Danfoss VLT AQUA Drive FC 202 Programming Manual page 200

Parameter Description
3.20.4 23-6* Trending
Trending is used to monitor a process variable over time
and record how often the data falls into each of 10 user-
defined data ranges. This is a convenient tool to obtain a
3 3
quick overview indicating where to focus on improvement
of operation.
2 sets of data for trending can be created 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 (parameter 23-63 Timed Period Start and
parameter 23-64 Timed Period Stop). The 2 sets of data can
be read from parameter 23-61 Continuous Bin Data (current)
and parameter 23-62 Timed Bin Data (reference).
It is possible to create trending for the following operation
variables:
•
Power.
•
Current.
•
Output frequency.
•
Motor speed.
The trending function includes 10 counters (forming a bin)
for each set of data containing the numbers of
registrations reflecting how often the operating variable is
within each of 10 pre-defined intervals. The sorting is
based on a relative value of the variable.
The relative value for the operating variable is determined
as:
•
Actual/rated x 100% - for power and current.
•
Actual/max x 100% - for output frequency and
motor speed.
The size of each interval can be adjusted individually, but
is 10% for each as default. Power and current can exceed
rated value, but those registrations are included in 90–
100% (MAX) counter.
Relative value
operating variable
%
100
90
80
70
60
50
40
30
20
10
Illustration 3.77 Time and Relative Values
198
®
VLT AQUA Drive FC 202
Once per second, the value of the operating variable
selected is registered. If a value has been registered to
equal 13%, the counter 10 to <20% is updated with the
value 1. If the value stays at 13% for 10 s, 10 is added to
the counter value.
The contents of counters can be shown as bars on the LCP.
Select Quick Menu⇒Loggings: Trending Continued Bin/
Trending Timed Bin/Trending Comparison.
NOTICE
The counters start counting whenever the frequency
converter is powered up. A power cycle shortly after a
reset resets the counters. EEPROM data is updated once
per hour.
23-60 Trend Variable
Option:
[0]
[1]
[2]
*
[3]
Counter 9: +0
Counter 8: +6
Counter 7: +2
Counter 6: +1
Counter 5: +11
Counter 4: +0
Counter 3: +1
Counter 2: +0
Counter 1: +1
Counter 0: +5
Danfoss A/S © 05/2018 All rights reserved.
Function:
Select the required operating variable to be
monitored for trending.
Power [kW] Power yielded to the motor. Reference for the
relative value is the rated motor power
programmed in parameter 1-20 Motor Power
[kW] or parameter 1-21 Motor Power [HP]. The
actual value can be read in
parameter 16-10 Power [kW] or
parameter 16-11 Power [hp].
Current [A] Output current to the motor. Reference for the
relative value is the rated motor current
programmed in parameter 1-24 Motor Current.
The actual value can be read in
parameter 16-14 Motor current.
Frequency Output frequency to the motor. Reference for
[Hz] the relative value is the maximum output
frequency programmed in
parameter 4-14 Motor Speed High Limit [Hz]. The
actual value can be read in
parameter 16-13 Frequency.
Motor Reference for the relative value is the
Speed maximum motor speed programmed in
[RPM] parameter 4-13 Motor Speed High Limit [RPM].
MG20OB02