Parameters To Minimize Motor Hunting And Oscillation - YASKAWA U1000 Series Technical Manual

Problem
Oscillation at constant output when
U6-02 displays -10% or more.
<1> Optimal settings will differ between no-load and loaded operation.

◆ Parameters to Minimize Motor Hunting and Oscillation

In addition to the parameters discussed on page
and oscillation.
Table 6.7 Parameters that Affect Control Performance in Applications
Name (Parameter No.)
Dwell Function (b6-01 through b6-04)
Droop Function (b7-01, b7-02)
Accel/Decel Time (C1-01 through C1-11)
S-Curve Characteristics (C2-01 through C2-04)
Jump Frequency (d3-01 through d3-04)
Analog Input Filter Time Constant (H3-13)
Stall Prevention (L3-01 through L3-06)
Torque Limits (L7-01 through L7-04, L7-06, L7-07)
Feed Forward Control (n5-01 through n5-03)
YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Parameter No.
Output Voltage Limit
Decrease the output voltage limit proportional gain (n8-63).
Proportional Gain (for PM
Note: If the setting is too low, the speed response will be slow.
Motors) (n8-63)
344 through 346, parameters in
Prevents motor speed loss by maintaining the output frequency when working with heavy loads or when there is powerful
backlash on the machine side.
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.
Adjusting accel and decel times will affect the torque presented to the motor during acceleration or deceleration.
Prevents shock at the beginning and end of acceleration and deceleration.
Skips over the resonant frequencies of connected machinery.
Prevents fluctuation in the analog input signal due to noise.
• 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.
• 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.
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.
6.2 Motor Performance Fine-Tuning
Corrective Action
Table 6.7 indirectly affect motor hunting
Application
Suggested
Default
Setting
0.10 to 1.00
1.00 Decrease in
decrements of 0.1
6
347