HV580L Series Frequency Inverter
96
These parameters are used to set field weakening control for the synchronous motor.
If P2-18 is set to 0, field weakening control on the synchronous motor is disabled. In this case, the maximum
rotational speed is related to the AC drive bus voltage. If the motor's maximum rotational speed cannot meet
the requirements, enable the field weakening function to increase the speed.
The HV580L provides two field weakening modes: direct calculation and automatic adjustment.
• In direct calculation mode, directly calculate the demagnetized current and manually adjust the
demagnetized current by means of P2-19. The smaller the demagnetized current is, the smaller the total
output current is. However, the desired field weakening effect may not be achieved.
• In automatic adjustment mode, the best demagnetized current is selected automatically. This may influence
the system dynamic performance or cause instability.
The adjustment speed of the field weakening current can be changed by modifying the values of P2-21 and
P2-22. A very quick adjustment may cause instability. Therefore, generally do not modify them manually.
Group P3: V/F Control Parameters
Group P3 is only valid for VF control.
The VF control mode is applicable to low load applications (fan or pump) or applications where one AC drive
operates multiple motors or there is a large difference between the AC drive power and the motor power.
P3-00
V/F curve setting
Default
0
Setting Range
0
Linear VF
1
Multi-point VF
2
Square VF
3
1.2-power VF
4
1.4-power VF
6
1.6-power VF
8
1.8-power VF
9
Reserved
10
VF complete separation
11
VF half separation
0: Linear V/F. It is applicable to common constant torque load.
1: Multi-point VF. It is applicable to special load such as dehydrator and centrifuge. Any such VF curve can be
obtained by setting parameters of P3-03 to P3-08.
2: Square VF. It is applicable to centrifugal loads such as fan and pump.
3~8: VF curve between linear VF and square VF