Function Application
‑577‑
Note
Improper PI parameter settings may lead to a high overshoot. Even worse, overvoltage may
occur when overshoot drops.
Increasing the value of F2‑07 can improve motor stability, but slows down dynamic
response. Reducing the value of F2‑07 can speed up dynamic response, but may
cause motor oscillation. The default settings are applicable in most cases.
Para.
Function
Default Value Range
Description
F2‑00 Low‑
speed
speed
loop Kp
30 1 to 200
This is the PID control parameter Kp for
the speed loop, which affects the
response speed of the motor speed. A
larger Kp value indicates higher sensitivity
and more intensive tuning. A smaller Kp
value indicates lower sensitivity and less
intensive tuning. The low‑speed speed
loop Kp is effective at low speed.
F2‑01 Low‑
speed
speed
loop Ti
0.500s 0.001s to
10.000s
The reciprocal of the speed loop integral
time constant is the integral gain. The
speed loop integral time constant affects
the steady‑state speed error of the motor
and the stability of the speed loop system.
If the speed loop integral time constant
increases, the speed loop response slows
down. For quicker response, a larger
speed loop proportional gain is required.
The low‑speed speed loop Ti is effective at
low speed.
F2‑02
Switch
over
frequency
1
5.00 Hz 0.00 to F2‑05
Speed loop PI parameters are divided into
low‑speed and high‑speed groups. If the
running frequency is lower than
switchover frequency 1 (F2‑02), the speed
loop PI parameters are adjusted by F2‑00
and F2‑01. If the running frequency is
higher than switchover frequency 2 (F2‑
05), the speed loop PI parameters are
adjusted by F2‑03 and F3‑04. If the
running frequency is between switchover
frequency 1 and switchover frequency 2,
the speed loop PI parameters switch
linearly between the two groups of PI
parameters. This parameter must be set
to a value lower than switchover
frequency 2 (F2‑05).
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