P/Pi Switching Function - Omron 3G3RX User Manual

P/PI Switching Function

•This function allows you to switch the control (compensation) method for the speed control system
between proportional integral compensation and proportional compensation, when "sensorless
vector control", "0-Hz sensorless vector control", or "sensor vector control" is selected as the
control method.
Parameter No. Function name
V/f characteristics
A044/A244/A344
Multi-function inputs
C001 to C008
1 to 8 selection
H005/H205 Speed response
H050/H250 PI proportional gain
H051/H251 PI integral gain
H052/H252 P proportional gain
•If P/PI switching is selected in the multi-function input selection, proportional integral compensation
is enabled while the signal is off; proportional compensation is enabled while the signal is on.
If P/PI switching is not selected in multi-function inputs 1 to 8 (C001 to C008), proportional integral
compensation is enabled.
Normally, the Inverter performs proportional integral compensation
(PI control) for speed control so that the difference between
frequency reference and actual rpm becomes zero. If one load is
operated by several motors, however, proportional control (P
control) may be required. To enable proportional control (P
control), allocate the P/PI switching function to any of multi-
function input terminals 1 to 8 (set "43" in any of C001 to C008)
via the Digital Operator, and turn on the terminal. If you choose to
enable proportional control, set a "KPP" value in H052 (P
proportional gain).
The relationship between the KPP value and speed change ratio
is expressed broadly in the following formula:
(Speed change ratio) =
(KPP set value)
The relationship between speed change ratio and speed error is
expressed broadly in the following formula:
Speed error at rated torque (A)
(Speed change ratio) =
Synchronous rpm at base frequency
03: SLV (Sensorless vector control)
(A344 is blank.)
04: 0SLV (0 Hz sensorless vector
selection
control) (A344 is blank.)
05: V2 (Sensor vector control)
43: PPI (P/PI switching)
0.001 to 80.000
0.0 to 1000.0
0.0 to 1000.0
0.01 to 10.00
10
%
Data Default setting
P control
Torque
100%
0
× 100%
4-2 Function Mode
Unit

00
 

1.590
100.0 %
100.0 %

1.00
PI control
(A)
rpm
4-92
4