889-3819-00
MMU2-1600GE series Operations Manual Rev Apr 2020 Page
14
of 51
2.5.9
+24 VOLT MONITOR I
Configuration:
The 24V Latch jumper on the Program Card determines whether this fault is a latched fault. The
testing default for this feature is determined by the jumper installed on the program card. Typically no jumper is
installed during automated testing.
Test Preformed:
A voltage greater than +22V
DC
applied to the +24 Volt Monitor I 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 Monitor I input is detected as inadequate for more than 175 milliseconds, the monitor generates a fault.
A +24V Monitor I failure during the programmed Minimum Flash time or during a monitor Power Failure shall not
cause a fault.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition (continuity between the
Normally Open and Common contacts), illuminates the
24V-1
indicator on the front panel, and sets the +24 Volt
Monitor I bit (bit 58) of the Type 129 Frame to 1. The Signal Sequence log and the Prior Faults log will record this
fault.
Resetting the Fault:
Restoration of proper voltage to the +24V Monitor I input will reset this fault. Once tripped
to the fault state, the minimum flash time must time before normal operation can be restored. The Reset log will
record the resetting of this fault.
If the 24V Latch jumper is installed on the Program Card, 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.
Modifying Inputs:
+24V Monitor Inhibit
: +24V Monitor I failures will be ignored when this input is below 8V
DC
.
Feature Interactions:
None
2.5.10
+24 VOLT MONITOR II
Configuration:
The 24V Latch jumper on the Program Card determines whether this fault is a latched fault. The
testing default for this feature is determined by the jumper installed on the program card. Typically no jumper is
installed during automated testing.
Test Preformed:
A voltage greater than +22V
DC
applied to the +24 Volt Monitor II 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 Monitor II input is detected as inadequate for more than 175 milliseconds, the monitor
generates a fault. A +24V Monitor II failure during the programmed Minimum Flash time or during a monitor
Power Failure shall not cause a fault.
Fault Action:
The monitor transfers the Output relay contacts to the fault condition (continuity between the
Normally Open and Common contacts), illuminates the
24V-2
indicator on the front panel, and sets the +24 Volt
Monitor II bit (bit 59) of the Type 129 Frame to 1. The Signal Sequence log and the Prior Faults log will record
this fault.
Resetting the Fault:
Restoration of proper voltage to the +24V Monitor II input will reset this fault. Once tripped
to the fault state, the minimum flash time must time before normal operation can be restored. The Reset log will
record the resetting of this fault.
If the 24V Latch jumper is installed on the Program Card, 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.
Modifying Inputs:
+24V Monitor Inhibit
: +24V Monitor II failures will be ignored when this input is below 8V
DC
.
Feature Interactions:
24V-2 To 12VDC
: When this feature is enabled the voltage thresholds used are changed from greater than
+22V
DC
being valid to greater than +11.5V
DC
and a voltage of less than +18V
DC
being invalid to less than
+10.75V
DC
.
2.5.11
CONTROLLER VOLTAGE MONITOR
Configuration:
The CVM Latch jumper on the Program Card determines whether this fault is a latched fault. The
testing default for this feature is determined by the jumper installed on the program card. Typically no jumper is
installed during automated testing.
Test Preformed:
A voltage of less than 8V
DC
is recognized as proper operation. A voltage greater than 16V
DC
is
recognized as improper operation. When the CVM input is detected as improper for more than 175 milliseconds,
the monitor generates a fault. A CVM failure during the programmed Minimum Flash time or during a monitor
Power Failure shall not cause a fault.
