5.2 Motor Performance Fine-Tuning
142 YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
u Fine-Tuning Closed Loop Vector Control
Table 5.3 Parameters for Fine-Tuning the Performance in CLV
u Parameters to Minimize Motor Hunting and Oscillation
In addition to the parameters discussed on page Table 5. 4 and Table 5. 5, the following parameters indirectly affect motor
hunting and oscillation.
Table 5.4 Parameters that Affect Control Performance in Applications
Problem Parameter No. Corrective Action Default
Suggested
Setting
• Poor motor torque and
speed response
• Motor hunting and
oscillation
<1> For more information about Speed Control (ASR), refer to the description of the Speed Control (C5-) parameters in the separate
FSDrive-MV1000 Parameter Guide (TOEP C710687 03).
<High speed side>
ASR Proportional Gain 1
(C5-01)
<Low speed side>
ASR Proportional Gain 2
(C5-03)
<1>
• Gradually increase the setting in increments of 5 if motor
torque and speed response are too slow.
• Reduce the setting if motor hunting and oscillation occur.
5.00 5.00 to 30.00
• Poor motor torque and
speed response
• Motor hunting and
oscillation
<High speed side>
ASR Integral Time 1
(C5-02)
<Low speed side>
ASR Integral Time 2
(C5-04)
<1>
• Reduce the setting if motor torque and speed response
are too slow.
• Increase the setting if motor hunting and oscillation
occur.
5.000 s
0.300 to
5.000 s
Difficulty maintaining the
ASR proportional gain or the
integral time at the low or
high end of the speed range
ASR Gain Switching
Frequency (C5-07)
<1>
Switch the drive between two different ASR proportional
gain and integral time settings based on the output
frequency.
0.0 Hz
0.0 to max
output
frequency
Motor hunting and
oscillation
ASR Primary Delay Time
Constant (C5-06) <1>
• Gradually reduce the setting in 0.01 increments if motor
torque and speed response are too slow.
• Increase the setting if the load is less rigid and subject to
oscillation.
0.012 s
0.004 to
0.060 s
Parameter No. Application
Dwell Function
(b6-01 through b6-04)
Prevents motor speed loss by maintaining the output frequency when working with heavy loads or when there
is powerful backlash on the machine side.
Droop Function
(b7-01, b7-03)
Moderates motor torque and balances the load level between two motors.
(Enabled when Control Mode A1-02 = 3)
Accel/Decel Time
(C1-01 through C1-11)
Adjusting accel and decel times will affect the torque presented to the motor during acceleration or
deceleration.
S-Curve Characteristics
(C2-01 to C2-04)
Prevents shock at the beginning and end of acceleration and deceleration.
Jump Frequency
(d3-01 through d3-04)
Skips over the resonant frequencies of connected machinery.
Analog Input Filter Time
Constant
(H3-13)
Prevents fluctuation in analog input signals due to noise.
Stall Prevention
(L3-01 through L3-06, L3-11,
L3-23, L3-27)
• Prevents motor speed loss and overvoltage when the load is too heavy or during sudden acceleration/
deceleration.
• Adjustment is not normally necessary because Stall Prevention is enabled as a default.
Torque Limits
(L7-01 through L7-04, L7-06,
L7-07, L7-16)
• Set the maximum torque for Open Loop Vector Control.
• Ensure that the drive capacity is greater than the motor capacity when increasing this setting. Be careful
when reducing this value because motor speed loss may occur with heavy loads.
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