Rockwell Automation 20B PowerFlex 70, PowerFlex 700 Reference Manual User Manual
Page 148
Process PI Loop
148
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
For example, winders using torque control rely on PD control not PI control.
Also, [PI BW Filter] is useful in filtering out unwanted signal response in the PID
loop. The filter is a Radians/Second low pass filter.
Percent of Reference
When using Process PID control the output can be selected as percent of the
Speed Reference. This works in Speed trim mode only, not in Torque Trim or
Exclusive Mode.
Example
% of Ref selected, Speed Reference = 43 Hz, PID Output = 10%, Maximum
Frequency = 130 Hz. 4.3 Hz will be added to the final speed reference.
% of Ref not selected, Speed Reference = 43 Hz, PID Output = 10%, Maximum
Frequency = 130 Hz. 13.0 Hz will be added to the final speed reference.
Scale Blocks with PID
Scale Blocks are now included in the Reference and Feedback selections of the
Process PID controller. This selects the output of the scale block for use as
Reference or Feedback to the Process PID.
Trim % of Reference
The Trim function of the drive can be selected as % of Reference or % of
Maximum Frequency.
124 [PI Configuration]
Sets configuration of the PI regulator.
124
thru
138
126 [PI Reference Sel]
Selects the source of the PI reference.
(1)
Vector firmware 3.001 and later.
Default:
Options:
0
0
1
2
3-6
7
8
9
10
11-1
7
18-2
2
23-2
4
25
26
27
28
“PI Setpoint”
“PI Setpoint”
“Analog In 1”
“Analog In 2”
“Reserved”
“Pulse In”
“Encoder”
“MOP Level”
“Master Ref”
“Preset Spd1-7”
“DPI Port 1-5”
“Reserved”
“Scale Block 1”
(1)
“Scale Block 2”
(1)
“Scale Block 3”
(1)
“Scale Block 4”
(1)
024
124
thru
138
0
0
0
0
0
0
0
0
0
0
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 =Reserved
Bit #
* Vector Control Option Only
** Vector firmware 3.001 & later
Factory Default Bit Values
Exc
l Mode
In
ver
t Err
or
Preload Mode
Ramp Ref
Zer
o Clamp
Feedbak Sqr
t
Stop Mode
Anti-Wind Up
To
rque T
rim
*
% of Ref **