Table of Contents
Parameter
S-pattern acceleration/deceleration A (Pr. 29 = 1)
Used when acceleration/deceleration must be made in a short time to a high-speed range of not
lower than base frequency. In this acceleration/deceleration pattern, Pr. 3 "Base frequency" (fb)
is the inflection point of the S-pattern (refer to Fig. 6-31) and you can set the acceleration/de-
celeration time appropriate for motor torque reduction in a constant-output operation region of
base frequency or higher. For machine tool spindle applications, etc.
Hz
fm
S-pattern acceleration/deceleration B (Pr. 29 = 2)
When a setting of "2" is entered frequency changes are executed with an S-pattern. For
example, if a drive is accelerated from 0 to 30Hz and then re-accelerated to 50Hz then each
acceleration sequence (i.e. the first sequence from 0 to 30Hz and the second from 30Hz to
50Hz) will be executed with an S-pattern. The time for the S-pattern is not longer than that for
linear acceleration (refer to Fig. 6-32). This prevents jolts in drive operation, for example for
conveyor belt and positioning drive systems.
f1
f2
NOTE
As the acceleration/deceleration time of S-pattern acceleration/deceleration A, set the time
taken until Pr. 3 "Base frequency" is reached, not Pr. 20 "Acceleration/deceleration reference
frequency".
FR-D700 SC EC
S-pattern acceleration/
deceleration A
Time
S-pattern acceleration/
deceleration B
Time
Fig. 6-31:
Characteristic for parameter 29 = 1
t
Fig. 6-32:
Characteristic for parameter 29 = 2
t
Acceleration and deceleration
I000016C
I000017C
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