CMUip-2212 Cabinet Monitor Unit
Operations Manual
Eberle Design Inc.
Page 7
Minimum Yellow Change interval monitoring will be disabled when the MC COIL STATUS
input is not active. There is programming in the Datakey to disable Minimum Yellow
Change interval monitoring on a per channel basis.
2.8 YELLOW PLUS RED CLEARANCE MONITOR
The CMUip-2212 will verify that the Yellow Change plus Red Clearance interval between
the end of an active Green/Walk signal and the beginning of the next conflicting
Green/Walk signal is at least 2.7 +/-0.1 seconds. When the minimum Yellow Change plus
Red Clearance interval is not satisfied, the CMUip-2212 will cause a LFSA.
Minimum Yellow Change plus Red Clearance monitoring will be disabled when the MC
COIL STATUS input is not active. There is programming in the Datakey to disable Minimum
Yellow Change plus Red Clearance interval monitoring on a per channel basis.
2.9 LOCAL FLASH STATUS
The CMUip-2212 will monitor the LF STATUS input. This input is used to indicate to the
CMUip-2212 that the cabinet should be placed into NFSA as a result of the AUTO/FLASH
switch being transferred to the FLASH position. When this signal is sensed as not active for
greater than the Fault time (section 5.2), the CMUip-2212 will cause a NFSA. When this
signal is sensed as not active for less than the No Fault time (section 5.2) the CMUip-2212
will not cause a NFSA.
During Local Flash Status mode, the Auxiliary Display Unit (ADU) will display the active
field signals. This can be helpful to verify that flash mode is active on all outputs
appropriately. Note that a short time delay will be introduced to the ADU display in this
mode.
2.9.1 LOCAL FLASH STATUS RECOVERY
Recovery from Local Flash Status NFSA will occur when this signal is sensed as active for
greater than the Fault time (section 5.2).
2.10 CIRCUIT BREAKER TRIP STATUS
The CMUip-2212 will monitor the CB TRIP STATUS input. When one or more circuit
breakers have tripped this input will go to the not-active state. When this signal is sensed
as not active for greater than the Fault time (section 5.2) the CMUip-2212 will cause a
LFSA. When this signal is sensed as not active for less than the No Fault time (section 5.2)
the CMUip-2212 will not cause a LFSA.
2.11 FLASHER UNIT OUTPUT FAILED ALARM
The CMUip-2212 will monitor the FLASHER 1-1, FLASHER 1-2, FLASHER 2-1, FLASHER
2-2 voltage states reported by each HDFU. A second HDFU (#2) may be installed as an
option and must be enabled in the configuration parameters. A failed state may indicate a
malfunction of the connector system or flash voltage bus or HDFU unit.
When a transition from the inactive state to the active state or a transition from the active
state to the inactive state is absent for greater than the Active time (section 5.2), the
CMUip-2212 will set a status bit in the Type 209 (195) frame. This alarm condition will not
cause a FSA. It should cause the appropriate response in the ATC. This status is non-
latching such that once a status bit has been set, the sensing of five valid transitions of the
input will clear the status bit.
