
Programming and Parameters
3-27
SPE
ED COMMAN
D
Pr
ocess
PI
125 [PI Control]
Controls the PI regulator. You can use a Datalink parameter or an assigned digital
input to write to this parameter.
PI control allows the drive to take a reference signal (setpoint) and an actual
signal (feedback) and automatically adjust the speed of the drive to match the
actual signal to the reference.
Proportional control (P) adjusts the output based on the size of the error (larger
error = proportionally larger correction).
Integral control (I) adjusts the output based on the duration of the error. The
integral control by itself is a ramp output correction. This type of control gives a
smoothing effect to the output and will continue to integrate until zero error is
achieved.
By itself, integral control is slower than many applications require, and, therefore,
is combined with proportional control (PI).
The purpose of the PI regulator is to regulate a process variable such as position,
pressure, temperature, or flow rate, by controlling speed.
There are two ways the PI regulator can be configured to operate (see parameter
124):
•
Process trim, which takes the output of the PI regulator and sums it with a
master speed reference to control the process.
•
Process control, which takes the output of the PI regulator as the speed
command. No master speed reference exists, and the PI output directly
controls the drive output.
Option Descriptions
PI Enable
Enables/disables operation of the PI loop.
PI Hold
Enabled: Integrator for the outer control loop is held at the current
level (will not increase).
PI Reset
Enabled: Integrator for the outer control loop is reset to zero.
Disabled: Integrator for the outer control loop integrates normally.
F
ile
Gr
oup
No
.
Parameter Name and Description
See
page 3-2
for symbol descriptions
Values
Re
lated
0
0
x
0
x
x
x
x
x
x
x
x
x
x
x
x
10
0
1
2
3
4
5
6
7
8
9
11
12
13
14
15
1
=Enabled
0
=Disabled
x =
R
eserved
Bit #
Factory Default Bit Values
PI Enable
PI Hold
PI
R
eset
N
ibble 1
N
ibble 2
N
ibble 3
N
ibble 4
+
+
In Limit
(134)
(138)
(125)
(129)
(130)
(131)
(132)
(128)
(126)
PI_
S
tatus
Hold
PI Output
PI PosLmt
PI
N
egLmt
PI Kp
–
+
PI
R
ef
PI FB
PI Ki
Содержание 9VT201-007HTNNN
Страница 1: ...VTAC 9 AC Drive Firmware Version 3 xx User Manual ...
Страница 4: ...soc 2 ...
Страница 14: ...P 8 Overview Publication 9VT UM001D EN P Notes ...
Страница 56: ...1 42 Installation Wiring Publication 9VT UM001D EN P Notes ...
Страница 62: ...2 6 Start Up Publication 9VT UM001D EN P Notes ...
Страница 130: ...3 68 Programming and Parameters Publication 9VT UM001D EN P Notes ...
Страница 150: ...4 20 Troubleshooting Publication 9VT UM001D EN P Notes ...
Страница 176: ...A 26 Supplemental Drive Information Publication 9VT UM001D EN P Notes ...
Страница 196: ...B 20 Using the LCD OIM Publication 9VT UM001D EN P Notes ...
Страница 212: ...C 16 Application Notes Publication 9VT UM001D EN P Notes ...
Страница 223: ......