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Explanation of functions (parameters)
2
FUNCTIONS
2.3.14 Acceleration/deceleration pattern (Pr. 29 )
<Setting>
Set the acceleration/deceleration pattern.
Parameter Name
Factory
Setting
Setting
Range
Remarks
29
Acceleration/
deceleration pattern
0 0, 1, 2 Setting is enabled when Pr. 30 = "1".
Pr. 29
Setting
Function Description
0
Linear
acceleration/
deceleration
Acceleration is made to the set frequency linearly.
(Factory setting)
1
S-pattern
acceleration/
deceleration A (*)
For machine tool spindle applications, etc.
Used when acceleration/deceleration must be made in a short
time to a high-speed region of not lower than the base
frequency. Acceleration/deceleration is made in a pattern
where fb (base frequency) acts as the inflection point of an S
shape, and you can set the acceleration/deceleration time
which matches the motor torque reduction in the constant-
output operation region of not lower than the base frequency.
2
S-pattern
acceleration/
deceleration B
For prevention of load shifting in conveyor and other
applications. Since acceleration/deceleration is always made in
an S shape from f2 (current frequency) to f1 (target frequency),
this function eases shock produced at acceleration/
deceleration and is effective for load collapse prevention, etc.
CAUTION
* As the acceleration/deceleration time, set the time taken to reach the Pr. 3
"base frequency" value, not the Pr. 20 "acceleration/deceleration reference
frequency" value.
♦Related parameters♦
•
Base frequency (acceleration/deceleration time setting) setting ⇒ Pr. 3 "base frequency"
(refer to page 65)
• Pr. 20 "acceleration / deceleration reference frequency" ⇒ refer to page 67
• For setting of "1" (S-pattern acceleration/deceleration A)
⇒ Pr. 44 "second acceleration/deceleration time", Pr. 45 "second deceleration time" (refer to
page 67)
Output
frequency (Hz)
fb
Time
[S-pattern
acceleration/deceleration A]
Set value 1
f1
f2
Output
frequency (Hz)
[S-pattern
acceleration/deceleration B]
Set value 2
Time
Set value 0
Time
Output
frequency (Hz)
[Linear
acceleration/deceleration]