Function Applications
-483-
Para. No. Name
Default
Value Range Description
F3-26
Frequency rise
threshold during
overvoltage stall
suppression
5 Hz 0 Hz to 50 Hz
The running frequency may increase
when overvoltage stall suppression is
enabled. This parameter limits the rise
of the running frequency.
F3-10
V/f overexcitation gain
64 0 to 200
A larger overexcitation gain indicates
better suppression effect. When a
braking resistor, braking unit, or
energy feedback unit is used, set this
parameter to 0. Otherwise, overcurrent
may occur during operation.
F3-11
V/f oscillation
suppression gain
Model
dependent
0 to 100
A larger oscillation gain indicates
better suppression effect.
Note
Observe the following requirements when using the braking resistor or energy feedback unit.
● Set F3–10 (Overexcitation gain) to 0. Failure to comply may lead to overcurrent during operation.
● Set F3–23 (Overvoltage stall selection) to 0. Failure to comply may prolong the deceleration time.
4.4.4 Speed Loop
The speed loop PI parameters are divided into two groups: low speed and high speed. When the
running frequency is lower than switchover frequency 1 (F2-02), the speed loop PI is adjusted by F2-00
and F2-01. When the running frequency is higher than switchover frequency 2 (F2-05), the speed loop
PI is adjusted by F2-03 and F2-04. When the running frequency is between switchover frequency 1 and
switchover frequency 2, PI parameters are obtained from linear switchover between the two groups of
PI parameters, as shown in the following figure.
Figure 4-41 Speed loop PI parameters
By setting the proportional gain and integral time of the speed regulator, you can adjust the dynamic
response to speed changes in vector control.
Increasing the proportional gain or reducing the integral time can speed up dynamic response of the
speed loop. However, excessively large proportional gain or excessively short integral time may cause
system oscillation.
If the factory defaults cannot meet the requirements, make fine adjustments based on the default
values. Increase the proportional gain first to ensure that the system does not oscillate, and then
reduce the integral time to ensure that the system has quick response and small overshoot.
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