Notes on Tuning the MxC
4-15
Tuning Procedures
If the torque is approximately 12 Hz and insufficient, tune the MxC as follows.
Assuming that the torque is insufficient in a middle frequency, calculate the middle output voltage using the
following formula.
Settings must be within the following ranges:
VC: Middle frequency (E1-08)
FB: Middle output frequency (E1-07)
FA: Base frequency (E1-06)
Vmax: Maximum output voltage (E1-05)
K: 1.1 to 1.4
Open loop
vector
control
(A1-02 = 2)
Slip Compensation
Gain (C3-01)
• Improving speed
accuracy
1.0 0.5 to 1.5
• Increase the setting if
speed response is slow.
• Reduce the setting if the
speed is too fast.
Flux Vector
Control
(A1-02 = 3)
ASR Proportional
Gain 1 (C5-01) and
ASR Proportional
Gain 2 (C5-03)
• Torque and speed
response
• Controlling hunting
and oscillation
20.00
10.00 to
50.00
• Increase the setting if
torque or speed response is
slow.
• Reduce the setting if hunt-
ing or oscillation occurs.
ASR Integral Time 1
(C5-02) and
ASR Integral Time 2
(C5-04)
• Torque and speed
response
• Controlling hunting
and oscillation
0.500 s
0.300 to
1.000 s
• Reduce the setting if the
torque or speed response is
too slow.
• Increase the setting if hunt-
ing or oscillation occurs.
ASR Gain Switching
Frequency (C5-07)
Switching the ASR
proportional gain and
integral time accord-
ing to the output fre-
quency
0.0 Hz
0.0 to max
output fre-
quency
Set the output frequency at
which to change the ASR
proportional gain and inte-
gral time when the same val-
ues cannot be used for both
high-speed and low-speed
operation.
ASR Primary Delay
Time Constant
(C5-06)
• Controlling hunting
and oscillation
0.004 s
0.004 to
0.020 s
Increase the setting if
machine rigidity is low and
the system vibrates easily.
Table 4.3 Adjusted Parameters (Continued)
Control
Method
Parameters Performance Default
Recom-
mended
Setting
Adjustment Method
Output Voltage (V)
Frequency (Hz)
VMAX
(E1-05)
VC
(E1-08)
VMIN
(E1-10)
FMIN
(E1-09)
FB
(E1-07)
FA
(E1-06)
FMAX
(E1-04)
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