Parameter Description MD280/MD280N User Manual
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1˖S-curve speed-up/speed-down A
The output frequency increases or decreases along the straight line. S
curve is generally used in the applications where start and stop processes
are relatively flat, such as elevator and conveyor belt.As shown in
Fig.6 .The speed-up/speed-down time is consistent with the straight
speed-up/speed-down time.Function code of F4-08 and F4-09 can be
respectively defined the time proportion between the S-curve
starting-segment and finishing-segment for S-curve speed-up/speed-down
A.
2˖ S-curve speed-up/speed-down B
In the speed-up/speed-down curve, the motor rated frequency
b
is
always the point of inflexion on S-curve.As shown in 6-14. S curve is
generally used in the applications where the high-speed area above the
rated frequency and short-time speed-up/speed-down.
When setup frequency is above the rated frequency,
speed-up/speed-down time is:
2
45
(() )
99
b
f
tT
f
u u
.
Where,
Refers to setup frequency,
b
Refers to motor rated frequency,
T
Refers to the time speed-up from 0 to rated frequency
b
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