Chapter 4 Parameters
4-48
00.10
Control Method
Factory Setting: 0
Settings
0
V/f
Control
1
Vector
Control
This parameter determines the control method of the AC motor drive.
Control of V/f (Voltage/frequency)
1. To operate by the change of frequency and voltage without changing the mechanical
characteristic of motor: it can run by open-loop method and also can use with PG card (refer to
Appendix B) to run by close-loop method. In this control, it gets the change of the
electromagnetic torque of rotor and the load torque from the change of slip ratio.
2. The V/f control is the constant value control mode. Although it prevents the main questions
of the decreasing frequency and increasing magnetic field, the magnetic field is decreasing
with frequency. In such circumstance, insufficient motor torque will occur when the magnetic
field weakens in the low frequency. At this moment, it can get the best operation with Pr.07.02
setting(Torque Compensation) to get the torque compensation.
common applications: pump, conveyor belt, compressor and treadmill
Vector
control:
1. To operate by the change of frequency and voltage without changing the mechanical
characteristic of motor: it can run by open-loop method and also can use with PG card (refer to
Appendix B) to run by close-loop method. In this mode, it is coordinate change. The physical
essence is the relativity of motion. That means the change of rotor current only has relation
with electromagnetic torque and the change of stator current only has relation with
electromagnetic torque. This is the characteristic of vector control.
2.The vector control can eliminate the relation between electromagnetic current vector and
armature flux. Thus, it can control the current vector and armature flux independently to raise
the transient response of the AC motor drive.
Applications: textile equipment, press equipment, life equipment and drilling machine.
Related parameter: Pr.07.02 (Torque Compensation (Motor 0))
00.11
Reserved
00.12
50Hz Base Voltage Selection
Factory Setting: 0
Settings
0
230V/400V
1
220V/380V
This parameter determines the base voltage for 50Hz.
When Pr.00.02 is set to 9, the base voltage for 50Hz will set by Pr.00.12.
Related parameter: Pr.00.02 (Parameter Reset)
