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.
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 = Speed
Par. 40.56 Set 1 trim source = PID output
Par. 30.12 Maximum speed = 1500 rpm
Par. 40.01 Process PID output actual = 100 (limited to 100)
Par. 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 to zero speed.
In this mode, the PID trimmed output (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 selected in 22.11 Ext1 speed ref1 and 40.53 Set 1
trimmed ref pointer are same. 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 reference
40.05 Process PID trim output act
40.55 Set 1 trim adjust
Drive speed reference
0
Par40.05
100
100
-------- --
1500 0.5=
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