ABB ACS560 Firmware Manual page 57

General purpose drives
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source is AI scaled, then
should be configured to AI1 scaled.
The
40.05 Process PID trim output act
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 of
parameter
40.53 Set 1 trimmed ref
0
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
Par.
40.56 Set 1 trim source
Par.
40.53 Set 1 trimmed ref pointer
Par.
22.11 Ext1 speed ref1
Par.
12.20 AI1 scaled at AI1 max
Par.
12.12 AI1 scaled value
Par.
40.01 Process PID output actual
Par.
40.55 Set 1 trim adjust
Then,
100
--------- -
P ar40.05
=
100
Par40.05
=
375
22.11 Ext1 speed ref1
Par40.53
pointer.
40.53 Set 1 trimmed ref pointer
=
Speed
=
PID output
=
=
AI1 scaled
= 1500
= 750 (AI1 actual scaled value)
= 0.5
750
0.5
and
40.53 Set 1 trimmed ref pointer
is calculated using below formula:
Par40.55
40.55 Set 1 trim adjust
AI1 scaled
= 100
Program features 57

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