Model MMU-1600G Series Op Man - Ver 1.07.23 - Rev 20151026DL
Page 15 of 58
Modifying Inputs:
Red Enable
: All dual indication testing will be disabled when this input is below 70V
RMS
.
Load Switch Flash bit (bit 112) of the Type 0 Frame
: All dual indication testing will be disabled when this bit is set to
one.
Feature Interactions:
Field Check
: Enabling dual indication monitoring will also enable field check monitoring.
Minimum Yellow Change Disable Jumpers
: When Minimum Yellow Change Disable is jumpered for a channel the Red +
Yellow fault timing threshold for the single indication timer is changed from 1000 milliseconds to 400 milliseconds.
Flashing Greens (also known as Canadian Fast Flash)
: When Flashing Greens are enabled the no indication timer
thresholds for the Green + Red and Green + Yellow fault conditions are changed from 300 milliseconds to 100
milliseconds.
Flashing Yellow Arrow Left Turns
: When Flashing Yellow Arrow (FYA) Left Turns are enabled and a Channel has an
FYA setting of “G” for one of its child channels, then the Green of the child channel will be included in the dual
indication test for that channel. If a Channel has an FYA setting of “Y” for one of its child channels, then the Yellow of
the child channel will be included in the dual indication test for that channel. This will effectively add the following dual
indication tests: Red + FYA, Yellow + FYA, and Green + FYA. Also the timing thresholds are different for dual
indications involving an FYA. The dual indication timer threshold is 1500 milliseconds, single indication timer threshold
is 1000 milliseconds, and the no indication timer threshold is 300 milliseconds.
LED Thresholds
: When LED Thresholds is enabled the monitor senses Greens, Yellows, Reds, and Walks as ON when
their voltage is above 25V
RMS
and OFF when below 15V
RMS
for the dual indication test.
2.5.4 GY-Dual Indication Monitoring
Configuration:
Green-Yellow Monitoring Enabled is used to enable monitoring for this fault. When enabled all channels
will have a minimum of Green + Yellow dual indication monitoring. All channels with a setting of “Y” for Dual Indication /
Field Check will be monitored for all dual indication fault combinations (See Section
2.5.3
for fault combinations). The
testing default for this feature is disabled.
Test Preformed:
When a channel has a Green and a Yellow display active a dual indication timer is started. If one of the
indications turns off the dual indication timer is stopped (it is not cleared) and a single indication timer is started. If both of
the indications turn off the dual indication timer is stopped (it is not cleared) and a no indication timer is started. If the dual
indication condition returns the single indication and no indication timers are stopped (not cleared) and the dual indication
timer continues timing from its prior value. If the dual indication timer reaches 600 milliseconds or more the monitor will
latch a dual indication fault. If the single indication timer reaches 1000 milliseconds the dual indication timer, the single
indication timer, and the no indication timer are reset to zero and the dual indication is ignored. If the no indication timer
reaches 300 milliseconds the dual indication timer, the single indication timer, and the no indication timer are reset to zero
and the dual indication is ignored. The normal voltage thresholds for this test are: Reds – ON when above 70V
RMS
and OFF
when below 50V
RMS
, Greens / Yellows / Walks – ON when above 25V
RMS
and OFF when below 15V
RMS
.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition (continuity between the Normally Open
and Common contacts), illuminates the
DUAL IND
indicator on the front panel, and sets the Spare Bit #2 bit (bit 68) of the
Type 129 Frame to 1. 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:
Red Enable
: All Green + Yellow dual indication testing will be disabled when this input is below 70V
RMS
.
Load Switch Flash bit (bit 112) of the Type 0 Frame
: All Green + Yellow dual indication testing will be disabled when
this bit is set to one.
Feature Interactions:
Flashing Greens (also known as Canadian Fast Flash)
: When Flashing Greens are enabled the no indication timer
threshold for the Green +Yellow fault condition is changed from 300 milliseconds to 100 milliseconds.
LED Thresholds
: When LED Thresholds is enabled the monitor senses Greens, Yellows, Reds, and Walks as ON when
their voltage is above 25V
RMS
and OFF when below 15V
RMS
for the dual indication test.
