Adjustment Parameter Name C1-01, C1-03, C1-05, C1-07 Acceleration Time 1 to 4 C1-02, C1-04, C1-06, C1-08 Deceleration Time 1 to 4 C2-01 S-Curve Time @ Start of Accel C2-02 S-Curve Time @ End of Accel C2-03 S-Curve Time @ Start of Decel C2-04 S-Curve Time @ End of Decel Figure 1. S-curve Characteristics, Accel & Decel Time Note: When decreased operation times are necessary for the application, for example with cranes and hoists, do not use S-curve characteristic times. The default setting for C2-04 [S-Curve Time @ End of Decel] will be 0.00 seconds. The default setting for other S-curve characteristics will be 0.20 seconds. Set the acceleration/deceleration times and S-curve characteristic time correctly for acceleration/deceleration start up and end. The recommended setting of the S-curve characteristics time is 0.2 to 1.0 seconds. When you use the C1-11 [Accel/Decel Time Switchover Freq], you can switch the acceleration/deceleration rate automatically during acceleration/deceleration. The default setting is disabled. When the Output Frequency ≥ C1-11, operate at the acceleration and deceleration times set in C1-01 and C1-02 When the Output Frequency < C1-11, operate at the acceleration and deceleration times set in C1-07 and C1-08 During low speed operation, if the Output Frequency < E1-09 [Minimum Output Frequency] in the S-Curve Time @ Start of Decel, the drive will cancel the S-curve characteristics and will do DC Inject Braking at Stop (zero speed control).