ABB ACS280 Firmware Manual page 61

reference source is AI scaled, then
ref pointer
should be configured to
40.05 Process PID trim output act
Parameter
formula:
Par40.01

Par40.05
------------------------
=

100
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
40.53 Set 1 trimmed ref pointer
of parameter
40.05 Process PID trim output act
0
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:
40.52 Set 1 trim selection
parameter
40.56 Set 1 trim source
parameter
40.53 Set 1 trimmed ref pointer
parameter
22.11 Ext1 speed ref1
parameter
12.20 AI1 scaled at AI1 max
parameter
12.12 AI1 scaled value
parameter
40.01 Process PID output actual
parameter
40.55 Set 1 trim adjust
parameter
then:
100

Par40.05
--------- -
=

100
Par40.05 375
=
22.11 Ext1 speed ref1

 Par40.53 

40.53 Set 1 trimmed ref pointer
=
AI1 scaled
=
= 750 (AI1 actual scaled value)
= 0.5,

750 0.5
 

AI1 scaled.
is calculated using the following
Par40.55
.
40.55 Set 1 trim adjust
Speed
=
PID output
AI1 scaled
=
= 1500
= 100 (limited to 100)
Program features 61
40.53 Set 1 trimmed
and