5.2 Motor Performance Fine Tuning180 YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual◆ Motor Hunting and Oscillation Control ParametersIn addition to the parameters discussed in V/f Pattern Selection: E1-03 on page 139, thefollowing parameters indirectly affect motor hunting and oscillation.Table 5.3 Parameters that Affect Control Performance in ApplicationsName (Parameter No.) ApplicationDwell Function(b6-01 through b6-04)Prevents motor speed loss by maintaining the output frequency when workingwith heavy loads or when there is powerful backlash on the machine side.Accel/Decel Time(C1-01 through C1-11)Adjusting accel and decel times will affect the torque presented to the motorduring 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 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 andalso during sudden acceleration/deceleration.• Adjustment is not normally required because Stall Prevention is enabled as adefault. Disable Stall Prevention during deceleration (L3-04 = “0”) when using abraking 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 increasingthis setting. Be careful when reducing this value because motor speed loss mayoccur with heavy loads.
