2010ECL-NYC SERIES SIGNAL MONITOR
OPERATIONS MANUAL
Eberle Design Inc.
Page 4
Failure monitoring is disabled for all channels when the Red Enable input is not active, or the
EE input (MC Coil) is active.
2.2.2 RED INTERFACE CABLE FAULT
When inserted into the output file without the Red Interface cable assembly, the Signal
Monitor will operate as a standard 210 Signal Monitor. The Red Fail, Dual Indication, and
Clearance monitoring functions will be disabled. When the Red Cable Fault select option is
installed (see Section 4.5.4), operating without the Red Interface cable will cause the Signal
Monitor to enter the fault mode causing the Output relay contacts to close and enabling the
Stop-Time output to the controller. To indicate this fault mode the Red Fail indicator will be
illuminated with all channel indicators Off.
The cabinet should be wired such that the Red Enable input is only interrupted by the Load
Switch bus being de-energized. Red Fail preemption control to the monitor should use the
Special Function inputs #1 or #2.
2.3 GYR-DUAL INDICATION MONITORING
This monitoring function detects simultaneous indications of active Green and Yellow, Green
and Red, or Yellow and Red field signal outputs on the same channel. A GYR-Dual Indication
fault places the Signal Monitor into the fault mode causing the Output relay contacts to close
and enabling the Stop-Time output to the controller. GYR-Dual Indication Monitoring is
enabled concurrently with Clearance Monitoring on a per channel basis using the SSM
switches (see Section 4.2) and requires the controller cabinet assembly to be adapted for
Red Signal Monitoring. GYR-Dual Indication Monitoring is disabled for all channels when the
Red Enable input is not active or the EE input (MC Coil) is active.
An open or no load condition (i.e., burned-out bulb) may be detected as an active signal due
to load switch leakage current and may cause a Dual Indication fault. Dual Indication
Monitoring may also anticipate a possible Conflict in the event that a proceed signal on a
channel is constantly detected as active.
2.3.1 GY-DUAL INDICATION MONITORING
This monitoring function detects a simultaneous indication of active Green and Yellow field
signal outputs on the same channel. A GY-Dual Indication fault places the Signal Monitor
into the fault mode causing the Output relay contacts to close and enabling the Stop-Time
output to the controller. It does not require the controller cabinet assembly to be adapted for
Red Signal Monitoring, and is enabled by setting option switch SW3-4 labeled GY ENABLE
in the ON position (see Section 4.4.4). GY-Dual Indication Monitoring may be enabled
concurrently with GYR-Dual Indication Monitoring. When GY-Dual Indication Monitoring is
enabled, all channels will be individually monitored for simultaneous indications of active
Green and Yellow field signal outputs. Any channels which have been selected for GYR-Dual
Indication Monitoring will function as described above in Section 2.3.
This monitoring function is intended to accommodate Green and Yellow Dual Indication
Monitoring on a five section PPLT signal head. It is also useful if the controller cabinet
assembly is not adapted for Red Signal Monitoring as in the case of a standard 210 Signal
Monitor.
2.4 CLEARANCE (SHORT OR ABSENT YELLOW) MONITORING
This function detects the absence of a minimum period of active Yellow field signal output
during a Green to Yellow to Red sequence. Clearance (Sequence) Monitoring is enabled
concurrently with GYR-Dual Indication Monitoring on a per channel basis using the SSM
switches (see Section 4.2) and requires the controller cabinet assembly to be adapted for
Red Signal Monitoring. Clearance Monitoring is disabled for all channels when the Red
Enable input is not active or the EE input (MC Coil) is active.
