Making Adjustments
4-
9
Making Adjustments
If problems such as hunting and vibration caused by control performance occur during trial operation,
change the settings of the constants listed below according to the selected control method. The table
below lists only the most commonly used constants.
Table 4.3 Constants to be Adjusted
Control
Method
Name
(Constant No.)
Functions
Factory
Setting
Recommended
Setting
Adjustment Method
Open-loop
vector control
(A1-02 = 2)
Speed feedback detec-
tion control (AFR) gain
(n2-01)
• Improves torque and
speed response.
• Reduces hunting and
vibration at middle-
speed (10 to 40 Hz)
2.00
0.50 to 2.00
• If torque or speed response
is slow, reduce the setting.
• If hunting or vibration
occurs, increase the setting.
Torque
Compensation primary
delay time constant
(C4-02)
• Improves torque and
speed response.
• Reduces hunting and
vibration
50
20 to 100 ms
• If torque or speed response
is slow, reduce the setting.
• If hunting or vibration
occurs, increase the setting.
Slip compensation pri-
mary delay time con-
stant
(C3-02)
• Improves speed
response.
• Increases speed sta-
bility
3000
100 to 5000 ms
• If speed response is slow,
reduce the setting.
• If speed is unstable, increase
the setting.
Slip compensation gain
(C3-01)
• Improves speed
accuracy.
1.0
0.5 to 1.5
• If speed is too low, increase
the setting.
• If speed is too high, decrease
the setting.
Flux vector
control
(A1-02=3)
Speed control
(ASR) proportional
gain 1
(C5-01)
Speed control
(ASR) proportional
gain
(C5-03)
• Improves torque and
speed response.
• Reduces hunting and
vibration
5.00
2.00 to 15.00
• If torque or speed response
is slow, increase the setting.
• If hunting or vibration
occurs, decrease the setting.
Speed control
(ASR) integral time 1
(High-speed)
(C5-02)
Speed control
(ASR) integral time 2
(Low-speed)
(C5-04)
• Improves torque and
speed response
• Reduces hunting and
vibration
5.000 s
1.000 to 10.000 s
• If torque or speed response
is slow, decrease the setting.
• If hunting or vibration
occurs, increase the setting.
Speed control
(ASR) gain switching
frequency
(C5-07)
Switches the ASR pro-
portional gain and inte-
gral time according to
the output frequency.
0.0 Hz
0.0 to maximum
output frequency
Set the output frequency so
that the ASR proportional gain
and integral time can be
secured at both low and high
speeds.
