Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 79)

Rockwell Automation Publication 750-RM002B-EN-P - September 2013 79
Drive Configuration Chapter 1
PID Output Select
Parameter 1079 [PID Output Sel]
• “Not Used” (0) - PID output is not applied to any speed reference.
• “Speed Excl” (1) - PID output is the only reference applied to the speed
reference.
• “Speed Trim” (2) - PID output is applied to speed reference as a trim value.
(Default)
• “Torque Excl” (3) - PID output is only reference applied to torque
reference.
• “Torque Trim” (4) - PID output is applied to torque reference as a trim
value.
• “Volt Excl” (5) - PID output is only reference applied to voltage reference.
• “Volt Trim” (6) - PID output is applied to voltage reference as a trim value.
PID Configuration
Parameter 1065[PI Cfg] is a set of bits that select various modes of operation.
The value of this parameter can only be changed while the drive is stopped.
PID Preload
This feature steps the PID Output to a preload value for better dynamic response
when the PID Output is enabled. Refer to the diagram below. If PID is not
enabled, the PID Integrator can be initialized to the PID Preload Value or the
current value of the commanded speed. The operation of Preload is selected in
the PID Configuration parameter. By default, Preload Command is off and the
PID Load Value is zero, causing a zero to be loaded into the integrator when the
PID is disabled. As shown in Diagram A below, when the PID is enabled the PID
output starts from zero and regulates to the required level. When PID is enabled
with PID Load Value is set to a non-zero value the output begins with a step as
shown in Diagram B below. This can result in the PID reaching steady state
Fil
e
Gr
oup
No. Display Name
Full Name
Description Values
Read-W
ri
te
Da
ta
T
yp
e
APPLIC
AT
ION
S
Pro
ces
s P
ID
1065 PID Cfg
PID Configuration RW 16-bit
Integer
Main configuration of the Process PID controller.
Options
Res
er
ved
Res
er
ved
Res
er
ved
Res
er
ved
Res
er
ved
Res
er
ved
Res
er
ved
Res
er
ved
Res
er
ved
Pe
rc
en
t R
ef
Ant
i W
in
dup
Stop
Mo
de
Fdbk Sqr
t
Ze
ro
C
la
m
p
Ramp Ref Pre
lo
ad
In
t
Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 = Disabled
1 = Enabled