2010ECL-NYC SERIES SIGNAL MONITOR
OPERATIONS MANUAL
Eberle Design Inc.
Page 6
function is designed to respond to fault conditions which are intermittent in nature and do not
meet the continuous timing requirements of the normal detection algorithms, yet may still
produce improper signal displays. These input conditions are differentiated by their longer
time constant and fault response times.
The figure below shows a simple example of a recurrent Conflict fault. Channel 2 Green is
detected active due to a malfunction of the load switch that caused the output to flicker On
for 100 ms approximately every 200 ms. Since normal Conflict detection requires a
continuous fault of at least 350 ms duration, this event could go undetected. The Recurrent
Pulse detection algorithm will combine these pulses into one event and trigger a Conflict fault
once the longer recurrent timing threshold is exceeded.
When triggered by a recurrent fault condition, the Signal Monitor will enter the fault mode,
transfer the Output relay contacts to the Fault position, enable the Stop-Time output to the
controller, and illuminate the appropriate CONFLICT, DUAL, or RED FAIL indicator along
with the RP DETECT indicator. The unit will remain in the fault mode until reset by the Reset
button or the External Reset input. Fault response times will vary depending on the pulse
width and frequency of the recurrent inputs, but will range from 1000 ms minimum to 10.4
seconds maximum. Recurrent Pulse detection can be disabled with the RP DISABLE option
switch (SW3-2), see Section 4.4.2.
2.8 EXIT FLASH
When the Signal Monitor series exits the flash state (Output relay de-energized) as a result
of a Reset command or AC Line brownout restore, the Stop Time output will go to the inactive
state 250 _
+ 50 ms before the Output relay transfers to the energized state. This transition
will provide an early indication to the 2070 Controller Unit that the cabinet will transfer from
flash to signal operation.
2.9 NON-VOLATILE FAULT MEMORY
The Signal Monitor stores the fault and channel indicator status at the time the fault occurs
into a non-volatile EEPROM device. Should an AC Line power interruption occur while the
monitor is in the fault mode, then upon restoration of AC Line power, the Output relay and
Stop-Time output will remain in the fault mode and the correct fault and channel indicators
will be displayed.
The
“ECL” models use a lifetime lithium battery to maintain the time of day clock. Should this
battery fail, only current time and date functions will be lost. No monitor configuration
parameters or event log data is stored under battery power.
2.10 PCA (PROGRAM CARD ABSENT) INDICATION
If the Program Card is absent or not seated properly in the edge connector, the Signal Monitor
will enter the fault mode causing the Output relay contacts to close and enabling the Stop-
Time output to the controller. The PCA indicator will illuminate to indicate this condition. A
manual or external Reset is required after the Program Card is properly seated.
