ABB ACS180 - Page 76

76 Program features
source is AI scaled, then 22.11 Ext1 speed ref1 and 40.53 Set 1 trimmed ref pointer
should be configured to AI1 scaled.
Parameter 40.05 Process PID trim output act is calculated using the following
formula:
The below graph shows the PID trim output in proportional mode throughout the
speed range. Here, the trimmed output is directly proportional to the value of
parameter 40.53 Set 1 trimmed ref pointer.
Note: In the above graph, it is assumed that the PID output is limited or stable at 100.
This is for understanding purpose only. In real case scenario, PID output can vary
based on the setpoint and actual.
Example:
If:
parameter 40.52 Set 1 trim selection = Speed
parameter 40.56 Set 1 trim source = PID output
parameter 40.53 Set 1 trimmed ref pointer = AI1 scaled
parameter 22.11 Ext1 speed ref1 = AI1 scaled
parameter 12.20 AI1 scaled at AI1 max = 1500
parameter 12.12 AI1 scaled value= 750 (AI1 actual scaled value)
parameter 40.01 Process PID output actual = 100 (limited to 100)
parameter 40.55 Set 1 trim adjust = 0.5,
then:
Par40.05
Par40.01
100
------------------------


Par40.53 Par40.55=
40.55 Set 1 trim adjust
40.53 Set 1 trimmed ref pointer
0
40.05 Process PID trim output act
Par40.05
100
100
----------


750 0.5=
Par40.05 375=
ACS180 FW.book Page 76 Tuesday, March 9, 2021 2:25 PM