2018KCL(ip) SERIES SIGNAL MONITOR
OPERATIONS MANUAL
Eberle Design Inc.
Page 13
Yellow Arrow, and flashing Yellow Arrow is monitored on channels 1, 3, 5, and 7
respectively. The Signal Monitor associates channel 1 with 9, channel 3 with 10, channel 5
with 11, and channel 7 with 12, when FYAc monitoring is enabled for that respective
approach. See Section 4.2.9 for FYAc Mode programming.
In the FYAc mode the Signal Monitor requires that the protected Green arrow signals be
driven by the unused Ped Yellow load switch outputs. This relies on a Caltrans cabinet
wiring requirement of connecting the Ped Yellow load switch outputs to monitor channels 9
and 10 as described in section 2.19.2.2. Using this scheme allows a standard twelve
position Output File to provide the necessary signals without the addition of an Auxiliary
File.
Table 2-2
FYAC Channel Configurations
FYAC
Mode
Ch: 1
3
5
7
9
12
13
16
Protected Turn
Channels
(Ga)
Opposing
Through
Channels
Permissive Turn
Channels
(Ra, Ya, fYa)
Green Arrow Signal
Driver Source
9
2
1
13 Yellow
10
4
3
14 Yellow
11
6
5
15 Yellow
12
8
7
16 Yellow
2.19.2.1 FYAC MONITORING FUNCTIONS
If a FYA channel pair is enabled for FYAc operation, the Signal Monitor will monitor the
FYAc logical channel pair for the following fault conditions. If a channel pair is NOT enabled
for FYAc operation then the protected Green input (9-12) will be disabled (no load resistor
required).
2.19.2.1.1 CONFLICT
Channel conflicts are detected based on the Permissive programming jumpers on the
Program Card for each channel. This operation remains unchanged from normal operation
except for the solid Yellow arrow (FYA clearance) signal.
2.19.2.1.1.1 PROTECTED YELLOW CHANGE INTERVAL CONFLICT
The Signal Monitor will verify during the Yellow change interval of the Protected Turn
channel (Green arrow; channels 9,10,11,12) that no conflicting channels to the solid Yellow
arrow channel (clearance) are active. The conflicting channels are determined by the
Program Card compatibility programming of the Protected Turn channel (Green arrow;
channels 9,10,11,12) of the pair.
2.19.2.1.1.2 PERMISSIVE YELLOW CHANGE INTERVAL CONFLICT
During all other times the Signal Monitor will verify that no conflicting channels to the solid
Yellow arrow channel (clearance) are active as determined by the Program Card
compatibility programming of the Permissive Turn channel (flashing Yellow arrow;
Channels 1,3,5,7).