BENTLY 128229-01 (3500/42M small card) overspeed detection module card set

Description

3500/42M 128229-01 When used in a TMR configuration, 3500/42 monitors and Proximitor/Seismic

TMR I/O Modules must be installed adjacent to each other in groups of three.

When used in this configuration, two types of voting are employed to ensure

accurate operation and to avoid single point failures.

3500/42M 128229-01 The first level of voting occurs on the TMR Relay Module. With this voting, the

selected alarm outputs for the three monitors are compared in a 2 out of 3

method. Two monitors must agree before the relay is driven. Refer to the

3500/32 & 34 Relay Module Operation and Maintenance Manual for more

information on this voting.

3500/42M 128229-01 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. 3500/42M 128229-01 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. 3500/42M 128229-01 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.

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