ABB ACS280, Firmware Manual, Page: 58 / 430

58 Program features
Tracking
In tracking mode, the PID block output is set directly to the value of parameter
40.50
(or
41.50
).The internal I term of the PID controller is set so that no
transient is allowed to pass on to the output, so when the tracking mode is left,
normal process control operation can be resumed without a significant bump.
Settings and diagnostics
Parameter 96.04 Macro select (page 296 ).
Parameter groups
40 Process PID set 1
(page
224
) .
Events: -

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 the PID trim function. This is required to do quick
tension control by speed correction.
PID trim is implemented as one of the Process PID functions (parameter groups
40 Process PID set 1
). Both PID set 1 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
. In most cases
40.01 Process PID
output actual
is used. This is based on the selection in parameter
40.56 Set 1
trim source (for process PID set 1). In most of the use cases, the value of
parameter
40.56
.
PID trim functionality in Variable Frequency Drives (VFD) is used in applications
where tension control of the material is essential. For example, auxiliary drives
in metal process industries, infeed and outfeed of rotogravure printing
machines, and surface winders.
Tension measurement
Drive rollers (pull)
Speed controlled conveyor line