23-6* Trending
Trending is used to monitor a process variable over a period of time and record how often the data falls into
each of ten user-defined data ranges. This is a convenient tool to get a quick overview indicating where to put
focus for improvement of operation.
Two sets of data for Trending can be created in order to make it possible to compare current values for a selected
operating variable with data for a certain reference period, for the same variable. This reference period can be
pre-programmed (par.23-63
Timed Period Start and par.23-64 Timed Period Stop). The two sets of data can be
read from par.23-61
Continuous Bin Data (current) and par.23-62 Timed Bin Data (reference).
It is possible to create Trending for following operation variables:
-Power
- Current
- Output frequency
- Motor Speed
The Trending function includes ten counters (forming a bin) for each set of data containing the numbers of
registrations reflecting how often the operating variable is within each of ten pre-defined intervals. The sorting
is based on a relative value of the variable.
The relative value for the operating variable is
Actual/Rated * 100%
for Power and Current and
Actual/Max * 100%
for Output Frequency and Motor Speed.
The size of each interval can be adjusted individually, but will default be 10% for each. Power and Current can
exceed rated value, but those registrations will be included in 90%-100% (MAX) counter.
Once a second, the value of the operating variable selected is registered. If a value has been registered to equal
13%, the counter “10% - <20%” will be updated with the value “1”. If the value stays at 13% for 10s, then “10”
will be added to the counter value.
Parameter Description
TR200 Programming Guide 231
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