SSINVERTER SSI700, User Manual, Page: 77 / 148

SSI700 User Manual Description of Function Codes
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These are current loop PI parameters for vector control. These parameters are
automatically obtained through "Asynchronous motor complete auto-tuning".and need not
be modified.
The dimension of the current loop integral regulator is integral gain rather than integral
time.
Notes
that too large current loop PI gain may lead to oscillation of the entire control loop.
Therefore, when current oscillation or torque fluctuation is great, manually decrease the
proportional gain or integral gain here.
Property
Default Setting Range Parameter Name
Function
Code
Group P2: Vector Control Parameters
☆
0
Unit's digit: integral separation
0: Disabled
1: Enabled
Speed loop integral
property
P2-17
Group P3: V/F Control Parameters
Group P3 is valid only for V/F control.
The V/F 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.
Property
Default Setting Range Parameter Name
Function
Code
Group P3: V/F Control Parameters
★ 50.0HZ
0.00 Hz to maximum output
frequency Cut-off frequency of
torque boost
P3-00
☆
Model
dependent
0.0% (fixed torque boost) 0.1%–
30.0%
Torque boost P3-01
To compensate the low frequency torque characteristics of V/F control, you can boost the
output voltage of the AC drive at low frequency by modifying P3-01.
If the torque boost is set to too large, the motor may overheat, and the AC drive may
suffer overcurrent.
If the load is large and the motor startup torque is insufficient, increase the value of P3-01.
If the load is small, decrease the value of P3-01. If it is set to 0.0, the AC drive performs
automatic torque boost. In this case, the AC drive automatically calculates the torque
boost value based on motor parameters including the stator resistance.
P3-00 specifies the frequency under which torque boost is valid. Torque boost becomes
invalid when this frequency is exceeded, as shown in the following figure.
Figure 6-4 Manual torque boost