6.2 Motor Performance Fine-Tuning
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
347
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Parameters to Minimize Motor Hunting and Oscillation
In addition to the parameters discussed on page
through
indirectly affect motor hunting
and oscillation.
Table 6.7 Parameters that Affect Control Performance in Applications
Oscillation at constant output when
U6-02 displays -10% or more.
Output Voltage Limit
Proportional Gain (for PM
Motors) (n8-63)
Decrease the output voltage limit proportional gain (n8-63).
Note:
If the setting is too low, the speed response will be slow.
1.00
0.10 to 1.00
Decrease in
decrements of 0.1
<1> Optimal settings will differ between no-load and loaded operation.
Name (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, b7-02)
Used to balance the load between two motors that drive the same load. Can be used when the control method (A1-02) is set to
3 or 7.
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 through 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 the analog input signal due to noise.
Stall Prevention (L3-01 through L3-06)
• Prevents motor speed loss. Used when the load is too heavy and also during sudden acceleration/deceleration.
• Adjustment is not normally required because Stall Prevention is enabled as a default.
Torque Limits (L7-01 through L7-04, L7-06, L7-07)
• Sets the maximum torque for Open Loop Vector Control.
• When increasing setting values, select the drive based on calculations from the motor rated torque. Motor speed loss may
occur with heavy loads.
Feed Forward Control (n5-01 through n5-03)
Used to increase response for acceleration/deceleration or to reduce overshooting when there is low machine rigidity and the
gain of the speed controller (ASR) cannot be increased. The inertia ratio between the load and motor and the acceleration time
of the motor running alone must be set.
Problem
Parameter No.
Corrective Action
Default
Suggested
Setting
SIEP_C710636_02B_1_0.book 347 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
