C4 User Manual
Page 102 ©2021 Smartrise Engineering, Inc. All Rights Reserved October 25, 2021
3. From the PROFILE menu, scroll and select Accel Jerk In.
Figure 130: NORMAL PROFILE MENUS – Accel Jerk In
4. From the JERK IN ACCELERATION menu, select the rate of transition from minimum
acceleration speed to full acceleration.
Figure 131: JERK IN ACCEL Menu
5. Scroll right and press Save.
9.1.1.3 Accel Jerk Out
The Acceleration Jerk Out parameter determines how quickly the profile transitions from
maximum to zero acceleration (constant velocity). As Accel Jerk Out increases, the profile
transitions more quickly. Lower values provide greater comfort. Larger values result in a greater
gravitational force felt in the car when attaining maximum speed. With larger jerk values, the
pattern also spends less time in rounding and reaches constant speed sooner resulting in higher
achieved speeds up to contract speed.
The adjustment range is from 0.3-25 fps
3
.
• Default = 2 fps
3
• Units of measure = fps
3
The exact amount of time spent in rounding depends on the acceleration rate. The time is
acceleration ÷ jerk out and should normally be 0.6 to 1.3 seconds. You can easily set a one
second rounding time by setting the jerk numerically equal to the acceleration. If the
acceleration is 2 fps
2
, accel jerk out value of 2 fps
3
will give one second of rounding. Rounding
should never take more than one half of the total time to reach constant speed.
The following procedure describes how to set Accel Jerk Out.
1. Navigate to MAIN MENU | SETUP | S-CURVE. See Figure 55.
2. From the S-CURVE menu, scroll and select the profile that is being adjusted. See Figure
127.
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