4-71
The S curve function for acceleration / deceleration is used to reduce mechanical impact caused by the load
during momentary starting and stopping of the inverter. To use the S curve function set the time for
acceleration start point (11-04), acceleration end point (11-05), deceleration start point (11-06) and
deceleration end point (11-07).
S1
S2
S3
S4
ON
OFF
11-04
11-05 11-06
11-07
t
Output
Frequency
Run
Command
t
Note:
Independent of the stall prevention, actual acceleration and deceleration time preset acceleration divided
by deceleration time + S curve time.
To set S curve times use parameters (11-04~11-07).
When S curve time (11-04~11-07) is set as 0, the S curve function is disabled.
The calculation of S curve time is based on the Maximum output frequency of motor (01-02), Please refer to
the parameters (00-14/00-15/00-16/00-17).
Skip frequency range. (± frequency band)
These parameters allow “skipping over” of certain frequencies that can cause unstable operation due to
resonance within certain applications.
Note: Prohibit any operation within the skip frequency range. During acceleration and deceleration the frequency
is continuous without skipping the jump frequency.
To enable skip frequency 1 – 3 (11-08 – 11-10) set the frequency to a value greater than 0.0 Hz.