S-Shaped Ramps - Lenze i55AE125B Manual

7.8

S-shaped ramps

In order to reduce the jerk and to therefore prevent the drive components from damage, a
smoothing factor can be set for the acceleration/deceleration ramps.
Details
In the default setting, the motor is accelerated and decelerated with linear ramps since this is
the most used configuration. The setting of a smoothing factor causes S-shaped ramps. This
leads to a smoother starting and braking behaviour which, for instance, is used for sensitive
machine parts with backlash. It has to be observed here that the setting of a smoothing factor
causes longer acceleration and delay times (see the following diagrams).
Input signals
Frequency setpoint selection
Output signals
Output frequency
0x2DDD
0x291E:001 = 0 %
0x291E:001 = 50 %
0x291E:001 = 100 %
Parameter Name / value range / [default setting]
0x291E:001 S-Ramp characteristic: Smoothing factor
(P226.01) (S-ramp char.: Smoothing factor)
0.0 ... [0.0] ... 100.0 %
60 Hz
50 Hz
40 Hz
30 Hz
20 Hz
10 Hz
0 Hz
60 Hz
0x2916
50 Hz
40 Hz
30 Hz
20 Hz
10 Hz
0 Hz
0x2917
60 Hz
50 Hz
40 Hz
30 Hz
20 Hz
10 Hz
0 Hz
0x2917 + (50 % · 0x2917 )
60 Hz
50 Hz
40 Hz
30 Hz
20 Hz
10 Hz
0 Hz
0x2917 + (100 % · 0x2917 )
Info
Factor for S-rounding of the acceleration/deceleration ramps.
• With the setting "0.0", the S-rounding is deactivated and acceleration/
0x2918
0x2918 + (50 % · 0x2918 )
0x2918 + (100 % · 0x2918
deceleration with linear ramps is carried out.
Basic setting
S-shaped ramps
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