889-3809-00
Model 2018 Operations Manual Rev Apr 2020 Page
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of 41
Yellow Disable Jumpers
: When Yellow Disable is jumpered for a channel that Yellow is removed
from short clearance testing when looking for conflicting displays.
LED Thresholds
: When LED Thresholds is enabled the monitor senses Greens and Yellows as ON
when their voltage is above 70V
RMS
and OFF when below 50V
RMS
for the short Yellow test.
Flashing Yellow Arrow Left Turns
: When Flashing Yellow Arrow (FYA) Left Turns are enabled and a
Channel has an FYA setting with a green or yellow border for one of its child channels (child channel
is permissive with the parent channel), then that child, whether green or yellow, will be checked for
short clearance.
Multi Indication & Short Yellow Monitoring Jumper
: When the Multi Indication & Short Yellow
jumper is installed the monitor performs the short clearance testing regardless of the state of the Red
Enable input.
2.5.6
+24 VOLTS DC MONITORING
Configuration:
+24VDC monitoring is always performed.
Test Preformed:
A voltage greater than +22V
DC
applied to the +24 Volt input is recognized as adequate for proper
operation. A voltage of less than +18V
DC
is recognized as inadequate for proper operation. When the +24 Volt
input is detected as inadequate for more than 350 milliseconds, the monitor generates a fault. A +24V failure
during the power up or power recovery sequence shall not cause a fault.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition, activates the Stop Time
output, and illuminates the
VDC FAILED
indicator on the front panel. The Signal Sequence log and the Prior
Faults log will record this fault.
Resetting the Fault:
The monitor remains in this fault condition until the unit is reset by the activation of the front
panel reset pushbutton or the activation of the reset input. Power loss or power interruption will not reset this fault.
The Reset log will record the resetting of this fault.
Modifying Inputs:
None
Feature Interactions:
+24VDC Enhanced Monitoring
: When enabled, high voltage monitoring and ripple monitoring will
be performed on the +24VDC input as well as the low voltage monitoring.
2.5.7
WATCHDOG MONITORING
Configuration:
The setting of Watchdog switch determines if this feature is active. The testing default for this
feature should be enabled.
NOTE: The Model 2018 monitor can be factory configured without the Watchdog switch. If the switch is not
present, the monitor will operate with the Watchdog monitoring function permanently enabled.
Test Preformed:
The Watchdog Timer input (Rear Edge Connector - Pin 22) is monitored. A voltage of less than
4V
DC
is recognized as a low and a voltage greater than 12V
DC
is recognized as a high. The input must change
states at least once every 1500 milliseconds or the monitor generates a fault. Testing is disabled if the line voltage
drops below 98V
RMS
and enabled when the line voltage goes above 103V
RMS
.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition, activates the Stop Time
output, and flashes the
WDT ERROR
indicator on the front panel. The Signal Sequence log and the Prior Faults
log will record this fault.
Resetting the Fault:
The monitor remains in this fault condition until the unit is reset by the activation of the front
panel reset pushbutton or the activation of the reset input. Power loss or power interruption will not reset this fault.
The Reset log will record the resetting of this fault.
Modifying Inputs:
None
Feature Interactions:
2010 Mode
: When the 2010 mode of operation is enabled the timer threshold is changed from 1500
milliseconds to 1000 milliseconds for fault detection.
Force Watchdog to 1500 Milliseconds
: When the 2010 mode of operation is enabled the timer
threshold is forced to stay at 1500 milliseconds for fault detection.
