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47.3.1
Fault Filtering
Purpose
The purpose of the subfunction is to determine whether a fault is
present or absent, see figure below, and the nature of the fault.
Disturbance/
Measurement
Figure 141
Preconditions and initiation
The selftest and supervision function has detected a disturbance.
Description
All disturbances are filtered before a fault is considered to be present or
absent. The filtering function is adapted to each fault situation for
optimum performance. Each fault has its own specified fault filter
parameters. For example, the following parameters (or combinations of
parameters) may be used for the filter function:
•
•
•
EN/LZT 720 0008
P2A
2001-11-28
Fault filter
Fault filter
parameters
Fault Filter
Frequency of disturbances
−
A frequency which is too high is considered to be a fault
The measurement value of a parameter
−
A parameter exceeding a threshold is considered to be a
fault.
Time
−
A condition which is valid for too long is considered to
be a fault
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Diagnostics and Fault Handling
Fault present/
fault absent
P002833A
379 (485)
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