ABB ACS280, Руководство по прошивке, Страница: 60 / 430

60 Program features
The graph below shows the PID trim output in direct mode throughout the
speed range. A fixed trim speed reference is added throughout the speed range.
Note: In the above graph, it is assumed that the PID output is limited or stable
at 100. This is for clarity only. In real life scenarios, the PID output can vary based
on the setpoint and the actual value.
Example :
If:
parameter
40.52 Set 1 trim selection
= Speed
parameter 40.56 Set 1 trim source = PID output
parameter
30.12 Maximum speed
= 1500 rpm
parameter 40.01 Process PID output actual = 100 (limited to 100)
parameter
40.55 Set 1 trim adjust
= 0.5,
then:
Proportional
The proportional method is suitable for applications where tension control is
required throughout the speed range but not near zero speed.
In this mode, the PID trim output actual (parameter
40.05 Process PID trim
output act
) is relative to the reference selected by parameter
40.53 Set 1
trimmed ref pointer
and with
40.01 Process PID output actual
or
40.03 Process
PID setpoint actual
.
It is recommended that the speed reference selected in 40.53 Set 1 trimmed ref
pointer
and the reference source in
22.11 Ext1 speed ref1
are equal. This is
required to make the proportional mode active.
In most of the use cases, the process speed reference is connected in
40.53 Set
1 trimmed ref pointer
. For example, if EXT1 control mode is used and the
40.55 Set 1 trim adjust
Drive speed reference
0
40.05 Process PID trim output act
Par40.05
100
100
----------
 
 
1500  0.5 
=
Par40.05 750
=