3.21.4 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.
The contents of counters can be displayed as bars on LCP. Select
Quick Menu
>
Loggings
:
Trending Continued Bin / Trending Timed Bin / Trending
Comparison
.
VLT
®
HVAC Drive Programming Guide 3 Parameter Description
MG.11.C9.02 - VLT
®
is a registered Danfoss trademark
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