CMUip-2212 Cabinet Monitor Unit
Operations Manual
Eberle Design Inc.
Page 13
simultaneously for the Dual Indication fault response time. The fault status will be displayed
for both channels of the FYA pair when the sparse channel input (Ga) is active.
If the RG, RY, or GY Dual Indication function is enabled and the RY Input option is enabled
for the sparse channel (Ga), then a Dual Indication fault will occur if any two or more of the
Red, Yellow, or Green inputs are active simultaneously on the sparse channel for the Dual
Indication fault response time. The fault status will be displayed for the sparse channel of
the FYA pair.
2.16.2.4 MINIMUM YELLOW CLEARANCE
A Yellow Clearance fault will be detected if the channel pair sequences from the protected
Green Arrow to the solid Red Arrow without a minimum clearance time on the solid Yellow
Arrow. The fault status will be displayed for the solid Yellow Arrow channel.
A Yellow Clearance fault will be detected if the channel pair sequences from the permissive
flashing Yellow Arrow to the solid Red Arrow without a minimum clearance time on the solid
Yellow Arrow. The fault status will be displayed for the solid Yellow Arrow channel.
If the Minimum Yellow Clearance function is enabled and the RY Input option is enabled for
the sparse channel (Ga), a Yellow Clearance fault will be detected if the sparse channel
sequences from the Green input to the solid Red input without a minimum clearance time
on the Yellow input. The fault status will be displayed for the sparse channel (Ga).
2.16.2.5 YELLOW PLUS RED CLEARANCE
The Minimum Yellow Plus Red Clearance function is not designed to operate with Flashing
Yellow Arrows. This function must be Disabled for the FYA channels that provide the
Permissive flashing Yellow arrow. This allows the CU to sequence from the Permissive Left
turn channel directly to the Protected Left Turn channel without a solid Yellow arrow
clearance interval.
2.16.3 RED AND YELLOW INPUT ENABLE
The Red and Yellow outputs of the sparse channel of an FYA channel pair are typically not
loaded with a signal head and thus left floating. In these cases the Red and Yellow inputs
for the sparse FYA channels can be forced to the Off state in the CMUip-2212 by default.
This simplifies the cabinet wiring such that the use of dummy cabinet loads or modifications
to the Output harness are not necessary.
If the Red and Yellow outputs of the sparse channel of an FYA channel pair are driving
signal loads (such as a hard wired right turn overlap) then they must be monitored by the
CMUip-2212 at all times. The RY INPUT option should then be enabled for that channel.
The fault configuration parameters programmed for this Sparse channel of the FYA pair
only affects the Sparse channel and not the Primary channel, and should be enabled only
when the RY INPUT option is Enabled for that channel.
2.16.4 FLASH RATE DETECTION
When the FLASH RATE FAULT option is enabled, the CMUip-2212 will monitor a flashing
yellow arrow output for a lack of flashing operation. If any of the enabled flashing yellow
arrow signals remain active for more than the FYA Flash Rate Fault time (Section 5.2), the
CMUip-2212 will enter the fault mode, transfer the OUTPUT relay contacts to the Fault
position, and display the FYA FLASH-RATE FAIL status screen. The CMUip-2212 will
remain in the fault mode until the unit is reset by the RESET button.
2.16.5 FYA YELLOW TRAP CONFLICT DETECTION
When the FYA TRAP DETECT option is enabled, the CMUip-2212 will monitor each FYA
permissive turn channel for the FYA Yellow Trap condition. The FYA Yellow Trap conflict
condition occurs when the Permissive Turn channel (flashing yellow arrow) sequences to
