6.2 Motor Performance Fine Tuning
238 YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
◆ Motor Hunting and Oscillation Control Parameters
In addition to the parameters discussed on page 147, the following parameters indirectly affect motor hunting and
oscillation.
Table 6.3 Parameters that Affect Control Performance in Applications
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.
Accel/Decel Time (C1-01 through C1-09)
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.
Analog Filter Time Constant (H3-13) Prevents fluctuation in the analog input signal due to noise.
Stall Prevention (L3-01 through L3-06, L3-
11)
• Prevents motor speed loss and overvoltage. 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. Disable
Stall Prevention during deceleration (L3-04 = “0”) when using a braking resistor.
Torque Limits (L7-01 through L7-04, L7-
06, L7-07)
• Sets 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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