ABB ACS560 Firmware Manual page 56

56 Program features
The below graph shows the PID trim output in direct mode throughout the speed
range. A fixed trim speed reference is added throughout the speed range.
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. 30.12 Maximum speed
Par. 40.01 Process PID output actual
Par. 40.55 Set 1 trim adjust
Then,
100

--------- -
Par40.05 =

100
Par40.05 750
=
Proportional
The proportional method is suitable for applications where tension control is required
throughout the speed range but not near to zero speed.
In this mode, the PID trimmed output
the reference selected by parameter
Process PID output actual
It is recommended that the speed reference selected in
pointer and the reference source selected in
trimmed ref pointer
In most of the use cases, the process speed reference is connected in
trimmed ref pointer. For example, if EXT1 control mode is used and the reference
Drive speed reference
= Speed
= PID output
= 1500 rpm
= 0.5

 
1500 0.5

or 40.03 Process PID setpoint
are same. This is required to make the proportional mode active.
40.55 Set 1 trim adjust
= 100 (limited to 100)
(40.05 Process PID trim output
40.53 Set 1 trimmed ref pointer
22.11 Ext1 speed ref1
act) is relative to
and with
actual.
40.53 Set 1 trimmed ref
and 40.53 Set 1
40.53 Set 1
40.01