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MMU2-16LE Series SmartMonitor
A continuously activated RESET input will not prevent the MMU2-16LE SmartMonitor
from monitoring any fault condition and/or transferring the OUTPUT relay contacts to
the fault position. This function prevents the Cabinet Assembly from being operated
with the monitor unit disabled due to a faulty RESET button or EXTERNAL RESET
input.
3.6 DISPLAY LED TEST
The monitor will illuminate all front panel LED and LCD indicators for 500ms when a
Reset command is issued by the front panel RESET button or EXTERNAL RESET
input. This function provides a means to check the operation of all front panel
indicators.
3.7 RECURRENT PULSE DETECTION
This error detection function supplements the normal Conflict, Dual Indication, and Red
Fail monitoring algorithms for sensing faults which are intermittent or pulsing in nature.
The RMS-Engine is designed to filter out short term transients commonly found on the
electrical service and provide noise immunity against false signal detections. The
Recurrent Pulse detection 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 which caused the
output to "flicker" On for 100 ms approximately every 200 ms. Because normal Conflict
detection requires a continuous fault of at least 350 ms typical, this event could go
undetected. The Recurrent Pulse detection algorithm will process these pulses into one
event and trigger a Conflict fault once the longer recurrent timing threshold is
exceeded.
When triggered by a recurrent pulse fault condition, the MMU2-16LE SmartMonitor
will enter the fault mode, transfer the Output relay contacts to the Fault position, and
display the appropriate RP CONFLICT, RP DUAL INDICATION, or RP RED FAIL
status screen. 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 typically range from 1000 ms minimum to 10
seconds maximum.
This function can be disabled by a UNIT Option called RECURRENT PULSE in the
SET / VIEW CONFIG menu. See Section 6.3.4.1.
3.8 TYPE FAULT
The TYPE SELECT input is used by the MMU2-16LE SmartMonitor
whether the monitor is to be configured as a Type 16 unit with 16 channels or a TS1
compatible Type 12 unit with 12 channels (see Section 1.4.2). This input is read by the
Eberle Design Inc.
®
Malfunction Management Unit
Operations Manual
®
®
®
to specify
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