Inovance MD280NT2.2GB - Page 126

MD280 User Manual Description of Function Codes
- 125 -
It is used to set the frequency change mode during the AC drive start and stop process.
 0: Linear acceleration/deceleration
The output frequency increases or decreases in linear mode. The MD280 provides two
group of acceleration/deceleration time, which can be selected by using F2-00 to F2-
04.
 1: S-curve acceleration/deceleration A
The output frequency increases or decreases along the S curve. This mode is generally
used in the applications where start and stop processes are relatively smooth, such as
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the start segment and the end segment.
 2: S-curve acceleration/deceleration B
In this curve, the rated motor frequency
b
f
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usually used in applications where acceleration/deceleration is required at the speed
higher than the rated frequency.
When the set frequency is higher than the rated frequency, the acceleration/
deceleration time is:
2
5
9
b
f
T
f
t
4
(
u(
)

9
)u
In the formula,
f
is the set frequency,
b
f
is the rated motor frequency and
T
is the
acceleration time from 0 Hz to
b
f
.
Function Code Parameter Name Setting Range Default
F4-08 Time proportion of S-curve start segment 0.0% to 100.0% 20.0%
F4-09 Time proportion of S-curve end segment 0.0% to 100.0% 20.0%
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end segment of S-curve acceleration/deceleration. They must satisfy the requirement: F4-08
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output frequency change gradually decreases to 0. Within the time between t1 and t2,
the slope of the output frequency change remains unchanged, that is, linear acceleration/
deceleration.
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