ABB ACS280 Firmware Manual page 59

The examples provided in this chapter are based on PID set 1. You can set the
desired values for the PID trim function parameters to get the expected result.
When PID trim is activated, bit 5 Trim mode is set to 1 in parameter
Process PID status word
See the speed, torque and frequency reference chains in chapter
chain diagrams
for more information on the PID trim addition to the respective
reference chains.
The following PID trim modes are available:
Direct
•
Proportional
•
Combined
•
Direct
The direct method is suitable when you need tension control at fixed rpm/line
speed.
In this mode, the PID trim output (parameter
is relative to the maximum speed (parameter
30.20 Maximum torque 1
(
make the selection with parameter
The calculated trimmed output actual is the same throughout the speed range
with respect to the stable PID output.
40.05 Process PID trim output act
The
formula:
Par40.05
=
.
) or frequency (
40.52 Set 1 trim selection
Par40.01
 
  Par30.12 or 30.20 or 30.14
------------------------
 
100
40.05 Process PID trim output act
30.12 Maximum speed
30.14 Maximum frequency
value is calculated using the following
Program features 59
40.06
10 Control
), torque
). You can
.
  Par40.55
)