P/Pi Switching Function - Omron RX Series User Manual

6 Vector Control
Precautions for Correct Use Precautions for Correct Use
Before adjusting these parameters, adjust the motor parameters with no load. For details, refer to
6-2-3 Auto-tuning of Motor Parameters on page 6-5.
6-4-2

P/PI Switching Function

• This function is enabled when sensorless vector control, 0-Hz sensorless vector control, or sensor
vector control is selected as the control method.
• It enables the control gain setting for the speed control loop to be switched from normally used
proportional integral (PI) control to proportional (P) control.
• Switching to proportional (P) control lowers the overall speed control loop gain level and is an
effective method to reduce vibration etc.
It is used in the following cases.
Equipment generates a large friction force and a torque equivalent to that friction force is produced during
stop, resulting in an overload.
Switch the control method to proportional (P) control. By doing so, the torque during stop will decrease,
preventing overloading.
Equipment has low machine rigidity and is likely to cause vibration.
Switch the control method to proportional (P) control in a state where vibration is likely to occur. This prevents
vibration.
If two axes are coupled, switch the control method for one axis to proportional (P) control to keep balance with
the other.
Parameter No.
C001 to C008
H050/H250
H051/H251
H052/H252
Note 1 Sensorless vector control and 0-Hz sensorless vector control can be selected for the 1st/2nd control.
2 Sensor vector control can be selected for the 1st control.
• When the Multi-function Input S1 to S8 Selection (C001 to C008) is set to 43 (PPI: P/PI switching),
turning OFF/ON the signal switches the control method as follows.
OFF
ON
• When the Multi-function Input S1 to S8 Selection (C001 to C008) is not set to 43 (PPI: P/PI
switching), the inverter provides proportional integral control.
6 - 28
Function name
Multi-function Input S1 to
S8 Selection
1st/2nd PI Proportional
Gain
1st/2nd PI Integral Gain
1st/2nd P Proportional
Gain
Proportional integral control
Proportional control
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
Data
43: PPI (P/PI switching)
0.0 to 999.9, 1000.
0.0 to 999.9, 1000.
0.01 to 10.00
Default data Unit
– –
100.0 –
100.0 –
1.00 –