General Information
3500/42 Operation and Maintenance
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The second type of voting is referred to as "Comparison" voting. With this type
of voting, the proportional value outputs of each monitor in the group are
compared with each other. If the output of one monitor differs from the output of
the other monitors in the group by a specified amount, that monitor will add an
entry to the System Event list. Configure comparison voting by setting
Comparison and % Comparison in the Rack Configuration Software.
Comparison: The enabled proportional value of the TMR monitor group that is
used to determine how far apart the values of the three monitors can be to
each other before an entry is added to the System Event List.
% Comparison: The highest allowed percent difference between the middle
value of the three monitors in a TMR group and the individual values of each
monitor.
For TMR applications, two types of input configurations are available: bussed or
discrete. Bussed configuration uses the signal from a single nonredundant
transducer and provides that signal to all modules in the TMR group through a
single 3500 Bussed External Termination Block.
Discrete configuration requires three redundant transducers at each
measurement location on the machine. The input from each transducer is
connected to separate 3500 External Termination Blocks.
2.2
Available Data
The Proximitor/Seismic Monitor returns specific proportional values dependent
upon the type of channel configured. This monitor also returns both monitor and
channel statuses which are common to all types of channels.
2.2.1 Statuses
The following statuses are provided by the monitor. This section describes the
available statuses and where they can be found.
Monitor Status
OK
This indicates if the monitor is functioning correctly. A not OK status is
returned under any of the following conditions:
Module Hardware Failure
Node Voltage Failure
Configuration Failure
Transducer Failure
Slot ID Failure
Keyphasor Failure (if Keyphasor signals are assigned to channel pairs)
Channel not OK
If the Monitor OK status goes not OK, then the system OK Relay on the Rack
Interface I/O Module will be driven not OK.
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