Acceleration and Deceleration Characteristics6- 33Setting ExampleAn example of stall prevention during deceleration when L3-04 is set to 1 as shown below.Fig 6.27 Stall Prevention During Deceleration OperationSetting Precautions• The stall prevention level during deceleration differs depending on the Inverter capacity. Refer to the fol-lowing table for details.• When using the braking option (braking resistor, Braking Resistor Units, and Braking Units), be sure to setconstant L3-04 to 0 or 3.• To decelerate at a shorter time than the deceleration time set when L3-04 is set to 0 with the braking optionenabled, set L3-04 to 3.• Preventing Overvoltage by Automatically Reducing the RegenerativeTorque Limit (Overvoltage Inhibit Function, SPEC: E or later only)The overvoltage inhibit function is a function that, by reducing the regenerative torque limit to a value lessthan its set value according to the main circuit voltage level, suppresses voltage rises with regenerative torque.Using this function means that if, for example, the main circuit voltage rises during deceleration, the regener-ative torque limit will be reduced and so the deceleration rate will be reduced automatically, suppressing risesin the main circuit voltage.This function is effective for suppressing overvoltages that occur during stabilization after an overshoot fol-lowing sudden acceleration. This function differs from the stall prevention during deceleration function in thisrespect.This function is enabled during vector control.Inverter Capacity Stall Prevention Level during Deceleration (V)200 V Class 380400 V Class E1-01 ≥ 400 V 760E1-01 < 400 V 660Deceleration time controlled toprevent overvoltageDeceleration time(set value)TimeOutput frequencyThe setting of L3-04 is ignored for flux vector control.
