Rockwell Automation 22D PowerFlex 40P User Manual, FRN 3 - Manual (Page 186)

G-6 PID Set Up
PID Deadband
Parameter A138 [PID Deadband] is used to set a range, in percent, of the
PID Reference that the drive will ignore.
Example
•
[PID Deadband] is set to 5.0
•
The PID Reference is 25.0%
•
The PID Regulator will not act on a PID Error that falls between 20.0
and 30.0%
PID Preload
The value set in A139 [PID Preload], in Hertz, will be pre-loaded into
the integral component of the PID at any start or enable. This will cause
the drive’s frequency command to initially jump to that preload
frequency, and the PID loop starts regulating from there.
PID Limits
A130 [PID Trim Hi] and A131 [PID Trim Lo] are used to limit the PID
output and are only used in trim mode. [PID Trim Hi] sets the maximum
frequency for the PID output in trim mode. [PID Trim Lo] sets the
reverse frequency limit for the PID output in trim mode. Note that when
the PID reaches the Hi or Lo limit, the PID regulator stops integrating so
that windup does not occur.
PID Enabled
Freq Cmd
PID Output
PID Pre-load Value
PID Pre-load Value > 0