ABB ACS560 - Page 57

Program features 57
source is AI scaled, then 22.11 Ext1 speed ref1 and 40.53 Set 1 trimmed ref pointer
should be configured to AI1 scaled.
The 40.05 Process PID trim output act is calculated using below 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/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,
Par. 40.52 Set 1 trim selection = Speed
Par. 40.56 Set 1 trim source = PID output
Par. 40.53 Set 1 trimmed ref pointer = AI1 scaled
Par. 22.11 Ext1 speed ref1 = AI1 scaled
Par. 12.20 AI1 scaled at AI1 max = 1500
Par. 12.12 AI1 scaled value = 750 (AI1 actual scaled value)
Par. 40.01 Process PID output actual = 100
Par. 40.55 Set 1 trim adjust = 0.5
Then,
Par40.05
Par40.01
100
------- ------------------


Par40.53 Par40.55=
40.05 Process PID trim output act
40.55 Set 1 trim adjust
40.53 Set 1 trimmed ref pointer
0
Par40.05
100
100
------- ---


750 0.5=
Par40.05 375=