns on before the Yellow, a short Yellow fault will be generated to
show that the Yellow was skipped. When a Yellow turns on for at least 100 milliseconds another 2.7 second timer
is started and must reach zero before the yellow turns off or a short Yellow fault will be generated. The normal
voltage thresholds for this test are: Reds – ON when above 70V
RMS
and OFF when below 50V
RMS
, Greens and
Yellows – ON when above 25V
RMS
and OFF when below 15V
RMS
.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition, activates the Stop Time
output, and illuminates the
YELLOW
indicator on the front panel. 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:
Red Enable
: All short Yellow testing will be disabled when this input is below 50V
RMS
and enabled
when this input is above 70V
RMS
. NOTE: The disable function will be overridden when the Multi
Indication & Short Yellow jumper is installed.
MC Coil (Relay Output, Side 2)
: All short Yellow testing will be disabled when this input is below
50V
RMS
and enabled when this input is above 70V
RMS
.
Feature Interactions:
Yellow Disable Jumpers
: When Yellow Disable is jumpered for a channel that Yellow is removed
from short Yellow testing. If the Yellow is a child of a Flashing Yellow Arrow channel, the Yellow
Disable jumper should be installed for the child channel.
LED Thresholds
: When LED Thresholds is enabled the monitor senses Greens, Yellows, and Reds as
ON when their voltage is above 70V
RMS
and OFF when below 50V
RMS
for the short Yellow test.
Flashing Yellow Arrow Left Turns
: When Flashing Yellow Arrow (FYA) Left Turns are enabled and a
Channel has an FYA setting with a green or yellow border for one of its child channels (child channel
is permissive with the parent channel), then the Yellow of the parent channel will be used for
terminating the Yellow or Green of the child channel and will be checked for short Yellow and
skipped Yellow.
Multi Indication & Short Yellow Monitoring Jumper
: When the Multi Indication & Short Yellow
jumper is installed the monitor performs the short Yellow testing regardless of the state of the Red
Enable input.
2.5.5
SHORT CLEARANCE MONITORING
Configuration:
Short clearance monitoring is performed on all channels.
Test Preformed:
When a channel has a Green that turns off, a conflicting channel cannot display a Green or
Yellow for at least 2.7 seconds. When each Green turns off a 2.7 second timer is started. If a conflicting Green or
Yellow turns on for at least 100 milliseconds the 2.7 second timer must have reached zero or a fault will be
generated. The normal voltage thresholds for this test are: Greens and Yellows – ON when above 25V
RMS
and
OFF when below 15V
RMS
.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition, activates the Stop Time
output, and illuminates the
YELLOW
indicator on the front panel. 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:
Red Enable
: All short clearance testing will be disabled when this input is below 50V
RMS
and enabled
when this input is above 70V
RMS
. NOTE: The disable function will be overridden when the Multi
Indication & Short Yellow jumper is installed.
MC Coil (Relay Output, Side 2)
: All short clearance testing will be disabled when this input is below
50V
RMS
and enabled when this input is above 70V
RMS
.
Feature Interactions:
