889-3809-02
Model 2018E Operations Manual Rev Apr 2020 Page
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of 39
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 2018E 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.
2.5.8
PROGRAMMING CARD ABSENT MONITORING
Configuration:
Program Card absent monitoring is always performed.
Test Preformed:
If the programming card is not present or not seated properly in the connector the monitor
generates a fault.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition, activates the Stop Time
output, and illuminates the
PC AJAR
indicator on the front panel. The Signal Sequence log and the Prior Faults
log will record this fault.
Resetting the Fault:
Proper insertion of a Program Card is required before the fault can be reset. The monitor
remains in this fault condition until the unit is reset by the activation of the front panel reset pushbutton, or
activation of the reset input. The Reset log will record the resetting of this fault.
