Operating instructions

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 Contin-
uous 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.
NOTE
The counters starts counting whenever the frequency
converter is powered-up. Power cycle shortly after a
reset will zero the counters. EEProm data are updated
once per hour.
23-60 Trend Variable
Option: Function:
Select the desired operating variable to be
monitored for Trending.
[0]
* Power [kW] Power yielded to the motor. Reference for the
relative value is the rated motor power
programmed in par. 1-20 Motor Power [kW] or
par. 1-21 Motor Power [HP]. Actual value can be
read in par. 16-10 Power [kW] or
par. 16-11 Power [hp].
[1] Current [A] Output current to the motor. Reference for the
relative value is the rated motor current
programmed in par. 1-24 Motor Current. Actual
value can be read in par. 16-14 Motor Current.
[2] Frequency
[Hz]
Output frequency to the motor. Reference for
the relative value is the maximum output
frequency programmed in par. 4-14 Motor Speed
High Limit [Hz]. Actual value can be read in
par. 16-13 Frequency.
[3] Motor
Speed
[RPM]
Speed of the motor. Reference for relative value
is the maximum motor speed programmed in
par. 4-13 Motor Speed High Limit [RPM].
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CA.02 - VLT
®
is a registered Danfoss trademark 157
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