Pid Trim Function - ABB ACS560 Firmware Manual

54 Program features
Settings
• Main menu 
parameter list
• Parameter groups
(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
Process PID set 1
used for this functionality.
The trimmed output is calculated from parameter
40.03 Process PID setpoint
Set 1 trim source (for process PID set 1) or
set 2). In most of the use cases,
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
22.11 Ext1 speed ref1
22.12 Ext1 speed ref2
22.13 Ext1 speed function
Connection macro
parameter
96.04
40 Process PID set 1
and 41 Process PID set
actual. This is based on the selection in parameter
40.56 Set 1 trim source
Value
Process speed reference given by
Other, 40.05 Process PID trim output act
Add (ref1 + ref2)
PID or Main menu
PID.
(page 295) and 41 Process PID set 2
2). Both PID set1 and PID set 2 can be
40.01 Process PID output actual
41.56 Set 2 trim source
or 41.56 Set 2 trim source
22.11 Ext1 speed ref1
 Complete
40
or
40.56
(for process PID
is
source