54 Program features
Settings
• Main menu
Connection macro PID or Main menu Complete
parameter list parameter 96.04 PID.
• Parameter groups 40 Process PID set 1 (page 295) and 41 Process PID set 2
(page 309).
PID trim function
The PID trim function is used to maintain the set tension either by trimming the drive
main speed reference or torque reference (speed controller output).
WARNING! Make sure that the drive acceleration and deceleration time is set
to 0 when using PID trim function. This is required to perform quick tension
control by speed correction.
PID trim is implemented as one of the Process PID functions (parameter group 40
Process PID set 1 and 41 Process PID set 2). Both PID set1 and PID set 2 can be
used for this functionality.
The trimmed output is calculated from parameter 40.01 Process PID output actual or
40.03 Process PID setpoint actual. This is based on the selection in parameter 40.56
Set 1 trim source (for process PID set 1) or 41.56 Set 2 trim source (for process PID
set 2). In most of the use cases, 40.56 Set 1 trim source or 41.56 Set 2 trim source is
set as PID output.
PID trim functionality in Variable Frequency Drive (VFD) is used in applications where
tension control of the material is very essential. For example, auxiliary drives in metal
process industries, infeed and outfeed of rotogravure printing machines, surface
winder etc.
You must link the trimmed output from PID to the speed chain manually if PID
trimmed output is used for trimming speed. Set below parameters as follows:
Parameter Value
22.11 Ext1 speed ref1 Process speed reference given by 22.11 Ext1 speed ref1 source
22.12 Ext1 speed ref2 Other, 40.05 Process PID trim output act
22.13 Ext1 speed function Add (ref1 + ref2)
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